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如何使用IntelliJ IDEA搭建MyBatis-Plus框架并连接MySQL数据库

作者:STARBLOCKSHADOW

这篇文章主要介绍了如何使用IntelliJ IDEA搭建MyBatis-Plus框架并连接MySQL数据库,本文通过实例代码给大家介绍的非常详细,对大家的学习或工作具有一定的参考借鉴价值,需要的朋友参考下吧

0 准备工作

1 创建Maven项目

2 配置Maven依赖

在pom.xml文件中添加SpringBoot和MyBatis-Plus等的依赖:

<?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>
  <!-- 定义父项目,使用Spring Boot 的版本管理 -->
  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.7.17</version>
    <relativePath/> <!-- lookup parent from repository -->
  </parent>
  <!-- 项目的基本信息 -->
  <groupId>com.z</groupId>
  <artifactId>MySSM</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>MySSM</name>
  <description>MySSM</description>
  <!-- 定义Java版本 -->
  <properties>
    <java.version>1.8</java.version>
  </properties>
  <dependencies>
    <!-- Spring Boot Web Starter,包含了Spring MVC等 -->
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <!-- MyBatis Spring Boot Starter -->
    <dependency>
      <groupId>org.mybatis.spring.boot</groupId>
      <artifactId>mybatis-spring-boot-starter</artifactId>
      <version>2.3.1</version>
    </dependency>
    <!-- MySQL Connector Java -->
    <dependency>
      <groupId>com.mysql</groupId>
      <artifactId>mysql-connector-j</artifactId>
      <scope>runtime</scope>
    </dependency>
    <!-- Lombok,简化Java代码 -->
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <optional>true</optional>
    </dependency>
    <!-- Spring Boot Starter Test -->
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-test</artifactId>
      <scope>test</scope>
    </dependency>
    <!-- MyBatis-Plus Starter -->
    <dependency>
      <groupId>com.baomidou</groupId>
      <artifactId>mybatis-plus-boot-starter</artifactId>
      <version>3.4.3</version>
    </dependency>
    <!-- Swagger Annotations -->
    <dependency>
      <groupId>io.swagger</groupId>
      <artifactId>swagger-annotations</artifactId>
      <version>1.5.22</version>
    </dependency>
  </dependencies>
  <build>
    <plugins>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
        <configuration>
          <image>
            <builder>paketobuildpacks/builder-jammy-base:latest</builder>
          </image>
          <excludes>
            <exclude>
              <groupId>org.projectlombok</groupId>
              <artifactId>lombok</artifactId>
            </exclude>
          </excludes>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>

使用Maven工具或IDEA的自动构建功能,下载依赖。

若出现如下错误:

那么点击Maven设置,选择Maven主路径为本地的Maven下载路径:

3 配置数据源

在application.yml文件中配置数据库连接等信息:

server:
  # 端口
  port: 8080
spring:
  # 数据源配置
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/your_database_name?characterEncoding=utf-8
    username: your_username
    password: your_password
  jackson:
    time-zone: GMT+8
    date-format: yyyy-MM-dd HH:mm:ss
mybatis-plus:
  # mapper文件映射路径
  mapper-locations: classpath*:mapper/*.xml
  configuration:
    # 打印SQL语句
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

替换上面的示例中的your_database_nameyour_usernameyour_password为实际数据库中的信息和数据。

4 项目结构

项目结构如下图所示:

5 创建实体类

创建实体类(entity),例如Student.java:

package com.z.entity;
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import io.swagger.annotations.ApiModelProperty;
import lombok.Data;
import java.io.Serializable;
@Data
@TableName("student")
public class Student implements Serializable {
    private static final long serialVersionUID = 1L;
    /**id*/
    @TableId(type = IdType.AUTO)
    @ApiModelProperty(value = "id")
    private Integer id;
    @ApiModelProperty(value = "姓名")
    private String name;
    @ApiModelProperty(value = "性别")
    private String sex;
    @ApiModelProperty(value = "年龄")
    private Integer age;
    @ApiModelProperty(value = "专业")
    private String major;
}

6 创建数据访问层

创建数据访问层(mapper),例如StudentMapper.java:

package com.z.mapper;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.z.entity.Student;
import org.apache.ibatis.annotations.Mapper;
@Mapper
public interface StudentMapper extends BaseMapper<Student> {
}

创建对应的XML文件:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.z.mapper.StudentMapper">
</mapper>

7 创建服务层

创建服务层(service)及其实现,例如StudentService.java:

Service层:

package com.z.service;
import com.baomidou.mybatisplus.extension.service.IService;
import com.z.entity.Student;
public interface StudentService extends IService<Student> {
}

Service实现层:

package com.z.service;
import com.baomidou.mybatisplus.extension.service.IService;
import com.z.entity.Student;
public interface StudentService extends IService<Student> {
}

8 创建Controller层

创建Controller层,处理业务逻辑,例如StudentController.java(以返回数据列表为例):

package com.z.controller;
import com.z.entity.Student;
import com.z.service.StudentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import java.util.List;
@RestController
@RequestMapping("/test")
public class StudentController {
    @Autowired
    private StudentService studentService;
    @GetMapping("/list")
    public List<Student> listStudent() {
        return studentService.list();
    }
}

9 启动项目

编写Main.java运行项目,并通过IDEA的启动按钮启动项目:

package com.z;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class Main {
    public static void main(String[] args) {
        SpringApplication.run(Main.class, args);
    }
}

10 使用Postman测试接口

在MySQL数据库中新建一个数据表student,其中存放几条测试数据:

打开Postman,新建一个Get请求,并输入对应Controller中的请求URL进行测试,测试结果如下:

前端界面可通过该接口展示数据表中的数据。

到此这篇关于使用IntelliJ IDEA搭建SSM(MyBatis-Plus)框架并连接MySQL数据库的文章就介绍到这了,更多相关idea搭建SSM框架内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家!

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