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20. Appendix H Sybase SQL Server DB Wrapper Example

Submitted by: Joe Thong darkjoe@softhome.net Site URL: http://phpdb.linuxbox.com

Description: A PHP database wrapper for various database servers with a powerful Recordset for result data manipulation. Database results are flushed automatically by phpDB.

To get this file, in the web-browser, save this file as 'Text' type as phpDB-sybase.lib


<?php
/*
Name: phpDB Sybase module
Version: 1.02bR6
Description: A PHP database wrapper for various database 
        servers with a powerful Recordset for result data 
        manipulation.  Database results are flushed 
        automatically by phpDB.  
*/

// Define this module, to prevent double class declaration
if (!defined("_PHPDB_ABSTRACT_LAYER")) {
        define("_PHPDB_ABSTRACT_LAYER", 1 );
}
else
        return;

//-------------------------------
         Class Name: phpDB
//-------------------------------
class phpDB 
{
        /*      public variables        */
        var $version = '1.02bR6'; // Version number of phpDB
        // This variable keeps what database type is going 
        // to be used.  Current supported database server 
        // are MySQL, MSQL, SQL Server, and Sybase
        var $databaseType = ''; 
        // Specifies which database is going to be used
        var $databaseName = ''; 
        // The hostname of the database server, port number 
        // is optional.  e.g: "db.devNation.com"
        var $hostname = '';
        var $username = '';     // to connect to the database server
        var $password = ''; // Password for the username

        // Private variables --- starts with underscore
        // An array of executed querys.  For results 
        // cleanup purposes
        var $_queryIDList       = array();      
        // The returned link identifier whenever a successful 
        // database connection is made
        var $_connectionID      = -1;   
        // A variable which was used to keep the returned last 
        // error message.  The value will then returned by 
        // the errorMsg() function
        var $_errorMsg = '';
        // This variable keeps the last created result 
        // link identifier
        var $_queryID = -1;     
        // A boolean variable to state whether its a 
        // persistent connection or normal connection
        var     $_isPersistentConnection = false;       
        // Holds the newly created result object, returned 
        // via the execute() method
        var $_tempResultObj = '';

        // A constructor function for the phpDB object.  When 
        // initializing, specify the dbType i.e: "mysql", 
        // "msql", "postgresql", "mssql", and "sybase"
        function phpDB($dbType = "sybase") 
        {
                switch ($dbType) {
                        case "mysql":
                        case "msql":
                        case "postgresql":
                        case "mssql":
                        case "sybase":                                          
                        case "informix":                                                
                                $this->databaseType = $dbType;
                                break;
                        default:
                                return false;
                }                       
        }
        
        // Returns: A positive link identifier on success, or
        // false on error.      Connect to the server with the 
        // provided arguments. The connection to the server will be 
        // closed when the script terminates, unless close()
        // function is called beforehand
        function connect($argHostname = "", $argUsername = "", 
                $argPassword = "", $argDatabaseName = "") 
        {
                $boolDBSelected;
                if ($argHostname != "") {
                        $this->hostname = $argHostname;
                }
                if ($argUsername != "") {
                        $this->username = $argUsername;
                }
                if ($argPassword != "") {
                        $this->password = $argPassword;
                }
                if ($argDatabaseName != "") {
                        $this->databaseName = $argDatabaseName;
                }                               
                
                $this->_connectionID = @sybase_connect($this->hostname, $this->username, $this->password);
                
                if ($this->databaseName && $this->_connectionID) {
                        $boolDBSelected = @sybase_select_db($this->databaseName);
                        /*      If DB selection fails   */
                        if(!$boolDBSelected) {  
                                /*      Close the current connection    */
                                @sybase_close($this->_connectionID);
                                return false;   
                        }
                }               
                return $this->_connectionID;
        }

        // Returns: A positive link identifier on success, or false 
        // on error.  Connect to the server with the provided 
        // arguments. The connection to the server will not be closed
        // when the script terminates. Instead it will be kept for later future use
        function pconnect($argHostname = "", $argUsername = "", 
                $argPassword = "", $argDatabaseName = "") 
        {
                $boolDBSelected;
                if ($argHostname != "") {
                        $this->hostname = $argHostname;
                }
                if ($argUsername != "") {
                        $this->username = $argUsername;
                }
                if ($argPassword != "") {
                        $this->password = $argPassword;
                }
                if ($argDatabaseName != "") {
                        $this->databaseName = $argDatabaseName;
                }                               
                
                $this->_connectionID = @sybase_pconnect($this->hostname, $this->username, $this->password);
                if ($this->_connectionID) {
                        $this->_isPersistentConnection = true;                          
                }
                
                if ($this->databaseName && $this->_connectionID) {
                        $boolDBSelected = @sybase_select_db($this->databaseName);
                        /*      if DB selection fails   */
                        if(!$boolDBSelected) {
                                /*      Persistent connection can't be closed   */
                                return false;   
                        }
                }               
                return $this->_connectionID;
        }
        
        /*      Returns: true on success, false on error 
                Select the database name to be used     */
        function selectDB($dbName) {
                $this->databaseName = $dbName;
                if ($this->_connectionID) {
                        return @sybase_select_db($dbName);              
                }
                else {
                        /*      No database selected    */
                        return false;
                }                       
        }

        /*      Returns: the Recordset object disregard success or failure
                Send the sql statement to the database server.  */
        function execute($sql = "") {
                $this->_queryID = @sybase_query($sql, $this->_connectionID);
                // Instantiate an object without considering whether
                // the query return any results or not
                $this->_tempResultObj = new Recordset($this->_queryID);
                $this->_insertQuery($this->_queryID);
                return $this->_tempResultObj;
        }

        /*      Returns: the last error message from previous database operation
                Note: This function is NOT available for Sybase.        */      

        function errorMsg() {
                $this->_errorMsg = "errorMsg() is not available for Sybase";
            return $this->_errorMsg;
        }

        /*      Returns: true on success, false on failure
                Close the database connection.  */      
                
        function close() {
                if ($this->_queryIDList && sizeof($this->_queryIDList > 0)) {
                        while(list($_key, $_resultID) = each($this->_queryIDList)) {
                                @sybase_free_result($_resultID);
                        }
                }
                // If its not a persistent connection, then 
                // only the connection needs to be closed
                if ($this->_isPersistentConnection != true) {   
                        return @sybase_close($this->_connectionID);
                }
                else {
                        return true;
                }
        }
        
        // A PRIVATE function used by the constructor function
        // of the query object.  insert the successful returned 
        // query id to the query id list.  Used for later results 
        // cleanup.  A private function that's never meant 
        // to be used directly
        function _insertQuery($query_id) {
                $this->_queryIDList[] = $query_id;
        }               
}
        
//----------------------------------
         Class Name: Recordset
//----------------------------------
class Recordset 
{
        /*      public variables        */
        var $fields;
        // indicates that the current record position is 
        // before the first record in a Recordset object
        var $BOF = null;        
        // indicates that the current record position 
        // is after the last record in a Recordset object
        var $EOF = null;
        
        // Private variables - starts with underscore
        var $_numOfRows = -1; // NEVER change the value! READ-ONLY!
        var $_numOfFields = -1; // NEVER change the value! READ-ONLY!
        // Holds anything that was returned from 
        // the database specific functions
        var $_tempResult = '';  
        // This variable keeps the result link identifier
        var $_queryID = -1;     
        // This variable keeps the current row in the Recordset
        var $_currentRow = -1;  

        // Returns: query id on success and false if 
        // failed Constructor function
        function Recordset($queryID) {
                $this->_queryID = $queryID;
                if ($queryID) {
                        $this->_numOfRows = @sybase_num_rows($this->_queryID);
                        $this->_numOfFields = @sybase_num_fields($this->_queryID);
                }
                else {
                        $this->_numOfRows = 0;
                        $this->_numOfFields = 0;
                }
                /*      If result set contains rows     */
                if ($this->_numOfRows > 0 && $this->_currentRow == -1) {
                        $this->_currentRow = 0;
                        $this->fields = @sybase_fetch_array($this->_queryID);
                        $this->EOF = false;
                        $this->BOF = false;
                }
                return $this->_queryID;
        }
                
        // Returns: true if successful, false if fail Set 
        // the Recordset pointer to a specified field offset. 
        // If the next call to fetchField() won't include a 
        // field offset, this field would be returned
        function fieldSeek($fieldOffset = -1) {
                $this->_tempResult = @sybase_field_seek($this->_queryID, $fieldOffset);
                return $this->_tempResult;
        }

        // Returns: an object containing field information.  
        // Get column information in the Recordset object. 
        // fetchField() can be used in order to obtain information
        // about fields in a certain query result. If the field 
        // offset isn't specified, the next field that wasn't yet
        // retrieved by fetchField() is retrieved
        function fetchField($fieldOffset = -1) {
                if ($fieldOffset != -1) {
                        $this->_tempResult = @sybase_fetch_field($this->_queryID, $fieldOffset);
                }
                /*      The $fieldOffset argument is not provided thus its -1   */
                else if ($fieldOffset == -1) {  
                        $this->_tempResult = @sybase_fetch_field($this->_queryID);
                }
                return $this->_tempResult;
        }

        // Returns: true if there still rows available, or 
        // false if there are no more rows.  Moves to the next
        // row in a specified Recordset object and makes that record 
        // the current row and the data corresponding to the row will
        // be retrieved into the fields collection.  Note: Unlike 
        // the moveRow() method, when _currentRow is getNumOfRows() - 1,
        // EOF will immediately be true.  If row number is not 
        // provided, the function will point to the 
        // first row automatically
        function nextRow() {
                if ($this->getNumOfRows() > 0) {                        
                        $this->fields = array();
                        $this->_currentRow++;
                        $this->fields = @sybase_fetch_array($this->_queryID);
                        /*      This is not working.  True all the time */
                        if ($this->fields) {
                                $this->_checkAndChangeEOF($this->_currentRow - 1);
                                return true;
                        }
                }
                $this->EOF = true;
                return false;
        }       
                        
        // Returns: true on success, false on failure moveRow()
        // moves the internal row pointer of the Recordset object 
        // to point to the specified row number and the data 
        // corresponding to the row will be retrieved into the
        // fields collection.  If row number is not provided, the
        // function will point to the first row automatically
        function moveRow($rowNumber = 0) {
                if ($rowNumber == 0) {
                        return $this->firstRow();
                }
                else if ($rowNumber == ($this->getNumOfRows() - 1)) {
                        return $this->lastRow();
                }
                if ($this->getNumOfRows() > 0 && $rowNumber < $this->getNumOfRows()) {       
                        $this->fields = null;
                        $this->_currentRow = $rowNumber;
                        if(@sybase_data_seek($this->_queryID, $this->_currentRow)) {
                                $this->fields = @sybase_fetch_array($this->_queryID);
                                /*      This is not working.  True all the time */
                                if ($this->fields) {    
                                        // No need to call _checkAndChangeEOF() 
                                        // because the possibility of moving to the 
                                        // last row has been handled by the above code
                                        $this->EOF = false; 
                                        return true;
                                }
                        }
                }
                $this->EOF = true;
                return false;
        }

        // Returns: true on success, false on failure firstRow()
        // moves the internal row pointer of the Recordset object
        // to the first row and the data corresponding to the row 
        // will be retrieved into the fields collection
        function firstRow() {
                if ($this->getNumOfRows() > 0) {
                        $this->fields = array();
                        $this->_currentRow = 0;
                        if (@sybase_data_seek($this->_queryID, $this->_currentRow)) {
                                $this->fields = @sybase_fetch_array($this->_queryID);
                                $this->EOF = false;
                                /*      This is not working.  True all the time */
                                if ($this->fields) {
                                        return true;    
                                }
                        }
                }
                $this->EOF = true;
                return false;           
        }

        // Returns: true on success, false on failure lastRow() 
        // moves the internal row pointer of the Recordset object
        // to the last row and the data corresponding to the row
        // will be retrieved into the fields collection
        function lastRow() {
                if ($this->getNumOfRows() > 0) {        
                        $this->fields = array();        
                        $num_of_rows = $this->getNumOfRows();
                        $this->_tempResult = @sybase_data_seek($this->_queryID, --$num_of_rows);
                        if ($this->_tempResult) {
                                /*      $num_of_rows decemented at above        */
                                $this->_currentRow = $num_of_rows;
                                $this->fields = @sybase_fetch_array($this->_queryID);
                                /*      This is not working.  True all the time */
                                if ($this->fields) {
                                        /*      Special case for making EOF false.      */
                                        $this->EOF = false;
                                        return true;
                                }
                        }
                }
                $this->EOF = true;
                return false;
        }

        // close() only needs to be called if you are worried
        // about using too much memory while your script is 
        // running. All associated result memory for the 
        // specified result identifier will automatically be freed
        function close() {
                $this->_tempResult = @sybase_free_result($this->_queryID);              
                return $this->_tempResult;
        }

        /*      Returns: the number of rows in a result set. 
        Get number of rows in result.   */
        
        function getNumOfRows() {
                return $this->_numOfRows;
        }

        /*      Returns: the number of fields in a result set. 
        Get number of fields in result. */
                
        function getNumOfFields() {
                return $this->_numOfFields;
        }       

        /*      Check and change the status of EOF.     */              
        function _checkAndChangeEOF($currentRow) {
                if ($currentRow >= ($this->_numOfRows - 1)) {
                        $this->EOF = true;
                }               
                else {
                        $this->EOF = false;             
                }
        }
}
?>


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