吃饭先喝汤，不用请药方——佚名
之前写了mybatis中@One
今天写个@Many的
首先还是代码：
代码语言：javascript复制package com.ruben.mapper;
import com.ruben.pojo.po.UserInfo;
import org.apache.ibatis.annotations.*;
import org.apache.ibatis.cursor.Cursor;
import org.apache.ibatis.session.RowBounds;
import java.util.List;
@Mapper
public interface UserMapper {
@Select("SELECT * FROM user_info")
@Results({
@Result(column = "id", property = "id"),
@Result(column = "name", property = "name"),
@Result(column = "age", property = "age"),
@Result(column = "email", property = "email"),
@Result(property = "userRoles", javaType = List.class, column = "userRole.userId = id",
many = @Many(select = "com.ruben.mapper.UserRoleMapper.selectListCursor"))
})
List<UserInfo> selectList(RowBounds rowBounds);
}这里的UserRoleMapper.selectListCursor还是没动，感觉这里不应该是userRole.userId，直接使用userId、roleId会更好
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.ruben.mapper.UserRoleMapper">
<resultMap id="userRole" type="com.ruben.pojo.po.UserRole">
<result column="id" property="id"/>
<result column="user_id" property="userId"/>
<result column="role_id" property="roleId"/>
<association property="role"
column="id = role_id"
javaType="com.ruben.pojo.po.RoleInfo"
select="com.ruben.mapper.RoleMapper.getById"
fetchType="lazy"/>
</resultMap>
<select id="selectListCursor" resultMap="userRole">
select *
from user_role
<where>
<if test="userRole.userId != null">
AND user_id = #{userRole.userId}
</if>
<if test="userRole.roleId != null">
AND role_id = #{userRole.roleId}
</if>
</where>
</select>
</mapper>然后结合之前的代码，这里写个单元测试：
代码语言：javascript复制@Test
void testMany(@Autowired UserMapper userMapper) {
List<UserInfo> users = userMapper.selectList(new RowBounds(0, 5));
Assertions.assertEquals("admin", users.get(0).getUserRoles().get(0).getRole().getRoleName());
Assertions.assertEquals("user", users.get(0).getUserRoles().get(1).getRole().getRoleName());
}运行结果：
