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','[email protected]','1',22,1),(2,'Jerry','[email protected]','0',25,1),(3,'Black','[email protected]','1',30,1),(4,'White','[email protected]','0',35,1),(14,'小邹','[email protected]','0',19,1),(18,'jack','[email protected]','1',22,1),(22,'abc','[email protected]','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
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：
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("[email protected]");
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("[email protected]");
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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