MyBatisPlus-快速入门

一、创建Maven工程

二、pom.xml文件

引入 MyBatis Plus 的依赖，

<?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>2.3.4.RELEASE</version>

        <relativePath/> <!-- lookup parent from repository -->

    </parent>

    <groupId>com.md</groupId>

    <artifactId>01-hello</artifactId>

    <version>0.0.1-SNAPSHOT</version>

    <name>01-hello</name>

    <description>Demo project for Spring Boot</description>

    <properties>

        <java.version>1.8</java.version>

    </properties>

    <dependencies>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-thymeleaf</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

<!--mysql版本-->

        <dependency>

            <groupId>mysql</groupId>

            <artifactId>mysql-connector-java</artifactId>

            <scope>5.1.9</scope>

        </dependency>

        <!--1. 加入依赖-->

        <dependency>

            <groupId>com.baomidou</groupId>

            <artifactId>mybatis-plus-boot-starter</artifactId>

            <version>3.3.1.tmp</version>

        </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>

            <exclusions>

                <exclusion>

                    <groupId>org.junit.vintage</groupId>

                    <artifactId>junit-vintage-engine</artifactId>

                </exclusion>

            </exclusions>

        </dependency>

    </dependencies>

    <build>

        <plugins>

            <plugin>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

            </plugin>

        </plugins>

    </build>

</project>

三、创建实体类

首先数据库中有对应的字段

通过lombok

package com.md.entity;

import lombok.Data;

/**

 * @author md

 * @Desc

 * @date 2020/10/26 15:38

 */

// 2. 使用这个注解直接生成set和get方法

@Data

public class Student {

    private Integer id;

    private String name;

    private Integer age;

}

四、Mapper接口

package com.md.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;

import com.md.entity.Student;

/**

 * @author md

 * @Desc

 * @date 2020/10/26 15:46

 */

// 3. 接口继承BaseMapper并指定类型

public interface StudentMapper extends BaseMapper<Student> {

}

五、主配置

spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

spring.datasource.url=jdbc:mysql://localhost:3306/springboot?serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=UTF-8

spring.datasource.username=root

spring.datasource.password=123456

# 专门用于打印日志

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

六、启动类

package com.md;

import org.mybatis.spring.annotation.MapperScan;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication

// 4. mapper扫描

@MapperScan("com.md.mapper")

public class Application {

    public static void main(String[] args) {

        SpringApplication.run(Application.class, args);

    }

}

七、测试

package com.md;

import com.md.mapper.StudentMapper;

import org.junit.jupiter.api.Test;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.boot.test.context.SpringBootTest;

@SpringBootTest

class ApplicationTests {

    @Autowired

    private StudentMapper mapper;

    // 5. 测试，查询数据

    @Test

    void contextLoads() {

        // 不加条件全部查询，把每个对象迭代出来

        mapper.selectList(null).forEach(System.out::println);

    }

}

这样就可以把对应的数据查询出来了

巴特西

MyBatisPlus-快速入门

一、创建Maven工程

二、pom.xml文件

三、创建实体类

四、Mapper接口

五、主配置

六、启动类

七、测试

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