iBatis iterate标签

转自：http://blog.csdn.net/bruce128/article/details/22098795

小结一下ibatis框架下，传入参数为数组类型或者是List类型的sql写法。标签里面都不需要表名

1.传入字符串数组，不需要标明parameterClasss，数组和List类型对象一样都可以用<iterate>标签进行遍历。

<select id="selectOrgIdByNameStr" resultClass="Integer">
SELECT id
FROM org
WHERE name IN
<iterate close=")" open="("  conjunction=",">
<![CDATA[
#[]#
]]>
</iterate>
</select>

@Override
public List<Integer> selectOrgIdByNameStr(String[] orgArchArr) {
return baseDao.queryForList("org.selectOrgIdByNameStr", orgArchArr, Integer.class);
}

2.传入List<Integer>，这个时候parameterClass传的是List接口的类路径，而不是List的泛型参数的类路径！

<select id="searchWaiters" parameterClass="java.util.List" resultClass="com.chat.domain.zone.WaiterCgExt">
SELECT w.id, pin as userName, org_id as orgId, w.name, erp, job_no as jobNo, level, max_csu, gid,cg.name chatGroupName, r.yn groupYn, cg.yn chatGroupYn
FROM waiter w left join waiter_relation r on  w.id = r.wid LEFT JOIN chat_group cg on r.gid = cg.id, org o
WHERE o.id = w.org_id
AND w.yn = 1
AND o.yn = 1
AND w.id IN <iterate open="(" close=")" conjunction=",">
#wid[]#
</iterate>
</select>

@Override
public List<WaiterCgExt> searchWaiters(ModAccManVo vo) {
List<Integer> widList = baseDao.queryForList("zone.waiter.searchWaitersId", vo, Integer.class);
if(CollectionUtils.isEmpty(widList)) {
return new ArrayList<WaiterCgExt>();
}
return baseDao.queryForList("zone.waiter.searchWaiters", widList, WaiterCgExt.class);
}

3.传入的List的元素是复杂的对象类型，类型类型里面包含id属性。同样，parameterClass传入的是List接口的类路径，而不是List的泛型参数的类路径。遍历的时候，用#list[].id#就行了，“.”后面跟上要枚举的属性名称

<select id="selectWaitersByOrgList" resultClass="com.chat.domain.zone.Waiter" parameterClass="java.util.List">
SELECT id, pin as userName
FROM waiter
WHERE org_id IN
<iterate open="(" close=")" conjunction=",">
#list[].id#
</iterate>
AND yn = 1
</select>