Mybatis-plusAR mode

Baidu Encyclopedia

Active Record is a domain model pattern characterized by an entity class corresponding to a table in a relational database, and an entity class instance corresponding to the data in the table. ActiveRecord strictly follows the standard ORM model: tables map to entity objects, and columns map to entity object properties.

create project

 

 引入SpringBoot devtoos, lombok,spring web,spring data jdbc ,mysql driver,mybatis Framework

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 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>2.7.2</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>mybatis-plusar</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>mybatis-plusar</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
<!--        <dependency>-->
<!--            <groupId>org.mybatis.spring.boot</groupId>-->
<!--            <artifactId>mybatis-spring-boot-starter</artifactId>-->
<!--            <version>3.0.0</version>-->
<!--        </dependency>-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.4.2</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </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>
    </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>

 application.properties

#热部署生效
spring.devtools.restart.enabled=true
#设置重启目录
spring.devtools.restart.additional-paths=src/main/java
#排除目录
spring.devtools.restart.exclude=static/**

spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/mydb?serverTimezone=GMT%2B8&useUnicode=true&characterEncoding=utf8&autoReconnect=true&allowMultiQueries=true
spring.datasource.username=root
spring.datasource.password=123456



#Mybatis-plus配置
#指定实体包名
mybatis-plus.type-aliases-package=com.example.mybatisplusar.mapper
#指定.xml路径
mybatis-plus.mapper-locations=classpath:/mapper/*.xml
#开启驼峰命名
mybatis-plus.configuration.map-underscore-to-camel-case=true

mybatis-plus.configuration.log-impl=org.apache.ibatis.logging.stdout.StdOutImpl



#mybatis配置
#mybatis.mapper-locations=classpath:/mapper/*.xml
##配置模型路径
#mybatis.type-aliases-package=com.example.mybatisplus.pojo
##开启驼峰命名
#mybatis.configuration.map-underscore-to-camel-case=true


#Spring 框架自带的日志框架（Spring Framework Logging）
#logging.level.com.example.mybatisplus=debug


#http://localhost:8080/actuator/health
management.endpoint.health.show-details=always

general structure

 

Active Record Regulations

A table corresponds to an entity class, and each object instance of the class corresponds to a row of records in the table;

ActiveRecord itself is an entity class, and at the same time implements a persistent API, which can implement CRUD logic by itself

Implementation steps:

1. The entity class inherits Model<T> and specifies the generic type

2. The interface implements BaseMapper<T>, and specifies the generic type

specific demonstration

 Added the default snowflake algorithm

 

Revise

 

 

 Inquire