原始hql：(子查询写在from中，执行报错)
String hql = "select q from TWorkAutoQueue q ,( "
+"select distinct e.extId "
+"from YIProcessExt e,TWorkitem t "
+"where t.processInsId = e.extProcessInsId ) ext "
+"where ext.extid = q.extid";修改后hql：
String hql = "select q from TWorkAutoQueue q "
+"where q.extId in( "
+"select distinct e.extId "
+"from YIProcessExt e,TWorkitem t "
+"where t.processInsId = e.extProcessInsId ) ";总结：hibernate中使用子查询只能写在where后面
