iBatis配置文件SQL语句的配置求教！

[名字要很长很长]

<select id="getLdTxzDeptSelf" resultMap="exposition" parameterClass="expositionModel">
  select e.*,d.name from Exposition e,Department d where e.reportUint=d.deptId
  and e.reportUint in (select deptId from Department where fdeptId in
  (select fdeptid from Department where d.deptId=$deptId$) and departType=2)
</select>

这样在iBatis配置文件貌似不行，不能直接放到iBatis配置里，Service方法里取不到值。求解！