Mybatis-plus插件的学习与使用
本文是基于Windows 10系统环境,利用mybatis-plus实现数据库表的CRUD
- Windows 10
- IntelliJ
一、构建过程(简单入门)
(1) 打开IntelliJ,创建一个新项目
(2) 选择“maven”工程,然后点击“next”
(3) 填写公司ID等信息,然后点击“next”
(4) 填写项目名称等信息,然后点击“finish”
(5) 点击“pom.xml”文件,然后填写各种依赖的坐标
<?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">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.4.RELEASE</version>
</parent>
<groupId>com.inspur.intellid</groupId>
<artifactId>mybatis-plus-demo</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!-- mybatis-plus的spring-boot支持 -->
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.1.1</version>
</dependency>
<!-- mysql的驱动支持 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.47</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
(6) 创建一个User类,然后生成相应的属性和方法
package com.inspur.intellid.mybatisplus.pojo;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@NoArgsConstructor
@AllArgsConstructor
@TableName("user")
public class User {
private String id;
private String username;
private String nickname;
private String type;
private String password;
}
(7) 创建一个UserMapper类
package com.inspur.intellid.mybatisplus.mapper;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.inspur.intellid.mybatisplus.pojo.User;
import org.apache.ibatis.annotations.Mapper;
@Mapper
public interface UserMapper extends BaseMapper<User> {
}
(8) 创建一个MybatisPlusApplication启动类
package com.inspur.intellid.mybatisplus;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@MapperScan("com.inspur.intellid.mybatisplus.mapper")
@SpringBootApplication
public class MybatisPlusApplication {
public static void main(String[] args) {
SpringApplication.run(MybatisPlusApplication.class, args);
}
}
(9) 创建一个主配置文件Application.properties
spring.application.name=mybatis-plus-demo
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/zs200
spring.datasource.username=root
spring.datasource.password=123456
(10) 创建一个UserMapper类
package com.inspur.intellid.mybatisplus.mapper;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.inspur.intellid.mybatisplus.pojo.User;
import org.apache.ibatis.annotations.Mapper;
@Mapper
public interface UserMapper extends BaseMapper<User> {
}
(11) 写一个测试类,测试CRUD结果
package com.inspur.intellid.mybatisplus.mapper;
import com.inspur.intellid.mybatisplus.pojo.User;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import java.util.List;
@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest
public class UserMapperTest {
@Autowired
private UserMapper userMapper;
@Test
public void testSelect(){
List<User> users = this.userMapper.selectList(null);
for(User user : users){
System.out.println(user);
}
}
}
结果如图