推荐的MyBatis传参方式List数组等

Posted 2020-10-20

MyBatis 推荐的传参方式

如果要详细的学习 MyBatis，推荐看这个教程：https://www.w3cschool.cn/mybatis/

1. 单个参数

//接口方法
int getAgeById(Integer id);
//xml映射文件
<select id="getAgeById" resultType="Integer">
    select age from user where user_id = #{id}
</select>

2. 多个参数

//接口方法
 User login(@Param("username") String username, @Param("password") String password);
 //xml映射文件
 <select id="login" resultMap="BaseResultMap">
    select
    *
    from user
    where username = #{username} and password = #{password}
</select>

3. 数组参数

//接口方法
ArrayList<User> selectByIds(Integer [] ids);
//xml映射文件
<select id="selectByIds" resultMap="BaseResultMap">
    select
    *
    from user where id in
    <foreach item="item" index="index" collection="array" open="(" separator="," close=")">
        #{item}
    </foreach>
</select>

4.List参数

//接口方法
ArrayList<User> selectByIds(List<Integer> ids);
//xml映射文件
<select id="selectByIds" resultMap="BaseResultMap">
    Select
    <include refid="Base_Column_List" />
    from jria where ID in
    <foreach item="item" index="index" collection="list" open="(" separator="," close=")">
          #{item}
      </foreach>
  </select>