pojo层

package com.hnzj.pojo;

public class User {

    private int id;
    private String name;
    private String pwd;

    public User() {
    }

    public User(int id, String name, String pwd) {
        this.id = id;
        this.name = name;
        this.pwd = pwd;
    }

    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 String getPwd() {
        return pwd;
    }

    public void setPwd(String pwd) {
        this.pwd = pwd;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", pwd='" + pwd + '\'' +
                '}';
    }
}

dao层

package com.hnzj.dao;

import com.hnzj.pojo.User;

import java.util.List;
import java.util.Map;

public interface UserMapper {
    //查询所有用户
    List<User> getUserList();
    //根据指定id查询用户
    User getUserById(int id);
    //增
    int addUser(User user);

    int addUser2(Map<String,Object> map);
    //删
    int deleteUser(int id);
    //改
    int updateUser(User user);



}

<?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.hnzj.dao.UserMapper">
    <select id="getUserList" resultType="Userbieming">
        select *
        from mybatis.user
    </select>

    <select id="getUserById" parameterType="int" resultType="com.hnzj.pojo.User">
        select *
        from mybatis.user
        where id=#{id}
    </select>
    
    <insert id="addUser" parameterType="com.hnzj.pojo.User">
        insert into mybatis.user (id,name,pwd)
        values (#{id},#{name},#{pwd})
    </insert>

    <insert id="addUser2" parameterType="map">
        insert into mybatis.user (id,pwd)
        values (#{userid},#{passsWord})
    </insert>

    <update id="updateUser" parameterType="com.hnzj.pojo.User">
        update mybatis.user set name=#{name},pwd=#{pwd} where id=#{id}
    </update>

    <delete id="deleteUser" parameterType="int">
        delete from mybatis.user
        where id=#{id}
    </delete>
</mapper>

driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/mybatis?serverTimezone=UTC
username=****
password=*****

<?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>
    <properties resource="db.properties"/>

    <typeAliases>
        <typeAlias type="com.hnzj.pojo.User" alias="Userbieming"></typeAlias>
    </typeAliases>

    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="${driver}"/>
                <property name="url" value="${url}"/>
                <property name="username" value="${username}"/>
                <property name="password" value="${password}"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="com/hnzj/dao/UserMapper.xml"/>
    </mappers>
</configuration>

测试类

package com.hnzj.dao;

import com.hnzj.pojo.User;
import com.hnzj.util.MybatisUtis;
import org.apache.ibatis.session.SqlSession;
import org.junit.Test;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class UserDaoTest {

    @Test
    public void test01(){
        //1、获取1SqlSession对象
        SqlSession sqlSession = MybatisUtis.getSqlSession();
        //2、得到Mapper
        UserMapper userDao = sqlSession.getMapper(UserMapper.class);
        List<User> userList = userDao.getUserList();

        for (User user:userList){
            System.out.println(user);
        }

        //关闭sqlSession
        sqlSession.close();
    }

    @Test
    public void test02(){
        SqlSession sqlSession = MybatisUtis.getSqlSession();
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        User userById = mapper.getUserById(2);
        System.out.println(userById);
    }

    @Test
    public void test03(){
        SqlSession sqlSession = MybatisUtis.getSqlSession();
        Object mapper = sqlSession.getMapper(UserMapper.class);
        ((UserMapper) mapper).addUser(new User(4,"哈哈","12345"));
        //提交事务，增删改都要提交
        sqlSession.commit();
        sqlSession.close();
        
    }

    @Test
    public void test032(){
        SqlSession sqlSession = MybatisUtis.getSqlSession();
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        Map<String, Object> map = new HashMap<>();
        map.put("userid",7);
        map.put("passsWord","2222333");

        mapper.addUser2(map);
        sqlSession.commit();
        sqlSession.close();

    }

    @Test
    public void test04(){
        SqlSession sqlSession = MybatisUtis.getSqlSession();
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        mapper.updateUser(new User(4,"呵呵","123456"));
        sqlSession.commit();
        sqlSession.close();
    }
    @Test
    public void test05(){
        SqlSession sqlSession = MybatisUtis.getSqlSession();
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        mapper.deleteUser(2);

        sqlSession.commit();
        sqlSession.close();

    }
}

util类

package com.hnzj.util;

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;

//sqlSessionFactory ----》sqlSession
public class MybatisUtis {

    private static SqlSessionFactory sqlSessionFactory;

    static{

        try {
            //使用mybatis获取sqlSessionFactory对象
            String resource = "mybatis-config.xml";
            InputStream inputStream = Resources.getResourceAsStream(resource);
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    //既然有了 SqlSessionFactory，顾名思义，我们可以从中获得 SqlSession 的实例。
    // SqlSession 提供了在数据库执行 SQL 命令所需的所有方法
    public static SqlSession getSqlSession(){
        return sqlSessionFactory.openSession();
    }
}

数据库

pom.xml

<?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">
    <parent>
        <artifactId>Mybatis-Study</artifactId>
        <groupId>com.hnzj.javaee</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>mybatis-01</artifactId>
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <properties>
        <maven.compiler.source>15</maven.compiler.source>
        <maven.compiler.target>15</maven.compiler.target>
    </properties>


    <!--在build中配置resources，来防止我们资源导出失败的问题-->
    <build>
        <resources>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>true</filtering>
            </resource>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>true</filtering>
            </resource>
        </resources>
    </build>

</project>