engines.py 文件源码

def unapply_migration(self, name, statements, fake=False):
        import psycopg2
        connection = self.get_connection()
        with connection.cursor() as cursor:
            try:
                if not fake:
                    cursor.execute(statements)
            except (
                    psycopg2.OperationalError,
                    psycopg2.ProgrammingError) as e:
                connection.rollback()
                print(e.message)
                from sqlibrist.helpers import ApplyMigrationFailed

                raise ApplyMigrationFailed
            else:
                cursor.execute('DELETE FROM sqlibrist.migrations '
                               'WHERE migration = (%s); ', [name])
                connection.commit()