public function __construct($strategy)
{
$dbm = array('mysql', 'mysqli', 'pgsql');
if (in_array($strategy, $dbm) === false) {
throw new Exception('Invalid parameter for Data Base Strategy');
}
try {
switch ($strategy) {
case 'mysql':
$this->strategy = mysql_db::getInstance();
break;
case 'mysqli':
$this->strategy = mysqli_db::getInstance();
break;
case 'pgsql':
$this->strategy = pgsql_db::getInstance();
break;
}
} catch (Exception $e) {
echo $e->getMessage();
}
}
public function delete_posts()
{
$M = mysqli_db::getInstance();
$sql = "DELETE FROM posts";
$M->query($sql);
}
