SpringBoot整合Mybatis

最新推荐文章于 2025-12-02 13:55:12 发布

原创最新推荐文章于 2025-12-02 13:55:12 发布 · 109 阅读

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本文档详细介绍了如何创建一个Spring Boot项目，并集成Mybatis-Plus进行数据库操作。首先，通过添加相关依赖到pom.xml文件来初始化项目。接着，创建主启动类、POJO对象、Mapper接口和测试类。在测试类中，展示了如何使用Mybatis-Plus进行数据查询和插入。此外，还配置了Mapper文件和YML文件，包括数据库连接信息及Mybatis-Plus的配置。

一，创建项目

二，添加jar包（pom.xml文件）

<?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>2.5.3</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.jt</groupId>
    <artifactId>springboot_demo_3</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springboot_demo_3</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-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>

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

       <!--引入数据库驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>

        <!--springBoot数据库连接  -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>



        <!--spring整合mybatis-plus MP中包含了mybatis的包所以将原来的包删除 -->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.4.3</version>
        </dependency>
    </dependencies>

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


</project>

三，编辑主启动类

四，编辑POJO对象

五，编辑Mapper接口

六，编辑测试类

package com.jt.test;

import com.jt.mapper.ReportMapper;
import com.jt.pojo.Report;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.List;

@SpringBootTest //该注解只能使用在测试包
public class TestMybatis2 {

    @Autowired
    private ReportMapper reportMapper;

    @Test
    public void testFind(){
        System.out.println(reportMapper.getClass());
        List<Report> reportList = reportMapper.findAll();
        System.out.println(reportList);
    }

    @Test
    public void insert(){
        Report report = new Report();
        report.setName("键盘").setCount(99);
        reportMapper.insert(report);
        System.out.println("增加数据成功");
    }

    //利用mp机制入库
    @Test
    public void testInsert(){
        Report report = new Report();
        report.setName("鼠标").setCount(101);
        reportMapper.insert(report);
    }
}

七，编辑Mapper配置文件

八，编辑YML配置文件

server:
  port: 8090
  servlet:
    context-path: /
spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://127.0.0.1:3306/jt?serverTimezone=GMT%2B8&useUnicode=true&characterEncoding=utf8&autoReconnect=true&allowMultiQueries=true
    username: root
    password: 12345678

mybatis-plus:
  type-aliases-package: com.jt.pojo
  mapper-locations: classpath:/mappers/*.xml
  #开启驼峰映射
  configuration:
    map-underscore-to-camel-case: true