springboot jpa-优快云博客

本文详细介绍如何在Spring Boot项目中使用JPA进行数据库操作，包括创建实体类、定义Repository接口及实现CRUD操作，并提供了具体的HTTP访问示例。

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1.创建demo表添加数据，便于测试

CREATE TABLE `demo` (
`id` INT(11) NOT NULL AUTO_INCREMENT,
`name` VARCHAR(100) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=INNODB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8

INSERT INTO demo(NAME) VALUES('tom');
INSERT INTO demo(NAME) VALUES('link');
INSERT INTO demo(NAME) VALUES('jink');
COMMIT;

2.创建Demo实体类

package springboot.data.jpa.entity;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
@Entity
public class Demo {

  @Id
  private int id;
  @Column 
  private String name;
 
  public int getId() {
    return id;
  }

  public void setId(int id) {
    this.id = id;
  }

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }
}

3.UserRepository接口

package springboot.data.jpa.repository;
import javax.transaction.Transactional;
import org.springframework.data.jpa.repository.Modifying;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.CrudRepository;
import org.springframework.data.repository.query.Param;
import springboot.data.jpa.entity.Demo;

 public interface UserRepository extends CrudRepository<Demo, Long> {
    
	//select
	@Query("select u from Demo u where u.id= :id")//使用Query查询  
    Demo findById(@Param("id") int id);  
	//update
	@Transactional
	@Modifying
	@Query("update Demo set name=?1 where id=?2")//使用Query查询  
    int updateById(@Param("name") String name,@Param("id") int id);  
	//delete
	@Transactional
	@Modifying
	@Query("delete from Demo where id=?1")//使用Query查询  
    int deleteById(@Param("id") int id);  
	 
}

4.UserControl类

package springboot.data.jpa.control;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;  
import org.springframework.web.bind.annotation.RequestMethod;  
import org.springframework.web.bind.annotation.RestController;  
import springboot.data.jpa.entity.Demo;
import springboot.data.jpa.repository.UserRepository;
  
@RestController  
@RequestMapping(value = "/user")  
public class UserControl {  
  
    @Autowired
	UserRepository userRepository;  
   
        
    @RequestMapping(value = "/seleteUser" , method = RequestMethod.GET)  
    public Demo seleteUser(int id){
      	Demo user=userRepository.findById(id);
     	return user;
    }
    
    @RequestMapping(value = "/updateUser" , method = RequestMethod.GET)  
    public int seleteUser(int id,String name){
      	int rs=userRepository.updateById(name, id);
         return rs;  
    }
    
    @RequestMapping(value = "/deleteUser" , method = RequestMethod.GET)  
    public int deleteUser(int id){
      	int rs=userRepository.deleteById(id);
         return rs;  
    }     
     
}

5.springboot启动类

package springboot;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
 @SpringBootApplication
public class SpringbootApplication {
  
 public static void main(String[] args) {
     SpringApplication app=new SpringApplication(SpringbootApplication.class);
	 app.run(args);
  
 }
}

6.访问方式：

查询：http://localhost:8080/user/selectUser?id=1

修改：http://localhost:8080/user/updateUser?id=1&name=aa

删除：http://localhost:8080/user/deleteUser?id=1