Gazelle/classes/class_mysql.php

<?
//-----------------------------------------------------------------------------------
/////////////////////////////////////////////////////////////////////////////////////
/*//-- MySQL wrapper class ----------------------------------------------------------

This class provides an interface to mysqli. You should always use this class instead
of the mysql/mysqli functions, because this class provides debugging features and a
bunch of other cool stuff.

Everything returned by this class is automatically escaped for output. This can be
turned off by setting $Escape to false in next_record or to_array.

//--------- Basic usage -------------------------------------------------------------

* Creating the object.

require(SERVER_ROOT.'/classes/class_mysql.php');
$DB=NEW DB_MYSQL;
-----

* Making a query

$DB->query("SELECT * FROM table...");
	Is functionally equivalent to using mysqli_query("SELECT * FROM table...")
	Stores the result set in $this->QueryID
	Returns the result set, so you can save it for later (see set_query_id())
-----

* Getting data from a query

$array = $DB->next_record();
	Is functionally equivalent to using mysqli_fetch_array($ResultSet)
	You do not need to specify a result set - it uses $this-QueryID
-----

* Escaping a string

db_string($str);
	Is a wrapper for $DB->escape_str(), which is a wrapper for
	mysqli_real_escape_string(). The db_string() function exists so that you
	don't have to keep calling $DB->escape_str().

	USE THIS FUNCTION EVERY TIME YOU USE AN UNVALIDATED USER-SUPPLIED VALUE IN
	A DATABASE QUERY!


//--------- Advanced usage ---------------------------------------------------------

* The conventional way of retrieving a row from a result set is as follows:

list($All,$Columns,$That,$You,$Select)=$DB->next_record();
-----

* This is how you loop over the result set:

while(list($All,$Columns,$That,$You,$Select)=$DB->next_record()){
	echo "Do stuff with ".$All." of the ".$Columns.$That.$You.$Select;
}
-----

* There are also a couple more mysqli functions that have been wrapped. They are:

record_count()
	Wrapper to mysqli_num_rows()

affected_rows()
	Wrapper to mysqli_affected_rows()

inserted_id()
	Wrapper to mysqli_insert_id()

close
	Wrapper to mysqli_close()
-----

* And, of course, a few handy custom functions.

to_array($Key = false)
	Transforms an entire result set into an array (useful in situations where you
	can't order the rows properly in the query).

	If $Key is set, the function uses $Key as the index (good for looking up a
	field). Otherwise, it uses an iterator.

	For an example of this function in action, check out forum.php.

collect($Key)
	Loops over the result set, creating an array from one of the fields ($Key).
	For an example, see forum.php.

set_query_id($ResultSet)
	This class can only hold one result set at a time. Using set_query_id allows
	you to set the result set that the class is using to the result set in
	$ResultSet. This result set should have been obtained earlier by using
	$DB-query().

	Example:

	$FoodRS = $DB->query("SELECT * FROM food");
	$DB->query("SELECT * FROM drink");
	$Drinks = $DB->next_record();
	$DB->set_query_id($FoodRS);
	$Food = $DB->next_record();

	Of course, this example is contrived, but you get the point.


-------------------------------------------------------------------------------------
*///---------------------------------------------------------------------------------

if (!extension_loaded('mysqli')) {
	error('Mysqli Extension not loaded.');
}

//Handles escaping
function db_string($String,$DisableWildcards=false) {
	global $DB;
	//Escape
	$String = $DB->escape_str($String);
	//Remove user input wildcards
	if ($DisableWildcards) {
		$String = str_replace(array('%','_'), array('\%','\_'), $String);
	}
	return $String;
}

function db_array($Array, $DontEscape = array(), $Quote = false) {
	foreach ($Array as $Key => $Val) {
		if(!in_array($Key, $DontEscape)) {
			if($Quote) {
				$Array[$Key] = '\''.db_string(trim($Val)).'\'';
			} else {
				$Array[$Key] = db_string(trim($Val));
			}
		}
	}
	return $Array;
}

//TODO: revisit access levels once Drone is replaced by ZeRobot
class DB_MYSQL {
	public $LinkID = false;
	protected $QueryID = false;
	protected $Record = array();
	protected $Row;
	protected $Errno = 0;
	protected $Error = '';
	
	public $Queries = array();
	public $Time = 0.0;
	
	protected $Database = '';
	protected $Server = '';
	protected $User = '';
	protected $Pass = '';
	protected $Port = 0;
	protected $Socket = '';
	
	function __construct($Database = SQLDB, $User = SQLLOGIN, $Pass = SQLPASS, $Server = SQLHOST, $Port = SQLPORT, $Socket = SQLSOCK) {
		$this->Database = $Database;
		$this->Server = $Server;
		$this->User = $User;
		$this->Pass = $Pass;
		$this->Port = $Port;
		$this->Socket = $Socket;
	}

	function halt($Msg) {
		global $LoggedUser, $Cache, $Debug, $argv;
		$DBError='MySQL: '.strval($Msg).' SQL error: '.strval($this->Errno).' ('.strval($this->Error).')';
		if ($this->Errno == 1194) { send_irc('PRIVMSG '.ADMIN_CHAN.' :'.$this->Error); }
		/*if ($this->Errno == 1194) { 
			preg_match("Table '(\S+)' is marked as crashed and should be repaired", $this->Error, $Matches);
		} */
		$Debug->analysis('!dev DB Error',$DBError,3600*24);
		if (DEBUG_MODE || check_perms('site_debug') || isset($argv[1])) {
			echo '<pre>'.display_str($DBError).'</pre>';
			if(DEBUG_MODE || check_perms('site_debug')) {
				print_r($this->Queries);
			}
			die();
		} else {
			error('-1');
		}
	}

	function connect() {
		if(!$this->LinkID) {
			$this->LinkID = mysqli_connect($this->Server, $this->User, $this->Pass, $this->Database, $this->Port, $this->Socket); // defined in config.php
			if (!$this->LinkID) {
				$this->Errno = mysqli_connect_errno();
				$this->Error = mysqli_connect_error();
				$this->halt('Connection failed (host:'.$this->Server.':'.$this->Port.')');
			}
		}
	}

   	function query($Query,$AutoHandle=1) {
   		global $LoggedUser, $Debug;
		$QueryStartTime=microtime(true);
		$this->connect();
		//In the event of a mysql deadlock, we sleep allowing mysql time to unlock then attempt again for a maximum of 5 tries
		for($i=1; $i<6; $i++) {
			$this->QueryID = mysqli_query($this->LinkID,$Query);
			if(!in_array(mysqli_errno($this->LinkID), array(1213, 1205))) {
				break;
			}
			$Debug->analysis('Non-Fatal Deadlock:',$Query,3600*24);
			trigger_error("Database deadlock, attempt $i");
			
			sleep($i*rand(2, 5)); // Wait longer as attempts increase
		}
		$QueryEndTime=microtime(true);
		$this->Queries[]=array(display_str($Query),($QueryEndTime-$QueryStartTime)*1000);
		$this->Time+=($QueryEndTime-$QueryStartTime)*1000;

		if (!$this->QueryID) {
			$this->Errno = mysqli_errno($this->LinkID);
			$this->Error = mysqli_error($this->LinkID);

			if ($AutoHandle) {
				$this->halt('Invalid Query: '.$Query);
			} else {
				return $this->Errno;
			}
		}

		$QueryType = substr($Query,0, 6);
		/*
		if ($QueryType == 'DELETE' || $QueryType == 'UPDATE') {
			if ($this->affected_rows() > 50) {
				$Debug->analysis($this->affected_rows().' rows altered:',$Query,3600*24);
			}
		}
		*/
		$this->Row = 0;
		if ($AutoHandle) { return $this->QueryID; }
	}

	function query_unb($Query) {
		$this->connect();
		mysqli_real_query($this->LinkID,$Query);
	}

	function inserted_id() {
		if($this->LinkID) {
			return mysqli_insert_id($this->LinkID);
		}
	}

	function next_record($Type=MYSQLI_BOTH, $Escape = true) { // $Escape can be true, false, or an array of keys to not escape
		if($this->LinkID) {
			$this->Record = mysqli_fetch_array($this->QueryID,$Type);
			$this->Row++;
			if (!is_array($this->Record)) {
				$this->QueryID = FALSE;
			} elseif($Escape !== FALSE){
				$this->Record = display_array($this->Record, $Escape);
			}
			return $this->Record;
		}
	}

	function close() {
		if($this->LinkID) {
			if(!mysqli_close($this->LinkID)) {
				$this->halt('Cannot close connection or connection did not open.');
			}
			$this->LinkID = FALSE;
		}
	}

	function record_count() {
		if ($this->QueryID) {
			return mysqli_num_rows($this->QueryID);
		}
	}

	function affected_rows() {
		if($this->LinkID) {
			return mysqli_affected_rows($this->LinkID);
		}
	}

	function info() {
		return mysqli_get_host_info($this->LinkID);
	}

	// You should use db_string() instead.
	function escape_str($Str) {
		$this->connect(0);
		if (is_array($Str)) {
			trigger_error('Attempted to escape array.');
			return '';
		}
		return mysqli_real_escape_string($this->LinkID,$Str);
	}

	// Creates an array from a result set
	// If $Key is set, use the $Key column in the result set as the array key
	// Otherwise, use an integer
	function to_array($Key = false, $Type = MYSQLI_BOTH, $Escape = true) {
		$Return = array();
		while($Row = mysqli_fetch_array($this->QueryID,$Type)){
			if($Escape!==FALSE) {
				$Row = display_array($Row, $Escape);
			}
			if($Key !== false) {
				$Return[$Row[$Key]] = $Row;
			} else {
				$Return[]=$Row;
			}
		}
		mysqli_data_seek($this->QueryID, 0);
		return $Return;
	}

	//  Loops through the result set, collecting the $Key column into an array
	function collect($Key, $Escape = true) {
		$Return = array();
		while($Row = mysqli_fetch_array($this->QueryID)){
			$Return[] = $Escape ? display_str($Row[$Key]) : $Row[$Key];
		}
		mysqli_data_seek($this->QueryID, 0);
		return $Return;
	}

	function set_query_id(&$ResultSet){
		$this->QueryID = $ResultSet;
		$this->Row = 0;
	}

	function beginning() {
		mysqli_data_seek($this->QueryID, 0);
	}

}
?>