如何防止主串行主键被不按顺序更新的数字？

Question

CREATE TABLE u_account (
Jid serial primary key,
score int4
);

The primary key works fine (updates itself) ok when I update it like this;

INSERT INTO u_account ('score') VALUES ('122233344');

However when I insert a value like this;

INSERT INTO u_account VALUES ('122233344');

This updates the primary key;

I don't want the primary key to accept anything other than the number that is supposed to be coming next.

Someone had set it up for me before so that if I put in this code;

INSERT INTO u_account VALUES ('122233344');

it would ignore the primary key and just update score.

Please help.

Answer 1

It looks like you should just reverse the order of the two fields in your table. Then if you INSERT a single column value, it will overwrite the "score" field and use the primary key serial sequence to generate a value for the other column. This example does what I think you want:

CREATE TABLE u_account (
score int4,
Jid serial primary key
);

INSERT INTO u_account VALUES ('122233344');

Answer 2

您可以使用“默认”在主键字段中输入正确的值，例如：

INSERT INTO u_account VALUES (DEFAULT, '122233344');

Answer 3

您可以编写一个触发器，以在每次插入时将下一个序列值替换为jid列。