[RESOLVED] PDO connection caching !!!

hi

I have mad my website locally and it works fine, but when I upload it I get this error message:

Fatal error: Call to a member function fetch() on a non-object in /home/rdisast/public_html/class.php on line 63

for debugging, I have changed the password of db connection to a wrong password, but I didn't get "unable to connect" message, the same error appears

is it possible that this is cache or something else?

I think, your query might have failed and have returned a FALSE, instead of the resultset. So, you might have been trying to fetch rows from this without checking whether the query have returned a resultset or a FALSE value.

Example:

Code:

---

$r = $db->query("SELECT something FROM shelf");
if( $r === false )
{
  echo 'Sorry, the query failed!';
}
else
{
  // fetch rows...
}

---

:wave:

thanks for replay akhileshbc

yes, it returns false, but why does it return false while I have tested the sql statement at phpMyAdmin and it works !!!

here is my code :

PHP Code:

---

<?php
class myClass
{
    public $dbh;
    public function __construct()
    {
        $this->dbh = new PDO('mysql:host=localhost;rdisast_db', 'rdisast_user', '$+f~65G@e');
    }
    public function getFieldData($tableName, $fieldNumber, $value, $columnName)
    {
        $sth = $this->dbh->query("SELECT * FROM `$tableName` WHERE `$columnName`='$value'");
        $fetch = $sth->fetch();
        return $fetch[$fieldNumber];
    }
    public function preLang($httpReferer)
    {
        $l = '';
        $explodedReferer = explode('/',$httpReferer);
        $c = count($explodedReferer);
        for ($i = 0; $i < $c; $i++) {
            if ($explodedReferer[$i] == 'du' || $explodedReferer[$i] == 'en') {
                $l = $explodedReferer[$i];
                break;
            }
        }
        if ($l == '') {
            $l = $this->getFieldData('settings','dl','1','id');
        }
        return $l;
    }
}
$obj = new myClass;
if (!$_GET['lang']) {
    $language = $obj->preLang($_SERVER['HTTP_REFERER']);
} else {
    $language = $_GET['lang'];
}
if ($language == 'du') {
    $lKey = 2;
} else {
    $lKey = 1;
}
$tr = array();
$gT = $obj->dbh->query('SELECT * FROM `translate`');
while($t = $gT->fetch()) {
    $tr[$t['code']] = $t['word'.$lKey];
}

?>

---

the first execution of a sql statemnt is in getFieldData() function, and when I debricated it, the error become at the line of while loop "while($t = $gT->fetch()) "

I think the problem in in db connection, but I am sure of the username and password, and permissions for this user

try

PHP Code:

---

print_r($obj->$dbh->errorInfo()) 


---

thank you penagate
oh !!!!
Fatal error: Cannot access empty property in /home/rdisast/public_html/class.php on line 260

What's line 260?
Put that code after the query that fails.

For example:

PHP Code:

---

$sth = $this->dbh->query("SELECT * FROM `$tableName` WHERE `$columnName`='$value'");
if ($sth === null)
    print_r($this->dbh->errorInfo()); 


---

ok :),
this is the result
Array ( [0] => 3D000 [1] => 1046 [2] => No database selected )

the line 260 is located in getFieldData() which is $fetch = $sth->fetch();

solved: error syntax of creating PDO connection.

thank you guys :) :)