I got this error trying to access our SCADA website:
A Database Error Occurred
Unable to connect to your database server using the provided settings.
Filename: core/Loader.php
Line Number: 341
I scanned into the Loader.php file and on line 341 found this code:
$CI->db =& DB($params, $active_record);
This is the complete block with the error code:
public function database($params = '', $return = FALSE, $active_record = NULL)
{
// Grab the super object
$CI =& get_instance();
// Do we even need to load the database class?
if (class_exists('CI_DB') AND $return == FALSE AND $active_record == NULL AND isset($CI->db) AND is_object($CI->db))
{
return FALSE;
}
require_once(BASEPATH.'database/DB.php');
if ($return === TRUE)
{
return DB($params, $active_record);
}
// Initialize the db variable. Needed to prevent
// reference errors with some configurations
$CI->db = '';
// Load the DB class
$CI->db =& DB($params, $active_record);
}
The file you mention is just where the call happened when the issue happened.
The real issue is either:
Your settings in application/configuration/database.php
or
Your Database server is down, inaccessible or the credentials have changed
Related
i've moved my Kohana 2.3.4 installation to a new hosting with php7 (probably that's a root of the issue) and now i am getting the following error:
Uncaught PHP Error: Non-static method AdminHook::menu_tree() should not be called statically in file system/core/Event.php on line 209
Here's my Event.php around line 209 (call_user_func($callback); is at line 209):
public static function run($name, & $data = NULL)
{
if ( ! empty(self::$events[$name]))
{
// So callbacks can access Event::$data
self::$data =& $data;
$callbacks = self::get($name);
foreach ($callbacks as $callback)
{
call_user_func($callback); // LINE 209
}
// Do this to prevent data from getting 'stuck'
$clear_data = '';
self::$data =& $clear_data;
}
// The event has been run!
self::$has_run[$name] = $name;
}
And here's the AdminHook class:
class AdminHook {
public function menu_tree(){
$session = Session::instance();
if(isset($_GET['_ml']) AND $_GET['_ml'] == 1) {
$session->set('menuLink', 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI']);
//url::redirect(url::current());
}
global $menuLink;
$menuLink = $session->get('menuLink');
}
}
If i set menu_tree function to static, i get the following error:
Uncaught PHP Error: Declaration of Menu_Model::validate(array &$array, $save = false) should be compatible with ORM_Core::validate(Validation $array, $save = false) in file application/models/menu.php on line 18
I've been trying to find a solution for the next couple of days, but can't seem to find one. Any help is highly appreciated!
Errors are not related to each other. By simply setting that method as static, php goes to showing the next error.
You have bad Menu_Model declaration. It mut be compatible with ORM_Core::validate
Menu_Model::validate(/*bad: array & */ Validation $array, $save = false)
I have a working CodeIgniter code but once in a while i get an error.
Unable to connect to your database server using the provided settings.
Filename: core/Loader.php
Line Number: 347
It only pops up once in a while but it is so annoying.
Anything i can do about this?
Because it was asked here is the Loader code surrounding the error
public function database($params = '', $return = FALSE, $active_record = NULL)
{
// Grab the super object
$CI =& get_instance();
// Do we even need to load the database class?
if (class_exists('CI_DB') AND $return == FALSE AND $active_record == NULL AND isset($CI->db) AND is_object($CI->db))
{
return FALSE;
}
require_once(BASEPATH.'database/DB.php');
if ($return === TRUE)
{
return DB($params, $active_record);
}
// Initialize the db variable. Needed to prevent
// reference errors with some configurations
$CI->db = '';
// Load the DB class
$CI->db =& DB($params, $active_record);
}
Problem was my host not being able to handle alot of database requests. We are working on getting a better connection
I am trying to connect to my NearlyFreeSpeech MySQL database. I can login through PHPMyAdmin but not through PDO. I am using this code
$dbconn = new PDO('mysql:host=127.0.0.1;dbname='.$config['db'].'; port=3307', $config['user'], $config['pass']);
Where $config is defined in a separate file. The error I get is:
Warning: PDO::__construct() [pdo.--construct]: [2002] Connection refused (trying to connect via tcp://127.0.0.1:3307)
Error: SQLSTATE[HY000] [2002] Connection refused
and then eventually
Fatal error: Call to a member function query() on a non-object in...
If I use
mysql:host=localhost
The error I get is
Error: SQLSTATE[HY000] [2002] No such file or directory
Now I assume "Connection refused" is better than "No such file or directory", but I don't know where to go from here. Any idea why this is happening? Thank you for your help.
Try my existing functions and constant variables, you may also change those constant to an array variable you have.
define("SERVER_SQL_VERSION","mysql");
define("SQL_SERVER","localhost");
define("SQL_PORT","3306");
define("SQL_USERNAME","root");
define("SQL_PASSWORD","");
define("SQL_DB_NAME","db");
if(!function_exists('pdoConnect')) {
function pdoConnect() {
$pdo = new PDO(SERVER_SQL_VERSION.":host=".SQL_SERVER.";dbname=".SQL_DB_NAME."", "".SQL_USERNAME."", "".SQL_PASSWORD."");
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$pdo->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
return $pdo;
}
}
There might be an issue about your concatenation, this must be working...
I also seperated the SERVER_SQL_VERSION, and added a functions to check if the driver is available...I am using the XAMPP software and only mysql and sqlite is active, if you/others try to use postgresql and so on...that must be working as well.
if(!function_exists('check_sql_version')) {
function check_sql_version() {
$sql_available = false; //make it false yet
foreach(PDO::getAvailableDrivers() as $key => $val) {
if(SERVER_SQL_VERSION == $val)
{
$sql_available = true;
}
}
//check now if sql_available is true or false
if($sql_available == true)
return true;
else
return false;
}
}
So a sample should be considered:
if(!check_sql_version()) {
echo '('.SERVER_SQL_VERSION.') is not available, you only have this drivers:<br/>';
foreach(PDO::getAvailableDrivers() as $key => $val) {
$key = $key + 1;
echo $key.') '.$val.'<br/>';
}
exit(); //exit and dont proceed
}
$stmt = pdoConnect()->prepare("SELECT * FROM accounts");
$stmt->execute();
I hope it helps!
A legacy website is exhibiting unexpected behavior with it's database connections. The application connects to several MySQL databases on the same server and the original developer created a "singleton" class that holds connection objects for each of them.
Lately we have been encountering a strange behavior with the class: when a connection to www is created after creating extra, getting the instance of extra returns a connection that has the correct parameters when viewed with var_dump() but is actually connected to the www database.
What could cause this? The code has worked before at some stage. Creating a new connection on each call to getInstance() fixes the problem but I'd like to solve this the right way if possible.
<?php
class DBConnection
{
private static $default;
private static $extra;
private static $intra;
private static $www;
public static function getInstance($dbname = "default")
{
global $db; // This is an array containing database connection parameters
if(!($dbname == "default" || $dbname == "extra" || $dbname == "www" || $dbname == "intra"))
{
$dbname = "default";
}
if (empty(self::$$dbname)) // Making this pass every time fixes the problem
{
try
{
self::$$dbname = ADONewConnection('mysqlt');
if(isset($db[$dbname]))
{
self::$$dbname->connect(DBHOSTNAME, $db[$dbname]["dbusername"], $db[$dbname]["dbpassword"], $db[$dbname]["dbname"]);
}
else
{
// fallback
self::$$dbname->connect(DBHOSTNAME, DBUSERNAME, DBPASSWORD, DBNAME);
}
self::$$dbname->SetFetchMode(ADODB_FETCH_ASSOC);
self::$$dbname->execute("SET NAMES utf8");
return self::$$dbname;
}
catch(Exception $e)
{
exit("DB connection failed");
}
}
else
{
return self::$$dbname;
}
}
}
Here's a simplified example of the class misbehaving:
$cn = DBConnection::getInstance("extra");
$cn->debug = true;
$rs = $cn->execute("SELECT * FROM messages WHERE id = ".$this->id);
The last line fails with the error message "Table www.messages does not exist".
1: You don't need to establish connection in getInstance().
getInstance must not do anything, but return instance of DB class.
2: when you do self::$$dbname->connect(, if (empty(self::$$dbname)) will return you false next time you call it.
Singleton is described here: http://en.wikipedia.org/wiki/Singleton_pattern
What you have - it's just a static method.
Is it possible to give a mysql resource to a $_SESSION variable ?
//mysqldb.inc.php
class mySqlDb
{
private $link;
public function __construct($_host = '', $_db = '', $_user = '', $_pwd = '')
{
$link = mysql_pconnect(...);
}
public function query($data)
{
$r = mysql_query($data, $this->link);
return $r;
}
}
//index.php
session_start();
include_once('mysqldb.inc.php');
$sqlobj = new mySqlDb();
$sqlobj->dbconnect($db_host, $db_name, $db_user, $db_pwd);
$_SESSION['mysqldb'] = $sqlobj;
//check.php
session_start();
include_once('mysqldb.inc.php');
$sqlobj = $_SESSION['mysqldb'];
$sqlobj->query(...);
$sqlobj->query(...) return
Fatal error: main(): The script tried to execute a method or access a property of an incomplete object. Please ensure that the class definition "mySqlDb" of the object you are trying to operate on was loaded before unserialize() gets called or provide a __autoload() function to load the class definition in D:\apache\www\check.php on line 4`
If I use $_SESSION['mysqldb'] = serialize($sqlobj) and $sqlobj = unserialize($_SESSION['mysqldb']) I have this error:
Warning: mysql_query() expects parameter 2 to be resource, integer given in D:\apache\www\mysqldb.inc.php on line ...
You cannot persist php resources.
That's it - you just cannot. So you need to connect to database each time.
The $_SESSION documentation notes:
Because session data is serialized, resource variables cannot be stored in the session.
You have this:
$sqlobj = new mySqlDb();
But then you do this:
$_SESSION['mysqldb'] = $sql;
I.e. you're setting $_SESSION['mysqldb'] to an object that doesn't exist. Try $sqlobj instead.