mybatis使用mapper代理

mybatis使用mapper代理

1.项目目录：

                  

2.mybatis-config.xml配置

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
 PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
 "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
	<environments default="users">
		<environment id="users">
			<transactionManager type="JDBC" />
			<dataSource type="POOLED">
				<property name="driver" value="com.mysql.jdbc.Driver" />
				<property name="url" value="jdbc:mysql://localhost:3306/test" />
				<property name="username" value="root" />
				<property name="password" value="19960215" />
			</dataSource>
		</environment>
	</environments>
	<!-- 将我们写好的sql映射文件（EmployeeMapper.xml）一定要注册到全局配置文件（mybatis-config.xml）中 -->
	<mappers>
		<mapper resource="User.xml" />
	</mappers>
</configuration>

3.log4j.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
 
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
 
 <appender name="STDOUT" class="org.apache.log4j.ConsoleAppender">
   <param name="Encoding" value="UTF-8" />
   <layout class="org.apache.log4j.PatternLayout">
    <param name="ConversionPattern" value="%-5p %d{MM-dd HH:mm:ss,SSS} %m  (%F:%L) \n" />
   </layout>
 </appender>
 <logger name="java.sql">
   <level value="debug" />
 </logger>
 <logger name="org.apache.ibatis">
   <level value="info" />
 </logger>
 <root>
   <level value="debug" />
   <appender-ref ref="STDOUT" />
 </root>
</log4j:configuration>

4.User.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">
<mapper namespace="club.jiajiajia.mybatis.dao.UserDao">
	<!-- 查询单个数据 -->
	<select id="getUser" parameterType="string" resultType="club.jiajiajia.mybatis.entity.User">
		select * from users where email = #{email}
	</select>
	<!-- 查询多个数据（模糊查询） -->
	<select id="getUserByName" parameterType="string" resultType="club.jiajiajia.mybatis.entity.User">
		select * from users where username like #{value}
	</select>
	
	<!-- 添加数据 -->
	<insert id="insertUser" parameterType="club.jiajiajia.mybatis.entity.User">
		insert into users(email,username,password,sex) value(#{email},#{userName},#{password},#{sex})
	</insert>
	
	<!-- 删除数据 -->
	<insert id="delUserByEmail" parameterType="string">
		delete from users where email=#{value}
	</insert>
	
	<!-- 更新数据 -->
	<insert id="updateUserByEmail" parameterType="club.jiajiajia.mybatis.entity.User">
		update users set sex=#{sex} where email=#{email} 
	</insert>
	
	
</mapper>

5.UserDao.java

package club.jiajiajia.mybatis.dao;

import java.util.List;

import club.jiajiajia.mybatis.entity.User;

public interface UserDao{
	public User getUser(String email);
	public List<User> getUserByName(String name);
	public void delUserByEmail(String email);
	public void updateUserByEmail(String email);
	public void insertUser(User user);
}

User.java

package club.jiajiajia.mybatis.entity;

public class User {
	private String email;
	private String userName;
	private String password;
	private String sex;
	public String getUserName() {
		return userName;
	}
	public void setUserName(String userName) {
		this.userName = userName;
	}
	public String getEmail() {
		return email;
	}
	public void setEmail(String email) {
		this.email = email;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	public String getSex() {
		return sex;
	}
	public void setSex(String sex) {
		this.sex = sex;
	}
	public User(String email, String userName, String password, String sex) {
		super();
		this.email = email;
		this.userName = userName;
		this.password = password;
		this.sex = sex;
	}
	@Override
	public String toString() {
		return "User [userName=" + userName + ", password=" + password + ", email=" + email + ", sex=" + sex + "]";
	}
}

7.MybatisTest.java

package club.jiajiajia.mybatis.test;


import java.io.IOException;
import java.io.InputStream;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;

import club.jiajiajia.mybatis.dao.UserDao;

public class MybatisTest {

	public SqlSessionFactory getSqlSessionFactory() throws IOException {
		String resource = "mybatis-config.xml";
		InputStream inputStream = Resources.getResourceAsStream(resource);
		return new SqlSessionFactoryBuilder().build(inputStream);
	}
	@Test
	public void test() throws IOException {
		SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();
		SqlSession session=sqlSessionFactory.openSession();
		//测试
		UserDao userdao=session.getMapper(UserDao.class);
		System.out.println(userdao.getUser("123@163.com"));
	}
	
}

**************************************
.xml配置
1.namespace等于mapper接口的全类名
2.接口中的方法名和sql标签中的id相同
3.返回值的类型要对应

4.参数类型要对应