springboot集成jpa,在postgresql数据库中创建主键自增表

依赖文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>com.example</groupId>
	<artifactId>demo</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>demo</name>
	<description>Demo project for Spring Boot</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.1.0.RELEASE</version>
		<relativePath/>
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-jpa</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<dependency>
			<groupId>org.postgresql</groupId>
			<artifactId>postgresql</artifactId>
		</dependency>

	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

</project>

　　

配置文件

 spring:
   datasource:
     url: jdbc:postgresql://127.0.0.1:5432/postgres
     username: postgres
     password: postgres
     driverClassName: org.postgresql.Driver
     initialization-mode: always
   jpa:
     show-sql: true
     hibernate:
       ddl-auto: update
     properties:
       hibernate:
         temp:
           use_jdbc_metadata_defaults: false

实体类

package com.example.demo;

import javax.persistence.*;
import java.io.Serializable;

/**
 * @Author:
 * @Description:
 * @Date Create in 2018/11/29 18:12
 * @Modified By:
 */
@Entity
@Table(name="test_pg_wushan")
public class TestDomain implements Serializable {

    private static final long serialVersionUID = 2672553622864930471L;
    @Id
    @GeneratedValue(strategy= GenerationType.SEQUENCE,generator="s_test_pg_wushan")
    @SequenceGenerator(sequenceName="test_sequence", name="s_test_pg_wushan",allocationSize = 1)
    @Column(name="test_id")
    private Integer id;
    @Column(name="test_name")
    private String name;

    public Integer getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

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

repository类

 package com.example.demo;

 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.stereotype.Service;

 /**
  * @Author:
  * @Description:
  * @Date Create in 2018/11/29 18:14
  * @Modified By:
  */
 @Service
 public interface TestRepository extends JpaRepository<TestDomain, Long> {
 }

controller类

package com.example.demo;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

/**
 * @Author:
 * @Description:
 * @Date Create in 2018/11/29 18:13
 * @Modified By:
 */
@Controller
public class TestController {

    @Autowired
    TestRepository testRepository ;

    @RequestMapping("/")
    @ResponseBody
    public String test1(){
        return "hello";
    }

    @RequestMapping("/save")
    @ResponseBody
    public String test2(){
        TestDomain te = new TestDomain();
        te.setName(System.currentTimeMillis()+"");
        testRepository.save(te);
        testRepository.flush();
        return "success";
    }
}

备注：

创建表后，查看创建sql语句，发现主键并没有设置为序列自增。但是使用controller类操作存储元素，是可以在不指定主键值的情况下存储的。