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Request #48859 PDO mysql does not support multiple inital queries
Submitted: 2009-07-08 22:59 UTC Modified: 2010-09-06 10:59 UTC
Votes:9
Avg. Score:2.3 ± 1.6
Reproduced:5 of 5 (100.0%)
Same Version:0 (0.0%)
Same OS:2 (40.0%)
From: techi at techi dot name Assigned:
Status: Wont fix Package: *General Issues
PHP Version: 5.2.10 OS: *
Private report: No CVE-ID: None
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 [2009-07-08 22:59 UTC] techi at techi dot name 
Description:
------------
When using intial SQL query with PDO::MYSQL_ATTR_INIT_COMMAND, only one 
query can be queried. More queries throws exception SQLSTATE[HY000]: 
General error: 2014

I am not sure, if this is bug or feature or some PDO limitation, but 
sometimes more than one initial query is needed

Reproduce code:
---------------
$pdo = new PDO( 
    'mysql:host=hostname;dbname=defaultDbName', 
    'username', 
    'password', 
    array(PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES utf8;SET time_zone = 'Europe/Prague'") 
); 


Actual result:
--------------
SQLSTATE[HY000]: General error: 2014

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 [2009-07-22 07:46 UTC] kalle@php.net 
The question here is trival, because internally we use mysql_options(MYSQL_INIT_COMMAND) which does not support multiple queries then. We could probably work around it with some hackish code, but I'll leave this up to the mysql guys to judge
 [2009-11-19 00:12 UTC] Ivo at UFO-Net dot nl 
The following workaround works for me:
SET NAMES utf8,time_zone = '+0:00'

This is possible at least for SET commands. More information about SET is available in the MySQL manual: http://dev.mysql.com/doc/refman/5.1/en/set-option.html. It states that "A SET  statement can contain multiple variable assignments, separated by commas."
 [2010-09-06 10:59 UTC] uw@php.net
-Status: Open +Status: Wont fix -Package: Feature/Change Request +Package: *General Issues
 [2010-09-06 10:59 UTC] uw@php.net 
It is a security and portability matter: you do not want to allow the execution of multiple statement per one operation by default. It opens up the door for SQL injection. Disabling the feature by default is also what mysqli does. 

Also, it is a matter of portability - shouldn't PDO try to use portable defaults?
 
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