SpringBoot:Mybatis整合PostgreSQL

Posted 2023-05-17

参考技术A 在resources下创建pgmapper文件夹,放置sql文件

整合SpringBoot+MyBatis

1、新建一个SpringBoot项目

 2、添加基本依赖

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.2</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>

3、完善默认端口设置、mybatis配置、数据源配置

server:
  port: 8066

# mybatis配置
mybatis:
  #mapper文件路径（**表示匹配多个）
  mapperLocations: classpath:com/ssd/gem/**/mappers/*.xml
  #typeAlias包路径
  type-alias-package:

spring:
  # 数据源
  datasource:
    url: jdbc:mysql://localhost:3306/gem?serverTimezone=UTC&useSSL=false
    username: root
    password: 123456
    driver-class-name: com.mysql.cj.jdbc.Driver

4、使用mybatis generator生成pojo、mapper接口、mapper.xml。可参考https://www.cnblogs.com/shisandao/p/12524249.html

5、service接口

package com.ssd.gem.service;

import com.ssd.gem.mbg.model.GemOrder;

public interface IGemOrderService {

    void insert(GemOrder gemOrder);

}

6、service实现

package com.ssd.gem.service.impl;

import com.ssd.gem.mbg.mapper.GemOrderMapper;
import com.ssd.gem.mbg.model.GemOrder;
import com.ssd.gem.service.IGemOrderService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class GemOrderServiceImpl implements IGemOrderService {

    @Autowired
    private GemOrderMapper gemOrderMapper;

    @Override
    public void insert(GemOrder gemOrder) {
        gemOrderMapper.insert(gemOrder);
        return;
    }
}

7、controller控制器

package com.ssd.gem.controller;

import com.ssd.gem.mbg.model.GemOrder;
import com.ssd.gem.service.IGemOrderService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class GemOrderController {

    @Autowired
    private IGemOrderService iGemOrderService;

    @RequestMapping("/order/insert")
    void insert(@RequestBody GemOrder gemOrder) {
        iGemOrderService.insert(gemOrder);
    }

}

8、设置bean的扫描路径：@SpringBootApplication(scanBasePackages={"com.ssd.gem.*"})

package com.ssd.gem;

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

@SpringBootApplication(scanBasePackages={"com.ssd.gem.*"})
@MapperScan("com.ssd.gem.**.mapper")
public class GemApplication {

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

}

SpringBootApplication启动时会默认扫描主类当前包及子包的所有类，寻找标注了@Component,@Service,@Controller,@Repository注解的类，并把这些类纳入进spring容器中管理。设置扫描路径可以缩小扫描范围。

9、设置mapper接口的扫描路径：@MapperScan("com.ssd.gem.**.mapper")

　　作用：指定要变成实现类的接口所在的包，然后包下面的所有接口在编译之后都会生成相应的实现类。

　　注解多个包：@MapperScan("A","B")。

　　该注释可以使用注释 @Mapper 代替，需要在每个mapper接口类上加该注解，比较繁琐。

10、测试：http://localhost:8066/order/insert（注意参数格式）