operations.py 文件源码

def _primary_key_constraint(self, name, table_name, cols, schema=None):
        m = sa_schema.MetaData()
        columns = [sa_schema.Column(n, NULLTYPE) for n in cols]
        t1 = sa_schema.Table(table_name, m,
                *columns,
                schema=schema)
        p = sa_schema.PrimaryKeyConstraint(*columns, name=name)
        t1.append_constraint(p)
        return p