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 += ") "; 

  <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>