<?PHP
//////////////////////////////////////////////////////////////////////////
// + $Id$
// +------------------------------------------------------------------+ //
// + Cake <https://developers.nextco.com/cake/>                       + //
// + Copyright: (c) 2005, Cake Authors/Developers                     + //
// + Author(s): Michal Tatarynowicz aka Pies <tatarynowicz@gmail.com> + //
// +            Larry E. Masters aka PhpNut <nut@phpnut.com>          + //
// +            Kamil Dzielinski aka Brego <brego.dk@gmail.com>       + //
// +------------------------------------------------------------------+ //
// + Licensed under The MIT License                                   + //
// + Redistributions of files must retain the above copyright notice. + //
// + See: http://www.opensource.org/licenses/mit-license.php          + //
//////////////////////////////////////////////////////////////////////////

/**
 * Purpose: DBO/ADO
 * 
 * Description: 
 * A MySQL functions wrapper. Provides ability to get results as arrays
 * and query logging (with execution time).
 *
 * Example usage:
 *
 * <code>
 * require_once('dbo_mysql.php'); // or 'dbo_postgres.php'
 *
 * // create and connect the object
 * $db = new DBO_MySQL(array( // or 'DBO_Postgres'
 *    'host'=>'localhost',
 *    'login'=>'username',
 *    'password'=>'password',
 *    'database'=>'database'));
 *
 *  // read the whole query result array (of rows)
 * $all_rows = $db->all("SELECT a,b,c FROM table");
 *
 *  // read the first row with debugging on
 *  $first_row_only = $db->one("SELECT a,b,c FROM table WHERE a=1", TRUE);
 *
 *  // emulate the usual way of reading query results
 *  if ($db->query("SELECT a,b,c FROM table")) {
 *    while ( $row = $db->farr() ) {
 *        print $row['a'].$row['b'].$row['c'];
 *  }
 * }
 *
 * // show a log of all queries, sorted by execution time
 * $db->showLog(TRUE);
 * </code>
 *
 * @filesource 
 * @author Cake Authors/Developers
 * @copyright Copyright (c) 2005, Cake Authors/Developers
 * @link https://developers.nextco.com/cake/wiki/Authors Authors/Developers
 * @package cake
 * @subpackage cake.libs
 * @since Cake v 0.2.9
 * @version $Revision$
 * @modifiedby $LastChangedBy$
 * @lastmodified $Date$
 * @license http://www.opensource.org/licenses/mit-license.php The MIT License
 *
 */

/**
 * Enter description here...
 *
 */
uses('object');

/**
 * Enter description here...
 *
 * @package cake
 * @subpackage cake.libs
 * @since Cake v 0.2.9
 */
class DBO extends Object
{

	/**
	 * Are we connected to the database?
	 *
	 * @var boolean
	 * @access public
	 */
	var $connected=FALSE;

	/**
	 * Connection configuration.
	 *
	 * @var array
	 * @access public
	 */
	var $config=FALSE;

	/**
	 * Enter description here...
	 *
	 * @var boolean
	 * @access public
	 */
	var $debug=FALSE;

	/**
	 * Enter description here...
	 *
	 * @var boolean
	 * @access public
	 */
	var $fullDebug=FALSE;

	/**
	 * Enter description here...
	 *
	 * @var unknown_type
	 * @access public
	 */
	var $error=NULL;

	/**
	 * String to hold how many rows were affected by the last SQL operation.
	 *
	 * @var unknown_type
	 * @access public
	 */
	var $affected=NULL;

	/**
	 * Number of rows in current resultset
	 *
	 * @var int
	 * @access public
	 */
	var $numRows=NULL;

	/**
	 * Time the last query took
	 *
	 * @var unknown_type
	 * @access public
	 */
	var $took=NULL;

	/**
	 * Enter description here...
	 *
	 * @var unknown_type
	 * @access private
	 */
	var $_conn=NULL;

	/**
	 * Enter description here...
	 *
	 * @var unknown_type
	 * @access private
	 */
	var $_result=NULL;

	/**
	 * Queries count.
	 *
	 * @var unknown_type
	 * @access private
	 */
	var $_queriesCnt=0;

	/**
	 * Total duration of all queries.
	 *
	 * @var unknown_type
	 * @access private
	 */
	var $_queriesTime=NULL;

	/**
	 * Enter description here...
	 *
	 * @var unknown_type
	 * @access private
	 */
	var $_queriesLog=array();

	/**
	 * Maximum number of items in query log, to prevent query log taking over
	 * too much memory on large amounts of queries -- I we've had problems at 
	 * >6000 queries on one system.
	 *
	 * @var int Maximum number of queries in the queries log.
	 * @access private
	 */
	var $_queriesLogMax=200;


	/**
	 * Constructor. Sets the level of debug for dbo (fullDebug or debug). 
	 *
	 * @param array $config
	 * @return unknown
	 */
	function __construct($config=NULL)
	{
		$this->debug = DEBUG > 0;
		$this->fullDebug = DEBUG > 1;
		parent::__construct();
		return $this->connect($config);
	}

	/**
	 * Destructor. Closes connection to the database.
	 *
	 */
	function __destructor()
	{
		$this->close();
	}

	/**
	 * Returns a string with a USE [databasename] SQL statement.
	 *
	 * @param string $db_name Name of database to use
	 * @return unknown Result of the query
	 */
	function useDb($db_name)
	{
		return $this->query("USE {$db_name}");
	}

	/**
	 * Disconnects database, kills the connection and says the connection is closed, and if DEBUG is turned on, the log for this object is shown.
	 *
	 */
	function close ()
	{
		if ($this->fullDebug) $this->showLog();
		$this->disconnect();
		$this->_conn = NULL;
		$this->connected = false;
	}

	/**
	 * Prepares a value, or an array of values for database queries by quoting and escaping them.
	 *
	 * @param mixed $data A value or an array of values to prepare.
	 * @return mixed Prepared value or array of values.
	 */
	function prepare ($data)
	{
		if (is_array($data))
		{
			$out = null;
			foreach ($data as $key=>$item)
			{
				$out[$key] = $this->prepareValue($item);
			}
			return $out;
		}
		else
		{
			return $this->prepareValue($data);
		}
	}

	function tables()
	{
		return array_map('strtolower', $this->tablesList());
	}

	/**
	 * Executes given SQL statement.
	 *
	 * @param string $sql SQL statement
	 * @return unknown
	 */
	function rawQuery ($sql)
	{
		$this->took = $this->error = $this->numRows = false;
		return $this->execute($sql);
	}

	/**
	 * Queries the database with given SQL statement, and obtains some metadata about the result 
	 * (rows affected, timing, any errors, number of rows in resultset). The query is also logged. 
	 * If DEBUG is set, the log is shown all the time, else it is only shown on errors.
	 *
	 * @param string $sql
	 * @return unknown
	 */
	function query($sql)
	{
		$t = getMicrotime();
		$this->_result = $this->execute($sql);
		$this->affected = $this->lastAffected();
		$this->took = round((getMicrotime()-$t)*1000, 0);
		$this->error = $this->lastError();
		$this->numRows = $this->lastNumRows($this->_result);
		$this->logQuery($sql);
		if (($this->debug && $this->error) || ($this->fullDebug))
		$this->showQuery($sql);

		return $this->error? false: $this->_result;
	}

	/**
	 * Returns a single row of results from the _last_ SQL query.
	 *
	 * @param resource $res
	 * @return array A single row of results
	 */
	function farr ($assoc=false)
	{
		if ($assoc === false)
		{
			return $this->fetchRow();
		}
		else
		{
			return $this->fetchRow($assoc);
		}
	}

	/**
	 * Returns a single row of results for a _given_ SQL query.
	 *
	 * @param string $sql SQL statement
	 * @return array A single row of results
	 */
	function one ($sql)
	{
		return $this->query($sql)? $this->farr(): false;
	}

	/**
	 * Returns an array of all result rows for a given SQL query. 
	 * Returns false if no rows matched.
	 *
	 * @param string $sql SQL statement
	 * @return array Array of resultset rows, or false if no rows matched
	 */
	function all ($sql)
	{
		if($this->query($sql))
		{
			$out=array();
			while ($item = $this->farr(null, true))
			{
				$out[] = $item;
			}
			return $out;
		}
		else
		{
			return false;
		}
	}

	/**
	 * Returns a single field of the first of query results for a given SQL query, or false if empty.
	 *
	 * @param string $name Name of the field
	 * @param string $sql SQL query
	 * @return unknown
	 */
	function field ($name, $sql)
	{
		$data = $this->one($sql);
		return empty($data[$name])? false: $data[$name];
	}

	/**
	 * Checks if the specified table contains any record matching specified SQL
	 *
	 * @param string $table Name of table to look in
	 * @param string $sql SQL WHERE clause (condition only, not the "WHERE" part)
	 * @return boolean True if the table has a matching record, else false
	 */
	function hasAny($table, $sql)
	{
		$out = $this->one("SELECT COUNT(*) AS count FROM {$table}".($sql? " WHERE {$sql}":""));
		return is_array($out)? $out['count']: false;
	}

	/**
	 * Checks if it's connected to the database
	 *
	 * @return boolean True if the database is connected, else false
	 */
	function isConnected()
	{
		return $this->connected;
	}

	/**
	 * Outputs the contents of the log.
	 *
	 * @param boolean $sorted
	 */
	function showLog($sorted=false)
	{
		$log = $sorted?
		sortByKey($this->_queriesLog, 'took', 'desc', SORT_NUMERIC):
		$this->_queriesLog;

		print("<table border=1>\n<tr><th colspan=7>{$this->_queriesCnt} queries took {$this->_queriesTime} ms</th></tr>\n");
		print("<tr><td>Nr</td><td>Query</td><td>Error</td><td>Affected</td><td>Num. rows</td><td>Took (ms)</td></tr>\n");

		foreach($log AS $k=>$i)
		{
			print("<tr><td>".($k+1)."</td><td>{$i['query']}</td><td>{$i['error']}</td><td align='right'>{$i['affected']}</td><td align='right'>{$i['numRows']}</td><td align='right'>{$i['took']}</td></tr>\n");
		}

		print("</table>\n");
	}

	/**
	 * Log given SQL query.
	 *
	 * @param string $sql SQL statement
	 */
	function logQuery($sql)
	{
		$this->_queriesCnt++;
		$this->_queriesTime += $this->took;

		$this->_queriesLog[] = array(
		'query'=>$sql,
		'error'=>$this->error,
		'affected'=>$this->affected,
		'numRows'=>$this->numRows,
		'took'=>$this->took
		);

		if (count($this->_queriesLog) > $this->_queriesLogMax)
		{
			array_pop($this->_queriesLog);
		}

		if ($this->error)
		return false; // shouldn't we be logging errors somehow?
	}

	/**
	 * Output information about an SQL query. The SQL statement, number of rows in resultset, 
	 * and execution time in microseconds. If the query fails, and error is output instead.
	 *
	 * @param string $sql
	 */
	function showQuery($sql)
	{
		$error = $this->error;

		if (strlen($sql)>200 && !$this->fullDebug)
		{
			$sql = substr($sql, 0, 200) .'[...]';
		}

		if ($this->debug || $error)
		{
			print("<p style=\"text-align:left\"><b>Query:</b> {$sql} <small>[Aff:{$this->affected} Num:{$this->numRows} Took:{$this->took}ms]</small>");
			if($error)
			{
				print("<br /><span style=\"color:Red;text-align:left\"><b>ERROR:</b> {$this->error}</span>");
			}
			print('</p>');
		}
	}
}

?>
{$this->_queriesCnt} queries took {$this->_queriesTime} ms
Nr	Query	Error	Affected	Num. rows	Took (ms)
".($k+1)."	{$i['query']}	{$i['error']}	{$i['affected']}	{$i['numRows']}	{$i['took']}