Re: [PHP] MySQL Increment/Decrement
Hello Ben, I had the same question yesterday (but with SQLite) and there are at least 2 solutions. The first was already mentioned: UPDATE table SET value = value + 1 WHERE foo = bar; The second solution which also works is: UPDATE table SET value = (SELECT value FROM table WHERE foo = bar) + 1 WHERE foo = bar; I hope it helps. Greetings from Germany, Sebastian Ben Miller wrote: I hope this isn't a bone-head question - Is there a MySQL query that will increment/decrement the value in an integer column with a single query - in other words, I don't have to run a SELECT query to get the value, add/subtract to/from the value, and then run an UPDATE query to store the new value? Thanks in advance. Ben -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] MySQL Increment/Decrement
On Dec 29, 2009, at 3:10 AM, muzy p...@muzybot.de wrote: Hello Ben, I had the same question yesterday (but with SQLite) and there are at least 2 solutions. The first was already mentioned: UPDATE table SET value = value + 1 WHERE foo = bar; The second solution which also works is: UPDATE table SET value = (SELECT value FROM table WHERE foo = bar) + 1 WHERE foo = bar; I hope it helps. Greetings from Germany, Sebastian Ben Miller wrote: I hope this isn't a bone-head question - Is there a MySQL query that will increment/decrement the value in an integer column with a single query - in other words, I don't have to run a SELECT query to get the value, add/subtract to/from the value, and then run an UPDATE query to store the new value? Thanks in advance. Ben -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php You may run into race conditions and contention when handling auto- incrementimg this way. Best to isolate the SQL into a transaction to avoid this Bastien Sent from my iPod -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] MySQL Increment/Decrement
I hope this isn't a bone-head question - Is there a MySQL query that will increment/decrement the value in an integer column with a single query - in other words, I don't have to run a SELECT query to get the value, add/subtract to/from the value, and then run an UPDATE query to store the new value? Thanks in advance. Ben
Re: [PHP] MySQL Increment/Decrement
Ben Miller wrote: I hope this isn't a bone-head question - Is there a MySQL query that will increment/decrement the value in an integer column with a single query - in other words, I don't have to run a SELECT query to get the value, add/subtract to/from the value, and then run an UPDATE query to store the new value? You mean: UPDATE table SET column = column + 1; ? Cheers, Rob. -- http://www.interjinn.com Application and Templating Framework for PHP -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] MySQL Increment/Decrement
UPDATE SQLTABLE SET count = (count+1) WHERE PromoID=1 Is this valid for your issue? I have no way of testing or toying On Mon, Dec 28, 2009 at 8:54 PM, Ben Miller b...@tottd.com wrote: I hope this isn't a bone-head question - Is there a MySQL query that will increment/decrement the value in an integer column with a single query - in other words, I don't have to run a SELECT query to get the value, add/subtract to/from the value, and then run an UPDATE query to store the new value? Thanks in advance. Ben
Re: [PHP] MySQL Increment/Decrement
Ben It seems that you can just update the column with a update query like this, update table set field = field + 1 where some condition This might be the thing you need. Eric On 12/29/09, Ben Miller b...@tottd.com wrote: I hope this isn't a bone-head question - Is there a MySQL query that will increment/decrement the value in an integer column with a single query - in other words, I don't have to run a SELECT query to get the value, add/subtract to/from the value, and then run an UPDATE query to store the new value? Thanks in advance. Ben
