select=“com.demo.dao.UserMapper.findById” column=“uid”>
SELECT * FROM orders
SELECt * FROM orders WHERe uid = #{uid}
[](()2.对多操作:select=“com.demo.dao.OrderMapper.findByUid” column=“id”> select * from user

select=“com.demo.dao.UserMapper.findById” column=“uid”>
SELECT * FROM orders
SELECt * FROM orders WHERe uid = #{uid}
[](()2.对多操作:select=“com.demo.dao.OrderMapper.findByUid” column=“id”> select * from user