The support for pool ping listeners to receive exception events via the :meth:`.ConnectionEvents.handle_error` event added in 2.0.0b1 for :ticket:`5648` failed to take into account dialect-specific ping routines such as that of MySQL and PostgreSQL. The dialect feature has been reworked so that all dialects participate within event handling. Additionally, a new boolean element :attr:`.ExceptionContext.is_pre_ping` is added which identifies if this operation is occurring within the pre-ping operation. For this release, third party dialects which implement a custom :meth:`_engine.Dialect.do_ping` method can opt in to the newly improved behavior by having their method no longer catch exceptions or check exceptions for "is_disconnect", instead just propagating all exceptions outwards. Checking the exception for "is_disconnect" is now done by an enclosing method on the default dialect, which ensures that the event hook is invoked for all exception scenarios before testing the exception as a "disconnect" exception. If an existing ``do_ping()`` method continues to catch exceptions and check "is_disconnect", it will continue to work as it did previously, but ``handle_error`` hooks will not have access to the exception if it isn't propagated outwards. Fixes: #5648 Change-Id: I6535d5cb389e1a761aad8c37cfeb332c548b876d
Adjusted ``oracledb`` thick mode flag to make ``thick_mode=False`` not enable thick mode. Previously only ``None`` was accepted as off value. Fixes: #9295 Change-Id: I1a8397c19d065dfc2dda597e719922fc8d31acb1
Remove ``typing.Self`` workaround, now using :pep:`673` for most methods that return ``Self``. Pull request courtesy Yurii Karabas. Fixes: #9254 Closes: #9255 Pull-request: https://github.com/sqlalchemy/sqlalchemy/pull/9255 Pull-request-sha: 2947df8ada79f5c3afe9c838e65993302199c2f7 Change-Id: Ic32015ad52e95a61f3913d43ea436aa9402804df
Fixed regression caused by issue :ticket:`9058` which adjusted the MySQL dialect's ``has_table()`` to again use "DESCRIBE", where the specific error code raised by MySQL version 8 when using a non-existent schema name was unexpected and failed to be interpreted as a boolean result. Fixed the SQLite dialect's ``has_table()`` function to correctly report False for queries that include a non-None schema name for a schema that doesn't exist; previously, a database error was raised. Fixes: #9251 Change-Id: I5ef9cf0887865c3c521d88bca0ba18954a108241
Added a full suite of new SQL bitwise operators, for performing database-side bitwise expressions on appropriate data values such as integers, bit-strings, and similar. Pull request courtesy Yegor Statkevich. Fixes: #8780 Closes: #9204 Pull-request: https://github.com/sqlalchemy/sqlalchemy/pull/9204 Pull-request-sha: a4541772a6a784f9161ad78ef84d2ea7a62fa8de Change-Id: I4c70e80f9548dcc1b4e3dccd71bd59d51d3ed46e
Added support for MySQL 8's new ``AS <name> ON DUPLICATE KEY`` syntax when using :meth:`_mysql.Insert.on_duplicate_key_update`, which is required for newer versions of MySQL 8 as the previous syntax using ``VALUES()`` now emits a deprecation warning with those versions. Server version detection is employed to determine if traditional MariaDB / MySQL < 8 ``VALUES()`` syntax should be used, vs. the newer MySQL 8 required syntax. Pull request courtesy Caspar Wylie. Fixes: #8626 Closes: #9210 Pull-request: https://github.com/sqlalchemy/sqlalchemy/pull/9210 Pull-request-sha: 1c8dfbf0b4c439d9ca2c194524c47eb7239ee3c5 Change-Id: I42c463837af06bc15b60c534159804193df07f02
Fixes: #9222 Change-Id: Ife841a5cf5ec896405e84d8570ef63ce6176a5ec