使用springboot整合mybatis-plus实现数据库的增删查改示例

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Lombok插件，简化开发

3、在pom.xml中加入mybatis-plus及mysql数据库的依赖

<!--mybatis-plus相关依赖--><dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>3.4.2</version></dependency><dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>6.0.5</version></dependency><dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.1.10</version></dependency>

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<User> {}

7、因测试需要加入一些依赖，完整的pom.xml如下：

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd'> <modelVersion>4.0.0</modelVersion> <parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.4.5</version><relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.zou</groupId> <artifactId>demo1</artifactId> <version>0.0.1-SNAPSHOT</version> <name>demo1</name> <description>Demo project for Spring Boot</description> <properties><java.version>1.8</java.version> </properties> <dependencies><dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter</artifactId></dependency><dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional></dependency><dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope></dependency><!--mybatis-plus相关依赖--><dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>3.4.2</version></dependency><dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>6.0.5</version></dependency><dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.1.10</version></dependency><dependency> <groupId>junit</groupId> <artifactId>junit</artifactId></dependency><dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-test</artifactId></dependency><dependency> <groupId>org.springframework</groupId> <artifactId>spring-test</artifactId></dependency> </dependencies> <build><plugins> <plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><configuration> <excludes><exclude> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId></exclude> </excludes></configuration> </plugin></plugins> </build></project>

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<User> userList = userMapper.selectList(null);Assert.assertEquals(7, userList.size());userList.forEach(System.out::println); }}

测试结果：

（2）插入测试：

@Testpublic 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

<!--乐观锁插件--> <bean />

具体配置请点击：https://mp.baomidou.com/guide/interceptor-optimistic-locker.html#optimisticlockerinnerinterceptor

@Testpublic 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：

@Testpublic 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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