adodb-connection.inc.php

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<?php
/** 
 * @version V3.40 7 April 2003 (c) 2000-2003 John Lim ([e-mail]). All rights reserved.
 * Released under both BSD license and Lesser GPL library license. 
 * Whenever there is any discrepancy between the two licenses, 
 * the BSD license will take precedence. 
 *
 * Set tabs to 4 for best viewing.
 * 
 * Latest version is available at http://php.weblogs.com
 *
 */

	
	function ADODB_TransMonitor($dbms, $fn, $errno, $errmsg, $p1, $p2, &$thisConnection)
	{
		//print "Errorno ($fn errno=$errno m=$errmsg) ";
		
		$thisConnection->_transOK = false;
		if ($thisConnection->_oldRaiseFn) {
			$fn = $thisConnection->_oldRaiseFn;
			$fn($dbms, $fn, $errno, $errmsg, $p1, $p2,$thisConnection);
		}
	}
	
	
    /**
	 * Connection object. For connecting to databases, and executing queries.
	 */ 
	class ADOConnection {
	//
	// PUBLIC VARS 
	//
	var $dataProvider = 'native';
	var $databaseType = '';		/// RDBMS currently in use, eg. odbc, mysql, mssql					
	var $database = '';			/// Name of database to be used.	
	var $host = ''; 			/// The hostname of the database server	
	var $user = ''; 			/// The username which is used to connect to the database server. 
	var $password = ''; 		/// Password for the username. For security, we no longer store it.
	var $debug = false; 		/// if set to true will output sql statements
	var $maxblobsize = 256000; 	/// maximum size of blobs or large text fields -- some databases die otherwise like foxpro
	var $concat_operator = '+'; /// default concat operator -- change to || for Oracle/Interbase	
	var $fmtDate = "'Y-m-d'";	/// used by DBDate() as the default date format used by the database
	var $fmtTimeStamp = "'Y-m-d, h:i:s A'"; /// used by DBTimeStamp as the default timestamp fmt.
	var $true = '1'; 			/// string that represents TRUE for a database
	var $false = '0'; 			/// string that represents FALSE for a database
	var $replaceQuote = "\\'"; 	/// string to use to replace quotes
	var $charSet=false; 		/// character set to use - only for interbase
	var $metaTablesSQL = '';
	//--
	var $hasInsertID = false; 		/// supports autoincrement ID?
	var $hasAffectedRows = false; 	/// supports affected rows for update/delete?
	var $hasTop = false;			/// support mssql/access SELECT TOP 10 * FROM TABLE
	var $hasLimit = false;			/// support pgsql/mysql SELECT * FROM TABLE LIMIT 10
	var $readOnly = false; 			/// this is a readonly database - used by phpLens
	var $hasMoveFirst = false;  /// has ability to run MoveFirst(), scrolling backwards
	var $hasGenID = false; 		/// can generate sequences using GenID();
	var $hasTransactions = true; /// has transactions
	//--
	var $genID = 0; 			/// sequence id used by GenID();
	var $raiseErrorFn = false; 	/// error function to call
	var $upperCase = false; 	/// uppercase function to call for searching/where
	var $isoDates = false; /// accepts dates in ISO format
	var $cacheSecs = 3600; /// cache for 1 hour
	var $sysDate = false; /// name of function that returns the current date
	var $sysTimeStamp = false; /// name of function that returns the current timestamp
	var $arrayClass = 'ADORecordSet_array'; /// name of class used to generate array recordsets, which are pre-downloaded recordsets
	
	var $noNullStrings = false; /// oracle specific stuff - if true ensures that '' is converted to ' '
	var $numCacheHits = 0; 
	var $numCacheMisses = 0;
	var $pageExecuteCountRows = true;
	var $uniqueSort = false; /// indicates that all fields in order by must be unique
	var $leftOuter = false; /// operator to use for left outer join in WHERE clause
	var $rightOuter = false; /// operator to use for right outer join in WHERE clause
	var $ansiOuter = false; /// whether ansi outer join syntax supported
	var $autoRollback = false; // autoRollback on PConnect().
	var $poorAffectedRows = false; // affectedRows not working or unreliable
	
	var $fnExecute = false;
	var $fnCacheExecute = false;
	var $blobEncodeType = false; // false=not required, 'I'=encode to integer, 'C'=encode to char
	var $dbxDriver = false;
	
	 //
	 // PRIVATE VARS
	 //
	var $_oldRaiseFn =  false;
	var $_transOK = null;
	var $_connectionID	= false;	/// The returned link identifier whenever a successful database connection is made.	
	var $_errorMsg = '';		/// A variable which was used to keep the returned last error message.  The value will
								/// then returned by the errorMsg() function	
						
	var $_queryID = false;		/// This variable keeps the last created result link identifier
	
	var $_isPersistentConnection = false;	/// A boolean variable to state whether its a persistent connection or normal connection.	*/
	var $_bindInputArray = false; /// set to true if ADOConnection.Execute() permits binding of array parameters.
	var $autoCommit = true; 	/// do not modify this yourself - actually private
	var $transOff = 0; 			/// temporarily disable transactions
	var $transCnt = 0; 			/// count of nested transactions
	
	var $fetchMode=false;
	
	/**
	 * Constructor
	 */
	function ADOConnection()			
	{
		die('Virtual Class -- cannot instantiate');
	}
	
	/**
		Get server version info...
		
		@returns An array with 2 elements: $arr['string'] is the description string, 
			and $arr[version] is the version (also a string).
	*/
	function ServerInfo()
	{
		return array('description' => '', 'version' => '');
	}
	
	function _findvers($str)
	{
		if (preg_match('/([0-9]+\.([0-9\.])+)/',$str, $arr)) return $arr[1];
		else return '';
	}
	
	/**
	* All error messages go through this bottleneck function.
	* You can define your own handler by defining the function name in ADODB_OUTP.
	*/
	function outp($msg,$newline=true)
	{
	global $HTTP_SERVER_VARS;
	
		if (defined('ADODB_OUTP')) {
			$fn = ADODB_OUTP;
			$fn($msg,$newline);
			return;
		}
		
		if ($newline) $msg .= "<br>\n";
		
		if (isset($HTTP_SERVER_VARS['HTTP_USER_AGENT'])) echo $msg;
		else echo strip_tags($msg);
		flush();
	}
	
	/**
	 * Connect to database
	 *
	 * @param [argHostname]		Host to connect to
	 * @param [argUsername]		Userid to login
	 * @param [argPassword]		Associated password
	 * @param [argDatabaseName]	database
	 * @param [forceNew]        force new connection
	 *
	 * @return true or false
	 */	  
	function Connect($argHostname = "", $argUsername = "", $argPassword = "", $argDatabaseName = "", $forceNew = false) 
	{
		if ($argHostname != "") $this->host = $argHostname;
		if ($argUsername != "") $this->user = $argUsername;
		if ($argPassword != "") $this->password = $argPassword; // not stored for security reasons
		if ($argDatabaseName != "") $this->database = $argDatabaseName;		
		
		$this->_isPersistentConnection = false;	
		if ($fn = $this->raiseErrorFn) {
			if ($forceNew) {
				if ($this->_nconnect($this->host, $this->user, $this->password, $this->database)) return true;
			} else {
				 if ($this->_connect($this->host, $this->user, $this->password, $this->database)) return true;
			}
			$err = $this->ErrorMsg();
			if (empty($err)) $err = "Connection error to server '$argHostname' with user '$argUsername'";
			$fn($this->databaseType,'CONNECT',$this->ErrorNo(),$err,$this->host,$this->database,$this);
		} else {
			if ($forceNew) {
				if ($this->_nconnect($this->host, $this->user, $this->password, $this->database)) return true;
			} else {
				if ($this->_connect($this->host, $this->user, $this->password, $this->database)) return true;
			}
		}
		if ($this->debug) ADOConnection::outp( $this->host.': '.$this->ErrorMsg());
		
		return false;
	}	
	
	 function _nconnect($argHostname, $argUsername, $argPassword, $argDatabaseName)
	 {
	 	return $this->_connect($argHostname, $argUsername, $argPassword, $argDatabaseName);
	 }
	
	
	/**
	 * Always force a new connection to database - currently only works with oracle
	 *
	 * @param [argHostname]		Host to connect to
	 * @param [argUsername]		Userid to login
	 * @param [argPassword]		Associated password
	 * @param [argDatabaseName]	database
	 *
	 * @return true or false
	 */	  
	function NConnect($argHostname = "", $argUsername = "", $argPassword = "", $argDatabaseName = "") 
	{
		return $this->Connect($argHostname, $argUsername, $argPassword, $argDatabaseName, true);
	}
	
	/**
	 * Establish persistent connect to database
	 *
	 * @param [argHostname]		Host to connect to
	 * @param [argUsername]		Userid to login
	 * @param [argPassword]		Associated password
	 * @param [argDatabaseName]	database
	 *
	 * @return return true or false
	 */	
	function PConnect($argHostname = "", $argUsername = "", $argPassword = "", $argDatabaseName = "")
	{
		if (defined('ADODB_NEVER_PERSIST')) 
			return $this->Connect($argHostname,$argUsername,$argPassword,$argDatabaseName);
		
		if ($argHostname != "") $this->host = $argHostname;
		if ($argUsername != "") $this->user = $argUsername;
		if ($argPassword != "") $this->password = $argPassword;
		if ($argDatabaseName != "") $this->database = $argDatabaseName;		
			
		$this->_isPersistentConnection = true;	
		
		if ($fn = $this->raiseErrorFn) {
			if ($this->_pconnect($this->host, $this->user, $this->password, $this->database)) return true;
			$err = $this->ErrorMsg();
			if (empty($err)) $err = "Connection error to server '$argHostname' with user '$argUsername'";
			$fn($this->databaseType,'PCONNECT',$this->ErrorNo(),$err,$this->host,$this->database,$this);
		} else 
			if ($this->_pconnect($this->host, $this->user, $this->password, $this->database)) return true;

		if ($this->debug) ADOConnection::outp( $this->host.': '.$this->ErrorMsg());
		
		return false;
	}

	// Format date column in sql string given an input format that understands Y M D
	function SQLDate($fmt, $col=false)
	{	
		if (!$col) $col = $this->sysDate;
		return $col; // child class implement
	}
	
	/**
	 * Should prepare the sql statement and return the stmt resource.
	 * For databases that do not support this, we return the $sql. To ensure
	 * compatibility with databases that do not support prepare:
	 *
	 *   $stmt = $db->Prepare("insert into table (id, name) values (?,?)");
	 *   $db->Execute($stmt,array(1,'Jill')) or die('insert failed');
	 *   $db->Execute($stmt,array(2,'Joe')) or die('insert failed');
	 *
	 * @param sql	SQL to send to database
	 *
	 * @return return FALSE, or the prepared statement, or the original sql if
	 * 			if the database does not support prepare.
	 *
	 */	
	function Prepare($sql)
	{
		return $sql;
	}

	/**
	 * Some databases, eg. mssql require a different function for preparing
	 * stored procedures. So we cannot use Prepare().
	 *
	 * Should prepare the stored procedure  and return the stmt resource.
	 * For databases that do not support this, we return the $sql. To ensure
	 * compatibility with databases that do not support prepare:
	 *
	 * @param sql	SQL to send to database
	 *
	 * @return return FALSE, or the prepared statement, or the original sql if
	 * 			if the database does not support prepare.
	 *
	 */	
	function PrepareSP($sql)
	{
		return $this->Prepare($sql);
	}
	
	/**
	* PEAR DB Compat
	*/
	function Quote($s)
	{
		return $this->qstr($s,false);
	}

	
	/**
	* PEAR DB Compat - do not use internally. 
	*/
	function ErrorNative()
	{
		return $this->ErrorNo();
	}

	
   /**
	* PEAR DB Compat - do not use internally. 
	*/
	function nextId($seq_name)
	{
		return $this->GenID($seq_name);
	}

	/**
	*	 Lock a row, will escalate and lock the table if row locking not supported
	*	will normally free the lock at the end of the transaction
	*
	*  @param $table	name of table to lock
	*  @param $where	where clause to use, eg: "WHERE row=12". If left empty, will escalate to table lock
	*/
	function RowLock($table,$where)
	{
		return false;
	}
	
	function CommitLock($table)
	{
		return $this->CommitTrans();
	}
	
	function RollbackLock($table)
	{
		return $this->RollbackTrans();
	}
	
	/**
	* PEAR DB Compat - do not use internally. 
	*
	* The fetch modes for NUMERIC and ASSOC for PEAR DB and ADODB are identical
	* 	for easy porting :-)
	*
	* @param mode	The fetchmode ADODB_FETCH_ASSOC or ADODB_FETCH_NUM
	* @returns		The previous fetch mode
	*/
	function SetFetchMode($mode)
	{	
		$old = $this->fetchMode;
		$this->fetchMode = $mode;
		
		if ($old === false) {
		global $ADODB_FETCH_MODE;
			return $ADODB_FETCH_MODE;
		}
		return $old;
	}
	

	/**
	* PEAR DB Compat - do not use internally. 
	*/
	function &Query($sql, $inputarr=false)
	{
		$rs = &$this->Execute($sql, $inputarr);
		if (!$rs && defined('ADODB_PEAR')) return ADODB_PEAR_Error();
		return $rs;
	}

	
	/**
	* PEAR DB Compat - do not use internally
	*/
	function &LimitQuery($sql, $offset, $count)
	{
		$rs = &$this->SelectLimit($sql, $count, $offset); // swap 
		if (!$rs && defined('ADODB_PEAR')) return ADODB_PEAR_Error();
		return $rs;
	}

	
	/**
	* PEAR DB Compat - do not use internally
	*/
	function Disconnect()
	{
		return $this->Close();
	}

	/* 
	Usage in oracle
		$stmt = $db->Prepare('select * from table where id =:myid and group=:group');
		$db->Parameter($stmt,$id,'myid');
		$db->Parameter($stmt,$group,'group',64);
		$db->Execute();
		
		@param $stmt Statement returned by Prepare() or PrepareSP().
		@param $var PHP variable to bind to
		@param $name Name of stored procedure variable name to bind to.
		@param [$isOutput] Indicates direction of parameter 0/false=IN  1=OUT  2= IN/OUT. This is ignored in oci8.
		@param [$maxLen] Holds an maximum length of the variable.
		@param [$type] The data type of $var. Legal values depend on driver.

	*/
	function Parameter(&$stmt,&$var,$name,$isOutput=false,$maxLen=4000,$type=false)
	{
		return false;
	}
	
	/**
		Improved method of initiating a transaction. Used together with CompleteTrans().
		Advantages include:
		
		a. StartTrans/CompleteTrans is nestable, unlike BeginTrans/CommitTrans/RollbackTrans.
		   Only the outermost block is treated as a transaction.<br>
		b. CompleteTrans auto-detects SQL errors, and will rollback on errors, commit otherwise.<br>
		c. All BeginTrans/CommitTrans/RollbackTrans inside a StartTrans/CompleteTrans block
		   are disabled, making it backward compatible.
	*/
	function StartTrans($errfn = 'ADODB_TransMonitor')
	{
		
		if ($this->transOff > 0) {
			$this->transOff += 1;
			return;
		}
		
		$this->_oldRaiseFn = $this->raiseErrorFn;
		$this->raiseErrorFn = $errfn;
		$this->_transOK = true;
		
		if ($this->debug && $this->transCnt > 0) ADOConnection::outp("Bad Transaction: StartTrans called within BeginTrans");
		$this->BeginTrans();
		$this->transOff = 1;
	}
	
	/**
		Used together with StartTrans() to end a transaction. Monitors connection
		for sql errors, and will commit or rollback as appropriate.
		
		@autoComplete if true, monitor sql errors and commit and rollback as appropriate, 
		and if set to false force rollback even if no SQL error detected.
		@returns true on commit, false on rollback.
	*/
	function CompleteTrans($autoComplete = true)