5.通过参数注解多个接口参数的用法

一、参数注解

遇到多个参数，因为不能因为两三个参数去创建新的JavaBean类，对于参数比较少的情况下可以使用@Param注解。

UserMapper.java

package tk.mybatis.simple.mapper;

import org.apache.ibatis.annotations.Param;
import tk.mybatis.simple.model.SysRole;
import tk.mybatis.simple.model.SysUser;

import java.util.List;

/**
 * @author weihu
 * @date 2018/8/3/003 0:01
 */
public interface UserMapper {


    /**
     * 根据用户id和角色的enabled状态获取用户的角色
     */
    List<SysRole> selectRolesByUserIdAndRoleEnabled(@Param("userId") Long userId,@Param("enabled") Integer enabled);
}

UserMapper.xml

<?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">
<!--sql语句映射文件-->

<!--因为已经配置了别名,所以resultType可以直接写类名,没有配置的话就要写类全名-->
<mapper namespace="tk.mybatis.simple.mapper.UserMapper">

    <select id="selectRolesByUserIdAndRoleEnabled" resultType="tk.mybatis.simple.model.SysRole">
        select
        r.id,
        r.role_name roleName,
        r.enabled,
        r.create_by createBy,
        r.create_time createTime
        from sys_user u
        inner join sys_user_role ur on u.id=ur.user_id
        inner join sys_role r on ur.role_id=r.id
        where u.id=#{userId} and r.enabled=#{enabled}

    </select>
</mapper>

UserMapperTest.java

package tk.mybatis.simple.mapper;

import org.apache.ibatis.session.SqlSession;
import org.junit.Assert;
import org.junit.Test;
import tk.mybatis.simple.model.SysRole;
import tk.mybatis.simple.model.SysUser;

import java.util.Date;
import java.util.List;

/**
 * @author weihu
 * @date 2018/8/5/005 9:34
 * @desc
 */
public class UserMapperTest extends BaseMapperTest {

 

    public void testParam(){
        SqlSession sqlSession = getSqlSession();
        try {
            UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
            List<SysRole> sysRoles = userMapper.selectRolesByUserIdAndRoleEnabled(1L, 1);
            System.out.println(sysRoles);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            sqlSession.close();
        }

    }
}