使用mybatis框架连接mysql数据库的超详细步骤

 <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.45</version>
        </dependency>

<dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.6</version>
        </dependency>

<?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>demo2</artifactId>
    <version>1.0-SNAPSHOT</version>
 
    <properties>
        <maven.compiler.source>17</maven.compiler.source>
        <maven.compiler.target>17</maven.compiler.target>
    </properties>
 
    <dependencies>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.45</version>
        </dependency>
 
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.6</version>
        </dependency>
    </dependencies>
</project>

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "https://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
<!--            这里要写入我们连接mysql数据库的信息-->
            <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="1234"/>
            </dataSource>
        </environment>
    </environments>
<!--    这里要写sql映射-->
    <mappers>
        <mapper resource="com/kinroy/Mapper/userMapper.xml"/>
    </mappers>
</configuration>

package com.kinroy.pojo;
 
public class User {
    private int id;
    private String name;
    private int age;
 
    public User() {
    }
 
    public User(int id, String name, int age) {
        this.id = id;
        this.name = name;
        this.age = age;
    }
 
    
    public int getId() {
        return id;
    }
 
    
    public void setId(int id) {
        this.id = id;
    }
 
    
    public String getName() {
        return name;
    }
 
    
    public void setName(String name) {
        this.name = name;
    }
 
    
    public int getAge() {
        return age;
    }
 
    
    public void setAge(int age) {
        this.age = age;
    }
 
    public String toString() {
        return "User{id = " + id + ", name = " + name + ", age = " + age + "}";
    }
}

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "https://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.kinroy.Mapper.userMapper">
 
    <select id="selectall" resultType="com.kinroy.pojo.User">
        select * from user;
    </select>
    <select id="selectzhangsan" resultType="com.kinroy.pojo.User">
       select * from user where name='张三';
 
    </select>
 
</mapper>

package com.kinroy.Mapper;
 
import com.kinroy.pojo.User;
 
import java.util.List;
 
public interface userMapper {
    List<User> selectall();
    User selectzhangsan();
}

import com.kinroy.Mapper.userMapper;
import com.kinroy.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;
 
public class test {
    public static void main(String[] args) throws IOException {
        String resource = "Mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        SqlSession sqlSession = sqlSessionFactory.openSession();
        userMapper users = sqlSession.getMapper(userMapper.class);
        
        User zhangsan = users.selectzhangsan();
        String s = zhangsan.toString();
        System.out.println(s);
 
    }
}