Hibernate: cannot simultaneously fetch multiple bags 问题的解决办法
2017-11-30 00:22
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在说解决cannot simultaneously fetch multiple bags异常之前，我先说下抓取策略
注解@Fetch(FetchMode.？)抓取策略有三种
1、FetchMode.JOIN（默认的抓取策略），采用外连接的形式，left outer join ... on
2、FetchMode.SELECT 会另外发送一条sql语句加载当前对象的关联实体
3、FetchMode.SUBSELECT 会另外发送一条select语句抓取前面查询到的所有实体对象的关联实体
通过Hibernate输出的SQL日志看成，个人感觉2、3的差别不是太大 ，都是另起select语句查询与当前某个实体相关联的其他实体。
方法1：
改变FetchMode为@Fetch(FetchMode.SUBSELECT)
更多参考链接：
1.链接1
2.链接2
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