43 lines
1.4 KiB
Python
43 lines
1.4 KiB
Python
import re
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from sqlalchemy import types as sqltypes
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from .base import compiles, alter_table, format_table_name, RenameTable
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from .impl import DefaultImpl
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class PostgresqlImpl(DefaultImpl):
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__dialect__ = 'postgresql'
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transactional_ddl = True
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def compare_server_default(self, inspector_column,
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metadata_column,
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rendered_metadata_default,
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rendered_inspector_default):
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# don't do defaults for SERIAL columns
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if metadata_column.primary_key and \
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metadata_column is metadata_column.table._autoincrement_column:
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return False
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conn_col_default = rendered_inspector_default
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if None in (conn_col_default, rendered_metadata_default):
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return conn_col_default != rendered_metadata_default
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if metadata_column.type._type_affinity is not sqltypes.String:
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rendered_metadata_default = re.sub(r"^'|'$", "", rendered_metadata_default)
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return not self.connection.scalar(
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"SELECT %s = %s" % (
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conn_col_default,
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rendered_metadata_default
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)
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)
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@compiles(RenameTable, "postgresql")
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def visit_rename_table(element, compiler, **kw):
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return "%s RENAME TO %s" % (
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alter_table(compiler, element.table_name, element.schema),
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format_table_name(compiler, element.new_table_name, None)
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)
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