hibernate的hql查询多对多查询
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2022-06-15 23:16:12
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在hibernate的hql查询中,假如说分组信息与试题是多对多关系,那么我们要在hql查询中对含有多个分组信息的试题都要查询出来。并同时查询出相应试题的分组信息。那么此时hql要这样写:
附上多对多配置:
<set name="groups" table="TM_EDUCATION_CONTENT_GROUP" outer-join="false">
<key column="CONTENT_ID" />
<many-to-many class="com.gd.po.ClassicCasesGroup" column="GROUP_ID" />
</set>
<set name="modelContents" table="TM_MODELCONTENT_GROUP" outer-join="false">
<key column="GROUP_ID" />
<many-to-many class="com.gd.po.TmEduExamModelContent" column="MODELCONTENT_ID" />
</set>
String[] groupIds = ojbects[1].toString().split(","); String hql = "SELECT distinct a.id FROM TmEduExamContent a"; if(!"".equals(groupIds[0])){ hql += " join a.groups as b "; } hql += "and ( "; for(int i=0;i<groupIds.length;i++){ hql += "b.id="+groupIds[i] + " "; if(i != groupIds.length-1){ hql += "or "; } } hql += ") ";
附上多对多配置:
引用
<set name="groups" table="TM_EDUCATION_CONTENT_GROUP" outer-join="false">
<key column="CONTENT_ID" />
<many-to-many class="com.gd.po.ClassicCasesGroup" column="GROUP_ID" />
</set>
<set name="modelContents" table="TM_MODELCONTENT_GROUP" outer-join="false">
<key column="GROUP_ID" />
<many-to-many class="com.gd.po.TmEduExamModelContent" column="MODELCONTENT_ID" />
</set>
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