Re: [PHP-DB] general theory behind 'primary_key' 'auto_increment' flags, and ON DUPLICATE KEY UPDATE ?
On Wed, Jul 15, 2009 at 9:21 AM, Govindagovinda.webdnat...@gmail.com wrote: Reading docs.. I want to be sure of things... have your verification of my understanding(s)- Does setting a mysql db column (say myPrimarykeyID) with the 'primary_key' 'auto_increment' flags totally negate the logic for ever having to use ON DUPLICATE KEY UPDATE in an INSERT? Or is it that I can do an INSERT with SET myPrimarykeyID=someAlreadyExistingVal, a=1, b=2 ON DUPLICATE KEY UPDATE a=edited1, b=edited2 ... I am trying to learn/work out the mysql/php code that will allow me to either create *or* edit a record, in one fell swoop. Thanks for any insight! -Govinda -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php If that is the goal use the REPLACE INTO sql syntax You really don't want to allow duplicates in primary keys, that completely negates the usefulness of that key -- Bastien Cat, the other other white meat -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP-DB] general theory behind 'primary_key' 'auto_increment' flags, and ON DUPLICATE KEY UPDATE ?
On Jul 15, 2009, at 7:37 AM, Bastien Koert wrote: On Wed, Jul 15, 2009 at 9:21 AM, Govindagovinda.webdnat...@gmail.com wrote: Reading docs.. I want to be sure of things... have your verification of my understanding(s)- Does setting a mysql db column (say myPrimarykeyID) with the 'primary_key' 'auto_increment' flags totally negate the logic for ever having to use ON DUPLICATE KEY UPDATE in an INSERT? Or is it that I can do an INSERT with SET myPrimarykeyID=someAlreadyExistingVal, a=1, b=2 ON DUPLICATE KEY UPDATE a=edited1, b=edited2 ... I am trying to learn/work out the mysql/php code that will allow me to either create *or* edit a record, in one fell swoop. Thanks for any insight! -Govinda -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php If that is the goal use the REPLACE INTO sql syntax You really don't want to allow duplicates in primary keys, that completely negates the usefulness of that key well isn't it that in order for the REPLACE INTO to replace the old row I have to try and replace a row with an already existing uniqueID? The same thing I would do to cause the INSERT.. SET .. ON DUPLICATE KEY UPDATE to kick in? Don't both methods equally effectively 'prevent duplicate primary keys from occurring'? -G
Re: [PHP-DB] general theory behind 'primary_key' 'auto_increment' flags, and ON DUPLICATE KEY UPDATE ?
On Wed, Jul 15, 2009 at 4:40 PM, Govindagovinda.webdnat...@gmail.com wrote: On Jul 15, 2009, at 7:37 AM, Bastien Koert wrote: On Wed, Jul 15, 2009 at 9:21 AM, Govindagovinda.webdnat...@gmail.com wrote: Reading docs.. I want to be sure of things... have your verification of my understanding(s)- Does setting a mysql db column (say myPrimarykeyID) with the 'primary_key' 'auto_increment' flags totally negate the logic for ever having to use ON DUPLICATE KEY UPDATE in an INSERT? Or is it that I can do an INSERT with SET myPrimarykeyID=someAlreadyExistingVal, a=1, b=2 ON DUPLICATE KEY UPDATE a=edited1, b=edited2 ... I am trying to learn/work out the mysql/php code that will allow me to either create *or* edit a record, in one fell swoop. Thanks for any insight! -Govinda -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php If that is the goal use the REPLACE INTO sql syntax You really don't want to allow duplicates in primary keys, that completely negates the usefulness of that key well isn't it that in order for the REPLACE INTO to replace the old row I have to try and replace a row with an already existing uniqueID? The same thing I would do to cause the INSERT.. SET .. ON DUPLICATE KEY UPDATE to kick in? Don't both methods equally effectively 'prevent duplicate primary keys from occurring'? -G REPLACE will do the same thing as an DELETE where KEY = and then an INSERT or just does an insert if the KEY is not present -- Bastien Cat, the other other white meat -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
