upsert 到返回最后一条记录的 id 的表 upsert

Question

I have a very simple upsert I am trying to make work but unsuccessfully so far.我有一个非常简单的 upsert，我正在努力工作，但到目前为止没有成功。

Consider the table:考虑下表：

CREATE TABLE bla(id TEXT PRIMARY KEY, data INT);

and the insert:和插入：

INSERT INTO bla(id, data) VALUES('12wed', 23) RETURNING (id);

And so far so good.到目前为止一切都很好。

The logic I am trying to implement though is the following:我试图实现的逻辑如下：

if no record with id=id: 
    insert and return id, 
else:
    do nothing

I tried我试过了

INSERT INTO bla(id, data) VALUES('12wed', 23) 
RETURNING (id) 
ON CONFLICT(id) DO NOTHING;

But I get the following error:但我收到以下错误：

ERROR:  syntax error at or near "ON"
LINE 3: ON CONFLICT(id) DO NOTHING;

Answer 1

You made a mistake with the expression.你在表达上犯了一个错误。 The correct version:正确的版本：

INSERT INTO bla(id, data) VALUES('12wed', 23) 
ON CONFLICT(id) DO NOTHING
RETURNING (id);

It's exactly what you want:这正是您想要的：

hh=# INSERT INTO bla(id, data) VALUES('12wed', 23) ON CONFLICT(id) DO NOTHING RETURNING (id);
 id 
----
(0 rows)

INSERT 0 0

hh=# INSERT INTO bla(id, data) VALUES('12wed_new', 23) ON CONFLICT(id) DO NOTHING RETURNING (id);
   id   
--------
 12wed_new
(1 row)

INSERT 0 1