spring 极简集成mybatis

maven项目

pom

<?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>com.shrimpking</groupId>
    <artifactId>demo3</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.14</version>
        </dependency>
    </dependencies>
</project>

user

package com.shrimpking.pojo;

/**
 * Created by IntelliJ IDEA.
 *
 * @Author : Shrimpking
 * @create 2024/1/30 21:24
 */
public class User
{
    private Integer id;

    private String username;

    private String jobs;

    private String phone;

    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 getJobs()
    {
        return jobs;
    }

    public void setJobs(String jobs)
    {
        this.jobs = jobs;
    }

    public String getPhone()
    {
        return phone;
    }

    public void setPhone(String phone)
    {
        this.phone = phone;
    }

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

    public User()
    {
    }

    public User(String username, String jobs, String phone)
    {
        this.username = username;
        this.jobs = jobs;
        this.phone = phone;
    }
}

userMapper

package com.shrimpking.mapper;

import com.shrimpking.pojo.User;

import java.util.List;

/**
 * Created by IntelliJ IDEA.
 *
 * @Author : Shrimpking
 * @create 2024/1/30 21:28
 */
public interface UserMapper
{
    List<User> findAll();
}

userMapper.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="com.shrimpking.mapper.UserMapper">

    <select id="findAll" resultType="com.shrimpking.pojo.User">
        select * from a_user
    </select>
</mapper>

mybatis-config.xml

<?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://localhost:3306/test?useUnicode=true&amp;characterEncoding=utf-8&amp;useSSL=false&amp;serverTimeZone=UTC"/>
                <property name="username" value="root"/>
                <property name="password" value="mysql123"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <package name="com.shrimpking.mapper"/>
    </mappers>
</configuration>

test

package com.shrimpking;

import com.shrimpking.mapper.UserMapper;
import com.shrimpking.pojo.User;
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 java.io.IOException;
import java.io.InputStream;
import java.util.List;

/**
 * Created by IntelliJ IDEA.
 *
 * @Author : Shrimpking
 * @create 2024/1/30 21:30
 */
public class MybatisTest
{
    public static void main(String[] args) throws Exception
    {
        InputStream input = Resources.getResourceAsStream("mybatis-config.xml");
        SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();
        SqlSessionFactory sqlSessionFactory = builder.build(input);
        SqlSession sqlSession = sqlSessionFactory.openSession();
        UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
        List<User> all = userMapper.findAll();
        for (User user : all)
        {
            System.out.println(user);
        }
    }
}

数据库表