转载:https://www.cnblogs.com/ywqu/archive/2009/12/06/1618184.html https://www.cnblogs.com/liuling/archive/2013/05/03/classrelation.html 单向关联:A1->A2: 表示A Read More
posted @ 2018-10-24 16:41 _KikyoBK Views(218) Comments(0) Diggs(0) Edit