Release: 1.0.2 | Release Date: April 24, 2015

SQLAlchemy 1.0 Documentation

1.0 Changelog

1.0.3

no release date

orm

  • [orm] [bug] Fixed a regression regarding the MapperEvents.instrument_class() event where its invocation was moved to be after the class manager’s instrumentation of the class, which is the opposite of what the documentation for the event explicitly states. The rationale for the switch was due to Declarative taking the step of setting up the full “instrumentation manager” for a class before it was mapped for the purpose of the new @declared_attr features described in Improvements to declarative mixins, @declared_attr and related features, but the change was also made against the classical use of mapper() for consistency. However, SQLSoup relies upon the instrumentation event happening before any instrumentation under classical mapping. The behavior is reverted in the case of classical and declarative mapping, the latter implemented by using a simple memoization without using class manager.

    References: #3388

  • [orm] [bug] Fixed issue in new QueryEvents.before_compile() event where changes made to the Query object’s collection of entities to load within the event would render in the SQL, but would not be reflected during the loading process.

    References: #3387

1.0.2

Released: April 24, 2015

orm declarative

  • [bug] [orm] [declarative] Fixed regression regarding the declarative __declare_first__ and __declare_last__ accessors where these would no longer be called on the superclass of the declarative base.

    References: #3383

sql

  • [sql] [bug] Fixed a regression that was incorrectly fixed in 1.0.0b4 (hence becoming two regressions); reports that SELECT statements would GROUP BY a label name and fail was misconstrued that certain backends such as SQL Server should not be emitting ORDER BY or GROUP BY on a simple label name at all; when in fact, we had forgotten that 0.9 was already emitting ORDER BY on a simple label name for all backends, as described in Label constructs can now render as their name alone in an ORDER BY, even though 1.0 includes a rewrite of this logic as part of #2992. As far as emitting GROUP BY against a simple label, even Postgresql has cases where it will raise an error even though the label to group on should be apparent, so it is clear that GROUP BY should never be rendered in this way automatically.

    In 1.0.2, SQL Server, Firebird and others will again emit ORDER BY on a simple label name when passed a Label construct that is also present in the columns clause. Additionally, no backend will emit GROUP BY against the simple label name only when passed a Label construct.

    References: #3338, #3385

1.0.1

Released: April 23, 2015

orm

  • [orm] [bug] Fixed issue where a query of the form query(B).filter(B.a != A(id=7)) would render the NEVER_SET symbol, when given a transient object. For a persistent object, it would always use the persisted database value and not the currently set value. Assuming autoflush is turned on, this usually would not be apparent for persistent values, as any pending changes would be flushed first in any case. However, this is inconsistent vs. the logic used for the non-negated comparison, query(B).filter(B.a == A(id=7)), which does use the current value and additionally allows comparisons to transient objects. The comparison now uses the current value and not the database-persisted value.

    Unlike the other NEVER_SET issues that are repaired as regressions caused by #3061 in this release, this particular issue is present at least as far back as 0.8 and possibly earlier, however it was discovered as a result of repairing the related NEVER_SET issues.

    References: #3374

  • [orm] [bug] Fixed a regression cause by #3061 where the NEVER_SET symbol could leak into relationship-oriented queries, including filter() and with_parent() queries. The None symbol is returned in all cases, however many of these queries have never been correctly supported in any case, and produce comparisons to NULL without using the IS operator. For this reason, a warning is also added to that subset of relationship queries that don’t currently provide for IS NULL.

    References: #3371

  • [orm] [bug] Fixed a regression caused by #3061 where the NEVER_SET symbol could leak into a lazyload query, subsequent to the flush of a pending object. This would occur typically for a many-to-one relationship that does not use a simple “get” strategy. The good news is that the fix improves efficiency vs. 0.9, because we can now skip the SELECT statement entirely when we detect NEVER_SET symbols present in the parameters; prior to #3061, we couldn’t discern if the None here were set or not.

    References: #3368

engine

  • [engine] [bug] Added the string value "none" to those accepted by the Pool.reset_on_return parameter as a synonym for None, so that string values can be used for all settings, allowing utilities like engine_from_config() to be usable without issue.

    This change is also backported to: 0.9.10

    References: #3375

sql

  • [sql] [bug] Fixed issue where a straight SELECT EXISTS query would fail to assign the proper result type of Boolean to the result mapping, and instead would leak column types from within the query into the result map. This issue exists in 0.9 and earlier as well, however has less of an impact in those versions. In 1.0, due to #918 this becomes a regression in that we now rely upon the result mapping to be very accurate, else we can assign result-type processors to the wrong column. In all versions, this issue also has the effect that a simple EXISTS will not apply the Boolean type handler, leading to simple 1/0 values for backends without native boolean instead of True/False. The fix includes that an EXISTS columns argument will be anon-labeled like other column expressions; a similar fix is implemented for pure-boolean expressions like not_(True()).

    References: #3372

sqlite

  • [sqlite] [bug] Fixed a regression due to #3282, where due to the fact that we attempt to assume the availability of ALTER when creating/dropping schemas, in the case of SQLite we simply said to not worry about foreign keys at all, since ALTER is not available, when creating and dropping tables. This meant that the sorting of tables was basically skipped in the case of SQLite, and for the vast majority of SQLite use cases, this is not an issue.

    However, users who were doing DROPs on SQLite with tables that contained data and with referential integrity turned on would then experience errors, as the dependency sorting does matter in the case of DROP with enforced constraints, when those tables have data (SQLite will still happily let you create foreign keys to nonexistent tables and drop tables referring to existing ones with constraints enabled, as long as there’s no data being referenced).

    In order to maintain the new feature of #3282 while still allowing a SQLite DROP operation to maintain ordering, we now do the sort with full FKs taken under consideration, and if we encounter an unresolvable cycle, only then do we forego attempting to sort the tables; we instead emit a warning and go with the unsorted list. If an environment needs both ordered DROPs and has foreign key cycles, then the warning notes they will need to restore the use_alter flag to their ForeignKey and ForeignKeyConstraint objects so that just those objects will be omitted from the dependency sort.

    See also

    The use_alter flag on ForeignKeyConstraint is (usually) no longer needed - contains an updated note about SQLite.

    References: #3378

firebird

  • [firebird] [bug] Fixed a regression due to #3034 where limit/offset clauses were not properly interpreted by the Firebird dialect. Pull request courtesy effem-git.

    References: #3380, pull request github:168

  • [firebird] [bug] Fixed support for “literal_binds” mode when using limit/offset with Firebird, so that the values are again rendered inline when this is selected. Related to #3034.

    References: #3381

1.0.0

Released: April 16, 2015

orm

  • [orm] [feature] Added new argument Query.update.update_args which allows kw arguments such as mysql_limit to be passed to the underlying Update construct. Pull request courtesy Amir Sadoughi.

    References: pull request github:164

  • [orm] [bug] Identified an inconsistency when handling Query.join() to the same target more than once; it implicitly dedupes only in the case of a relationship join, and due to #3233, in 1.0 a join to the same table twice behaves differently than 0.9 in that it no longer erroneously aliases. To help document this change, the verbiage regarding #3233 in the migration notes has been generalized, and a warning has been added when Query.join() is called against the same target relationship more than once.

    References: #3367

  • [orm] [bug] Made a small improvement to the heuristics of relationship when determining remote side with semi-self-referential (e.g. two joined inh subclasses referring to each other), non-simple join conditions such that the parententity is taken into account and can reduce the need for using the remote() annotation; this can restore some cases that might have worked without the annotation prior to 0.9.4 via #2948.

    References: #3364

sql

  • [sql] [feature] The topological sorting used to sort Table objects and available via the MetaData.sorted_tables collection will now produce a deterministic ordering; that is, the same ordering each time given a set of tables with particular names and dependencies. This is to help with comparison of DDL scripts and other use cases. The tables are sent to the topological sort sorted by name, and the topological sort itself will process the incoming data in an ordered fashion. Pull request courtesy Sebastian Bank.

    References: #3084, pull request bitbucket:47

  • [sql] [bug] Fixed issue where a MetaData object that used a naming convention would not properly work with pickle. The attribute was skipped leading to inconsistencies and failures if the unpickled MetaData object were used to base additional tables from.

    This change is also backported to: 0.9.10

    References: #3362

postgresql

  • [postgresql] [bug] Fixed a long-standing bug where the Enum type as used with the psycopg2 dialect in conjunction with non-ascii values and native_enum=False would fail to decode return results properly. This stemmed from when the PG postgresql.ENUM type used to be a standalone type without a “non native” option.

    This change is also backported to: 0.9.10

    References: #3354

mssql

  • [mssql] [bug] Fixed a regression where the “last inserted id” mechanics would fail to store the correct value for MSSQL on an INSERT where the primary key value was present in the insert params before execution, as well as in the case where an INSERT from SELECT would state the target columns as column objects, instead of string keys.

    References: #3360

  • [mssql] [bug] Using the Binary constructor now present in pymssql rather than patching one in. Pull request courtesy Ramiro Morales.

    References: pull request github:166

misc

  • [bug] [tests] Fixed the pathing used when tests run; for sqla_nose.py and py.test, the ”./lib” prefix is again inserted at the head of sys.path but only if sys.flags.no_user_site isn’t set; this makes it act just like the way Python puts ”.” in the current path by default. For tox, we are setting the PYTHONNOUSERSITE flag now.

    References: #3356

1.0.0b5

Released: April 3, 2015

orm

  • [orm] [bug] Fixed bug where the state tracking within multiple, nested Session.begin_nested() operations would fail to propagate the “dirty” flag for an object that had been updated within the inner savepoint, such that if the enclosing savepoint were rolled back, the object would not be part of the state that was expired and therefore reverted to its database state.

    This change is also backported to: 0.9.10

    References: #3352

  • [orm] [bug] Query doesn’t support joins, subselects, or special FROM clauses when using the Query.update() or Query.delete() methods; instead of silently ignoring these fields if methods like Query.join() or Query.select_from() has been called, an error is raised. In 0.9.10 this only emits a warning.

    References: #3349

  • [orm] [bug] Added a list() call around a weak dictionary used within the commit phase of the session, which without it could cause a “dictionary changed size during iter” error if garbage collection interacted within the process. Change was introduced by #3139.

  • [orm] [bug] Fixed a bug related to “nested” inner join eager loading, which exists in 0.9 as well but is more of a regression in 1.0 due to #3008 which turns on “nested” by default, such that a joined eager load that travels across sibling paths from a common ancestor using innerjoin=True will correctly splice each “innerjoin” sibling into the appropriate part of the join, when a series of inner/outer joins are mixed together.

    References: #3347

sql

  • [sql] [bug] The warning emitted by the unicode type for a non-unicode type has been liberalized to warn for values that aren’t even string values, such as integers; previously, the updated warning system of 1.0 made use of string formatting operations which would raise an internal TypeError. While these cases should ideally raise totally, some backends like SQLite and MySQL do accept them and are potentially in use by legacy code, not to mention that they will always pass through if unicode conversion is turned off for the target backend.

    References: #3346

postgresql

  • [postgresql] [bug] Fixed bug where updated PG index reflection as a result of #3184 would cause index operations to fail on Postgresql versions 8.4 and earlier. The enhancements are now disabled when using an older version of Postgresql.

    References: #3343

1.0.0b4

Released: March 29, 2015

sql

  • [sql] [bug] Fixed bug in new “label resolution” feature of #2992 where a label that was anonymous, then labeled again with a name, would fail to be locatable via a textual label. This situation occurs naturally when a mapped column_property() is given an explicit label in a query.

    References: #3340

  • [sql] [bug] Fixed bug in new “label resolution” feature of #2992 where the string label placed in the order_by() or group_by() of a statement would place higher priority on the name as found inside the FROM clause instead of a more locally available name inside the columns clause.

    References: #3335

schema

  • [schema] [feature] The “auto-attach” feature of constraints such as UniqueConstraint and CheckConstraint has been further enhanced such that when the constraint is associated with non-table-bound Column objects, the constraint will set up event listeners with the columns themselves such that the constraint auto attaches at the same time the columns are associated with the table. This in particular helps in some edge cases in declarative but is also of general use.

    References: #3341

mysql

  • [mysql] [bug] [pymysql] Fixed unicode support for PyMySQL when using an “executemany” operation with unicode parameters. SQLAlchemy now passes both the statement as well as the bound parameters as unicode objects, as PyMySQL generally uses string interpolation internally to produce the final statement, and in the case of executemany does the “encode” step only on the final statement.

    This change is also backported to: 0.9.10

    References: #3337

mssql

  • [mssql] [bug] [sybase] [firebird] [oracle] Turned off the “simple order by” flag on the MSSQL, Oracle dialects; this is the flag that per #2992 causes an order by or group by an expression that’s also in the columns clause to be copied by label, even if referenced as the expression object. The behavior for MSSQL is now the old behavior that copies the whole expression in by default, as MSSQL can be picky on these particularly in GROUP BY expressions. The flag is also turned off defensively for the Firebird and Sybase dialects.

    Note

    this resolution was incorrect, please see version 1.0.2 for a rework of this resolution.

    References: #3338

1.0.0b3

Released: March 20, 2015

mysql

  • [mysql] [bug] Repaired the commit for issue #2771 which was inadvertently commented out.

    References: #2771

1.0.0b2

Released: March 20, 2015

orm

orm declarative

  • [orm] [declarative] [change] Loosened some restrictions that were added to @declared_attr objects, such that they were prevented from being called outside of the declarative process; this is related to the enhancements of #3150 which allow @declared_attr to return a value that is cached based on the current class as it’s being configured. The exception raise has been removed, and the behavior changed so that outside of the declarative process, the function decorated by @declared_attr is called every time just like a regular @property, without using any caching, as none is available at this stage.

    References: #3331

engine

  • [engine] [bug] The “auto close” for ResultProxy is now a “soft” close. That is, after exhausing all rows using the fetch methods, the DBAPI cursor is released as before and the object may be safely discarded, but the fetch methods may continue to be called for which they will return an end-of-result object (None for fetchone, empty list for fetchmany and fetchall). Only if ResultProxy.close() is called explicitly will these methods raise the “result is closed” error.

    References: #3329, #3330

mysql

  • [mysql] [bug] [py3k] Fixed the mysql.BIT type on Py3K which was not using the ord() function correctly. Pull request courtesy David Marin.

    This change is also backported to: 0.9.10

    References: #3333, pull request github:158

  • [mysql] [bug] Fixes to fully support using the 'utf8mb4' MySQL-specific charset with MySQL dialects, in particular MySQL-Python and PyMySQL. In addition, MySQL databases that report more unusual charsets such as ‘koi8u’ or ‘eucjpms’ will also work correctly. Pull request courtesy Thomas Grainger.

    References: #2771, pull request bitbucket:49

1.0.0b1

Released: March 13, 2015

Version 1.0.0b1 is the first release of the 1.0 series. Many changes described here are also present in the 0.9 and sometimes the 0.8 series as well. For changes that are specific to 1.0 with an emphasis on compatibility concerns, see What’s New in SQLAlchemy 1.0?.

general

  • [general] [feature] Structural memory use has been improved via much more significant use of __slots__ for many internal objects. This optimization is particularly geared towards the base memory size of large applications that have lots of tables and columns, and greatly reduces memory size for a variety of high-volume objects including event listening internals, comparator objects and parts of the ORM attribute and loader strategy system.

  • [general] [bug] The __module__ attribute is now set for all those SQL and ORM functions that are derived as “public factory” symbols, which should assist with documentation tools being able to report on the target module.

    References: #3218

orm

  • [orm] [feature] Added a new entry "entity" to the dictionaries returned by Query.column_descriptions. This refers to the primary ORM mapped class or aliased class that is referred to by the expression. Compared to the existing entry for "type", it will always be a mapped entity, even if extracted from a column expression, or None if the given expression is a pure core expression.

    This change is also backported to: 0.9.10

    References: #3320

  • [orm] [feature] Added new parameter Session.connection.execution_options which may be used to set up execution options on a Connection when it is first checked out, before the transaction has begun. This is used to set up options such as isolation level on the connection before the transaction starts.

    See also

    Setting Transaction Isolation Levels - new documentation section detailing best practices for setting transaction isolation with sessions.

    This change is also backported to: 0.9.9

    References: #3296

  • [orm] [feature] Added new method Session.invalidate(), functions similarly to Session.close(), except also calls Connection.invalidate() on all connections, guaranteeing that they will not be returned to the connection pool. This is useful in situations e.g. dealing with gevent timeouts when it is not safe to use the connection further, even for rollbacks.

    This change is also backported to: 0.9.9

  • [orm] [feature] The “primaryjoin” model has been stretched a bit further to allow a join condition that is strictly from a single column to itself, translated through some kind of SQL function or expression. This is kind of experimental, but the first proof of concept is a “materialized path” join condition where a path string is compared to itself using “like”. The ColumnOperators.like() operator has also been added to the list of valid operators to use in a primaryjoin condition.

    This change is also backported to: 0.9.5

    References: #3029

  • [orm] [feature] Added new utility function make_transient_to_detached() which can be used to manufacture objects that behave as though they were loaded from a session, then detached. Attributes that aren’t present are marked as expired, and the object can be added to a Session where it will act like a persistent one.

    This change is also backported to: 0.9.5

    References: #3017

  • [orm] [feature] Added a new event suite QueryEvents. The QueryEvents.before_compile() event allows the creation of functions which may place additional modifications to Query objects before the construction of the SELECT statement. It is hoped that this event be made much more useful via the advent of a new inspection system that will allow for detailed modifications to be made against Query objects in an automated fashion.

    See also

    QueryEvents

    References: #3317

  • [orm] [feature] The subquery wrapping which occurs when joined eager loading is used with a one-to-many query that also features LIMIT, OFFSET, or DISTINCT has been disabled in the case of a one-to-one relationship, that is a one-to-many with relationship.uselist set to False. This will produce more efficient queries in these cases.

    References: #3249

  • [orm] [feature] Mapped state internals have been reworked to allow for a 50% reduction in callcounts specific to the “expiration” of objects, as in the “auto expire” feature of Session.commit() and for Session.expire_all(), as well as in the “cleanup” step which occurs when object states are garbage collected.

    References: #3307

  • [orm] [feature] A warning is emitted when the same polymorphic identity is assigned to two different mappers in the same hierarchy. This is typically a user error and means that the two different mapping types cannot be correctly distinguished at load time. Pull request courtesy Sebastian Bank.

    References: #3262, pull request bitbucket:38

  • [orm] [feature] A new series of Session methods which provide hooks directly into the unit of work’s facility for emitting INSERT and UPDATE statements has been created. When used correctly, this expert-oriented system can allow ORM-mappings to be used to generate bulk insert and update statements batched into executemany groups, allowing the statements to proceed at speeds that rival direct use of the Core.

    See also

    Bulk Operations

    References: #3100

  • [orm] [feature] Added a parameter Query.join.isouter which is synonymous with calling Query.outerjoin(); this flag is to provide a more consistent interface compared to Core FromClause.join(). Pull request courtesy Jonathan Vanasco.

    References: #3217

  • [orm] [feature] Added new event handlers AttributeEvents.init_collection() and AttributeEvents.dispose_collection(), which track when a collection is first associated with an instance and when it is replaced. These handlers supersede the collection.linker() annotation. The old hook remains supported through an event adapter.

  • [orm] [feature] The Query will raise an exception when Query.yield_per() is used with mappings or options where either subquery eager loading, or joined eager loading with collections, would take place. These loading strategies are not currently compatible with yield_per, so by raising this error, the method is safer to use. Eager loads can be disabled with the lazyload('*') option or Query.enable_eagerloads().

  • [orm] [feature] A new implementation for KeyedTuple used by the Query object offers dramatic speed improvements when fetching large numbers of column-oriented rows.

    References: #3176

  • [orm] [feature] The behavior of joinedload.innerjoin as well as relationship.innerjoin is now to use “nested” inner joins, that is, right-nested, as the default behavior when an inner join joined eager load is chained to an outer join eager load.

    References: #3008

  • [orm] [feature] UPDATE statements can now be batched within an ORM flush into more performant executemany() call, similarly to how INSERT statements can be batched; this will be invoked within flush to the degree that subsequent UPDATE statements for the same mapping and table involve the identical columns within the VALUES clause, that no SET-level SQL expressions are embedded, and that the versioning requirements for the mapping are compatible with the backend dialect’s ability to return a correct rowcount for an executemany operation.

  • [orm] [feature] The info parameter has been added to the constructor for SynonymProperty and ComparableProperty.

    References: #2963

  • [orm] [feature] The InspectionAttr.info collection is now moved down to InspectionAttr, where in addition to being available on all MapperProperty objects, it is also now available on hybrid properties, association proxies, when accessed via Mapper.all_orm_descriptors.

    References: #2971

  • [orm] [changed] The proc() callable passed to the create_row_processor() method of custom Bundle classes now accepts only a single “row” argument.

  • [orm] [changed] Deprecated event hooks removed: populate_instance, create_instance, translate_row, append_result

  • [orm] [bug] Fixed bugs in ORM object comparisons where comparison of many-to-one != None would fail if the source were an aliased class, or if the query needed to apply special aliasing to the expression due to aliased joins or polymorphic querying; also fixed bug in the case where comparing a many-to-one to an object state would fail if the query needed to apply special aliasing due to aliased joins or polymorphic querying.

    This change is also backported to: 0.9.9

    References: #3310

  • [orm] [bug] Fixed bug where internal assertion would fail in the case where an after_rollback() handler for a Session incorrectly adds state to that Session within the handler, and the task to warn and remove this state (established by #2389) attempts to proceed.

    This change is also backported to: 0.9.9

    References: #3309

  • [orm] [bug] Fixed bug where TypeError raised when Query.join() called with unknown kw arguments would raise its own TypeError due to broken formatting. Pull request courtesy Malthe Borch.

    This change is also backported to: 0.9.9

    References: pull request github:147

  • [orm] [bug] Fixed bug in lazy loading SQL construction whereby a complex primaryjoin that referred to the same “local” column multiple times in the “column that points to itself” style of self-referential join would not be substituted in all cases. The logic to determine substitutions here has been reworked to be more open-ended.

    This change is also backported to: 0.9.9

    References: #3300

  • [orm] [bug] The “wildcard” loader options, in particular the one set up by the orm.load_only() option to cover all attributes not explicitly mentioned, now takes into account the superclasses of a given entity, if that entity is mapped with inheritance mapping, so that attribute names within the superclasses are also omitted from the load. Additionally, the polymorphic discriminator column is unconditionally included in the list, just in the same way that primary key columns are, so that even with load_only() set up, polymorphic loading of subtypes continues to function correctly.

    This change is also backported to: 0.9.9

    References: #3287

  • [orm] [bug] [pypy] Fixed bug where if an exception were thrown at the start of a Query before it fetched results, particularly when row processors can’t be formed, the cursor would stay open with results pending and not actually be closed. This is typically only an issue on an interpreter like Pypy where the cursor isn’t immediately GC’ed, and can in some circumstances lead to transactions/ locks being open longer than is desirable.

    This change is also backported to: 0.9.9

    References: #3285

  • [orm] [bug] Fixed a leak which would occur in the unsupported and highly non-recommended use case of replacing a relationship on a fixed mapped class many times, referring to an arbitrarily growing number of target mappers. A warning is emitted when the old relationship is replaced, however if the mapping were already used for querying, the old relationship would still be referenced within some registries.

    This change is also backported to: 0.9.9

    References: #3251

  • [orm] [bug] [sqlite] Fixed bug regarding expression mutations which could express itself as a “Could not locate column” error when using Query to select from multiple, anonymous column entities when querying against SQLite, as a side effect of the “join rewriting” feature used by the SQLite dialect.

    This change is also backported to: 0.9.9

    References: #3241

  • [orm] [bug] Fixed bug where the ON clause for Query.join(), and Query.outerjoin() to a single-inheritance subclass using of_type() would not render the “single table criteria” in the ON clause if the from_joinpoint=True flag were set.

    This change is also backported to: 0.9.9

    References: #3232

  • [orm] [bug] [engine] Fixed bug that affected generally the same classes of event as that of #3199, when the named=True parameter would be used. Some events would fail to register, and others would not invoke the event arguments correctly, generally in the case of when an event was “wrapped” for adaption in some other way. The “named” mechanics have been rearranged to not interfere with the argument signature expected by internal wrapper functions.

    This change is also backported to: 0.9.8

    References: #3197

  • [orm] [bug] Fixed bug that affected many classes of event, particularly ORM events but also engine events, where the usual logic of “de duplicating” a redundant call to event.listen() with the same arguments would fail, for those events where the listener function is wrapped. An assertion would be hit within registry.py. This assertion has now been integrated into the deduplication check, with the added bonus of a simpler means of checking deduplication across the board.

    This change is also backported to: 0.9.8

    References: #3199

  • [orm] [bug] Fixed warning that would emit when a complex self-referential primaryjoin contained functions, while at the same time remote_side was specified; the warning would suggest setting “remote side”. It now only emits if remote_side isn’t present.

    This change is also backported to: 0.9.8

    References: #3194

  • [orm] [bug] [eagerloading] Fixed a regression caused by #2976 released in 0.9.4 where the “outer join” propagation along a chain of joined eager loads would incorrectly convert an “inner join” along a sibling join path into an outer join as well, when only descendant paths should be receiving the “outer join” propagation; additionally, fixed related issue where “nested” join propagation would take place inappropriately between two sibling join paths.

    This change is also backported to: 0.9.7

    References: #3131

  • [orm] [bug] Fixed a regression from 0.9.0 due to #2736 where the Query.select_from() method no longer set up the “from entity” of the Query object correctly, so that subsequent Query.filter_by() or Query.join() calls would fail to check the appropriate “from” entity when searching for attributes by string name.

    This change is also backported to: 0.9.7

    References: #2736, #3083

  • [orm] [bug] Fixed bug where items that were persisted, deleted, or had a primary key change within a savepoint block would not participate in being restored to their former state (not in session, in session, previous PK) after the outer transaction were rolled back.

    This change is also backported to: 0.9.7

    References: #3108

  • [orm] [bug] Fixed bug in subquery eager loading in conjunction with with_polymorphic(), the targeting of entities and columns in the subquery load has been made more accurate with respect to this type of entity and others.

    This change is also backported to: 0.9.7

    References: #3106

  • [orm] [bug] Additional checks have been added for the case where an inheriting mapper is implicitly combining one of its column-based attributes with that of the parent, where those columns normally don’t necessarily share the same value. This is an extension of an existing check that was added via #1892; however this new check emits only a warning, instead of an exception, to allow for applications that may be relying upon the existing behavior.

    This change is also backported to: 0.9.5

    References: #3042

  • [orm] [bug] Modified the behavior of orm.load_only() such that primary key columns are always added to the list of columns to be “undeferred”; otherwise, the ORM can’t load the row’s identity. Apparently, one can defer the mapped primary keys and the ORM will fail, that hasn’t been changed. But as load_only is essentially saying “defer all but X”, it’s more critical that PK cols not be part of this deferral.

    This change is also backported to: 0.9.5

    References: #3080

  • [orm] [bug] Fixed a few edge cases which arise in the so-called “row switch” scenario, where an INSERT/DELETE can be turned into an UPDATE. In this situation, a many-to-one relationship set to None, or in some cases a scalar attribute set to None, may not be detected as a net change in value, and therefore the UPDATE would not reset what was on the previous row. This is due to some as-yet unresovled side effects of the way attribute history works in terms of implicitly assuming None isn’t really a “change” for a previously un-set attribute. See also #3061.

    Note

    This change has been REVERTED in 0.9.6. The full fix will be in version 1.0 of SQLAlchemy.

    This change is also backported to: 0.9.5

    References: #3060

  • [orm] [bug] Related to #3060, an adjustment has been made to the unit of work such that loading for related many-to-one objects is slightly more aggressive, in the case of a graph of self-referential objects that are to be deleted; the load of related objects is to help determine the correct order for deletion if passive_deletes is not set.

    This change is also backported to: 0.9.5

  • [orm] [bug] Fixed bug in SQLite join rewriting where anonymized column names due to repeats would not correctly be rewritten in subqueries. This would affect SELECT queries with any kind of subquery + join.

    This change is also backported to: 0.9.5

    References: #3057

  • [orm] [bug] [sql] Fixes to the newly enhanced boolean coercion in #2804 where the new rules for “where” and “having” woudn’t take effect for the “whereclause” and “having” kw arguments of the select() construct, which is also what Query uses so wasn’t working in the ORM either.

    This change is also backported to: 0.9.5

    References: #3013

  • [orm] [bug] Fixed bug in subquery eager loading where a long chain of eager loads across a polymorphic-subclass boundary in conjunction with polymorphic loading would fail to locate the subclass-link in the chain, erroring out with a missing property name on an AliasedClass.

    This change is also backported to: 0.9.5, 0.8.7

    References: #3055

  • [orm] [bug] Fixed ORM bug where the class_mapper() function would mask AttributeErrors or KeyErrors that should raise during mapper configuration due to user errors. The catch for attribute/keyerror has been made more specific to not include the configuration step.

    This change is also backported to: 0.9.5, 0.8.7

    References: #3047

  • [orm] [bug] Fixed bug where the session attachment error “object is already attached to session X” would fail to prevent the object from also being attached to the new session, in the case that execution continued after the error raise occurred.

    References: #3301

  • [orm] [bug] The primary Mapper of a Query is now passed to the Session.get_bind() method when calling upon Query.count(), Query.update(), Query.delete(), as well as queries against mapped columns, column_property objects, and SQL functions and expressions derived from mapped columns. This allows sessions that rely upon either customized Session.get_bind() schemes or “bound” metadata to work in all relevant cases.

    References: #3242, #3227, #1326

  • [orm] [bug] The PropComparator.of_type() modifier has been improved in conjunction with loader directives such as joinedload() and contains_eager() such that if two PropComparator.of_type() modifiers of the same base type/path are encountered, they will be joined together into a single “polymorphic” entity, rather than replacing the entity of type A with the one of type B. E.g. a joinedload of A.b.of_type(BSub1)->BSub1.c combined with joinedload of A.b.of_type(BSub2)->BSub2.c will create a single joinedload of A.b.of_type((BSub1, BSub2)) -> BSub1.c, BSub2.c, without the need for the with_polymorphic to be explicit in the query.

    See also

    Eager Loading of Specific or Polymorphic Subtypes - contains an updated example illustrating the new format.

    References: #3256

  • [orm] [bug] Repaired support of the copy.deepcopy() call when used by the orm.util.CascadeOptions argument, which occurs if copy.deepcopy() is being used with relationship() (not an officially supported use case). Pull request courtesy duesenfranz.

    References: pull request github:137

  • [orm] [bug] Fixed bug where Session.expunge() would not fully detach the given object if the object had been subject to a delete operation that was flushed, but not committed. This would also affect related operations like make_transient().

    References: #3139

  • [orm] [bug] A warning is emitted in the case of multiple relationships that ultimately will populate a foreign key column in conflict with another, where the relationships are attempting to copy values from different source columns. This occurs in the case where composite foreign keys with overlapping columns are mapped to relationships that each refer to a different referenced column. A new documentation section illustrates the example as well as how to overcome the issue by specifying “foreign” columns specifically on a per-relationship basis.

    References: #3230

  • [orm] [bug] The Query.update() method will now convert string key names in the given dictionary of values into mapped attribute names against the mapped class being updated. Previously, string names were taken in directly and passed to the core update statement without any means to resolve against the mapped entity. Support for synonyms and hybrid attributes as the subject attributes of Query.update() are also supported.

    References: #3228

  • [orm] [bug] Improvements to the mechanism used by Session to locate “binds” (e.g. engines to use), such engines can be associated with mixin classes, concrete subclasses, as well as a wider variety of table metadata such as joined inheritance tables.

    References: #3035

  • [orm] [bug] Fixed bug in single table inheritance where a chain of joins that included the same single inh entity more than once (normally this should raise an error) could, in some cases depending on what was being joined “from”, implicitly alias the second case of the single inh entity, producing a query that “worked”. But as this implicit aliasing is not intended in the case of single table inheritance, it didn’t really “work” fully and was very misleading, since it wouldn’t always appear.

    References: #3233

  • [orm] [bug] The ON clause rendered when using Query.join(), Query.outerjoin(), or the standalone orm.join() / orm.outerjoin() functions to a single-inheritance subclass will now include the “single table criteria” in the ON clause even if the ON clause is otherwise hand-rolled; it is now added to the criteria using AND, the same way as if joining to a single-table target using relationship or similar.

    This is sort of in-between feature and bug.

    References: #3222

  • [orm] [bug] A major rework to the behavior of expression labels, most specifically when used with ColumnProperty constructs with custom SQL expressions and in conjunction with the “order by labels” logic first introduced in 0.9. Fixes include that an order_by(Entity.some_col_prop) will now make use of “order by label” rules even if Entity has been subject to aliasing, either via inheritance rendering or via the use of the aliased() construct; rendering of the same column property multiple times with aliasing (e.g. query(Entity.some_prop, entity_alias.some_prop)) will label each occurrence of the entity with a distinct label, and additionally “order by label” rules will work for both (e.g. order_by(Entity.some_prop, entity_alias.some_prop)). Additional issues that could prevent the “order by label” logic from working in 0.9, most notably that the state of a Label could change such that “order by label” would stop working depending on how things were called, has been fixed.

    References: #3148, #3188

  • [orm] [bug] Changed the approach by which the “single inheritance criterion” is applied, when using Query.from_self(), or its common user Query.count(). The criteria to limit rows to those with a certain type is now indicated on the inside subquery, not the outside one, so that even if the “type” column is not available in the columns clause, we can filter on it on the “inner” query.

    References: #3177

  • [orm] [bug] Made a small adjustment to the mechanics of lazy loading, such that it has less chance of interfering with a joinload() in the very rare circumstance that an object points to itself; in this scenario, the object refers to itself while loading its attributes which can cause a mixup between loaders. The use case of “object points to itself” is not fully supported, but the fix also removes some overhead so for now is part of testing.

    References: #3145

  • [orm] [bug] The “resurrect” ORM event has been removed. This event hook had no purpose since the old “mutable attribute” system was removed in 0.8.

    References: #3171

  • [orm] [bug] Fixed bug where attribute “set” events or columns with @validates would have events triggered within the flush process, when those columns were the targets of a “fetch and populate” operation, such as an autoincremented primary key, a Python side default, or a server-side default “eagerly” fetched via RETURNING.

    References: #3167

  • [orm] [bug] [py3k] The IdentityMap exposed from Session.identity_map now returns lists for items() and values() in Py3K. Early porting to Py3K here had these returning iterators, when they technically should be “iterable views”..for now, lists are OK.

  • [orm] [bug] The “evaluator” for query.update()/delete() won’t work with multi-table updates, and needs to be set to synchronize_session=False or synchronize_session=’fetch’; this now raises an exception, with a message to change the synchronize setting. This is upgraded from a warning emitted as of 0.9.7.

    References: #3117

  • [orm] [change] Mapped attributes marked as deferred without explicit undeferral will now remain “deferred” even if their column is otherwise present in the result set in some way. This is a performance enhancement in that an ORM load no longer spends time searching for each deferred column when the result set is obtained. However, for an application that has been relying upon this, an explicit undefer() or similar option should now be used.

  • [orm] [enhancement] Adjustment to attribute mechanics concerning when a value is implicitly initialized to None via first access; this action, which has always resulted in a population of the attribute, no longer does so; the None value is returned but the underlying attribute receives no set event. This is consistent with how collections work and allows attribute mechanics to behave more consistently; in particular, getting an attribute with no value does not squash the event that should proceed if the value is actually set to None.

    where bound parameters are rendered inline as strings based on a compile-time option. Work on this feature is courtesy of Dobes Vandermeer.

    References: #3061

orm declarative

  • [feature] [orm] [declarative] The declared_attr construct has newly improved behaviors and features in conjunction with declarative. The decorated function will now have access to the final column copies present on the local mixin when invoked, and will also be invoked exactly once for each mapped class, the returned result being memoized. A new modifier declared_attr.cascading is added as well.

    References: #3150

  • [bug] [declarative] [orm] Fixed “‘NoneType’ object has no attribute ‘concrete’” error when using AbstractConcreteBase in conjunction with a subclass that declares __abstract__.

    This change is also backported to: 0.9.8

    References: #3185

  • [bug] [orm] [declarative] Fixed bug where using an __abstract__ mixin in the middle of a declarative inheritance hierarchy would prevent attributes and configuration being correctly propagated from the base class to the inheriting class.

    References: #3240, #3219

  • [bug] [orm] [declarative] A relationship set up with declared_attr on a AbstractConcreteBase base class will now be configured on the abstract base mapping automatically, in addition to being set up on descendant concrete classes as usual.

    References: #2670

engine

  • [engine] [feature] Added new user-space accessors for viewing transaction isolation levels; Connection.get_isolation_level(), Connection.default_isolation_level.

    This change is also backported to: 0.9.9

  • [engine] [feature] Added new event ConnectionEvents.handle_error(), a more fully featured and comprehensive replacement for ConnectionEvents.dbapi_error().

    This change is also backported to: 0.9.7

    References: #3076

  • [engine] [feature] A new style of warning can be emitted which will “filter” up to N occurrences of a parameterized string. This allows parameterized warnings that can refer to their arguments to be delivered a fixed number of times until allowing Python warning filters to squelch them, and prevents memory from growing unbounded within Python’s warning registries.

    References: #3178

  • [engine] [bug] Fixed bug in Connection and pool where the Connection.invalidate() method, or an invalidation due to a database disconnect, would fail if the isolation_level parameter had been used with Connection.execution_options(); the “finalizer” that resets the isolation level would be called on the no longer opened connection.

    This change is also backported to: 0.9.9

    References: #3302

  • [engine] [bug] A warning is emitted if the isolation_level parameter is used with Connection.execution_options() when a Transaction is in play; DBAPIs and/or SQLAlchemy dialects such as psycopg2, MySQLdb may implicitly rollback or commit the transaction, or not change the setting til next transaction, so this is never safe.

    This change is also backported to: 0.9.9

    References: #3296

  • [engine] [bug] The execution options passed to an Engine either via create_engine.execution_options or Engine.update_execution_options() are not passed to the special Connection used to initialize the dialect within the “first connect” event; dialects will usually perform their own queries in this phase, and none of the current available options should be applied here. In particular, the “autocommit” option was causing an attempt to autocommit within this initial connect which would fail with an AttributeError due to the non-standard state of the Connection.

    This change is also backported to: 0.9.8

    References: #3200

  • [engine] [bug] The string keys that are used to determine the columns impacted for an INSERT or UPDATE are now sorted when they contribute towards the “compiled cache” cache key. These keys were previously not deterministically ordered, meaning the same statement could be cached multiple times on equivalent keys, costing both in terms of memory as well as performance.

    This change is also backported to: 0.9.8

    References: #3165

  • [engine] [bug] Fixed bug which would occur if a DBAPI exception occurs when the engine first connects and does its initial checks, and the exception is not a disconnect exception, yet the cursor raises an error when we try to close it. In this case the real exception would be quashed as we tried to log the cursor close exception via the connection pool and failed, as we were trying to access the pool’s logger in a way that is inappropriate in this very specific scenario.

    This change is also backported to: 0.9.5

    References: #3063

  • [engine] [bug] Fixed some “double invalidate” situations were detected where a connection invalidation could occur within an already critical section like a connection.close(); ultimately, these conditions are caused by the change in #2907, in that the “reset on return” feature calls out to the Connection/Transaction in order to handle it, where “disconnect detection” might be caught. However, it’s possible that the more recent change in #2985 made it more likely for this to be seen as the “connection invalidate” operation is much quicker, as the issue is more reproducible on 0.9.4 than 0.9.3.

    Checks are now added within any section that an invalidate might occur to halt further disallowed operations on the invalidated connection. This includes two fixes both at the engine level and at the pool level. While the issue was observed with highly concurrent gevent cases, it could in theory occur in any kind of scenario where a disconnect occurs within the connection close operation.

    This change is also backported to: 0.9.5

    References: #3043

  • [engine] [bug] The engine-level error handling and wrapping routines will now take effect in all engine connection use cases, including when user-custom connect routines are used via the create_engine.creator parameter, as well as when the Connection encounters a connection error on revalidation.

    References: #3266

  • [engine] [bug] Removing (or adding) an event listener at the same time that the event is being run itself, either from inside the listener or from a concurrent thread, now raises a RuntimeError, as the collection used is now an instance of colletions.deque() and does not support changes while being iterated. Previously, a plain Python list was used where removal from inside the event itself would produce silent failures.

    References: #3163

sql

  • [sql] [feature] Liberalized the contract for Index a bit in that you can specify a text() expression as the target; the index no longer needs to have a table-bound column present if the index is to be manually added to the table, either via inline declaration or via Table.append_constraint().

    This change is also backported to: 0.9.5

    References: #3028

  • [sql] [feature] Added new flag expression.between.symmetric, when set to True renders “BETWEEN SYMMETRIC”. Also added a new negation operator “notbetween_op”, which now allows an expression like ~col.between(x, y) to render as “col NOT BETWEEN x AND y”, rather than a parentheiszed NOT string.

    This change is also backported to: 0.9.5

    References: #2990

  • [sql] [feature] The SQL compiler now generates the mapping of expected columns such that they are matched to the received result set positionally, rather than by name. Originally, this was seen as a way to handle cases where we had columns returned with difficult-to-predict names, though in modern use that issue has been overcome by anonymous labeling. In this version, the approach basically reduces function call count per-result by a few dozen calls, or more for larger sets of result columns. The approach still degrades into a modern version of the old approach if any discrepancy in size exists between the compiled set of columns versus what was received, so there’s no issue for partially or fully textual compilation scenarios where these lists might not line up.

    References: #918

  • [sql] [feature] Literal values within a DefaultClause, which is invoked when using the Column.server_default parameter, will now be rendered using the “inline” compiler, so that they are rendered as-is, rather than as bound parameters.

    References: #3087

  • [sql] [feature] The type of expression is reported when an object passed to a SQL expression unit can’t be interpreted as a SQL fragment; pull request courtesy Ryan P. Kelly.

    References: pull request github:150

  • [sql] [feature] Added a new parameter Table.tometadata.name to the Table.tometadata() method. Similar to Table.tometadata.schema, this argument causes the newly copied Table to take on the new name instead of the existing one. An interesting capability this adds is that of copying a Table object to the same MetaData target with a new name. Pull request courtesy n.d. parker.

    References: pull request github:139

  • [sql] [feature] Exception messages have been spiffed up a bit. The SQL statement and parameters are not displayed if None, reducing confusion for error messages that weren’t related to a statement. The full module and classname for the DBAPI-level exception is displayed, making it clear that this is a wrapped DBAPI exception. The statement and parameters themselves are bounded within a bracketed sections to better isolate them from the error message and from each other.

    References: #3172

  • [sql] [feature] Insert.from_select() now includes Python and SQL-expression defaults if otherwise unspecified; the limitation where non- server column defaults aren’t included in an INSERT FROM SELECT is now lifted and these expressions are rendered as constants into the SELECT statement.

  • [sql] [feature] The UniqueConstraint construct is now included when reflecting a Table object, for databases where this is applicable. In order to achieve this with sufficient accuracy, MySQL and Postgresql now contain features that correct for the duplication of indexes and unique constraints when reflecting tables, indexes, and constraints. In the case of MySQL, there is not actually a “unique constraint” concept independent of a “unique index”, so for this backend UniqueConstraint continues to remain non-present for a reflected Table. For Postgresql, the query used to detect indexes against pg_index has been improved to check for the same construct in pg_constraint, and the implicitly constructed unique index is not included with a reflected Table.

    In both cases, the Inspector.get_indexes() and the Inspector.get_unique_constraints() methods return both constructs individually, but include a new token duplicates_constraint in the case of Postgresql or duplicates_index in the case of MySQL to indicate when this condition is detected. Pull request courtesy Johannes Erdfelt.

    References: #3184, pull request bitbucket:30

  • [sql] [feature] Added new method Select.with_statement_hint() and ORM method Query.with_statement_hint() to support statement-level hints that are not specific to a table.

    References: #3206

  • [sql] [feature] The info parameter has been added as a constructor argument to all schema constructs including MetaData, Index, ForeignKey, ForeignKeyConstraint, UniqueConstraint, PrimaryKeyConstraint, CheckConstraint.

    References: #2963

  • [sql] [feature] The Table.autoload_with flag now implies that Table.autoload should be True. Pull request courtesy Malik Diarra.

    References: #3027

  • [sql] [feature] The Select.limit() and Select.offset() methods now accept any SQL expression, in addition to integer values, as arguments. Typically this is used to allow a bound parameter to be passed, which can be substituted with a value later thus allowing Python-side caching of the SQL query. The implementation here is fully backwards compatible with existing third party dialects, however those dialects which implement special LIMIT/OFFSET systems will need modification in order to take advantage of the new capabilities. Limit and offset also support “literal_binds” mode,

    References: #3034

  • [sql] [changed] The column() and table() constructs are now importable from the “from sqlalchemy” namespace, just like every other Core construct.

  • [sql] [changed] The implicit conversion of strings to text() constructs when passed to most builder methods of select() as well as Query now emits a warning with just the plain string sent. The textual conversion still proceeds normally, however. The only method that accepts a string without a warning are the “label reference” methods like order_by(), group_by(); these functions will now at compile time attempt to resolve a single string argument to a column or label expression present in the selectable; if none is located, the expression still renders, but you get the warning again. The rationale here is that the implicit conversion from string to text is more unexpected than not these days, and it is better that the user send more direction to the Core / ORM when passing a raw string as to what direction should be taken. Core/ORM tutorials have been updated to go more in depth as to how text is handled.

    References: #2992

  • [sql] [bug] Added the native_enum flag to the __repr__() output of Enum, which is mostly important when using it with Alembic autogenerate. Pull request courtesy Dimitris Theodorou.

    This change is also backported to: 0.9.9

    References: pull request bitbucket:41

  • [sql] [bug] Fixed bug where using a TypeDecorator that implemented a type that was also a TypeDecorator would fail with Python’s “Cannot create a consistent method resolution order (MRO)” error, when any kind of SQL comparison expression were used against an object using this type.

    This change is also backported to: 0.9.9

    References: #3278

  • [sql] [bug] Fixed issue where the columns from a SELECT embedded in an INSERT, either through the values clause or as a “from select”, would pollute the column types used in the result set produced by the RETURNING clause when columns from both statements shared the same name, leading to potential errors or mis-adaptation when retrieving the returning rows.

    This change is also backported to: 0.9.9

    References: #3248

  • [sql] [bug] Fixed bug where a fair number of SQL elements within the sql package would fail to __repr__() successfully, due to a missing description attribute that would then invoke a recursion overflow when an internal AttributeError would then re-invoke __repr__().

    This change is also backported to: 0.9.8

    References: #3195

  • [sql] [bug] An adjustment to table/index reflection such that if an index reports a column that isn’t found to be present in the table, a warning is emitted and the column is skipped. This can occur for some special system column situations as has been observed with Oracle.

    This change is also backported to: 0.9.8

    References: #3180

  • [sql] [bug] Fixed bug in CTE where literal_binds compiler argument would not be always be correctly propagated when one CTE referred to another aliased CTE in a statement.

    This change is also backported to: 0.9.8

    References: #3154

  • [sql] [bug] Fixed 0.9.7 regression caused by #3067 in conjunction with a mis-named unit test such that so-called “schema” types like Boolean and Enum could no longer be pickled.

    This change is also backported to: 0.9.8

    References: #3144, #3067

  • [sql] [bug] Fix bug in naming convention feature where using a check constraint convention that includes constraint_name would then force all Boolean and Enum types to require names as well, as these implicitly create a constraint, even if the ultimate target backend were one that does not require generation of the constraint such as Postgresql. The mechanics of naming conventions for these particular constraints has been reorganized such that the naming determination is done at DDL compile time, rather than at constraint/table construction time.

    This change is also backported to: 0.9.7

    References: #3067

  • [sql] [bug] Fixed bug in common table expressions whereby positional bound parameters could be expressed in the wrong final order when CTEs were nested in certain ways.

    This change is also backported to: 0.9.7

    References: #3090

  • [sql] [bug] Fixed bug where multi-valued Insert construct would fail to check subsequent values entries beyond the first one given for literal SQL expressions.

    This change is also backported to: 0.9.7

    References: #3069

  • [sql] [bug] Added a “str()” step to the dialect_kwargs iteration for Python version < 2.6.5, working around the “no unicode keyword arg” bug as these args are passed along as keyword args within some reflection processes.

    This change is also backported to: 0.9.7

    References: #3123

  • [sql] [bug] The TypeEngine.with_variant() method will now accept a type class as an argument which is internally converted to an instance, using the same convention long established by other constructs such as Column.

    This change is also backported to: 0.9.7

    References: #3122

  • [sql] [bug] The Column.nullable flag is implicitly set to False when that Column is referred to in an explicit PrimaryKeyConstraint for that table. This behavior now matches that of when the Column itself has the Column.primary_key flag set to True, which is intended to be an exactly equivalent case.

    This change is also backported to: 0.9.5

    References: #3023

  • [sql] [bug] Fixed bug where the Operators.__and__(), Operators.__or__() and Operators.__invert__() operator overload methods could not be overridden within a custom TypeEngine.Comparator implementation.

    This change is also backported to: 0.9.5

    References: #3012

  • [sql] [bug] Fixed bug in new DialectKWArgs.argument_for() method where adding an argument for a construct not previously included for any special arguments would fail.

    This change is also backported to: 0.9.5

    References: #3024

  • [sql] [bug] Fixed regression introduced in 0.9 where new “ORDER BY <labelname>” feature from #1068 would not apply quoting rules to the label name as rendered in the ORDER BY.

    This change is also backported to: 0.9.5

    References: #1068, #3020

  • [sql] [bug] Restored the import for Function to the sqlalchemy.sql.expression import namespace, which was removed at the beginning of 0.9.

    This change is also backported to: 0.9.5

  • [sql] [bug] Fixed bug in Enum and other SchemaType subclasses where direct association of the type with a MetaData would lead to a hang when events (like create events) were emitted on the MetaData.

    This change is also backported to: 0.9.7, 0.8.7

    References: #3124

  • [sql] [bug] Fixed a bug within the custom operator plus TypeEngine.with_variant() system, whereby using a TypeDecorator in conjunction with variant would fail with an MRO error when a comparison operator was used.

    This change is also backported to: 0.9.7, 0.8.7

    References: #3102

  • [sql] [bug] Fixed bug in INSERT..FROM SELECT construct where selecting from a UNION would wrap the union in an anonymous (e.g. unlabled) subquery.

    This change is also backported to: 0.9.5, 0.8.7

    References: #3044

  • [sql] [bug] Fixed bug where Table.update() and Table.delete() would produce an empty WHERE clause when an empty and_() or or_() or other blank expression were applied. This is now consistent with that of select().

    This change is also backported to: 0.9.5, 0.8.7

    References: #3045

  • [sql] [bug] The multi-values version of Insert.values() has been repaired to work more usefully with tables that have Python- side default values and/or functions, as well as server-side defaults. The feature will now work with a dialect that uses “positional” parameters; a Python callable will also be invoked individually for each row just as is the case with an “executemany” style invocation; a server- side default column will no longer implicitly receive the value explicitly specified for the first row, instead refusing to invoke without an explicit value.

    References: #3288

  • [sql] [bug] Fixed bug in Table.tometadata() method where the CheckConstraint associated with a Boolean or Enum type object would be doubled in the target table. The copy process now tracks the production of this constraint object as local to a type object.

    References: #3260

  • [sql] [bug] The behavioral contract of the ForeignKeyConstraint.columns collection has been made consistent; this attribute is now a ColumnCollection like that of all other constraints and is initialized at the point when the constraint is associated with a Table.

    References: #3243

  • [sql] [bug] The Column.key attribute is now used as the source of anonymous bound parameter names within expressions, to match the existing use of this value as the key when rendered in an INSERT or UPDATE statement. This allows Column.key to be used as a “substitute” string to work around a difficult column name that doesn’t translate well into a bound parameter name. Note that the paramstyle is configurable on create_engine() in any case, and most DBAPIs today support a named and positional style.

    References: #3245

  • [sql] [bug] Fixed the name of the PoolEvents.reset.dbapi_connection parameter as passed to this event; in particular this affects usage of the “named” argument style for this event. Pull request courtesy Jason Goldberger.

    References: pull request github:146

  • [sql] [bug] Reversing a change that was made in 0.9, the “singleton” nature of the “constants” null(), true(), and false() has been reverted. These functions returning a “singleton” object had the effect that different instances would be treated as the same regardless of lexical use, which in particular would impact the rendering of the columns clause of a SELECT statement.

    References: #3170

  • [sql] [bug] [engine] Fixed bug where a “branched” connection, that is the kind you get when you call Connection.connect(), would not share invalidation status with the parent. The architecture of branching has been tweaked a bit so that the branched connection defers to the parent for all invalidation status and operations.

    References: #3215

  • [sql] [bug] [engine] Fixed bug where a “branched” connection, that is the kind you get when you call Connection.connect(), would not share transaction status with the parent. The architecture of branching has been tweaked a bit so that the branched connection defers to the parent for all transactional status and operations.

    References: #3190

  • [sql] [bug] Using Insert.from_select() now implies inline=True on insert(). This helps to fix a bug where an INSERT...FROM SELECT construct would inadvertently be compiled as “implicit returning” on supporting backends, which would cause breakage in the case of an INSERT that inserts zero rows (as implicit returning expects a row), as well as arbitrary return data in the case of an INSERT that inserts multiple rows (e.g. only the first row of many). A similar change is also applied to an INSERT..VALUES with multiple parameter sets; implicit RETURNING will no longer emit for this statement either. As both of these constructs deal with varible numbers of rows, the ResultProxy.inserted_primary_key accessor does not apply. Previously, there was a documentation note that one may prefer inline=True with INSERT..FROM SELECT as some databases don’t support returning and therefore can’t do “implicit” returning, but there’s no reason an INSERT...FROM SELECT needs implicit returning in any case. Regular explicit Insert.returning() should be used to return variable numbers of result rows if inserted data is needed.

    References: #3169

  • [sql] [enhancement] Custom dialects that implement GenericTypeCompiler can now be constructed such that the visit methods receive an indication of the owning expression object, if any. Any visit method that accepts keyword arguments (e.g. **kw) will in most cases receive a keyword argument type_expression, referring to the expression object that the type is contained within. For columns in DDL, the dialect’s compiler class may need to alter its get_column_specification() method to support this as well. The UserDefinedType.get_col_spec() method will also receive type_expression if it provides **kw in its argument signature.

    References: #3074

schema

postgresql

  • [postgresql] [feature] Added support for the CONCURRENTLY keyword with Postgresql indexes, established using postgresql_concurrently. Pull request courtesy Iuri de Silvio.

    This change is also backported to: 0.9.9

    References: pull request bitbucket:45

  • [postgresql] [feature] [pg8000] Support is added for “sane multi row count” with the pg8000 driver, which applies mostly to when using versioning with the ORM. The feature is version-detected based on pg8000 1.9.14 or greater in use. Pull request courtesy Tony Locke.

    This change is also backported to: 0.9.8

    References: pull request github:125

  • [postgresql] [feature] Added kw argument postgresql_regconfig to the ColumnOperators.match() operator, allows the “reg config” argument to be specified to the to_tsquery() function emitted. Pull request courtesy Jonathan Vanasco.

    This change is also backported to: 0.9.7

    References: #3078, pull request bitbucket:22

  • [postgresql] [feature] Added support for Postgresql JSONB via JSONB. Pull request courtesy Damian Dimmich.

    This change is also backported to: 0.9.7

    References: pull request github:101

  • [postgresql] [feature] Added support for AUTOCOMMIT isolation level when using the pg8000 DBAPI. Pull request courtesy Tony Locke.

    This change is also backported to: 0.9.5

    References: pull request github:88

  • [postgresql] [feature] Added a new flag ARRAY.zero_indexes to the Postgresql ARRAY type. When set to True, a value of one will be added to all array index values before passing to the database, allowing better interoperability between Python style zero-based indexes and Postgresql one-based indexes. Pull request courtesy Alexey Terentev.

    This change is also backported to: 0.9.5

    References: #2785, pull request bitbucket:18

  • [postgresql] [feature] The PG8000 dialect now supports the create_engine.encoding parameter, by setting up the client encoding on the connection which is then intercepted by pg8000. Pull request courtesy Tony Locke.

    References: pull request github:132

  • [postgresql] [feature] Added support for PG8000’s native JSONB feature. Pull request courtesy Tony Locke.

    References: pull request github:132

  • [postgresql] [feature] [pypy] Added support for the psycopg2cffi DBAPI on pypy. Pull request courtesy shauns.

    References: #3052, pull request bitbucket:34

  • [postgresql] [feature] Added support for the FILTER keyword as applied to aggregate functions, supported by Postgresql 9.4. Pull request courtesy Ilja Everilä.

    References: pull request github:134

  • [postgresql] [feature] Support has been added for reflection of materialized views and foreign tables, as well as support for materialized views within Inspector.get_view_names(), and a new method PGInspector.get_foreign_table_names() available on the Postgresql version of Inspector. Pull request courtesy Rodrigo Menezes.

    References: #2891, pull request github:128

  • [postgresql] [feature] Added support for PG table options TABLESPACE, ON COMMIT, WITH(OUT) OIDS, and INHERITS, when rendering DDL via the Table construct. Pull request courtesy malikdiarra.

    References: #2051

  • [postgresql] [feature] Added new method PGInspector.get_enums(), when using the inspector for Postgresql will provide a list of ENUM types. Pull request courtesy Ilya Pekelny.

    References: pull request github:126

  • [postgresql] [bug] Repaired support for Postgresql UUID types in conjunction with the ARRAY type when using psycopg2. The psycopg2 dialect now employs use of the psycopg2.extras.register_uuid() hook so that UUID values are always passed to/from the DBAPI as UUID() objects. The UUID.as_uuid flag is still honored, except with psycopg2 we need to convert returned UUID objects back into strings when this is disabled.

    This change is also backported to: 0.9.9

    References: #2940

  • [postgresql] [bug] Added support for the postgresql.JSONB datatype when using psycopg2 2.5.4 or greater, which features native conversion of JSONB data so that SQLAlchemy’s converters must be disabled; additionally, the newly added psycopg2 extension extras.register_default_jsonb is used to establish a JSON deserializer passed to the dialect via the json_deserializer argument. Also repaired the Postgresql integration tests which weren’t actually round-tripping the JSONB type as opposed to the JSON type. Pull request courtesy Mateusz Susik.

    This change is also backported to: 0.9.9

    References: pull request github:145

  • [postgresql] [bug] Repaired the use of the “array_oid” flag when registering the HSTORE type with older psycopg2 versions < 2.4.3, which does not support this flag, as well as use of the native json serializer hook “register_default_json” with user-defined json_deserializer on psycopg2 versions < 2.5, which does not include native json.

    This change is also backported to: 0.9.9

  • [postgresql] [bug] Fixed bug where Postgresql dialect would fail to render an expression in an Index that did not correspond directly to a table-bound column; typically when a text() construct was one of the expressions within the index; or could misinterpret the list of expressions if one or more of them were such an expression.

    This change is also backported to: 0.9.9

    References: #3174

  • [postgresql] [bug] A revisit to this issue first patched in 0.9.5, apparently psycopg2’s .closed accessor is not as reliable as we assumed, so we have added an explicit check for the exception messages “SSL SYSCALL error: Bad file descriptor” and “SSL SYSCALL error: EOF detected” when detecting an is-disconnect scenario. We will continue to consult psycopg2’s connection.closed as a first check.

    This change is also backported to: 0.9.8

    References: #3021

  • [postgresql] [bug] Fixed bug where Postgresql JSON type was not able to persist or otherwise render a SQL NULL column value, rather than a JSON-encoded 'null'. To support this case, changes are as follows:

    • The value null() can now be specified, which will always result in a NULL value resulting in the statement.
    • A new parameter JSON.none_as_null is added, which when True indicates that the Python None value should be peristed as SQL NULL, rather than JSON-encoded 'null'.

    Retrival of NULL as None is also repaired for DBAPIs other than psycopg2, namely pg8000.

    This change is also backported to: 0.9.8

    References: #3159

  • [postgresql] [bug] The exception wrapping system for DBAPI errors can now accommodate non-standard DBAPI exceptions, such as the psycopg2 TransactionRollbackError. These exceptions will now be raised using the closest available subclass in sqlalchemy.exc, in the case of TransactionRollbackError, sqlalchemy.exc.OperationalError.

    This change is also backported to: 0.9.8

    References: #3075

  • [postgresql] [bug] Fixed bug in postgresql.array object where comparison to a plain Python list would fail to use the correct array constructor. Pull request courtesy Andrew.

    This change is also backported to: 0.9.8

    References: #3141, pull request github:124

  • [postgresql] [bug] Added a supported FunctionElement.alias() method to functions, e.g. the func construct. Previously, behavior for this method was undefined. The current behavior mimics that of pre-0.9.4, which is that the function is turned into a single-column FROM clause with the given alias name, where the column itself is anonymously named.

    This change is also backported to: 0.9.8

    References: #3137

  • [postgresql] [bug] [pg8000] Fixed bug introduced in 0.9.5 by new pg8000 isolation level feature where engine-level isolation level parameter would raise an error on connect.

    This change is also backported to: 0.9.7

    References: #3134

  • [postgresql] [bug] The psycopg2 .closed accessor is now consulted when determining if an exception is a “disconnect” error; ideally, this should remove the need for any other inspection of the exception message to detect disconnect, however we will leave those existing messages in place as a fallback. This should be able to handle newer cases like “SSL EOF” conditions. Pull request courtesy Dirk Mueller.

    This change is also backported to: 0.9.5

    References: #3021, pull request github:87

  • [postgresql] [bug] Added the hashable=False flag to the PG HSTORE type, which is needed to allow the ORM to skip over trying to “hash” an ORM-mapped HSTORE column when requesting it in a mixed column/entity list. Patch courtesy Gunnlaugur Þór Briem.

    This change is also backported to: 0.9.5, 0.8.7

    References: #3053

  • [postgresql] [bug] Added a new “disconnect” message “connection has been closed unexpectedly”. This appears to be related to newer versions of SSL. Pull request courtesy Antti Haapala.

    This change is also backported to: 0.9.5, 0.8.7

    References: pull request bitbucket:13

  • [postgresql] [bug] The Postgresql postgresql.ENUM type will emit a DROP TYPE instruction when a plain table.drop() is called, assuming the object is not associated directly with a MetaData object. In order to accomodate the use case of an enumerated type shared between multiple tables, the type should be associated directly with the MetaData object; in this case the type will only be created at the metadata level, or if created directly. The rules for create/drop of Postgresql enumerated types have been highly reworked in general.

    References: #3319

  • [postgresql] [bug] The PGDialect.has_table() method will now query against pg_catalog.pg_table_is_visible(c.oid), rather than testing for an exact schema match, when the schema name is None; this so that the method will also illustrate that temporary tables are present. Note that this is a behavioral change, as Postgresql allows a non-temporary table to silently overwrite an existing temporary table of the same name, so this changes the behavior of checkfirst in that unusual scenario.

    References: #3264

  • [postgresql] [enhancement] Added a new type postgresql.OID to the Postgresql dialect. While “oid” is generally a private type within PG that is not exposed in modern versions, there are some PG use cases such as large object support where these types might be exposed, as well as within some user-reported schema reflection use cases.

    This change is also backported to: 0.9.5

    References: #3002

mysql

  • [mysql] [feature] The MySQL dialect now renders TIMESTAMP with NULL / NOT NULL in all cases, so that MySQL 5.6.6 with the explicit_defaults_for_timestamp flag enabled will will allow TIMESTAMP to continue to work as expected when nullable=False. Existing applications are unaffected as SQLAlchemy has always emitted NULL for a TIMESTAMP column that is nullable=True.

    References: #3155

  • [mysql] [feature] Updated the “supports_unicode_statements” flag to True for MySQLdb and Pymysql under Python 2. This refers to the SQL statements themselves, not the parameters, and affects issues such as table and column names using non-ASCII characters. These drivers both appear to support Python 2 Unicode objects without issue in modern versions.

    References: #3121

  • [mysql] [bug] Added a version check to the MySQLdb dialect surrounding the check for ‘utf8_bin’ collation, as this fails on MySQL server < 5.0.

    This change is also backported to: 0.9.9

    References: #3274

  • [mysql] [bug] [mysqlconnector] Mysqlconnector as of version 2.0, probably as a side effect of the python 3 merge, now does not expect percent signs (e.g. as used as the modulus operator and others) to be doubled, even when using the “pyformat” bound parameter format (this change is not documented by Mysqlconnector). The dialect now checks for py2k and for mysqlconnector less than version 2.0 when detecting if the modulus operator should be rendered as %% or %.

    This change is also backported to: 0.9.8

  • [mysql] [bug] [mysqlconnector] Unicode SQL is now passed for MySQLconnector version 2.0 and above; for Py2k and MySQL < 2.0, strings are encoded.

    This change is also backported to: 0.9.8

  • [mysql] [bug] MySQL error 2014 “commands out of sync” appears to be raised as a ProgrammingError, not OperationalError, in modern MySQL-Python versions; all MySQL error codes that are tested for “is disconnect” are now checked within OperationalError and ProgrammingError regardless.

    This change is also backported to: 0.9.7, 0.8.7

    References: #3101

  • [mysql] [bug] Fixed bug where column names added to mysql_length parameter on an index needed to have the same quoting for quoted names in order to be recognized. The fix makes the quotes optional but also provides the old behavior for backwards compatibility with those using the workaround.

    This change is also backported to: 0.9.5, 0.8.7

    References: #3085

  • [mysql] [bug] Added support for reflecting tables where an index includes KEY_BLOCK_SIZE using an equal sign. Pull request courtesy Sean McGivern.

    This change is also backported to: 0.9.5, 0.8.7

    References: pull request bitbucket:15

  • [mysql] [bug] The MySQL dialect now supports CAST on types that are constructed as TypeDecorator objects.

  • [mysql] [bug] A warning is emitted when cast() is used with the MySQL dialect on a type where MySQL does not support CAST; MySQL only supports CAST on a subset of datatypes. SQLAlchemy has for a long time just omitted the CAST for unsupported types in the case of MySQL. While we don’t want to change this now, we emit a warning to show that it’s taken place. A warning is also emitted when a CAST is used with an older MySQL version (< 4) that doesn’t support CAST at all, it’s skipped in this case as well.

    References: #3237

  • [mysql] [bug] The mysql.SET type has been overhauled to no longer assume that the empty string, or a set with a single empty string value, is in fact a set with a single empty string; instead, this is by default treated as the empty set. In order to handle persistence of a mysql.SET that actually wants to include the blank value '' as a legitimate value, a new bitwise operational mode is added which is enabled by the mysql.SET.retrieve_as_bitwise flag, which will persist and retrieve values unambiguously using their bitflag positioning. Storage and retrieval of unicode values for driver configurations that aren’t converting unicode natively is also repaired.

    References: #3283

  • [mysql] [bug] The ColumnOperators.match() operator is now handled such that the return type is not strictly assumed to be boolean; it now returns a Boolean subclass called MatchType. The type will still produce boolean behavior when used in Python expressions, however the dialect can override its behavior at result time. In the case of MySQL, while the MATCH operator is typically used in a boolean context within an expression, if one actually queries for the value of a match expression, a floating point value is returned; this value is not compatible with SQLAlchemy’s C-based boolean processor, so MySQL’s result-set behavior now follows that of the Float type. A new operator object notmatch_op is also added to better allow dialects to define the negation of a match operation.

    References: #3263

  • [mysql] [bug] MySQL boolean symbols “true”, “false” work again. 0.9’s change in #2682 disallowed the MySQL dialect from making use of the “true” and “false” symbols in the context of “IS” / “IS NOT”, but MySQL supports this syntax even though it has no boolean type. MySQL remains “non native boolean”, but the true() and false() symbols again produce the keywords “true” and “false”, so that an expression like column.is_(true()) again works on MySQL.

    References: #3186

  • [mysql] [bug] The MySQL dialect will now disable ConnectionEvents.handle_error() events from firing for those statements which it uses internally to detect if a table exists or not. This is achieved using an execution option skip_user_error_events that disables the handle error event for the scope of that execution. In this way, user code that rewrites exceptions doesn’t need to worry about the MySQL dialect or other dialects that occasionally need to catch SQLAlchemy specific exceptions.

  • [mysql] [bug] Changed the default value of “raise_on_warnings” to False for MySQLconnector. This was set at True for some reason. The “buffered” flag unfortunately must stay at True as MySQLconnector does not allow a cursor to be closed unless all results are fully fetched.

    References: #2515

  • [mysql] [change] The gaerdbms dialect is no longer necessary, and emits a deprecation warning. Google now recommends using the MySQLdb dialect directly.

    This change is also backported to: 0.9.9

    References: #3275

sqlite

  • [sqlite] [feature] Added support for partial indexes (e.g. with a WHERE clause) on SQLite. Pull request courtesy Kai Groner.

    See also

    Partial Indexes

    This change is also backported to: 0.9.9

    References: pull request bitbucket:42

  • [sqlite] [feature] Added a new SQLite backend for the SQLCipher backend. This backend provides for encrypted SQLite databases using the pysqlcipher Python driver, which is very similar to the pysqlite driver.

    See also

    pysqlcipher

    This change is also backported to: 0.9.9

  • [sqlite] [bug] When selecting from a UNION using an attached database file, the pysqlite driver reports column names in cursor.description as ‘dbname.tablename.colname’, instead of ‘tablename.colname’ as it normally does for a UNION (note that it’s supposed to just be ‘colname’ for both, but we work around it). The column translation logic here has been adjusted to retrieve the rightmost token, rather than the second token, so it works in both cases. Workaround courtesy Tony Roberts.

    This change is also backported to: 0.9.8

    References: #3211

  • [sqlite] [bug] Fixed a SQLite join rewriting issue where a subquery that is embedded as a scalar subquery such as within an IN would receive inappropriate substitutions from the enclosing query, if the same table were present inside the subquery as were in the enclosing query such as in a joined inheritance scenario.

    This change is also backported to: 0.9.7

    References: #3130

  • [sqlite] [bug] UNIQUE and FOREIGN KEY constraints are now fully reflected on SQLite both with and without names. Previously, foreign key names were ignored and unnamed unique constraints were skipped. Thanks to Jon Nelson for assistance with this.

    References: #3261, #3244

  • [sqlite] [bug] The SQLite dialect, when using the sqlite.DATE, sqlite.TIME, or sqlite.DATETIME types, and given a storage_format that only renders numbers, will render the types in DDL as DATE_CHAR, TIME_CHAR, and DATETIME_CHAR, so that despite the lack of alpha characters in the values, the column will still deliver the “text affinity”. Normally this is not needed, as the textual values within the default storage formats already imply text.

    References: #3257

  • [sqlite] [bug] SQLite now supports reflection of unique constraints from temp tables; previously, this would fail with a TypeError. Pull request courtesy Johannes Erdfelt.

    See also

    SQLite/Oracle have distinct methods for temporary table/view name reporting - changes regarding SQLite temporary table and view reflection.

    References: #3203, pull request bitbucket:31

  • [sqlite] [bug] Added Inspector.get_temp_table_names() and Inspector.get_temp_view_names(); currently, only the SQLite and Oracle dialects support these methods. The return of temporary table and view names has been removed from SQLite and Oracle’s version of Inspector.get_table_names() and Inspector.get_view_names(); other database backends cannot support this information (such as MySQL), and the scope of operation is different in that the tables can be local to a session and typically aren’t supported in remote schemas.

    References: #3204

mssql

  • [mssql] [feature] Enabled “multivalues insert” for SQL Server 2008. Pull request courtesy Albert Cervin. Also expanded the checks for “IDENTITY INSERT” mode to include when the identity key is present in the VALUEs clause of the statement.

    This change is also backported to: 0.9.7

    References: pull request github:98

  • [mssql] [feature] SQL Server 2012 now recommends VARCHAR(max), NVARCHAR(max), VARBINARY(max) for large text/binary types. The MSSQL dialect will now respect this based on version detection, as well as the new deprecate_large_types flag.

    References: #3039

  • [mssql] [changed] The hostname-based connection format for SQL Server when using pyodbc will no longer specify a default “driver name”, and a warning is emitted if this is missing. The optimal driver name for SQL Server changes frequently and is per-platform, so hostname based connections need to specify this. DSN-based connections are preferred.

    References: #3182

  • [mssql] [bug] Fixed the version string detection in the pymssql dialect to work with Microsoft SQL Azure, which changes the word “SQL Server” to “SQL Azure”.

    This change is also backported to: 0.9.8

    References: #3151

  • [mssql] [bug] Revised the query used to determine the current default schema name to use the database_principal_id() function in conjunction with the sys.database_principals view so that we can determine the default schema independently of the type of login in progress (e.g., SQL Server, Windows, etc).

    This change is also backported to: 0.9.5

    References: #3025

  • [mssql] [bug] Added statement encoding to the “SET IDENTITY_INSERT” statements which operate when an explicit INSERT is being interjected into an IDENTITY column, to support non-ascii table identifiers on drivers such as pyodbc + unix + py2k that don’t support unicode statements.

    This change is also backported to: 0.9.7, 0.8.7

  • [mssql] [bug] In the SQL Server pyodbc dialect, repaired the implementation for the description_encoding dialect parameter, which when not explicitly set was preventing cursor.description from being parsed correctly in the case of result sets that contained names in alternate encodings. This parameter shouldn’t be needed going forward.

    This change is also backported to: 0.9.7, 0.8.7

    References: #3091

oracle

  • [oracle] [feature] Added support for cx_oracle connections to a specific service name, as opposed to a tns name, by passing ?service_name=<name> to the URL. Pull request courtesy Sławomir Ehlert.

    References: pull request github:152

  • [oracle] [feature] New Oracle DDL features for tables, indexes: COMPRESS, BITMAP. Patch courtesy Gabor Gombas.

  • [oracle] [feature] Added support for CTEs under Oracle. This includes some tweaks to the aliasing syntax, as well as a new CTE feature CTE.suffix_with(), which is useful for adding in special Oracle-specific directives to the CTE.

    References: #3220

  • [oracle] [feature] Added support for the Oracle table option ON COMMIT.

  • [oracle] [bug] Fixed long-standing bug in Oracle dialect where bound parameter names that started with numbers would not be quoted, as Oracle doesn’t like numerics in bound parameter names.

    This change is also backported to: 0.9.8

    References: #2138

  • [oracle] [bug] [tests] Fixed bug in oracle dialect test suite where in one test, ‘username’ was assumed to be in the database URL, even though this might not be the case.

    This change is also backported to: 0.9.7

    References: #3128

  • [oracle] [bug] An alias name will be properly quoted when referred to using the %(name)s token inside the Select.with_hint() method. Previously, the Oracle backend hadn’t implemented this quoting.

misc

  • [feature] [examples] Added a new example illustrating materialized paths, using the latest relationship features. Example courtesy Jack Zhou.

    This change is also backported to: 0.9.5

    References: pull request bitbucket:21

  • [feature] [ext] Added a new extension suite sqlalchemy.ext.baked. This simple but unusual system allows for a dramatic savings in Python overhead for the construction and processing of orm Query objects, from query construction up through rendering of a string SQL statement.

    See also

    Baked Queries

    References: #3054

  • [feature] [examples] A new suite of examples dedicated to providing a detailed study into performance of SQLAlchemy ORM and Core, as well as the DBAPI, from multiple perspectives. The suite runs within a container that provides built in profiling displays both through console output as well as graphically via the RunSnake tool.

    See also

    Performance

  • [feature] [ext] The sqlalchemy.ext.automap extension will now set cascade="all, delete-orphan" automatically on a one-to-many relationship/backref where the foreign key is detected as containing one or more non-nullable columns. This argument is present in the keywords passed to automap.generate_relationship() in this case and can still be overridden. Additionally, if the ForeignKeyConstraint specifies ondelete="CASCADE" for a non-nullable or ondelete="SET NULL" for a nullable set of columns, the argument passive_deletes=True is also added to the relationship. Note that not all backends support reflection of ondelete, but backends that do include Postgresql and MySQL.

    References: #3210

  • [removed] The Drizzle dialect has been removed from the Core; it is now available as sqlalchemy-drizzle, an independent, third party dialect. The dialect is still based almost entirely off of the MySQL dialect present in SQLAlchemy.

  • [bug] [ext] [py3k] Fixed bug where the association proxy list class would not interpret slices correctly under Py3K. Pull request courtesy Gilles Dartiguelongue.

    This change is also backported to: 0.9.9

    References: pull request github:154

  • [bug] [examples] Updated the Versioning with a History Table example such that mapped columns are re-mapped to match column names as well as grouping of columns; in particular, this allows columns that are explicitly grouped in a same-column-named joined inheritance scenario to be mapped in the same way in the history mappings, avoiding warnings added in the 0.9 series regarding this pattern and allowing the same view of attribute keys.

    This change is also backported to: 0.9.9

  • [bug] [examples] Fixed a bug in the examples/generic_assocaitions/discriminator_on_association.py example, where the subclasses of AddressAssociation were not being mapped as “single table inheritance”, leading to problems when trying to use the mappings further.

    This change is also backported to: 0.9.9

  • [bug] [declarative] Fixed an unlikely race condition observed in some exotic end-user setups, where the attempt to check for “duplicate class name” in declarative would hit upon a not-totally-cleaned-up weak reference related to some other class being removed; the check here now ensures the weakref still references an object before calling upon it further.

    This change is also backported to: 0.9.8

    References: #3208

  • [bug] [ext] Fixed bug in ordering list where the order of items would be thrown off during a collection replace event, if the reorder_on_append flag were set to True. The fix ensures that the ordering list only impacts the list that is explicitly associated with the object.

    This change is also backported to: 0.9.8

    References: #3191

  • [bug] [ext] Fixed bug where ext.mutable.MutableDict failed to implement the update() dictionary method, thus not catching changes. Pull request courtesy Matt Chisholm.

    This change is also backported to: 0.9.8

  • [bug] [ext] Fixed bug where a custom subclass of ext.mutable.MutableDict would not show up in a “coerce” operation, and would instead return a plain ext.mutable.MutableDict. Pull request courtesy Matt Chisholm.

    This change is also backported to: 0.9.8

  • [bug] [pool] Fixed bug in connection pool logging where the “connection checked out” debug logging message would not emit if the logging were set up using logging.setLevel(), rather than using the echo_pool flag. Tests to assert this logging have been added. This is a regression that was introduced in 0.9.0.

    This change is also backported to: 0.9.8

    References: #3168

  • [bug] [tests] Fixed bug where “python setup.py test” wasn’t calling into distutils appropriately, and errors would be emitted at the end of the test suite.

    This change is also backported to: 0.9.7

  • [bug] [declarative] Fixed bug when the declarative __abstract__ flag was not being distinguished for when it was actually the value False. The __abstract__ flag needs to acutally evaluate to a True value at the level being tested.

    This change is also backported to: 0.9.7

    References: #3097

  • [bug] [testsuite] In public test suite, shanged to use of String(40) from less-supported Text in StringTest.test_literal_backslashes. Pullreq courtesy Jan.

    This change is also backported to: 0.9.5

    References: pull request github:95

  • [bug] [tests] [py3k] Corrected for some deprecation warnings involving the imp module and Python 3.3 or greater, when running tests. Pull request courtesy Matt Chisholm.

    This change is also backported to: 0.9.5

    References: #2830, pull request bitbucket:2830

  • [bug] [declarative] The __mapper_args__ dictionary is copied from a declarative mixin or abstract class when accessed, so that modifications made to this dictionary by declarative itself won’t conflict with that of other mappings. The dictionary is modified regarding the version_id_col and polymorphic_on arguments, replacing the column within with the one that is officially mapped to the local class/table.

    This change is also backported to: 0.9.5, 0.8.7

    References: #3062

  • [bug] [ext] Fixed bug in mutable extension where MutableDict did not report change events for the setdefault() dictionary operation.

    This change is also backported to: 0.9.5, 0.8.7

    References: #3093, #3051

  • [bug] [ext] Fixed bug where MutableDict.setdefault() didn’t return the existing or new value (this bug was not released in any 0.8 version). Pull request courtesy Thomas Hervé.

    This change is also backported to: 0.9.5, 0.8.7

    References: #3093, #3051, pull request bitbucket:24