SpringBoot_持久化方案_MybatisPlus

在后台系统服务的开发过程中，必然要和数据库进行交互，在本套课程中，ORM这一层的技术选型，我们采用 Mybatis框架作为持久层框架，原因是Mybatis对SQL语句编写更加的灵活。
为了提升开发的效率，所以选用MybatisPlus作为mybatis的插件，以提升开发的效率。

依赖pom.xml

<?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>2.1.0.RELEASE</version>
	</parent>
	<groupId>com.plxc.mybatisplus</groupId>
	<artifactId>mybatis-plus</artifactId>
	<version>1.0-SNAPSHOT</version>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
       <!--简化代码的工具包 -->
		<dependency>
			<groupId>org.projectlombok</groupId>
			<artifactId>lombok</artifactId>
			<optional>true</optional>
		</dependency>
       <!--mybatis-plus的springboot支持 -->
		<dependency>
			<groupId>com.baomidou</groupId>
			<artifactId>mybatis-plus-boot-starter</artifactId>
			<version>3.0.5</version>
		</dependency>
       <!--mysql驱动 -->
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>5.1.47</version>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>
</project>

配置文件application.properties

spring.application.name =mybatis-plus
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/mybatisplus?useUnicode=true&characterEncoding=utf8&autoReconnect=true&allowMultiQueries=true&useSSL=false
spring.datasource.username=root
spring.datasource.password=root

# MybatsiPlus自定义配置
# 指定全局配置文件 
mybatis-plus.config-location = classpath:mybatis-config.xml 
# 指定mapper.xml文件 
mybatis-plus.mapper-locations = classpath*:mybatis/*.xm

源码

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.WebApplicationType;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor; 
//应用入口配置
@MapperScan("com.plxc.mybatisplus.mapper") //设置mapper接口的扫描包
@SpringBootApplication 
public class Application {
 	//分页插件 
	@Bean
	public PaginationInterceptor paginationInterceptor() {
		return new PaginationInterceptor();
	}   
   public static void main(String[] args) {      
 		SpringApplication.run(Application.class, args);
  }
}

//实体类
public class User {
	@TableId(value = "ID", type = IdType.AUTO)  //主键自增配置
	private Long id;
	private String name;
	private Integer age;
	private String email;
	public Long getId() { return id;   }
	public void setId(Long id) { this.id = id;   }
	public String getName() { return name;   }
	public void setName(String name) { this.name = name;   }
	public Integer getAge() { return age;   }
	public void setAge(Integer age) { this.age = age;   }
	public String getEmail() { return email;   }
	public void setEmail(String email) { this.email = email;   }
	@Override  
	public String toString() { 
		return "User{" +  "id=" + id +  ", name='" + name + '\'' +  ", age=" + age +  ", email='" + email + '\'' +  '}';   
	}
}

import com.plxc.mybatisplus.pojo.User; 
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
 //mybatisplus提供基本的单表操作方法，通过注入即可调用@Autowired  private UserMapper userMapper;
public interface UserMapper extends BaseMapper<User> {
 
}