本文轉自:http://www.blogjava.net/xmatthew/archive/2011/08/31/355879.html
1. 當查詢的參數只有一個時
findByIds(List<Long> ids)
1.1 如果參數的類型是List, 則在使用時,collection屬性要必須指定為 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 如果參數的類型是Array,則在使用時,collection屬性要必須指定為 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. 當查詢的參數有多個時,例如 findByIds(String name, Long[] ids)
這種情況需要特別注意,在傳參數時,一定要改用Map方式, 這樣在collection屬性可以指定名稱
下面是一個示例
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>
mybatis官方學習文檔:http://www.mybatis.org/core/getting-started.html