compare.py 文件源码

def _make_unique_constraint(params, conn_table):
    uq = sa_schema.UniqueConstraint(
        *[conn_table.c[cname] for cname in params['column_names']],
        name=params['name']
    )
    if 'duplicates_index' in params:
        uq.info['duplicates_index'] = params['duplicates_index']

    return uq