Springboot-mybatisplus-mp整合案例_mp整合mysql-优快云博客

本文链接：https://blog.youkuaiyun.com/weixin_45230720/article/details/124830897

该博客介绍了如何创建一个SpringBoot项目，并集成Mybatis-Plus和MySQL数据库。首先，展示了配置pom.xml文件，引入了相关依赖，包括SpringBoot、Mybatis-Plus、MySQL驱动和Lombok。接着，配置了application.properties文件，设定数据库连接信息。然后，创建了User实体类、UserMapper接口以及MyApplication启动类。最后，编写了一个测试类用于验证数据查询功能。通过这个例子，读者可以了解到SpringBoot应用中如何进行数据库操作。

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创建模块之后

导入坐标完成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>2.1.4.RELEASE</version>
    </parent>

    <groupId>org.example</groupId>
    <artifactId>SpringBoot-Mybatis-MP</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
            <version>2.6.7</version>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-logger</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <version>2.6.7</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.24</version>
        </dependency>


        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.5.1</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.29</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.7.36</version>
        </dependency>

    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>2.5.5</version>
            </plugin>
        </plugins>
    </build>

</project>

创建application.properties文件

spring.application.name = SpringBoot-Mybatis-MP
spring.datasource.driver-class-name = com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/mp?useUnicode=true&characterEncoding=utf8&autoReconnect=true&allowMultiQueries=true&useSSL=false
spring.datasource.username=root
spring.datasource.password=****

创建实体类user

package 自己创建包的路径.pojo;

import com.baomidou.mybatisplus.annotation.TableName;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@NoArgsConstructor
@AllArgsConstructor
@TableName("tb_user")
public class User {
    private  long id ;
    private  String userName;
    private  String password;
    private  String name;
    private  Integer age;
    private  String email;
}

创建mapper类

package 自己创建包的路径.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import 自己包的.pojo.User;

public interface UserMapper extends BaseMapper<User> {
}

要再二级包的下面创建application

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.SpringBootConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@MapperScan("com.itheima.mapper")//设置mapper接口的扫描包
@SpringBootApplication
public class MyApplication {

    public static void main(String[] args) {
        SpringApplication.run(MyApplication.class,args);

    }
}

写测试类


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 = userMapper.selectList(null);
        for(User user :users){
            System.out.println(user);
        }
    }
}

运行测试显示数据库表里面的类容。