postgresql - 无法使用 postgreSQL 自动生成序列

Question

我的实体类：

@Entity
@Table(name = "songs", schema = "dbo")
public class Song {
    @Id
    // Try 1
    @GeneratedValue(strategy = GenerationType.AUTO, generator = "songs_song_id_seq")
    // Try 2 
    @GeneratedValue(strategy = GenerationType.IDENTITY, generator = "songs_song_id_seq")
    // Try 3
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "songs_song_id_seq")
    // Just so you know, when using one try, the other 2 were commented out :D

    @Column(name = "song_id")
    private Integer songId;

    // MRE
}

我的数据库：（PostgreSQL 10）
我的序列生成器

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我的邮递员 POST 请求：

{
    "songName": "Song1",
    "songDuration": "500"
}

---

表：
我的表

序列 DDL：（nextval('dbo.songs_song_id_seq'::regclass)这与数据类型 BigSerial 一起提供）

我不断收到的错误：The given id must not be null!; nested exception is java.lang.IllegalArgumentException: The given id must not be null!

---

我没有选择。请告诉我我做错了什么。

PS：使用 Spring Boot 和 PostgreSQL 的第一天。

Answer 1

Maybe you have a little incorrect code anywhere. For viewing return values of nextval function, so execute this query

select * from nextval('public.table_id_seq'::regclass)

3-5 times, you will view returned values. Values are modified in the same execution time.

If you want to use this function on inserting process manually, then use this sample query:

INSERT INTO table1 (id, "date", amount) VALUES(nextval('public.table_id_seq'::regclass), '2021-02-06', 30);

I tested all theses queries, worked 100%