一、项目大体结构
二、项目代码
创建表
CREATE TABLE `mysql_sutdy`.`user` (
`id` int NOT NULL AUTO_INCREMENT COMMENT '主键',
`userName` varchar(64) NULL COMMENT '用户姓名',
`password` varchar(64) NULL COMMENT '密码',
`address` varchar(128) NULL COMMENT '地址',
`age` int NULL COMMENT '年级',
`sex` int NULL COMMENT '性别（0：男；1：女；2：未知）',
PRIMARY KEY (`id`)
);
pom文件
<?xml version="1.0" encoding="UTF-8"?>
<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>4.0.0</modelVersion>
<groupId>org.example</groupId>
<artifactId>mybatis_demo1</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.7</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.3</version>
</dependency>
</dependencies>
</project>
实体类
package com.sgh.mybatis.domain;
public class User {
private Integer id;
private String userName;
private String password;
private String address;
private int age;
private int sex;
public User() {
}
public User(String userName, String password, String address, int age, int sex) {
this.userName = userName;
this.password = password;
this.address = address;
this.age = age;
this.sex = sex;
}
public Integer getId() {
return id;
}
public void setId(Integer 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 getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public int getSex() {
return sex;
}
public void setSex(int sex) {
this.sex = sex;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", userName='" + userName + '\'' +
", password='" + password + '\'' +
", address='" + address + '\'' +
", age=" + age +
", sex=" + sex +
'}';
}
}
mapper接口
package com.sgh.mybatis.mappers;
import com.sgh.mybatis.domain.User;
public interface UserMapper {
Integer insertUser(User user);
}
mapperxml文件
<?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="com.sgh.mybatis.mappers.UserMapper">
<insert id="insertUser">
insert into user values(null,'张三','123456','重庆市荣昌区',23,0)
</insert>
</mapper>
mybatis-config文件
<?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="development">
<environment id="development">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://47.99.35.15:3306/mysql_study?characterEncoding=UTF-8"/>
<property name="username" value="root"/>
<property name="password" value="SUGUOHU@1"/>
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="mappers/UserMapper.xml"/>
</mappers>
</configuration>
测试类
package com.sgh.mybatis.mapper;
import com.sgh.mybatis.domain.User;
import com.sgh.mybatis.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 org.junit.Test;
import java.io.IOException;
import java.io.InputStream;
/**
* @author ：suguohu
* @date ：Created in 2022/4/2 17:49
* @description：
* @modified By：
* @version: $
*/
public class UserMapperTest {
@Test
public void testInsertUser() throws IOException {
//读取MyBatis的核心配置文件
InputStream is = Resources.getResourceAsStream("mybatis-config.xml");
//获取SqlSessionFactoryBuilder对象
SqlSessionFactoryBuilder sqlSessionFactoryBuilder = new SqlSessionFactoryBuilder();
//通过核心配置文件所对应的字节输入流创建工厂类SqlSessionFactory，生产SqlSession对象
SqlSessionFactory sqlSessionFactory = sqlSessionFactoryBuilder.build(is);
//获取sqlSession，此时通过SqlSession对象所操作的sql都必须手动提交或回滚事务
//SqlSession sqlSession = sqlSessionFactory.openSession();
//创建SqlSession对象，此时通过SqlSession对象所操作的sql都会自动提交
SqlSession sqlSession = sqlSessionFactory.openSession(true);
//通过代理模式创建UserMapper接口的代理实现类对象
UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
//调用UserMapper接口中的方法，就可以根据UserMapper的全类名匹配元素文件，通过调用的方法名匹配映射文件中的SQL标签，并执行标签中的SQL语句
//TODO 暂时不考虑传参
User user = new User("sgh", "123456", "重庆荣昌", 18, 0);
int result = userMapper.insertUser(user);
//提交事务
//sqlSession.commit();
System.out.println("result:" + result);
}
}
