database - PostgreSQL table id won't auto-increment

Question

I have a table in my database that is in dire need of an auto-incrementing field. To create one, I ran these following SQL statements towards the aforementioned database:

CREATE SEQUENCE table_id_seq
    INCREMENT 1
    NO MINVALUE
    NO MAXVALUE
    START 1
    CACHE 1;

ALTER TABLE ONLY table ALTER COLUMN id SET DEFAULT nextval('table_id_seq'::regclass);
ALTER TABLE ONLY table
    ADD CONSTRAINT table_id PRIMARY KEY (id);

However, when I try to INSERT any two values into table I still get a primary key violation error. I don't understand what I'm missing to make it auto-incrementing.

Answer 1

使用实体框架并对数据库进行更改时，您必须记住从数据库更新模型。此外，您必须在再次测试代码之前保存模型，否则它将使用旧模型，而不会得到您想要的结果。

Answer 2

序列创建完成后，我们可以调用 NEXTVAL('table_id_seq') 自动生成一个新值。

1.将序列链接到唯一列

ALTER TABLE ONLY 
ALTER COLUMN id 
SET DEFAULT NEXTVAL('table_id_seq');
ALTER TABLE ONLY table
    ADD CONSTRAINT table_id PRIMARY KEY (id);