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"""
`PostgreSQL`_ database specific implementations of changeset classes.
.. _`PostgreSQL`: http://www.postgresql.org/
"""
from migrate.changeset import ansisql, SQLA_06
if not SQLA_06:
from sqlalchemy.databases import postgres as sa_base
PGSchemaGenerator = sa_base.PGSchemaGenerator
else:
from sqlalchemy.databases import postgresql as sa_base
PGSchemaGenerator = sa_base.PGDDLCompiler
class PGColumnGenerator(PGSchemaGenerator, ansisql.ANSIColumnGenerator):
"""PostgreSQL column generator implementation."""
pass
class PGColumnDropper(ansisql.ANSIColumnDropper):
"""PostgreSQL column dropper implementation."""
pass
class PGSchemaChanger(ansisql.ANSISchemaChanger):
"""PostgreSQL schema changer implementation."""
pass
class PGConstraintGenerator(ansisql.ANSIConstraintGenerator):
"""PostgreSQL constraint generator implementation."""
pass
class PGConstraintDropper(ansisql.ANSIConstraintDropper):
"""PostgreSQL constaint dropper implementation."""
pass
class PGDialect(ansisql.ANSIDialect):
columngenerator = PGColumnGenerator
columndropper = PGColumnDropper
schemachanger = PGSchemaChanger
constraintgenerator = PGConstraintGenerator
constraintdropper = PGConstraintDropper
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