mybatis 中 foreach的用法
阿新 • • 發佈:2018-12-23
在mybatis(mybatis-3.4.5)的官方文件中,給了僅僅這麼一個例子:
<select id="selectPostIn" resultType="domain.blog.Post">
SELECT *
FROM POST P
WHERE ID in
<foreach item="item" index="index" collection="list"
open="(" separator="," close=")">
#{item}
</foreach>
</select>
這裡的collection可以是:array,list,map,set,這裡試驗一下array:
1)準備資料
2)一次性刪去幾個資料
a)對映檔案
<delete id="deleteUser">
delete from t_user where id in
<foreach collection="array" item="id" open="(" close=")" separator=",">
#{id}
</foreach>
</delete>
b)java程式碼
SqlSession session=null; try { session=myBatisUtil.getSqlSession(); Integer[] ids = new Integer[]{1,3,4,5}; session.delete("deleteUser",ids); session.commit(); } catch (Exception e) { e.printStackTrace(); session.rollback(); }finally{ session.close(); }
3)結果:
2018-09-30 15:33:02 DEBUG x.y.z.deleteUser:159 - ==> Preparing: delete from t_user where id in ( ? , ? , ? , ? , ? ) 2018-09-30 15:33:02 DEBUG x.y.z.deleteUser:159 - ==> Parameters: 1(Integer), 3(Integer), 4(Integer), 5(Integer), 8(Integer) 2018-09-30 15:33:02 DEBUG x.y.z.deleteUser:159 - <== Updates: 4
4)查下資料: