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Bug #70066 Unexpected "Cannot execute queries while other unbuffered queries"
Submitted: 2015-07-13 18:32 UTC Modified: -
Avg. Score:3.8 ± 0.7
Reproduced:4 of 4 (100.0%)
Same Version:0 (0.0%)
Same OS:0 (0.0%)
From: david at grudl dot com Assigned:
Status: Open Package: PDO MySQL
PHP Version: 5.6.11 OS:
Private report: No CVE-ID: None
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From: david at grudl dot com
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 [2015-07-13 18:32 UTC] david at grudl dot com
This code throws "SQLSTATE[HY000]: General error: 2014 Cannot execute queries while other unbuffered queries are active" on line 4.

The solution is to use exec() instead of query(), but I think that it is bug since there is no other active query.

Test script:
$pdo = new PDO('mysql:host=', '...', '...');
$pdo->setAttribute(PDO::ATTR_EMULATE_PREPARES, 0);
$pdo->query('USE nette_test');


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 [2018-06-06 17:30 UTC] kbenton at activecampaign dot com
kbenton@localhost  ~  php --version    
PHP 7.2.6 (cli) (built: May 22 2018 16:22:08) ( NTS )
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.2.0, Copyright (c) 1998-2018 Zend Technologies
 kbenton@localhost  ~  php testme.php 
Exception caught: SQLSTATE[HY000]: General error: 2014 Cannot execute queries while other unbuffered queries are active.  Consider using PDOStatement::fetchAll().  Alternatively, if your code is only ever going to run against mysql, you may enable query buffering by setting the PDO::MYSQL_ATTR_USE_BUFFERED_QUERY attribute.
 kbenton@localhost  ~  cat testme.php

try {
    $pdo = new PDO('mysql:host=', 'aql_app', '@ql_@pp');
    $pdo->setAttribute(PDO::ATTR_EMULATE_PREPARES, 0);
    $pdo->query('USE aql_db');
} catch ( Exception $e ) {
    echo "Exception caught: {$e->getMessage()}\n";
echo "Here!\n";
 kbenton@localhost  ~ 
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Last updated: Tue Dec 01 18:01:23 2020 UTC