使用springboot整合mybatis

网友投稿 234 2022-10-27


使用springboot整合mybatis

1、准备数据库中的表及表中的数据

/*

SQLyog Ultimate v12.09 (64 bit)

mysql - 5.6.11 : Database - mp

*********************************************************************

*/

/*!40101 SET NAMES utf8 */;

/*!40101 SET SQL_MODE=''*/;

/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;

/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;

/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;

/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;

CREATE DATABASE /*!32312 IF NOT EXISTS*/`mp` /*!40100 DEFAULT CHARACTER SET utf8 */;

USE `mp`;

/*Table structure for table `tbl_employee` */

DROP TABLE IF EXISTS `tbl_employee`;

CREATE TABLE `tbl_employee` (

`id` int(11) NOT NULL AUTO_INCREMENT,

`last_name` varchar(50) DEFAULT NULL,

`email` varchar(50) DEFAULT NULL,

`gender` char(1) DEFAULT NULL,

`age` int(11) DEFAULT NULL,

`version` int(11) DEFAULT NULL,

PRIMARY KEY (`id`)

) ENGINE=InnoDB AUTO_INCREMENT=24 DEFAULT CHARSET=utf8;

/*Data for the table `tbl_employee` */

insert into `tbl_employee`(`id`,`last_name`,`email`,`gender`,`age`,`version`) values (1,'Tom','tom@zou.com','1',22,1),(2,'Jerry','jerry@zou.com','0',25,1),(3,'Black','black@zou.com','1',30,1),(4,'White','white@zou.com','0',35,1),(14,'小邹','com@hq.cn','0',19,1),(18,'jack','mp@zou.com','1',22,1),(22,'abc','123@qq.com','1',23,2);

/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;

/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;

/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;

/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;

2、初始化一个springboot项目

如何初始化一个springboot项目?

点击https://blog.csdn.net/Zou_05/article/details/115869941

注:勾选YWIIgCBrLombok插件,简化开发

3、在pom.xml中加入mybatis-plus及mysql数据库的依赖

com.baomidou

mybatis-plus-boot-starter

3.4.2

mysql

mysql-connector-java

6.0.5

com.alibaba

druid

1.1.10

4、将application.properties文件修改为application.yml,并添加mysql数据库的连接信息(mp为我的数据库名)

server:

port: 8081

servlet:

context-path: /

spring:

datasource:

username: root

password: 123456

url: jdbc:mysql://localhost:3306/mp?useUnicode=true&characterEncoding=utf-8&useSSL=true&serverTimezone=UTC

type: com.alibaba.druid.pool.DruidDataSource

driver-class-name: com.mysql.cj.jdbc.Driver

5、编写实体类(使用lombok简化代码)

@TableName指定数据库的表名

@TableId(type = IdType.AUTO)指定id为自增

package com.zou.demo1.entity;

import com.baomidou.mybatisplus.annotation.IdType;

import com.baomidou.mybatisplus.annotation.TableId;

import com.baomidou.mybatisplus.annotation.TableName;

import com.baomidou.mybatisplus.annotation.Version;

import lombok.Data;

/**

* @author: 邹祥发

* @date: 2021/4/21 08:49

*/

@Data

@TableName("tbl_employee")

public class User {

@TableId(type = IdType.AUTO)

private Integer id;

private String lastName;

private String email;

private Integer gender;

private Integer age;

@Version

private Integer version;

}

6、编写Mapper类

package com.zou.demo1.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;

import com.zou.demo1.entity.User;

/**

* @author: 邹祥发

* @date: 2021/4/21 08:55

*/

public interface UserMapper extends BaseMapper {

}

7、因测试需要加入一些依赖,完整的pom.xml如下:

xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">

4.0.0

org.springframework.boot

spring-boot-starter-parent

2.4.5

com.zou

demo1

0.0.1-SNAPSHOT

demo1

Demo project for Spring Boot

1.8

org.springframework.boot

spring-boot-starter

org.projectlombok

lombok

true

org.springframework.boot

spring-boot-starter-test

test

com.baomidou

mybatis-plus-boot-starter

3.4.2

mysql

mysql-connector-java

6.0.5

com.alibaba

druid

1.1.10

junit

junit

org.springframework.boot

spring-boot-test

org.springframework

spring-test

org.springframework.boot

spring-boot-maven-plugin

org.projectlombok

lombok

xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">

4.0.0

org.springframework.boot

spring-boot-starter-parent

2.4.5

com.zou

demo1

0.0.1-SNAPSHOT

demo1

Demo project for Spring Boot

1.8

org.springframework.boot

spring-boot-starter

org.projectlombok

lombok

true

org.springframework.boot

spring-boot-starter-test

test

com.baomidou

mybatis-plus-boot-starter

3.4.2

mysql

mysql-connector-java

6.0.5

com.alibaba

druid

1.1.10

junit

junit

org.springframework.boot

spring-boot-test

org.springframework

spring-test

org.springframework.boot

spring-boot-maven-plugin

org.projectlombok

lombok

8、进行功能测试

注:@MapperScan(“com.zou.demo1.mapper”)指定扫描的mapper包

(1)查询测试:

package com.zou.demo1.test;

import com.zou.demo1.entity.User;

import com.zou.demo1.mapper.UserMapper;

import org.junit.Assert;

import org.junit.Test;

import org.junit.runner.RunWith;

import org.mybatis.spring.annotation.MapperScan;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.boot.test.context.SpringBootTest;

import org.springframework.test.context.junit4.SpringRunner;

import java.util.List;

/**

* @author: 邹祥发

* @date: 2021/4/21 08:57

*/

@RunWith(SpringRunner.class)

@SpringBootTest

@MapperScan("com.zou.demo1.mapper")

public class SampleTest {

@Autowired

private UserMapper userMapper;

@Test

public void selectTest() {

System.out.println(("----- selectAll method test ------"));

List userList = userMapper.selectList(null);

Assert.assertEquals(7, userList.size());

userList.forEach(System.out::println);

}

}

测试结果:

(2)插入测试:

@Test

public void insertTest(){

System.out.println(("----- insertOne method test ------"));

User user = new User();

user.setLastName("uzi");

user.setEmail("uzi@qq.com");

user.setGender(0);

user.setAge(24);

user.setVersion(1);

int i = userMapper.insert(user);

System.out.println(i);

}

测试结果:

(3)更新测试: 注:不能设置version的值(因为没有引入乐观锁的插件),否则会抛出mybatis-plus乐观锁异常

具体配置请点击:

https://mp.baomidou.com/guide/interceptor-optimistic-locker.html#optimisticlockerinnerinterceptor

@Test

public void updateTest(){

System.out.println(("----- updateOneById method test ------"));

User user = new User();

user.setId(24);

user.setLastName("mlxg");

user.setEmail("mlxg@qq.com");

user.setGender(1);

user.setAge(23);

int i = userMapper.updateById(user);

System.out.println(i);

}

测试结果:

(4)删除测试:

@Test

public void deleteTest(){

System.out.println(("----- deleteOneById method test ------"));

int i = userMapper.deleteById(24);

System.out.println(i);

}

测试结果:


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