Mapper代理开发

Mapper代理开发

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1. 创建数据库

mysql -uroot -p1234
create database mybatis;
use mybatis;

drop table if exists tb_user;

create table tb_user(
	id int primary key auto_increment,
	username varchar(20),
	password varchar(20),
	gender char(1),
	addr varchar(30)
);

INSERT INTO tb_user VALUES (1, '张三', '123', '男', '北京');
INSERT INTO tb_user VALUES (2, '李四', '234', '女', '天津');
INSERT INTO tb_user VALUES (3, '王五', '11', '男', '西安');

select * from tb_user;

2. 新建项目模块

• Name：myBatisDemo
• Language：Java
• Build System： Maven
• JDK：选默认的
• Parent：
• Advanced Settings
  • Groupld：org.example
  • Artifactld：untitiled
    

3. 项目文件创建 3.1 logbak.xml日志文件

• 在src/main/resources路径下右键新建logback.xml文件，代码如下：

<configuration>
    
    <appender name="Console" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>[%level] %blue(%d{HH:mm:ss.SSS}) %cyan([%thread]) %boldGreen(%logger{15}) - %msg %npattern>
        encoder>
    appender>

    <logger name="com.itheima" level="DEBUG" additivity="false">
        <appender-ref ref="Console"/>
    logger>
    
    <root level="DEBUG">
        <appender-ref ref="Console"/>
    root>
configuration>

3.2 pom.xml

• 编辑pom.xml文件，导入依赖包

<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0modelVersion>

    <groupId>org.examplegroupId>
    <artifactId>myBatisDemoartifactId>
    <version>1.0-SNAPSHOTversion>

    <properties>
        <maven.compiler.source>17maven.compiler.source>
        <maven.compiler.target>17maven.compiler.target>
    properties>

    <dependencies>

        
        <dependency>
            <groupId>org.mybatisgroupId>
            <artifactId>mybatisartifactId>
            <version>3.5.9version>
        dependency>
        
        <dependency>
            <groupId>mysqlgroupId>
            <artifactId>mysql-connector-javaartifactId>
            <version>5.1.32version>
        dependency>

        <dependency>
            <groupId>junitgroupId>
            <artifactId>junitartifactId>
            <version>4.13version>
            <scope>testscope>
        dependency>

        
        <dependency>
            <groupId>org.slf4jgroupId>
            <artifactId>slf4j-apiartifactId>
            <version>1.7.20version>
        dependency>
        
        <dependency>
            <groupId>ch.qos.logbackgroupId>
            <artifactId>logback-classicartifactId>
            <version>1.2.3version>
        dependency>
        
        <dependency>
            <groupId>ch.qos.logbackgroupId>
            <artifactId>logback-coreartifactId>
            <version>1.2.3version>
        dependency>
    dependencies>
project>

3.3 创建pojo对象User

• 在src/main/java下右键新建java class文件：pojo.User
• 声明成员变量

	 private int id ;
	 private String username ;
	 private String password ;
	 private String gender ;
	 private String addr;

• 为成员变量添加geter/seter方法

public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public String getAddr() {
        return addr;
    }

    public void setAddr(String addr) {
        this.addr = addr;
    }

• 添加toString()方法

 @Override
    public String toString() {
        return "User{" +
                "id='" + id + '\'' +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                ", gender='" + gender + '\'' +
                ", addr='" + addr + '\'' +
                '}';
    }

3.4 UserMapper接口类

• 在src/main/java下右键新建com.mappers.UserMapper接口类
• 为接口添加selectAll()方法，并用List接收

package com.mappers;
import pojo.User;
import java.util.List;
public interface UserMapper {
    List<User> selectAll();
}

3.5 mybatis核心配置文件

• 在src/main/resources下右键 --> 新建File：mybatis-config.xml
• 配置mybatis-config.xml核心配置文件

DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">

<configuration>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql:///myBatis?useSSL=false"/>
                <property name="username" value="root"/>
                <property name="password" value="1234"/>
            dataSource>
        environment>
    environments>

    <mappers>
        <package name="com.mappers"/>
    mappers>
configuration>

3.6 UserMapper数据库映射文件

• 在src/main/resources下右键 --> 新建File：com/mappers/UserMapper.xml
• 编写UserMapper.xml代码：

DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.mappers.UserMapper">
    <select id="selectAll" resultType="pojo.User">
        select * from tb_user;
    select>
mapper>

3.7 创建测试主程序

• 在src/main/java下右键新建java class文件：MyBatisTest
• 编写主程序代码

import com.mappers.UserMapper;
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 pojo.User;

import java.io.IOException;
import java.io.InputStream;
import java.util.List;

public class MyBatisTest {
    public static void main(String[] args) throws IOException {
        // 1. 加载mybatis的核心配置文件，获取SqlSessionFactory
        String resource = "mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);

        // 2.获取SqlSession对象，用它来执行sql
        SqlSession sqlSession = sqlSessionFactory.openSession();

        // 3. 获取UserMapper接口的代理对象
        UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
        
        // 4. 执行sql
        List<User> users = userMapper.selectAll();
        
        // 5. 打印输出
        System.out.println(users);

        // 6. 释放资源
        sqlSession.close();
    }
}

3.8. 测试结果