SpirngBoot整合Spring-data-JPA
2024-09-05 20:50:39
0.引言
使用SpringBoot data jpa技术相比mybatis是比较难的，这里只给出整合方法
1.引入SpringBoot data jpa
<!--JPA依赖-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<!--连接池-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.9</version>
</dependency>
<!--mysql依赖-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
2.配置文件
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/mathproject?serverTimezone=UTC&useSSL=true&allowMultiQueries=true&characterEncoding=utf8
spring.datasource.username=root
spring.datasource.password=123456
spring.jpa.show-sql=true
spring.jpa.database=mysql
spring.jpa.hibernate.ddl-auto=update
spring.jpa.database-platform=org.hibernate.dialect.MySQL57InnoDBDialect
server.servlet.session.timeout=600m
3.建表
ORM框架不需要建表，只需要在Bean中加个@Entity注解就行
import javax.persistence.*;
/**
* 广告表
*/
@Entity(name="Advertisement")
public class Advertisement {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "id",columnDefinition="bigint COMMENT '主键，自动生成'")
private Integer id;
@Column(name = "img",columnDefinition="varchar(32)")
private String img;
@Column(name = "href",columnDefinition="varchar(32)")
private String href;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getImg() {
return img;
}
public void setImg(String img) {
this.img = img;
}
public String getHref() {
return href;
}
public void setHref(String href) {
this.href = href;
}
}
4.DAO层
持久层的话直接继承下来就行,别的都不用做
import org.just.computer.mathproject.Entity.Advertisement;
import org.springframework.data.jpa.repository.JpaRepository;
public interface AdvertisementResp extends JpaRepository<Advertisement,Integer> {
}
5.service层
新手千万记得要加@Service，否则会在IOC时无法注入
import org.just.computer.mathproject.DAO.AdvertisementResp;
import org.just.computer.mathproject.Entity.Advertisement;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class AdvertisementService {
@Autowired
AdvertisementResp advertisementResp;
public List<Advertisement> getAllAdvertisement(){
return advertisementResp.findAll();
}
public void addAdvertisement(String img,String href){
Advertisement advertisement=new Advertisement();
advertisement.setImg(img);
advertisement.setHref(href);
advertisementResp.save(advertisement);
}
public void deleteAdvertisementById(Integer id){
advertisementResp.deleteById(id);
}
}
6.Controller层
注意这里结合了swagger的注解
@RestController
@Api(tags ="广告")
@RequestMapping("/Advertisement/")
public class AdvertisementController {
@Autowired
AdvertisementService advertisementService;
@ApiOperation(value ="获得所有广告")
@GetMapping("/getAllAdvertisement")
public List<Advertisement> getAllAdvertisement(){
return advertisementService.getAllAdvertisement();
}
@ApiOperation(value = "添加广告")
@GetMapping("/addAdvertisement")
public Boolean getAllAdvertisement(@RequestParam String img, @RequestParam String href){
try {
advertisementService.addAdvertisement(img,href);
return true;
}catch (Exception e){
return false;
}
}
@ApiOperation(value = "删除广告")
@GetMapping("/deleteAdvertisement")
public Boolean deleteAdvertisementById(Integer id){
try{
advertisementService.deleteAdvertisementById(id);
return true;
}catch (Exception e){
return false;
}
}
}
7.运行后结果如下
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