yes you are right!.. the insert was swallowed I tried below:
WITH s AS ( SELECT pid,area FROM test WHERE area = '11' ), i AS ( INSERT INTO test (area) SELECT '11' WHERE NOT EXISTS (SELECT 1 FROM s) RETURNING pid ) UPDATE test SET last_update = CURRENT_TIMESTAMP WHERE pid = (SELECT pid FROM s UNION SELECT pid FROM i) Or pid = (SELECT pid FROM s Where area = '11') RETURNING pid; insert does not returning pid On Thu, May 16, 2019 at 9:51 PM Adrian Klaver <adrian.kla...@aklaver.com> wrote: > On 5/16/19 7:25 AM, Winanjaya Amijoyo wrote: > > see enclosed screenshot.. > > > > I thought, the record still locked that's why it returns empty.. > > I'm not sure I believe that screenshot. For one I don't know why it > showing the area and last_update as they are not being returned? > > Try the query in psql and see what happens. As an example: > > update check_test set fld_1 = '67' where id =1 returning id; > id > ---- > 1 > (1 row) > > UPDATE 1 > > > > > > On Thu, May 16, 2019 at 9:21 PM Adrian Klaver <adrian.kla...@aklaver.com > > <mailto:adrian.kla...@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.kla...@aklaver.com <mailto:adrian.kla...@aklaver.com> > > > > > -- > Adrian Klaver > adrian.kla...@aklaver.com >
