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<?php | |
/* | |
* Mysql database class - only one connection alowed | |
*/ | |
class Database { | |
private $_connection; | |
private static $_instance; //The single instance | |
private $_host = "HOSTt"; | |
private $_username = "USERNAME"; | |
private $_password = "PASSWORd"; | |
private $_database = "DATABASE"; | |
/* | |
Get an instance of the Database | |
@return Instance | |
*/ | |
public static function getInstance() { | |
if(!self::$_instance) { // If no instance then make one | |
self::$_instance = new self(); | |
} | |
return self::$_instance; | |
} | |
// Constructor | |
private function __construct() { | |
$this->_connection = new mysqli($this->_host, $this->_username, | |
$this->_password, $this->_database); | |
// Error handling | |
if(mysqli_connect_error()) { | |
trigger_error("Failed to conencto to MySQL: " . mysql_connect_error(), | |
E_USER_ERROR); | |
} | |
} | |
// Magic method clone is empty to prevent duplication of connection | |
private function __clone() { } | |
// Get mysqli connection | |
public function getConnection() { | |
return $this->_connection; | |
} | |
} | |
?> |
I get error
Fatal error: Uncaught Error: Call to a member function query() on null in C:\xampp\htdocs\wp-top-promo\index.php:127 Stack trace: #0 {main} thrown in C:\xampp\htdocs\wp-top-promo\index.php on line 127
` <?php
//-- Custom Constantinos Accessories MySQLi Connection Class --//
class ca_db {
private $ca_conn;
private static $ca_instance;
private $ca_servername = "localhost";
private $ca_username = "root";
private $ca_password = "";
private $ca_dbname = "coupons_db";
public static function getInstance() {
if(!self::$ca_instance) { // If no instance then make one
self::$ca_instance = new self();
}
return self::$ca_instance;
}
private function __construct() {
$ca_conn = new mysqli($this->ca_servername, $this->ca_username, $this->ca_password, $this->ca_dbname);
// Check connection
if(mysqli_connect_error()) {
trigger_error("Failed to conencto to MySQL: " . mysql_connect_error(),
E_USER_ERROR);
}
}
// Magic method clone is empty to prevent duplication of connection
private function __clone() { }
// Get mysqli connection
public function getConnection() {
return $this->ca_conn;
}
}
$db = ca_db::getInstance();
$mysqli = $db->getConnection();
$sql = "SELECT id FROM wp_posts WHERE post_type = 'shop_coupon' AND post_title != 'deals' AND post_status = 'publish'";
$active = $mysqli->query($sql);
echo $active;`
Im beginner, so I'm stuck!
Any suggestions?!
Hi,
How do I add ? charset=utf8
Hi,
How do I add ? charset=utf8
https://gist.github.com/jonashansen229/4534794#gistcomment-2790773
Why this whole new self()
and getInstance()
plus getConnection()
thing? Wouldn't it be much easier to just do this:
class Database {
// Database credentials
private static $config = [
'host' => '',
'base' => '',
'user' => '',
'pass' => ''
];
protected static $instance = null;
private function __construct() {}
private function __clone() {}
public static function getInstance() {
if(!self::$instance) {
self::$instance = new mysqli(
self::$config['host'],
self::$config['user'],
self::$config['pass'],
self::$config['base']
);
}
return self::$instance;
}
}
If you want you can now add a __callStatic($method, $arguments)
method that calls self::getInstance()
, and use it as easy as this:
foreach (Database::query("_your query_") as $row) ...
Or do I get this whole thing wrong?!
I feel like i should know this stuff already I think i have used it before but right now i have had some time away from coding due to life happening and now i can't seem to get my brain to cooperate with what i am trying to get done,
so I started putting together a simple user system and with a simple connection everything worked fine once i changed to this DB class file and included it simple things became broken and i just can not seem to work it out so my original sql select query was a prepared statement,
$sql = "SELECT * FROM users WHERE username=? AND password=? AND user_type=?"; $stmt = $mysqli->prepare($sql); $stmt->bind_param("sss",$username,$password,$userType); $stmt->execute(); $result = $stmt->get_result(); $row = $result->fetch_assoc();
this was working just fine with the standard inline connection, now with the class file included i get
"Fatal error: Uncaught Error: Call to a member function prepare() on null in /homepages/15/d842734408/htdocs/MURB/index.php:22 Stack trace: #0 {main} thrown in"
can anyone please correct my line of thinking on this so i can move on and remember what i need here please
To set the default charset and collation, like this: http://php.net/manual/en/mysqli.set-charset.php#122858
private function __construct() {
$this->_connection = new mysqli($this->_host, $this->_username, $this->_password, $this->_database);
// error
if ($this->_connection->connect_error) {
trigger_error("Connection Error: ".$this->_connection->connect_error(), E_USER_ERROR);
} else {
// set charset & collation
$this->_connection->set_charset('utf8mb4');
$this->_connection->query('SET collation_connection = @@collation_database;');
}
}