mybatis 中foreach的三种遍历
- 各参数解释
collection :collection属性的值有三个分别是list、array、map三种,分别对应的参数类型为:List、数组、map集合,我在上面传的参数为数组,所以值为array
item : 表示在迭代过程中每一个元素的别名
index :表示在迭代过程中每次迭代到的位置(下标)
open :前缀
close :后缀
separator :分隔符,表示迭代时每个元素之间以什么分隔 - 数组
int[] ids = {1,2,3,4,5}
<select id="getTeam" parameterType="java.util.arraylist" resultType="Team">
<foreach collection="array" index="index" item="item" open="(" separator="," close=")">
#{item}
</foreach>
</select>
3 .Map
<select id="getTeam" parameterType="java.util.HashMap" resultType="Team">
select * from team where title like "%"#{name}"%" and id in
<foreach collection="keys" index="index" item="item" open="(" separator="," close=")">
#{item}
</foreach>
</select>
4 .List
<select id="getTeam" parameterType="java.util.List" resultType="Team">
select * from team where id in
<foreach collection="list" index="index" item="item" open="(" separator="," close=")">
#{item}
</foreach>
</select>