SpringBoot_持久化方案_MybatisPlus

冷不防 2021-10-06 04:00 381阅读 0赞

### SpringBoot\_持久化方案\_MybatisPlus ###

*  依赖pom.xml
 *  配置文件application.properties
 *  源码

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>
           
    		<dependency>
    			<groupId>org.projectlombok</groupId>
    			<artifactId>lombok</artifactId>
    			<optional>true</optional>
    		</dependency>
           
    		<dependency>
    			<groupId>com.baomidou</groupId>
    			<artifactId>mybatis-plus-boot-starter</artifactId>
    			<version>3.0.5</version>
    		</dependency>
           
    		<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> {
     
    }