Question

Mybatis 的foreach 可以嵌套吗

Answer 1

官方给的test是可以的
<select id="nestedSelect" parameterType="Parameter" resultType="map">
select *
from names
<where>
<foreach collection="names" item="name" separator="or">
<foreach collection="name.firstNames" item="firstName" separator="or">
(lastName = #{name.lastName} and firstName = #{firstName})
</foreach>
</foreach>
</where>
</select>

http://code.google.com/p/mybatis/source/browse/trunk/src/test/java/org/apache/ibatis/submitted/nested/?r=3467

Junit Test
NestedForEachTest.java
NestedForEach.xml

Answer 2

官方给的test是可以的
<select id="nestedSelect" parameterType="Parameter" resultType="map">
select *
from names
<where>
<foreach collection="names" item="name" separator="or">
<foreach collection="name.firstNames" item="firstName" separator="or">
(lastName = #{name.lastName} and firstName = #{firstName})
</foreach>
</foreach>
</where>
</select>

http://code.google.com/p/mybatis/source/browse/trunk/src/test/java/org/apache/ibatis/submitted/nested/?r=3467

Junit Test
NestedForEachTest.java
NestedForEach.xml