63 lines
2.0 KiB
Python
63 lines
2.0 KiB
Python
"""
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Firebird database specific implementations of changeset classes.
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"""
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from sqlalchemy.databases import firebird as sa_base
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from migrate.changeset import ansisql, exceptions
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FBSchemaGenerator = sa_base.FBSchemaGenerator
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class FBColumnGenerator(FBSchemaGenerator, ansisql.ANSIColumnGenerator):
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"""Firebird column generator implementation."""
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class FBColumnDropper(ansisql.ANSIColumnDropper):
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"""Firebird column dropper implementation."""
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def visit_column(self, column):
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table = self.start_alter_table(column)
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self.append('DROP %s' % self.preparer.format_column(column))
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self.execute()
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class FBSchemaChanger(ansisql.ANSISchemaChanger):
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"""Firebird schema changer implementation."""
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def visit_table(self, table):
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"""Rename table not supported"""
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raise exceptions.NotSupportedError(
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"Firebird does not support renaming tables.")
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def _visit_column_name(self, table, col_name, delta):
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new_name = delta['name']
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self.start_alter_table(table)
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self.append('ALTER COLUMN %s TO %s' % ((col_name), (new_name)))
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def _visit_column_nullable(self, table, col_name, delta):
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"""Changing NULL is not supported"""
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# TODO: http://www.firebirdfaq.org/faq103/
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raise exceptions.NotSupportedError(
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"Firebird does not support altering NULL bevahior.")
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class FBConstraintGenerator(ansisql.ANSIConstraintGenerator):
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"""Firebird constraint generator implementation."""
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class FBConstraintDropper(ansisql.ANSIConstraintDropper):
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"""Firebird constaint dropper implementation."""
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def cascade_constraint(self, constraint):
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raise exceptions.NotSupportedError(
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"Firebird does not support cascading constraints")
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class FBDialect(ansisql.ANSIDialect):
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columngenerator = FBColumnGenerator
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columndropper = FBColumnDropper
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schemachanger = FBSchemaChanger
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constraintgenerator = FBConstraintGenerator
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constraintdropper = FBConstraintDropper
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