MyBatis 推薦的傳參方式
如果要詳細的學習 MyBatis,推薦看這個教程:https://www.w3cschool.cn/mybatis/
1. 單個參數
//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. 多個參數
//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. 數組參數
//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參數
//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>