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Submitted by: Joe Thong [email protected] 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-postgresql.lib
<?php
/*
Name: phpDB PostgreSQL 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 = ''; // used 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 = "postgresql")
{
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 = "")
{
$connString = "";
$hostPieces = array();
/* Must specify the database argument */
if (!$argDatabaseName) {
return false;
}
if ($argHostname != "") {
$this->hostname = $argHostname;
}
if ($argUsername != "") {
$this->username = $argUsername;
}
if ($argPassword != "") {
$this->password = $argPassword;
}
if ($argDatabaseName != "") {
$this->databaseName = $argDatabaseName;
}
$hostPieces = split(":", $this->hostname);
if ($hostPieces[0]) {
$connString .= "host=$hostPieces[0]";
if (isset($hostPieces[1])) {
$connString .= " port=$hostPieces[1]";
}
}
if ($this->username) {
$connString .= " user=$this->username";
}
if ($this->password) {
$connString .= " password=$this->password";
}
$connString .= " dbname=$this->databaseName";
$this->_connectionID = @pg_Connect($connString);
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 = "")
{
$connString = "";
$hostPieces = array();
/* Must specify the database argument */
if (!$argDatabaseName) {
return false;
}
if ($argHostname != "") {
$this->hostname = $argHostname;
}
if ($argUsername != "") {
$this->username = $argUsername;
}
if ($argPassword != "") {
$this->password = $argPassword;
}
if ($argDatabaseName != "") {
$this->databaseName = $argDatabaseName;
}
$hostPieces = split(":", $this->hostname);
if ($hostPieces[0]) {
$connString .= "host=$hostPieces[0]";
if (isset($hostPieces[1])) {
$connString .= " port=$hostPieces[1]";
}
}
if ($this->username) {
$connString .= " user=$this->username";
}
if ($this->password) {
$connString .= " password=$this->password";
}
$connString .= " dbname=$this->databaseName";
$this->_connectionID = @pg_pConnect($connString);
if ($this->_connectionID) {
$this->_isPersistentConnection = true;
}
return $this->_connectionID;
}
// Returns: true on success, false on error Select
// the database name to be used PostgreSQL
// Note: function Not available
function selectDB($dbName) {
return false;
}
// Returns: the Recordset object disregard success
// or failure Send the sql statement to the database server
function execute($sql = "") {
// Instantiate an object without considering whether
// the query return any results or not
$this->_queryID = @pg_Exec($this->_connectionID, $sql);
$this->_tempResultObj = new Recordset($this->_queryID);
$this->_insertQuery($this->_queryID);
return $this->_tempResultObj;
}
// Returns: the last error message from previous
// database operation
function errorMsg() {
$this->_errorMsg = @pg_errormessage($this->_connectionID);
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)) {
@pg_freeresult($_resultID);
}
}
// If its not a persistent connection, then
// only the connection needs to be closed
if ($this->_isPersistentConnection != true) {
return @pg_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 */
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) {
$this->_numOfRows = @pg_numrows($this->_queryID);
/* pg_numrows() returns -1 on error */
if ($this->_numOfRows == -1) {
$this->_numOfRows = 0;
}
$this->_numOfFields = @pg_numfields($this->_queryID);
/* pg_numfields() returns -1 on error */
if ($this->_numOfFields == -1) {
$this->_numOfFields = 0;
}
}
else {
$this->_numOfRows = 0;
$this->_numOfFields = 0;
}
/* If result set contains rows */
if ($this->_numOfRows > 0 && $this->_currentRow == -1) {
$this->_currentRow = 0;
$this->fields = @pg_fetch_array($this->_queryID, $this->_currentRow);
$this->EOF = false;
$this->BOF = false;
}
return $this->_queryID;
}
// Returns: true if successful, false if fail Set the Recordset
// pointer to a specified field offset. If the next call to
// fetchField() won't include a field offset, this field would
// be returned. PostgreSQL Note: function Not available
function fieldSeek($fieldOffset = -1) {
$this->_tempResult = false;
return $this->_tempResult;
}
// Returns: an object containing field information. Get column
// information in the Recordset object. fetchField() can be used
// in order to obtain information about fields in a certain query
// result. If the field offset isn't specified, the next field
// that wasn't yet retrieved by fetchField() is retrieved.
// PostgreSQL Note: function Not available
function fetchField($fieldOffset = -1) {
$this->_tempResult = false;
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++;
$this->fields = @pg_fetch_array($this->_queryID, $this->_currentRow);
/* This is not working. True all the time */
if ($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;
$this->fields = @pg_fetch_array($this->_queryID, $this->_currentRow);
/* This is not working. True all the time */
if ($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;
$this->fields = @pg_fetch_array($this->_queryID, $this->_currentRow);
$this->EOF = true;
/* This is not working. True all the time */
if ($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();
/* $num_of_rows decemented at above */
$this->_currentRow = --$num_of_rows;
$this->fields = @pg_fetch_array($this->_queryID, $this->_currentRow);
/* This is not working. True all the time */
if ($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() {
$this->_tempResult = @pg_freeresult($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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