I have a table. I wrote a function in plpgsql that inserts a row into this table:
INSERT INTO simpleTalbe (name,money) values('momo',1000) ;
This table has serial
field called id
. I want in the function after I insert the row to know the id that the new row received.
I thought to use:
select nextval('serial');
before the insert, is there a better solution?
Use the RETURNING
clause. You need to save the result somewhere inside PL/pgSQL - with an appended INTO
..
INSERT INTO simpleTalbe (name,money) values('momo',1000)
RETURNING id
INTO _my_id_variable;
_my_id_variable
must have been declared with a matching data type.
Related:
Depending on what you plan to do with it, there is often a better solution with pure SQL. Examples:
select nextval('serial');
would not do what you want; nextval()
actually increments the sequence, and then the INSERT
would increment it again. (Also, 'serial' is not the name of the sequence your serial
column uses.)
@Erwin's answer ( INSERT ... RETURNING
) is the best answer, as the syntax was introduced specifically for this situation, but you could also do a
SELECT currval('simpletalbe_id_seq') INTO ...
any time after your INSERT
to retrieve the current value of the sequence. (Note the sequence name format tablename _ columnname _seq for the automatically-defined sequence backing the serial
column.)
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