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Support DROP CONSTRAINT IF EXISTS #1651

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agriffin-grow
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Fixes #1650

Description

Adds support for the IF EXISTS clause on DROP CONSTRAINT operations

Checklist

This pull request is:

  • A documentation / typographical error fix
    • Good to go, no issue or tests are needed
  • A short code fix
    • please include the issue number, and create an issue if none exists, which
      must include a complete example of the issue. one line code fixes without an
      issue and demonstration will not be accepted.
    • Please include: Fixes: #<issue number> in the commit message
    • please include tests. one line code fixes without tests will not be accepted.
  • A new feature implementation
    • please include the issue number, and create an issue if none exists, which must
      include a complete example of how the feature would look.
    • Please include: Fixes: #<issue number> in the commit message
    • please include tests.

Have a nice day!

@zzzeek zzzeek requested a review from sqla-tester April 30, 2025 12:42
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OK, this is sqla-tester setting up my work on behalf of zzzeek to try to get revision 1c3c0d3 of this pull request into gerrit so we can run tests and reviews and stuff

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New Gerrit review created for change 1c3c0d3: https://gerrit.sqlalchemy.org/c/sqlalchemy/alembic/+/5878

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Michael Bayer (zzzeek) wrote:

code review left on gerrit

View this in Gerrit at https://gerrit.sqlalchemy.org/c/sqlalchemy/alembic/+/5878

:param if_exists: If True, adds IF EXISTS operator when
dropping the constraint

.. versionadded:: 1.15.4
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Michael Bayer (zzzeek) wrote:

1.15.3

View this in Gerrit at https://gerrit.sqlalchemy.org/c/sqlalchemy/alembic/+/5878

@@ -7,7 +7,7 @@

from . import ops
from .base import Operations
from ..util.sqla_compat import _copy
from ..util.sqla_compat import _copy, sqla_2
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Michael Bayer (zzzeek) wrote:

fix

View this in Gerrit at https://gerrit.sqlalchemy.org/c/sqlalchemy/alembic/+/5878

context = op_fixture()
if sqla_compat.sqla_2:
op.drop_constraint("foo_bar_bat", "t1", if_exists=True)
context.assert_("ALTER TABLE t1 DROP CONSTRAINT IF EXISTS foo_bar_bat")
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Michael Bayer (zzzeek) wrote:

looks like >79

View this in Gerrit at https://gerrit.sqlalchemy.org/c/sqlalchemy/alembic/+/5878

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Gerrit review https://gerrit.sqlalchemy.org/c/sqlalchemy/alembic/+/5878 has been merged. Congratulations! :)

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Add if_exists for dropping postgres constraints
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