pom文件要加两个依赖

<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
  <groupId>mysql</groupId>
  <artifactId>mysql-connector-java</artifactId>
  <version>5.1.38</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
<dependency>
  <groupId>org.mybatis</groupId>
  <artifactId>mybatis</artifactId>
  <version>3.4.6</version>
</dependency>

新建Resource文件–>新建两个配置文件mybatis.cfg.xml和local.xml
mybatis.cfg.xml配置文件：

<?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>
<!-- 如参数属性是一个类，可以给长的类名取别名 -->
    <typeAliases>
        <typeAlias type="com.bdqn.entity.Local" alias="local"></typeAlias>
    </typeAliases>
    <environments default="zjy">
        <environment id="zjy">
            <transactionManager type="JDBC"></transactionManager>
            <!-- 配置数据库连接信息 -->
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://192.168.181.129:3306/myshops"/>
                <property name="username" value="root"/>
                <property name="password" value="kb10"/>
            </dataSource>
        </environment>
    </environments>
     <mappers>
     <!--关联两个配置文件-->
        <mapper resource="mappers/local.xml"></mapper>
    </mappers>
</configuration>

local.xml配置文件：sql语句

<?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.bdnq.dao.localDAO">
    <insert id="insertLocal" parameterType="local">
        insert into local values(#{localid},#{localname},#{sublocal})
    </insert>
    <delete id="deleteLocal" parameterType="int">
        delete from local where localid=#{localid}
    </delete>

    <update id="updateLocal" parameterType="local">
        update local set localname=#{localname} ,sublocal=#{sublocal} where localid=#{lcoalid}
    </update>
    <select id="findAll" resultType="local">
        select * from local
    </select>
    <select id="findById" parameterType="int" resultType="local">
        select * from local where localid=#{localid}
    </select>
</mapper>

设置parameterType：防止有同名的重载方法

JAVA实体类：

package com.bdqn.entity;

public class Local {
    private int localid;
    private String localname;
    private int sublocal;


    public int getLocalid() {
        return localid;
    }

    public void setLocalid(int localid) {
        this.localid = localid;
    }

    public String getLocalname() {
        return localname;
    }

    public void setLocalname(String localname) {
        this.localname = localname;
    }

    public int getSublocal() {
        return sublocal;
    }

    public void setSublocal(int sublocal) {
        this.sublocal = sublocal;
    }
}

接口

package com.bdnq.dao;

import com.bdqn.entity.Local;

import java.util.List;

public interface localDAO {
    public void insertLocal(Local local);
    public void deleteLocal(int localid);
    public void updateLocal(Local local);
    public List<Local> findAll();
    public Local findById(int localid);



}

测试类：

package com.bdqn.entity;

import com.bdnq.dao.localDAO;
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.Reader;

public class MyTest {
    public static void main(String[] args) throws IOException {
        //读取配置文件
        Reader reader = Resources.getResourceAsReader("mybatis.cfg.xml");
       //根据配置获得数据库操作会话工厂
        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(reader);
        //根据操作工厂生产操作会话
        SqlSession session = factory.openSession();
        //根据会话生成对应的数据库操作实例
        localDAO ldao = session.getMapper(localDAO.class);
        //操作接口，测试效果
//        System.out.println(ldao.findAll());
//        System.out.println(ldao.findById(2).getLocalname());
        //开启事务,添加数据
        Local loc = new Local();
//        loc.setLocalid(21);
//        loc.setLocalname("扬州");
//        loc.setSublocal(2);
//        ldao.insertLocal(loc);
//        session.commit();
        //修改数据
//        loc.setLocalid(21);
//        loc.setLocalname("南通");
//        loc.setSublocal(2);
//        ldao.updateLocal(loc);

        //删除数据
        ldao.deleteLocal(21);
        session.commit();
        //关闭接口
        session.close();

    }
}