先贴下自己的简单代码

import javax.persistence.*;
import java.util.Date;
import java.util.UUID;

@Entity
@Table(name = "vehicle")
public class Vehicle {
    /** serialVersionUID. */
    private static final long serialVersionUID = 1L;

    /** 主键. */
    @Id
    @GeneratedValue
    private UUID t_id;

    private Date created_at = new Date();

    private Date modified_at  = new Date();

    @Column(unique = true)
    private String id;

    public UUID getT_id() {
        return t_id;
    }

    public void setT_id(UUID t_id) {
        this.t_id = t_id;
    }

    public Date getCreated_at() {
        return created_at;
    }

    public void setCreated_at(Date created_at) {
        this.created_at = created_at;
    }

    public Date getModified_at() {
        return modified_at;
    }

    public void setModified_at(Date modified_at) {
        this.modified_at = modified_at;
    }

    public String getId() {
        return id;
    }

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

    public Vehicle() {
    }

    public Vehicle(UUID t_id, Date created_at, Date modified_at, String id) {
        this.t_id = t_id;
        this.created_at = created_at;
        this.modified_at = modified_at;
        this.id = id;
    }
}

 

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

public interface VehicleRepos extends JpaRepository<Vehicle, String> {
}

 

public void addData() {
   Date now = new Date();
   Vehicle vehicle = new Vehicle(UUID.randomUUID(), now, now, "vehicleid02");
   vehicleRepos.save(vehicle);
}

 

spring:  
  datasource:
    url: jdbc:postgresql://<ip>:<port>/<db name>
    username: postgres
    password: postgres
    jpa:
      show-sql: true
      hibernate:
        ddl-auto: update
      properties:
        hibernate:
          dialect: org.hibernate.dialect.PostgreSQLDialect
          temp:
            use_jdbc_metadata_defaults: false

　　

　　

　　

也记录下sping小白第一次用spring data jpa遇到的问题

1 user表的问题

小知识点：在postgresql中，默认有一张user表用来存放postgresql的用户，所以当我们自己建立一个user表的时候，优先访问系统默认的user表。当我们想访问自己创建的user表的时候，需要加public前缀（public.user).

所以第一次建表时刚好踩到这个坑，执行后进postgres看，user表根据代码中model自动创建了，save方法也执行成功了，但是select的时候又没有数据

 

2 空的构造函数

报错： org.springframework.orm.jpa.JpaSystemException: No default constructor for entity

需要给数据库表model增加一个空的构造函数