在idea中创建maven工程，搭建mybatis环境完成单表增删改查操作，测试,

一.环境说明

1.用到的软件

my sql   idea  maven

2.技术栈

mybatis，maven

二.创建配置项目

1.准备一个数据库，并且存入数据

CREATE TABLE user (
    id INT(10) PRIMARY KEY,
		name VARCHAR(100) NOT NULL,
		pwd VARCHAR(100) NOT NULL
) ENGINE = INNODB DEFAULT CHARSET = utf8 
 
INSERT INTO user VALUES (1, "张三", "123");
INSERT INTO user VALUES (2, "李四", "456");
INSERT INTO user VALUES (3, "王五", "123456");

如图

2.创建一个maven空项目

 

3.删除左侧的src文件夹

 

4.导入依赖，在pom.xml中导入

 

    <dependencies>
	<!--mysql驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.26</version>
        </dependency>
	<!--mybatis-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.7</version>
        </dependency>
	<!--junit-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>7.0.0.8</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

 注意！！以上的版本号改成自己的

然后点击右上角的m刷新

5.防止导入失败，加入以下代码

 

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

6.创建子模块

 

 7.配置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">
<!--核心配置文件-->
<configuration>
 
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.cj.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=true&amp;useUnicode=true&amp;characterEncoding=UTF-8"/>
                <property name="username" value="root"/>
                <property name="password" value="x5"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="com/lyl/dao/UserMapper.xml"/>
    </mappers>
</configuration>

根据自己的数据库，把用户名密码改成自己的，这里使用的是MySQL

3.创建工具类utils

package com.lyl.utils;

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;

public class MybatisUtils {

    private static SqlSessionFactory sqlSessionFactory;
    static {
        try {
            String source = "mybatis-config.xml";
            InputStream inputStream;
            inputStream = Resources.getResourceAsStream(source);
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    // 获取SqlSession
    public static SqlSession getSqlSession() {
        return sqlSessionFactory.openSession();
    }

}

4.创建接口

package com.lyl.dao;


import com.lyl.pojo.User;

import java.util.List;

public interface UserMapper {
    //查询全部用户
    List<UserMapper> getUser();
    //添加用户
    int addUser(User user);
    //修改用户
    int updateUser(User user);
    //删除用户
    int deleteUser(int id);
}

5.测试

package com.lyl.dao;

import com.lyl.pojo.User;
import com.lyl.utils.MybatisUtils;
import org.apache.ibatis.session.SqlSession;
import org.junit.Test;

import java.util.List;

public class MyTest {

    @Test
    public void getUserTest() {
        SqlSession sqlSession = MybatisUtils.getSqlSession();
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        List<UserMapper> user = mapper.getUser();
        System.out.println(user);
        sqlSession.close();
    }
    @Test
    public void addUserTest() {
        SqlSession sqlSession = MybatisUtils.getSqlSession();
        UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
        int res = userMapper.addUser(new User(4,"小乐","321456"));
        System.out.println(res);
        // 提交事务
        sqlSession.commit();
        sqlSession.close();
    }

    @Test
    public void updateUserTest() {
        SqlSession sqlSession = MybatisUtils.getSqlSession();
        UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
        int res  = userMapper.updateUser(new User(4, "小虎", "789654"));
        System.out.println(res);
        sqlSession.commit();
        sqlSession.close();
    }

    @Test
    public void deleteUserTest() {
        SqlSession sqlSession = MybatisUtils.getSqlSession();
        UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
        userMapper.deleteUser(4);
        sqlSession.commit();
        sqlSession.close();
    }

}