1、插入语句

@Transactional
@Query(value = "insert into number_rule values(?1,?2)", nativeQuery = true)
@Modifying
int insertRule(int nums,int rule);

2、更新语句

@Transactional
@Query(value = "update number_count set count = ?1", nativeQuery = true)
@Modifying
public void updateCount(int count);

3、查询语句

@Transactional
@Query(value = "select count from number_count")
@Modifying
Count selectCount();

4

4、删除语句

@Transactional
@Modifying
@Query(value = "delete from number_count  where count =?1",nativeQuery = true)
int deleteCount(int count);

注意：
不加@Transactional有可能会抛javax.persistence.TransactionRequiredException:异常，我是在抛异常之后才加上的。

@Transactional、 @Query、@Modifying这三个注解都是需要的

nativeQuery = true代表使用原生sql

下面贴一下完整代码：

package com.example.demo.mapper;

import com.example.demo.entity.Count;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Modifying;
import org.springframework.data.jpa.repository.Query;
import org.springframework.stereotype.Component;
import org.springframework.transaction.annotation.Transactional;

/**
 * 计数器 数据库映射
 *
 * @author zhaohualuo
 * @date 2019/8/30
 **/
@Component
public interface CountMapper extends JpaRepository {
    /*
     * 我们在这里直接继承 JpaRepository
     * 这里面已经有很多现场的方法了
     * 这也是JPA的一大优点
     *
     * */
    @Transactional
    @Query(value = "update number_count set count = ?1", nativeQuery = true)
    @Modifying
    public void updateCount(int count);
}

28

package com.example.demo.controller;

import com.example.demo.entity.Count;
import com.example.demo.mapper.CountMapper;
import com.example.demo.service.DisorderService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.Calendar;
import java.util.List;
import java.util.Random;

/**
 * 生成不重复数字
 *
 * @author zhaohualuo
 * @date 2019/8/30
 **/
@RestController
public class DisorderController {

    @Autowired CountMapper countMapper;

    @GetMapping("/list")
    public int findAll() {
        return countMapper.updateCount(1);
    }
}

9

package com.example.demo.entity;

import lombok.Data;

import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;

/**
 * 累加器实体类
 *
 * @author zhaohualuo
 * @date 2019/8/30
 **/
@Data
@Entity
@Table(name = "number_count")
public class Count {

    @Id
    private int count;
}

2

application.yml

spring:
  devtools:
    restart:
      enabled: false
  datasource:
    driver-class-name: org.postgresql.Driver
    url: jdbc:postgresql://localhost:5432/xxx
    username: xxx
    password: xxx
  jpa:
    hibernate:
      ddl-auto: update
    show-sql: true
    database-platform: org.hibernate.dialect.PostgreSQLDialect
    properties:
      hibernate:
        temp:
          use_jdbc_metadata_defaults: false

package com.example.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class DemoApplication {

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

}

3

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
4.0.0
org.springframework.bootspring-boot-starter-parent2.1.7.RELEASE
com.example
demo
0.0.1-SNAPSHOT
demo
Demo project for Spring Boot

1.8

org.springframework.bootspring-boot-starter-data-jpaorg.springframework.bootspring-boot-starter-weborg.springframework.bootspring-boot-devtoolsruntimetrueorg.postgresqlpostgresqlruntimeorg.projectlomboklomboktrueorg.springframework.bootspring-boot-starter-testtest

org.springframework.bootspring-boot-maven-plugin

启动项目之后，访问地址：

http://localhost:8080/list