At 21:36 -0700 4/7/02, Son Nguyen wrote: >--- BD <[EMAIL PROTECTED]> wrote: >> Son, >> >> At 09:48 PM 4/7/2002, you wrote: >> >mysql> desc threads; >> >>+-------------+--------------+------+-----+---------+----------------+ >> >| Field | Type | Null | Key | Default | Extra >> | >> >>+-------------+--------------+------+-----+---------+----------------+ >> >| thread_ID | int(11) | | PRI | NULL | auto_increment >> | >> >| subject | varchar(255) | YES | | NULL | >> | >> >| author | varchar(30) | YES | | NULL | >> | >> >| last_by | varchar(30) | YES | | NULL | >> | >> >| views | int(11) | | | 0 | >> | >> >| date_posted | datetime | YES | | NULL | >> | >> >>+-------------+--------------+------+-----+---------+----------------+ >> >6 rows in set (0.00 sec) >> > >> > $SQL_insert_thread = "INSERT into threads "; >> > $SQL_insert_thread .= "(subject, author, last_by, views, "; >> > $SQL_insert_thread .= "date_posted) " values "; >> > $SQL_insert_thread .= "(\'some_subject\', \'test_username\', >> > $SQL_insert_thread .= "\'test_username\', 1, now())"; >> > >> > In the table threads above, I do have a field: "thread_ID" with >> >auto_increment value. My question is can I obtain the value >> thread_ID >> >while I do the insert statement just by 1 mySQL statement? If yes, >> >please can somebody give me a sample code?
No. You have to create the record first in order to generate the AUTO_INCREMENT value. > > >> execute the MySQL query: select last_insert_id(); > >1st: select last_insert_id() doesn't work It should. > >2nd: It's not the answer I am looking for ... Because of the race >condition if two users access the that script at the same time... I >will have when I leave the INSERT statement !!! There is no race condtion. LAST_INSERT_ID() is designed to avoid that problem; it's connection-specific, so it doesn't matter what other users are doing. This is explained in the MySQL manual. > >Here is what I mean: think about this situation: > >USER 1 ===> INSERT > STOP <== due to process scheduling > >USER 2 ===> INSERT > SELECT last_insert_id(); > >USER 1 ===> SELECT last_insert_id(); > >It's the race condition, I am talking about. LAST_INSERT_ID() makes the race condition irrelevant. --------------------------------------------------------------------- Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail <[EMAIL PROTECTED]> To unsubscribe, e-mail <[EMAIL PROTECTED]> Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
