Re: Returning empty on insert

On 5/16/19 7:26 AM, Winanjaya Amijoyo wrote:
> and yes .. I need both inserted pid and updated pid

The INSERT pid is going to be 'swallowed' by the CTE that is why the:

SELECT pid FROM s UNION SELECT pid FROM i

Which also means the UPDATE RETURNING pid will be equal to it.



> 
> On Thu, May 16, 2019 at 9:25 PM Winanjaya Amijoyo 
> <winanjaya.amijoyo@gmail.com <mailto:winanjaya.amijoyo@gmail.com>> wrote:
> 
>     see enclosed screenshot..
> 
>     I thought, the record still locked that's why it returns empty..
> 
>     On Thu, May 16, 2019 at 9:21 PM Adrian Klaver
>     <adrian.klaver@aklaver.com <mailto:adrian.klaver@aklaver.com>> wrote:
> 
>         On 5/16/19 7:10 AM, Winanjaya Amijoyo wrote:
>          > Hi David,
>          >
>          > thanks for your advise, as I am new with postgresql..
>          > I try to use LOCK as below, but it does not returning pid?
>          > what I missed?
> 
>         I'm not sure which pid you are referring to, the INSERT or
>         UPDATE or both?
> 
>         Can you show the output of the query?
>          >
>          > BEGIN TRANSACTION;
>          > LOCK TABLE test IN ACCESS EXCLUSIVE MODE;
>          > WITH s AS (
>          >     SELECT pid FROM test WHERE area = 'test4'
>          > ), i AS (
>          >     INSERT INTO test (area)
>          >     SELECT 'test4'
>          >     WHERE NOT EXISTS (SELECT 1 FROM s)
>          >     RETURNING pid
>          > )
>          > UPDATE area
>          > SET last_update = CURRENT_TIMESTAMP
>          > WHERE pid = (SELECT pid FROM s UNION SELECT pid FROM i)
>          > RETURNING pid;
>          > COMMIT TRANSACTION;
>          >
>          >
> 
> 
>         -- 
>         Adrian Klaver
>         adrian.klaver@aklaver.com <mailto:adrian.klaver@aklaver.com>
> 


-- 
Adrian Klaver
adrian.klaver@aklaver.com