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Mybatis框架写Dao.xml

Mybatis框架写Dao.xml

Weinger 2017-03-20 16:54:37
ABC三个表,A中a_id是B中的外键,B中的b_id是C中的外键,提取ABC表中某些数据时,Testdao.xml如何写,求指教
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反对 回复 2021-10-19
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select * from A 
left join B on A.a_id=B.a_id
left join C on B.b_id=C.b_id;


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反对 回复 2017-03-21
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