class db_mysql
{
/**
* Class instance
*
* @var object
*/
private static $instance;
/**
* Connection to MySQL.
*
* @var string
*/
protected $link;
/**
* Holds the most recent connection.
*
* @var string
*/
protected $recent_link = null;
/**
* Holds the contents of the most recent SQL query.
*
* @var string
*/
protected $sql = '';
/**
* Holds the number of queries executed.
*
* @var integer
*/
public $query_count = 0;
/**
* The text of the most recent database error message.
*
* @var string
*/
protected $error = '';
/**
* The error number of the most recent database error message.
*
* @var integer
*/
protected $errno = '';
/**
* Do we currently have a lock in place?
*
* @var boolean
*/
protected $is_locked = false;
/**
* Show errors? If set to true, the error message/sql is displayed.
*
* @var boolean
*/
public $show_errors = false;
/**
* Database host
*
* @var string
*/
protected static $db_host;
/**
* Database username
*
* @var string
*/
protected static $db_user;
/**
* Database password
*
* @var string
*/
protected static $db_pass;
/**
* Database name.
*
* @var string
*/
protected static $db_name;
/**
* Constructor. Initializes a database connection and selects our database.
*
* private, cannot be accessed directly outside of this class
*
* @param string $db_host Database host
* @param string $db_user Database username
* @param string $db_pass Database password
* @param string $db_name Database name
* @return boolean Connection resource, if database connection is established.
*/
private function __construct()
{
self::set_params();
$this->link = @mysql_connect(self::$db_host, self::$db_user, self::$db_pass);
if (is_resource($this->link) AND @mysql_select_db(self::$db_name, $this->link))
{
$this->recent_link =& $this->link;
return $this->link;
}
else
{
// If we couldn't connect or select the db...
$this->raise_error('db_mysql::__construct() - Could not select and/or connect to database: ' . self::$db_name);
}
}
/**
* Creates an instance of the class.
*
* @param void
* @return object
*/
public static function getInstance()
{
if (!self::$instance)
{
self::$instance = new self();
}
return self::$instance;
}
/**
* Sets connection/database parameters.
*
* @param void
* @return void
*/
protected static function set_params()
{
global $dbconfig;
self::$db_host = $dbconfig['host'];
self::$db_user = $dbconfig['user'];
self::$db_pass = $dbconfig['pass'];
self::$db_name = $dbconfig['name'];
}
/**
* Executes a sql query. If optional $only_first is set to true, it will
* return the first row of the result as an array.
*
* @param string Query to run
* @param bool Return only the first row, as an array?
* @return mixed
*/
public function query($sql, $only_first = false)
{
$this->recent_link =& $this->link;
$this->sql =& $sql;
$result = @mysql_query($sql, $this->link);
$this->query_count++;
if ($only_first)
{
$return = $this->fetch_array($result);
$this->free_result($result);
return $return;
}
return $result;
}
/**
* Fetches a row from a query result and returns the values from that row as an array.
*
* @param string The query result we are dealing with.
* @return array
*/
public function fetch_array($result)
{
return @mysql_fetch_assoc($result);
}
/**
* Will fetch all records from the database, and will optionally return the
* value of a single field from all records.
*
* @param string $sql SQL Query string
* @param string $field Field/column
* @return array Will return array of all db records.
*/
public function fetch_all($sql, $field = '')
{
$return = array();
if (($result = $this->query($sql)))
{
while ($row = $this->fetch_array($result))
{
$return[] = ($field) ? $row[$field] : $row;
}
$this->free_result($result);
}
return $return;
}
/**
* Returns the number of rows in a result set.
*
* @param string The query result we are dealing with.
* @return integer
*/
public function num_rows($result)
{
return @mysql_num_rows($result);
}
/**
* Retuns the number of rows affected by the most recent query
*
* @return integer
*/
public function affected_rows()
{
return @mysql_affected_rows($this->recent_link);
}
/**
* Returns the number of queries executed.
*
* @param none
* @return integer
*/
public function num_queries()
{
return $this->query_count;
}
/**
* Lock database tables
*
* @param array Array of table => lock type
* @return void
*/
public function lock($tables)
{
if (is_array($tables) AND count($tables))
{
$sql = '';
foreach ($tables AS $name => $type)
{
$sql .= (!empty($sql) ? ', ' : '') . "$name $type";
}
$this->query("LOCK TABLES $sql");
$this->is_locked = true;
}
}
/**
* Unlock tables
*/
public function unlock()
{
if ($this->is_locked)
{
$this->query("UNLOCK TABLES");
$this->is_locked = false;
}
}
/**
* Returns the ID of the most recently inserted item in an auto_increment field
*
* @return integer
*/
public function insert_id()
{
return @mysql_insert_id($this->link);
}
/**
* Escapes a value to make it safe for using in queries.
*
* @param string Value to be escaped
* @param bool Do we need to escape this string for a LIKE statement?
* @return string
*/
public function prepare($value, $do_like = false)
{
$value = stripslashes($value);
if ($do_like)
{
$value = str_replace(array('%', '_'), array('\%', '\_'), $value);
}
return mysql_real_escape_string($value, $this->link);
}
/**
* Frees memory associated with a query result.
*
* @param string The query result we are dealing with.
* @return boolean
*/
public function free_result($result)
{
return @mysql_free_result($result);
}
/**
* Turns database error reporting on
*/
public function show_errors()
{
$this->show_errors = true;
}
/**
* Turns database error reporting off
*/
public function hide_errors()
{
$this->show_errors = false;
}
/**
* Closes our connection to MySQL.
*
* @param none
* @return boolean
*/
public function close()
{
$this->sql = '';
return @mysql_close($this->link);
}
/**
* Returns the MySQL error message.
*
* @param none
* @return string
*/
public function error()
{
$this->error = (is_null($this->recent_link)) ? '' : mysql_error($this->recent_link);
return $this->error;
}
/**
* Returns the MySQL error number.
*
* @param none
* @return string
*/
function errno()
{
$this->errno = (is_null($this->recent_link)) ? 0 : mysql_errno($this->recent_link);
return $this->errno;
}
/**
* Gets the url/path of where we are when a MySQL error occurs.
*
* @access private
* @param none
* @return string
*/
protected function get_error_path()
{
if ($_SERVER['REQUEST_URI'])
{
$errorpath = $_SERVER['REQUEST_URI'];
}
else
{
if ($_SERVER['PATH_INFO'])
{
$errorpath = $_SERVER['PATH_INFO'];
}
else
{
$errorpath = $_SERVER['PHP_SELF'];
}
if ($_SERVER['QUERY_STRING'])
{
$errorpath .= '?' . $_SERVER['QUERY_STRING'];
}
}
if (($pos = strpos($errorpath, '?')) !== false)
{
$errorpath = urldecode(substr($errorpath, 0, $pos)) . substr($errorpath, $pos);
}
else
{
$errorpath = urldecode($errorpath);
}
return $_SERVER['HTTP_HOST'] . $errorpath;
}
/**
* If there is a database error, the script will be stopped and an error message displayed.
*
* @param string The error message. If empty, one will be built with $this->sql.
* @return string
*/
public function raise_error($error_message = '')
{
if ($this->recent_link)
{
$this->error = $this->error($this->recent_link);
$this->errno = $this->errno($this->recent_link);
}
if ($error_message == '')
{
$this->sql = "Error in SQL query:\n\n" . rtrim($this->sql) . ';';
$error_message =& $this->sql;
}
else
{
$error_message = $error_message . ($this->sql != '' ? "\n\nSQL:" . rtrim($this->sql) . ';' : '');
}
$message = htmlspecialchars("$error_message\n\nMySQL Error: {$this->error}\nError #: {$this->errno}\nFilename: " . $this->get_error_path());
$message = '<code>' . nl2br($message) . '</code>';
if (!$this->show_errors)
{
$message = "<!--\n\n$message\n\n-->";
}
die("There seems to have been a slight problem with our database, please try again later.<br /><br />\n$message");
}
}
that was a secure class i used to write long time ago its easy use for sure here is an example
$dbconfig = array(
'host' => SERVER,
'user' => USER,
'pass' => PASSWORD,
'name' => DBNAME
);
$db = db_mysql::getInstance();
$getmaxcategories = $db->query("SELECT * FROM categories");
if($db->num_rows($getmaxcategories) != "0")
{
while($row = $db->fetch_array($getmaxcategories))
{
//do something
}
}
you can use foreach for loop or whatever
