mybatis的in查询
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
- <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
- <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);
- <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>