Xml代码
- 传入一个map的参数,map里有一个tenantIds的List,在xml里先判断这个List的size是否大于o,然后通过foreach
传入一个map的参数,map里有一个tenantIds的List,在xml里先判断这个List的size是否大于o,然后通过foreach
Xml代码
- 构造一个in后面括号里的元素,具体的xml如下:
构造一个in后面括号里的元素,具体的xml如下:
Xml代码
- <if test="tenantIds.size() > 0">
- AND A.PROC_TARGET_ID IN
- <foreach
- collection="tenantIds"
- item="tenantId"
- open="("
- separator=","
- close=")">
- #{tenantId}
- </foreach>
- </if>
<if test="tenantIds.size() > 0"> AND A.PROC_TARGET_ID IN <foreach collection="tenantIds" item="tenantId" open="(" separator="," close=")"> #{tenantId} </foreach> </if>
另一个解决s链接:http://fireinjava.iteye.com/blog/1779420
mybatis官方学习文档:http://www.mybatis.org/core/getting-started.html
本文转自:http://www.blogjava.net/xmatthew/archive/2011/08/31/355879.html
1. 当查询的参数只有一个时
findByIds(List<Long> ids)
1.1 如果参数的类型是List, 则在使用时,collection属性要必须指定为 list
Xml代码
- <select id="findByIdsMap" resultMap="BaseResultMap">
- Select
- <include refid="Base_Column_List" />
- from jria where ID in
- <foreach item="item" index="index" collection="list" open="(" separator="," close=")">
- #{item}
- </foreach>
- </select>
<select id="findByIdsMap" resultMap="BaseResultMap"> Select <include refid="Base_Column_List" /> from jria where ID in <foreach item="item" index="index" collection="list" open="(" separator="," close=")"> #{item} </foreach> </select>
findByIds(Long[] ids)
1.2 如果参数的类型是Array,则在使用时,collection属性要必须指定为 array
Xml代码
- <select id="findByIdsMap" resultMap="BaseResultMap">
- select
- <include refid="Base_Column_List" />
- from tabs where ID in
- <foreach item="item" index="index" collection="array" open="(" separator="," close=")">
- #{item}
- </foreach>
- </select>
<select id="findByIdsMap" resultMap="BaseResultMap"> select <include refid="Base_Column_List" /> from tabs where ID in <foreach item="item" index="index" collection="array" open="(" separator="," close=")"> #{item} </foreach> </select>
2. 当查询的参数有多个时,例如 findByIds(String name, Long[] ids)
这种情况需要特别注意,在传参数时,一定要改用Map方式, 这样在collection属性可以指定名称
下面是一个示例
Map<String, Object> params = new HashMap<String, Object>(2);
params.put("name", name);
params.put("ids", ids);
mapper.findByIdsMap(params);
Xml代码
- <select id="findByIdsMap" resultMap="BaseResultMap">
- select
- <include refid="Base_Column_List" />
- from tabs where ID in
- <foreach item="item" index="index" collection="ids" open="(" separator="," close=")">
- #{item}
- </foreach>
- </select>
<select id="findByIdsMap" resultMap="BaseResultMap"> select <include refid="Base_Column_List" /> from tabs where ID in <foreach item="item" index="index" collection="ids" open="(" separator="," close=")"> #{item} </foreach> </select>