详解Mybatis（五）Mapper接口

<?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"><!-- 为这个mapper指定一个唯一的namespace，namespace的值习惯上设置成包名+sql映射文件名，这样就能够保证namespace的值是唯一的例如namespace="me.gacl.mapping.userMapper"就是me.gacl.mapping(包名)+userMapper(userMapper.xml文件去除后缀) --><mapper namespace="Mybatis.domain.Mapper.UserMapper">  <resultMap type="User" id="BaseResultMap">  	<result column="t_id" property="id"/>  	<result column="t_name" property="name"/>  	<result column="t_salary" property="salary"/>  </resultMap>    <!-- 保存操作 -->  <insert id="save" useGeneratedKeys="true" keyProperty="id">	  INSERT INTO t_user (name , salary) 	VALUES (#{name},#{salary}) 	  </insert>    <!-- 更改操作 -->  <update id="update">  	update t_user where name=#{name},salary=#{salary} where id=#{id}  </update>    <!-- 删除操作 -->  <delete id="delete" >  	delete from t_user where id=#{id}  </delete>    <!-- 查询单个操作 -->   <select id="select" parameterMap="java.lang.Long" resultType="Mybatis.domain.User">    select * from t_user where id = #{id}  </select>	<!-- 查询多个操作 -->	<select id="selectAll" resultType="User">		select id,name,salary from t_user	</select>  </mapper>

import java.util.List;import Mybatis.domain.User;public interface UserMapper {	void save(User u);		void update(User u);		void delete(Long id);		User select(User u);		List<User> selectAll();}