Maximum length of MySQL query?

[Bert Sierra]

Does anyone know if there's an upper limit to the length of the query
string supplied to the mysql_query() function? It appears that strings
themselves can go well beyond 65,536 characters: the PHP manual does not
seem to specify the upper limit, but in one test I was able to construct
a 1,000,960 character string without a hitch.

The queries my code will construct will be considerable smaller --
between 3,500 characters and roughly 20,000 characters. Can anyone tell
me if a 20,000-character UPDATE will cause problems, given the code
below and assuming that the $updateSQL string contains valid MySQL code:

$database_VoIP_ Connection = ...;
$VoIP_Connectio n = ...;
$updateSQL = "UPDATE ... SET ... WHERE ...";
mysql_select_db ($database_VoIP _Connection, $VoIP_Connectio n);
$Result1 = mysql_query($up dateSQL, $VoIP_Connectio n) or
die(mysql_error ());

I can chop up the query into smaller pieces if need be, but I'd rather
execute a single UPDATE for speed and simplicity.
-- Bert Sierra
Tempered MicroDesigns
Prescott, AZ

[py]

Bert Sierra wrote:

Does anyone know if there's an upper limit to the length of the query
string supplied to the mysql_query() function? It appears that strings
themselves can go well beyond 65,536 characters: the PHP manual does not
seem to specify the upper limit, but in one test I was able to construct
a 1,000,960 character string without a hitch.

The queries my code will construct will be considerable smaller --
between 3,500 characters and roughly 20,000 characters. Can anyone tell
me if a 20,000-character UPDATE will cause problems, given the code
below and assuming that the $updateSQL string contains valid MySQL code:

$database_VoIP_ Connection = ...;
$VoIP_Connectio n = ...;
$updateSQL = "UPDATE ... SET ... WHERE ...";
mysql_select_db ($database_VoIP _Connection, $VoIP_Connectio n);
$Result1 = mysql_query($up dateSQL, $VoIP_Connectio n) or
die(mysql_error ());

I can chop up the query into smaller pieces if need be, but I'd rather
execute a single UPDATE for speed and simplicity.
-- Bert Sierra
Tempered MicroDesigns
Prescott, AZ

20,000-character should work fine with mysql > 4

Look here for more info:
http://www.devshed.com/c/a/MySQL/Tro...QL-Programs/4/

py