mybatis 中使用 in 查询

转：http://www.cnblogs.com/xusir/archive/2013/07/24/3210286.html

当查询的参数只有一个时 

 a 如果参数的类型是List, 则在使用时，collection属性要必须指定为 list

findByIds(List<Long> ids)

<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>

b 如果参数的类型是Array,则在使用时，collection属性要必须指定为 array

findByIds(Long[] ids)

<select id="findByIdsMap" resultMap="BaseResultMap">
                 select
                 <include refid="Base_Column_List" />
          from jria where ID in
                  <foreach item="item" index="index" collection="array" 
                         open="(" separator="," close=")">
                        #{item}
                </foreach>
  </select>

当查询的参数有多个时,例如 findByIds(String name, Long[] ids)

注：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

Map<String, Object> params = new HashMap<String, Object>(2);
        params.put("name", name);
         params.put("ids", ids);
        mapper.findByIdsMap(params);
 
 <select id="findByIdsMap" resultMap="BaseResultMap">
                 select
                 <include refid="Base_Column_List" />
          from jria where ID in
                  <foreach item="item" index="index" collection="ids" 
                         open="(" separator="," close=")">
                        #{item}
                </foreach>
   </select>