IDEA新建SpringBoot+MySQL+MyBatis+Lombok+Spring Boot DevTools项目

一，IDEA新建SpringBoot+MySQL+MyBatis+Lombok+Spring Boot DevTools项目

1，新建项目的选中项

2，新建后我们需要配置勾选这个自动编译

3，按住shift+alt+ctrl+/，然后选中registry

4，然后选中这个选项

5,然后在 pom.xml文件添加以下代码，开启热部署工具，不配置不生效

  <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <!--必须配置devtools-->
                    <fork>true</fork>
                </configuration>
            </plugin>
        </plugins>
    </build>

6,启用lombok,一个实体类简化插件，简化了实体的set get,浏览安装插件

PS：如果你的IDEA连不上网，下载不了，你就去下载插件导入，不过必须下载对应IDEA的版本的插件，如下导入方法，选择你下载好的路径

离线下载地址如下：https://github.com/mplushnikov/lombok-intellij-plugin/releases

二，环境创建和准备好了，开始撸代码

1，新建好的项目结构

2，如下代码

BaseMapper

package com.boot.nlssm.bootnlssm.common;

import tk.mybatis.mapper.common.Mapper;
import tk.mybatis.mapper.common.MySqlMapper;

/**
 * 项目中所有Mapper类的父类
 * @param <T>
 */
public interface BaseMapper<T> extends Mapper<T>, MySqlMapper<T> {
}

UserInfo

package com.boot.nlssm.bootnlssm.domain;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import javax.persistence.Id;
import javax.persistence.Table;
import java.util.Date;

@Data
@AllArgsConstructor
@NoArgsConstructor
@Table(name = "t_user")
public class UserInfo {
    @Id // 设定为主键
    private Integer userId;
    private String userName;
    private Date createDate;
}

UserInfoMapper

package com.boot.nlssm.bootnlssm.mapper;

import com.boot.nlssm.bootnlssm.domain.UserInfo;
import tk.mybatis.mapper.common.BaseMapper;

public interface UserInfoMapper extends BaseMapper<UserInfo> {

}

BootNlssmApplication

package com.boot.nlssm.bootnlssm;

import com.boot.nlssm.bootnlssm.domain.UserInfo;
import com.boot.nlssm.bootnlssm.mapper.UserInfoMapper;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;
import tk.mybatis.spring.annotation.MapperScan;

@SpringBootApplication
@MapperScan("com.boot.nlssm.bootnlssm.mapper")
public class BootNlssmApplication {

    public static void main(String[] args) {

        ConfigurableApplicationContext context= SpringApplication.run(BootNlssmApplication.class, args);

        UserInfoMapper mapper = context.getBean(UserInfoMapper.class);
        UserInfo book1 = mapper.selectByPrimaryKey(1);
        UserInfo book2 = mapper.selectByPrimaryKey(2);
        System.out.print(book1.toString());
        context.close();
    }

}

application.yml

spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/test?serverTimezone=UTC&useSSL=false
    username: root
    password: root
mapper:
  identity: MYSQL
  not-empty: true
  mappers:
    - tk.mybatis.mapper.common.Mapper
    - tk.mybatis.mapper.common.MySqlMapper
logging:
  level:
    com.example.bootssm2.mapper:  debug

三，这时你就可以运行main函数执行数据操作，当然你需要在本地安装数据库MySql

表结构代码

CREATE TABLE `t_user` (
  `user_Id` int(11) NOT NULL,
  `user_Name` varchar(255) DEFAULT NULL,
  `create_Date` datetime DEFAULT NULL,
  PRIMARY KEY (`user_Id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

为什么实体不用拆分呢，因为框架内自动默认映射驼峰拆分就是user_Id对应于userId

来源：https://www.cnblogs.com/May-day/p/12070993.html

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