tms/libraries/mysql.class.php

<?php
/**
 * Ultimate MySQL Wrapper Class
 *
 * @version 2.5
 * @author Jeff L. Williams
 * @link http://www.phpclasses.org/ultimatemysql
 *
 * Contributions from
 *   Frank P. Walentynowicz
 *   Larry Wakeman
 *   Nicola Abbiuso
 *   Douglas Gintz
 *   Emre Erkan
 */
class MySQL
{
	// SET THESE VALUES TO MATCH YOUR DATA CONNECTION
	private $db_host    = "localhost";  // server name
	private $db_user    = "";       // user name
	private $db_pass    = "";           // password
	private $db_dbname  = "";           // database name
	private $db_charset = "";           // optional character set (i.e. utf8)
	private $db_pcon    = false;        // use persistent connection?

	// constants for SQLValue function
	const SQLVALUE_BIT      = "bit";
	const SQLVALUE_BOOLEAN  = "boolean";
	const SQLVALUE_DATE     = "date";
	const SQLVALUE_DATETIME = "datetime";
	const SQLVALUE_NUMBER   = "number";
	const SQLVALUE_T_F      = "t-f";
	const SQLVALUE_TEXT     = "text";
	const SQLVALUE_TIME     = "time";
	const SQLVALUE_Y_N      = "y-n";

	// class-internal variables - do not change
	private $active_row     = -1;       // current row
	private $error_desc     = "";       // last mysql error string
	private $error_number   = 0;        // last mysql error number
	private $in_transaction = false;    // used for transactions
	private $last_insert_id;            // last id of record inserted
	private $last_result;               // last mysql query result
	private $last_sql       = "";       // last mysql query
	private $mysql_link     = 0;        // mysql link resource
	private $time_diff      = 0;        // holds the difference in time
	private $time_start     = 0;        // start time for the timer

	/**
	 * Determines if an error throws an exception
	 *
	 * @var boolean Set to true to throw error exceptions
	 */
	public $ThrowExceptions = false;

	/**
	 * Constructor: Opens the connection to the database
	 *
	 * @param boolean $connect (Optional) Auto-connect when object is created
	 * @param string $database (Optional) Database name
	 * @param string $server   (Optional) Host address
	 * @param string $username (Optional) User name
	 * @param string $password (Optional) Password
	 * @param string $charset  (Optional) Character set
	 */
	public function __construct($connect = true, $database = null, $server = null,
								$username = null, $password = null, $charset = null) {

		if ($database !== null) $this->db_dbname  = $database;
		if ($server   !== null) $this->db_host    = $server;
		if ($username !== null) $this->db_user    = $username;
		if ($password !== null) $this->db_pass    = $password;
		if ($charset  !== null) $this->db_charset = $charset;

		if (strlen($this->db_host) > 0 &&
			strlen($this->db_user) > 0) {
			if ($connect) $this->Open();
		}
	}

	/**
	 * Destructor: Closes the connection to the database
	 *
	 */
	public function __destruct() {
		$this->Close();
	}

	/**
	 * Automatically does an INSERT or UPDATE depending if an existing record
	 * exists in a table
	 *
	 * @param string $tableName The name of the table
	 * @param array $valuesArray An associative array containing the column
	 *                            names as keys and values as data. The values
	 *                            must be SQL ready (i.e. quotes around
	 *                            strings, formatted dates, ect)
	 * @param array $whereArray An associative array containing the column
	 *                           names as keys and values as data. The values
	 *                           must be SQL ready (i.e. quotes around strings,
	 *                           formatted dates, ect).
	 * @return boolean Returns TRUE on success or FALSE on error
	 */
	public function AutoInsertUpdate($tableName, $valuesArray, $whereArray) {
		$this->ResetError();
		$this->SelectRows($tableName, $whereArray);
		if (! $this->Error()) {
			if ($this->HasRecords()) {
				return $this->UpdateRows($tableName, $valuesArray, $whereArray);
			} else {
				return $this->InsertRow($tableName, $valuesArray);
			}
		} else {
			return false;
		}
	}

	/**
	 * Returns true if the internal pointer is at the beginning of the records
	 *
	 * @return boolean TRUE if at the first row or FALSE if not
	 */
	public function BeginningOfSeek() {
		$this->ResetError();
		if ($this->IsConnected()) {
			if ($this->active_row < 1) {
				return true;
			} else {
				return false;
			}
		} else {
			$this->SetError("No connection");
			return false;
		}
	}

	/**
	 * [STATIC] Builds a comma delimited list of columns for use with SQL
	 *
	 * @param array $valuesArray An array containing the column names.
	 * @param boolean $addQuotes (Optional) TRUE to add quotes
	 * @param boolean $showAlias (Optional) TRUE to show column alias
	 * @return string Returns the SQL column list
	 */
	static private function BuildSQLColumns($columns, $addQuotes = true, $showAlias = true) {
		if ($addQuotes) {
			$quote = "`";
		} else {
			$quote = "";
		}
		switch (gettype($columns)) {
			case "array":
				$sql = "";
				foreach ($columns as $key => $value) {
					// Build the columns
					if (strlen($sql) == 0) {
						$sql = $quote . $value . $quote;
					} else {
						$sql .= ", " . $quote . $value . $quote;
					}
					if ($showAlias && is_string($key) && (! empty($key))) {
						$sql .= ' AS "' . $key . '"';
					}
				}
				return $sql;
				break;
			case "string":
				return $quote . $columns . $quote;
				break;
			default:
				return false;
				break;
		}
	}

	/**
	 * [STATIC] Builds a SQL DELETE statement
	 *
	 * @param string $tableName The name of the table
	 * @param array $whereArray (Optional) An associative array containing the
	 *                           column names as keys and values as data. The
	 *                           values must be SQL ready (i.e. quotes around
	 *                           strings, formatted dates, ect). If not specified
	 *                           then all values in the table are deleted.
	 * @return string Returns the SQL DELETE statement
	 */
	static public function BuildSQLDelete($tableName, $whereArray = null) {
		$sql = "DELETE FROM `" . $tableName . "`";
		if (! is_null($whereArray)) {
			$sql .= self::BuildSQLWhereClause($whereArray);
		}
		return $sql;
	}

	/**
	 * [STATIC] Builds a SQL INSERT statement
	 *
	 * @param string $tableName The name of the table
	 * @param array $valuesArray An associative array containing the column
	 *                            names as keys and values as data. The values
	 *                            must be SQL ready (i.e. quotes around
	 *                            strings, formatted dates, ect)
	 * @return string Returns a SQL INSERT statement
	 */
	static public function BuildSQLInsert($tableName, $valuesArray) {
		$columns = self::BuildSQLColumns(array_keys($valuesArray));
		$values  = self::BuildSQLColumns($valuesArray, false, false);
		$sql = "INSERT INTO `" . $tableName .
			   "` (" . $columns . ") VALUES (" . $values . ")";
		return $sql;
	}

	/**
	 * Builds a simple SQL SELECT statement
	 *
	 * @param string $tableName The name of the table
	 * @param array $whereArray (Optional) An associative array containing the
	 *                          column names as keys and values as data. The
	 *                          values must be SQL ready (i.e. quotes around
	 *                          strings, formatted dates, ect)
	 * @param array/string $columns (Optional) The column or list of columns to select
	 * @param array/string $sortColumns (Optional) Column or list of columns to sort by
	 * @param boolean $sortAscending (Optional) TRUE for ascending; FALSE for descending
	 *                               This only works if $sortColumns are specified
	 * @param integer/string $limit (Optional) The limit of rows to return
	 * @return string Returns a SQL SELECT statement
	 */
	static public function BuildSQLSelect($tableName, $whereArray = null, $columns = null,
										  $sortColumns = null, $sortAscending = true, $limit = null) {
		if (! is_null($columns)) {
			$sql = self::BuildSQLColumns($columns);
		} else {
			$sql = "*";
		}
		$sql = "SELECT " . $sql . " FROM `" . $tableName . "`";
		if (is_array($whereArray)) {
			$sql .= self::BuildSQLWhereClause($whereArray);
		}
		if (! is_null($sortColumns)) {
			$sql .= " ORDER BY " .
					self::BuildSQLColumns($sortColumns, true, false) .
					" " . ($sortAscending ? "ASC" : "DESC");
		}
		if (! is_null($limit)) {
			$sql .= " LIMIT " . $limit;
		}
		return $sql;
	}

	/**
	 * [STATIC] Builds a SQL UPDATE statement
	 *
	 * @param string $tableName The name of the table
	 * @param array $valuesArray An associative array containing the column
	 *                            names as keys and values as data. The values
	 *                            must be SQL ready (i.e. quotes around
	 *                            strings, formatted dates, ect)
	 * @param array $whereArray (Optional) An associative array containing the
	 *                           column names as keys and values as data. The
	 *                           values must be SQL ready (i.e. quotes around
	 *                           strings, formatted dates, ect). If not specified
	 *                           then all values in the table are updated.
	 * @return string Returns a SQL UPDATE statement
	 */
	static public function BuildSQLUpdate($tableName, $valuesArray, $whereArray = null) {
		$sql = "";
		foreach ($valuesArray as $key => $value) {
			if (strlen($sql) == 0) {
				$sql = "`" . $key . "` = " . $value;
			} else {
				$sql .= ", `" . $key . "` = " . $value;
			}
		}
		$sql = "UPDATE `" . $tableName . "` SET " . $sql;
		if (is_array($whereArray)) {
			$sql .= self::BuildSQLWhereClause($whereArray);
		}
		return $sql;
	}

	/**
	 * [STATIC] Builds a SQL WHERE clause from an array.
	 * If a key is specified, the key is used at the field name and the value
	 * as a comparison. If a key is not used, the value is used as the clause.
	 *
	 * @param array $whereArray An associative array containing the column
	 *                           names as keys and values as data. The values
	 *                           must be SQL ready (i.e. quotes around
	 *                           strings, formatted dates, ect)
	 * @return string Returns a string containing the SQL WHERE clause
	 */
	static public function BuildSQLWhereClause($whereArray) {
		$where = "";
		foreach ($whereArray as $key => $value) {
			if (strlen($where) == 0) {
				if (is_string($key)) {
					$where = " WHERE `" . $key . "` = " . $value;
				} else {
					$where = " WHERE " . $value;
				}
			} else {
				if (is_string($key)) {
					$where .= " AND `" . $key . "` = " . $value;
				} else {
					$where .= " AND " . $value;
				}
			}
		}
		return $where;
	}

	/**
	 * Close current MySQL connection
	 *
	 * @return object Returns TRUE on success or FALSE on error
	 */
	public function Close() {
		$this->ResetError();
		$this->active_row = -1;
		$success = $this->Release();
		if ($success) {
			$success = @mysql_close($this->mysql_link);
			if (! $success) {
				$this->SetError();
			} else {
				unset($this->last_sql);
				unset($this->last_result);
				unset($this->mysql_link);
			}
		}
		return $success;
	}

	/**
	 * Deletes rows in a table based on a WHERE filter
	 * (can be just one or many rows based on the filter)
	 *
	 * @param string $tableName The name of the table
	 * @param array $whereArray (Optional) An associative array containing the
	 *                          column names as keys and values as data. The
	 *                          values must be SQL ready (i.e. quotes around
	 *                          strings, formatted dates, ect). If not specified
	 *                          then all values in the table are deleted.
	 * @return boolean Returns TRUE on success or FALSE on error
	 */
	public function DeleteRows($tableName, $whereArray = null) {
		$this->ResetError();
		if (! $this->IsConnected()) {
			$this->SetError("No connection");
			return false;
		} else {
			$sql = self::BuildSQLDelete($tableName, $whereArray);
			// Execute the UPDATE
			if (! $this->Query($sql)) {
				return false;
			} else {
				return true;
			}
		}
	}

	/**
	 * Returns true if the internal pointer is at the end of the records
	 *
	 * @return boolean TRUE if at the last row or FALSE if not
	 */
	public function EndOfSeek() {
		$this->ResetError();
		if ($this->IsConnected()) {
			if ($this->active_row >= ($this->RowCount())) {
				return true;
			} else {
				return false;
			}
		} else {
			$this->SetError("No connection");
			return false;
		}
	}

	/**
	 * Returns the last MySQL error as text
	 *
	 * @return string Error text from last known error
	 */
	public function Error() {
		$error = $this->error_desc;
		if (empty($error)) {
			if ($this->error_number <> 0) {
				$error = "Unknown Error (#" . $this->error_number . ")";
			} else {
				$error = false;
			}
		} else {
			if ($this->error_number > 0) {
				$error .= " (#" . $this->error_number . ")";
			}
		}
		return $error;
	}

	/**
	 * Returns the last MySQL error as a number
	 *
	 * @return integer Error number from last known error
	 */
	public function ErrorNumber() {
		if (strlen($this->error_desc) > 0)
		{
			if ($this->error_number <> 0)
			{
				return $this->error_number;
			} else {
				return -1;
			}
		} else {
			return $this->error_number;
		}
	}

	/**
	 * [STATIC] Converts any value of any datatype into boolean (true or false)
	 *
	 * @param mixed $value Value to analyze for TRUE or FALSE
	 * @return boolean Returns TRUE or FALSE
	 */
	static public function GetBooleanValue($value) {
		if (gettype($value) == "boolean") {
			if ($value == true) {
				return true;
			} else {
				return false;
			}
		} elseif (is_numeric($value)) {
			if ($value > 0) {
				return true;
			} else {
				return false;
			}
		} else {
			$cleaned = strtoupper(trim($value));

			if ($cleaned == "ON") {
				return true;
			} elseif ($cleaned == "SELECTED" || $cleaned == "CHECKED") {
				return true;
			} elseif ($cleaned == "YES" || $cleaned == "Y") {
				return true;
			} elseif ($cleaned == "TRUE" || $cleaned == "T") {
				return true;
			} else {
				return false;
			}
		}
	}

	/**
	 * Returns the comments for fields in a table into an
	 * array or NULL if the table has not got any fields
	 *
	 * @param string $table Table name
	 * @return array An array that contains the column comments
	 */
	public function GetColumnComments($table) {
		$this->ResetError();
		$records = mysql_query("SHOW FULL COLUMNS FROM " . $table);
		if (! $records) {
			$this->SetError();
			return false;
		} else {
			// Get the column names
			$columnNames = $this->GetColumnNames($table);
			if ($this->Error()) {
				return false;
			} else {
				$index = 0;
				// Fetchs the array to be returned (column 8 is field comment):
				while ($array_data = mysql_fetch_array($records)) {
					$columns[$index] = $array_data[8];
					$columns[$columnNames[$index++]] = $array_data[8];
				}
				return $columns;
			}
		}
	}

	/**
	 * This function returns the number of columns or returns FALSE on error
	 *
	 * @param string $table (Optional) If a table name is not specified, the
	 *                      column count is returned from the last query
	 * @return integer The total count of columns
	 */
	public function GetColumnCount($table = "") {
		$this->ResetError();
		if (empty($table)) {
			$result = mysql_num_fields($this->last_result);
			if (! $result) $this->SetError();
		} else {
			$records = mysql_query("SELECT * FROM " . $table . " LIMIT 1");
			if (! $records) {
				$this->SetError();
				$result = false;
			} else {
				$result = mysql_num_fields($records);
				$success = @mysql_free_result($records);
				if (! $success) {
					$this->SetError();
					$result = false;
				}
			}
		}
		return $result;
	}

	/**
	 * This function returns the data type for a specified column. If
	 * the column does not exists or no records exist, it returns FALSE
	 *
	 * @param string $column Column name or number (first column is 0)
	 * @param string $table (Optional) If a table name is not specified, the
	 *                      last returned records are used
	 * @return string MySQL data (field) type
	 */
	public function GetColumnDataType($column, $table = "") {
		$this->ResetError();
		if (empty($table)) {
			if ($this->RowCount() > 0) {
				if (is_numeric($column)) {
					return mysql_field_type($this->last_result, $column);
				} else {
					return mysql_field_type($this->last_result, $this->GetColumnID($column));
				}
			} else {
				return false;
			}
		} else {
			if (is_numeric($column)) $column = $this->GetColumnName($column, $table);
			$result = mysql_query("SELECT " . $column . " FROM " . $table . " LIMIT 1");
			if (mysql_num_fields($result) > 0) {
				return mysql_field_type($result, 0);
			} else {
				$this->SetError("The specified column or table does not exist, or no data was returned", -1);
				return false;
			}
		}
	}

	/**
	 * This function returns the position of a column
	 *
	 * @param string $column Column name
	 * @param string $table (Optional) If a table name is not specified, the
	 *                      last returned records are used.
	 * @return integer Column ID
	 */
	public function GetColumnID($column, $table = "") {
		$this->ResetError();
		$columnNames = $this->GetColumnNames($table);
		if (! $columnNames) {
			return false;
		} else {
			$index = 0;
			$found = false;
			foreach ($columnNames as $columnName) {
				if ($columnName == $column) {
					$found = true;
					break;
				}
				$index++;
			}
			if ($found) {
				return $index;
			} else {
				$this->SetError("Column name not found", -1);
				return false;
			}
		}
	}

   /**
	 * This function returns the field length or returns FALSE on error
	 *
	 * @param string $column Column name
	 * @param string $table (Optional) If a table name is not specified, the
	 *                      last returned records are used.
	 * @return integer Field length
	 */
	public function GetColumnLength($column, $table = "") {
		$this->ResetError();
		if (empty($table)) {
			if (is_numeric($column)) {
				$columnID = $column;
			} else {
				$columnID = $this->GetColumnID($column);
			}
			if (! $columnID) {
				return false;
			} else {
				$result = mysql_field_len($this->last_result, $columnID);
				if (! $result) {
					$this->SetError();
					return false;
				} else {
					return $result;
				}
			}
		} else {
			$records = mysql_query("SELECT " . $column . " FROM " . $table . " LIMIT 1");
			if (! $records) {
				$this->SetError();
				return false;
			}
			$result = mysql_field_len($records, 0);
			if (! $result) {
				$this->SetError();
				return false;
			} else {
				return $result;
			}
		}
	}

   /**
	 * This function returns the name for a specified column number. If
	 * the index does not exists or no records exist, it returns FALSE
	 *
	 * @param string $columnID Column position (0 is the first column)
	 * @param string $table (Optional) If a table name is not specified, the
	 *                      last returned records are used.
	 * @return integer Field Length
	 */
	public function GetColumnName($columnID, $table = "") {
		$this->ResetError();
		if (empty($table)) {
			if ($this->RowCount() > 0) {
				$result = mysql_field_name($this->last_result, $columnID);
				if (! $result) $this->SetError();
			} else {
				$result = false;
			}
		} else {
			$records = mysql_query("SELECT * FROM " . $table . " LIMIT 1");
			if (! $records) {
				$this->SetError();
				$result = false;
			} else {
				if (mysql_num_fields($records) > 0) {
					$result = mysql_field_name($records, $columnID);
					if (! $result) $this->SetError();
				} else {
					$result = false;
				}
			}
		}
		return $result;
	}

	/**
	 * Returns the field names in a table or query in an array
	 *
	 * @param string $table (Optional) If a table name is not specified, the
	 *                      last returned records are used
	 * @return array An array that contains the column names
	 */
	public function GetColumnNames($table = "") {
		$this->ResetError();
		if (empty($table)) {
			$columnCount = mysql_num_fields($this->last_result);
			if (! $columnCount) {
				$this->SetError();
				$columns = false;
			} else {
				for ($column = 0; $column < $columnCount; $column++) {
					$columns[] = mysql_field_name($this->last_result, $column);
				}
			}
		} else {
			$result = mysql_query("SHOW COLUMNS FROM " . $table);
			if (! $result) {
				$this->SetError();
				$columns = false;
			} else {
				while ($array_data = mysql_fetch_array($result)) {
					$columns[] = $array_data[0];
				}
			}
		}

		// Returns the array
		return $columns;
	}

	/**
	 * This function returns the last query as an HTML table
	 *
	 * @param boolean $showCount (Optional) TRUE if you want to show the row count,
	 *                           FALSE if you do not want to show the count
	 * @param string $styleTable (Optional) Style information for the table
	 * @param string $styleHeader (Optional) Style information for the header row
	 * @param string $styleData (Optional) Style information for the cells
	 * @return string HTML containing a table with all records listed
	 */
	public function GetHTML($showCount = true, $styleTable = null, $styleHeader = null, $styleData = null) {
		if ($styleTable === null) {
			$tb = "border-collapse:collapse;empty-cells:show";
		} else {
			$tb = $styleTable;
		}
		if ($styleHeader === null) {
			$th = "border-width:1px;border-style:solid;background-color:navy;color:white";
		} else {
			$th = $styleHeader;
		}
		if ($styleData === null) {
			$td = "border-width:1px;border-style:solid";
		} else {
			$td = $styleData;
		}

		if ($this->last_result) {
			if ($this->RowCount() > 0) {
				$html = "";
				if ($showCount) $html = "Record Count: " . $this->RowCount() . "<br />\n";
				$html .= "<table style=\"$tb\" cellpadding=\"2\" cellspacing=\"2\">\n";
				$this->MoveFirst();
				$header = false;
				while ($member = mysql_fetch_object($this->last_result)) {
					if (!$header) {
						$html .= "\t<tr>\n";
						foreach ($member as $key => $value) {
							$html .= "\t\t<td style=\"$th\"><strong>" . htmlspecialchars($key) . "</strong></td>\n";
						}
						$html .= "\t</tr>\n";
						$header = true;
					}
					$html .= "\t<tr>\n";
					foreach ($member as $key => $value) {
						$html .= "\t\t<td style=\"$td\">" . htmlspecialchars($value) . "</td>\n";
					}
					$html .= "\t</tr>\n";
				}
				$this->MoveFirst();
				$html .= "</table>";
			} else {
				$html = "No records were returned.";
			}
		} else {
			$this->active_row = -1;
			$html = false;
		}
		return $html;
	}

	/**
	* Returns the last query as a JSON document
	*
	* @return string JSON containing all records listed
	*/
	public function GetJSON() {
		if ($this->last_result) {
			if ($this->RowCount() > 0) {
				for ($i = 0, $il = mysql_num_fields($this->last_result); $i < $il; $i++) {
					$types[$i] = mysql_field_type($this->last_result, $i);
				}
				$json = '[';
				$this->MoveFirst();
				while ($member = mysql_fetch_object($this->last_result)) {
					$json .= json_encode($member) . ",";
				}
				$json .= ']';
				$json = str_replace("},]", "}]", $json);
			} else {
				$json = 'null';
			}
		} else {
			$this->active_row = -1;
			$json = 'null';
		}
		return $json;
	}

	/**
	 * Returns the last autonumber ID field from a previous INSERT query
	 *
	 * @return  integer ID number from previous INSERT query
	 */
	public function GetLastInsertID() {
		return $this->last_insert_id;
	}

	/**
	 * Returns the last SQL statement executed
	 *
	 * @return string Current SQL query string
	 */
	public function GetLastSQL() {
		return $this->last_sql;
	}

	/**
	 * This function returns table names from the database
	 * into an array. If the database does not contains
	 * any tables, the returned value is FALSE
	 *
	 * @return array An array that contains the table names
	 */
	public function GetTables() {
		$this->ResetError();
		// Query to get the tables in the current database:
		$records = mysql_query("SHOW TABLES");
		if (! $records) {
			$this->SetError();
			return FALSE;
		} else {
			while ($array_data = mysql_fetch_array($records)) {
				$tables[] = $array_data[0];
			}

			// Returns the array or NULL
			if (count($tables) > 0) {
				return $tables;
			} else {
				return FALSE;
			}
		}
	}

	/**
	 * Returns the last query as an XML Document
	 *
	 * @return string XML containing all records listed
	 */
	public function GetXML() {
		// Create a new XML document
		$doc = new DomDocument('1.0'); // ,'UTF-8');

		// Create the root node
		$root = $doc->createElement('root');
		$root = $doc->appendChild($root);

		// If there was a result set
		if (is_resource($this->last_result)) {

			// Show the row count and query
			$root->setAttribute('rows',
				($this->RowCount() ? $this->RowCount() : 0));
			$root->setAttribute('query', $this->last_sql);
			$root->setAttribute('error', "");

			// process one row at a time
			$rowCount = 0;
			while ($row = mysql_fetch_assoc($this->last_result)) {

				// Keep the row count
				$rowCount = $rowCount + 1;

				// Add node for each row
				$element = $doc->createElement('row');
				$element = $root->appendChild($element);
				$element->setAttribute('index', $rowCount);

				// Add a child node for each field
				foreach ($row as $fieldname => $fieldvalue) {
					$child = $doc->createElement($fieldname);
					$child = $element->appendChild($child);

					// $fieldvalue = iconv("ISO-8859-1", "UTF-8", $fieldvalue);
					$fieldvalue = htmlspecialchars($fieldvalue);
					$value = $doc->createTextNode($fieldvalue);
					$value = $child->appendChild($value);
				} // foreach
			} // while
		} else {
			// Process any errors
			$root->setAttribute('rows', 0);
			$root->setAttribute('query', $this->last_sql);
			if ($this->Error()) {
				$root->setAttribute('error', $this->Error());
			} else {
				$root->setAttribute('error', "No query has been executed.");
			}
		}

		// Show the XML document
		return $doc->saveXML();
	}

	/**
	 * Determines if a query contains any rows
	 *
	 * @param string $sql [Optional] If specified, the query is first executed
	 *                    Otherwise, the last query is used for comparison
	 * @return boolean TRUE if records exist, FALSE if not or query error
	 */
	public function HasRecords($sql = "") {
		if (strlen($sql) > 0) {
			$this->Query($sql);
			if ($this->Error()) return false;
		}
		if ($this->RowCount() > 0) {
			return true;
		} else {
			return false;
		}
	}

	/**
	 * Inserts a row into a table in the connected database
	 *
	 * @param string $tableName The name of the table
	 * @param array $valuesArray An associative array containing the column
	 *                            names as keys and values as data. The values
	 *                            must be SQL ready (i.e. quotes around
	 *                            strings, formatted dates, ect)
	 * @return integer Returns last insert ID on success or FALSE on failure
	 */
	public function InsertRow($tableName, $valuesArray) {
		$this->ResetError();
		if (! $this->IsConnected()) {
			$this->SetError("No connection");
			return false;
		} else {
			// Execute the query
			$sql = self::BuildSQLInsert($tableName, $valuesArray);
			if (! $this->Query($sql)) {
				return false;
			} else {
				return $this->GetLastInsertID();
			}
		}
	}

	/**
	 * Determines if a valid connection to the database exists
	 *
	 * @return boolean TRUE idf connectect or FALSE if not connected
	 */
	public function IsConnected() {
		if (gettype($this->mysql_link) == "resource") {
			return true;
		} else {
			return false;
		}
	}

	/**
	 * [STATIC] Determines if a value of any data type is a date PHP can convert
	 *
	 * @param date/string $value
	 * @return boolean Returns TRUE if value is date or FALSE if not date
	 */
	static public function IsDate($value) {
		$date = date('Y', strtotime($value));
		if ($date == "1969" || $date == '') {
			return false;
		} else {
			return true;
		}
	}

	/**
	 * Stop executing (die/exit) and show last MySQL error message
	 *
	 */
	public function Kill($message = "") {
		if (strlen($message) > 0) {
			exit($message);
		} else {
			exit($this->Error());
		}
	}

	/**
	 * Seeks to the beginning of the records
	 *
	 * @return boolean Returns TRUE on success or FALSE on error
	 */
	public function MoveFirst() {
		$this->ResetError();
		if (! $this->Seek(0)) {
			$this->SetError();
			return false;
		} else {
			$this->active_row = 0;
			return true;
		}
	}

	/**
	 * Seeks to the end of the records
	 *
	 * @return boolean Returns TRUE on success or FALSE on error
	 */
	public function MoveLast() {
		$this->ResetError();
		$this->active_row = $this->RowCount() - 1;
		if (! $this->Error()) {
			if (! $this->Seek($this->active_row)) {
				return false;
			} else {
				return true;
			}
		} else {
			return false;
		}
	}

	/**
	 * Connect to specified MySQL server
	 *
	 * @param string $database (Optional) Database name
	 * @param string $server   (Optional) Host address
	 * @param string $username (Optional) User name
	 * @param string $password (Optional) Password
	 * @param string $charset  (Optional) Character set
	 * @param boolean $pcon    (Optional) Persistant connection
	 * @return boolean Returns TRUE on success or FALSE on error
	 */
	public function Open($database = null, $server = null, $username = null,
						 $password = null, $charset = null, $pcon = false) {
		$this->ResetError();

		// Use defaults?
		if ($database !== null) $this->db_dbname  = $database;
		if ($server   !== null) $this->db_host    = $server;
		if ($username !== null) $this->db_user    = $username;
		if ($password !== null) $this->db_pass    = $password;
		if ($charset  !== null) $this->db_charset = $charset;
		if (is_bool($pcon))     $this->db_pcon    = $pcon;

		$this->active_row = -1;

		// Open persistent or normal connection
		if ($pcon) {
			$this->mysql_link = @mysql_pconnect(
				$this->db_host, $this->db_user, $this->db_pass);
		} else {
			$this->mysql_link = @mysql_connect (
				$this->db_host, $this->db_user, $this->db_pass);
		}
		// Connect to mysql server failed?
		if (! $this->IsConnected()) {
			$this->SetError();
			return false;
		} else {
			// Select a database (if specified)
			if (strlen($this->db_dbname) > 0) {
				if (strlen($this->db_charset) == 0) {
					if (! $this->SelectDatabase($this->db_dbname)) {
						return false;
					} else {
						return true;
					}
				} else {
					if (! $this->SelectDatabase(
						$this->db_dbname, $this->db_charset)) {
						return false;
					} else {
						return true;
					}
				}
			} else {
				return true;
			}
		}
	}

	/**
	 * Executes the given SQL query and returns the records
	 *
	 * @param string $sql The query string should not end with a semicolon
	 * @return object PHP 'mysql result' resource object containing the records
	 *                on SELECT, SHOW, DESCRIBE or EXPLAIN queries and returns;
	 *                TRUE or FALSE for all others i.e. UPDATE, DELETE, DROP
	 *                AND FALSE on all errors (setting the local Error message)
	 */
	public function Query($sql) {
		$this->ResetError();
		$this->last_sql = $sql;
		$this->last_result = @mysql_query($sql, $this->mysql_link);
		if(! $this->last_result) {
			$this->active_row = -1;
			$this->SetError();
			return false;
		} else {
      if (strpos(strtolower($sql),"insert")===0) {
				$this->last_insert_id = mysql_insert_id();
				if ($this->last_insert_id === false) {
					$this->SetError();
					return false;
				} else {
					$numrows = 0;
					$this->active_row = -1;
					return $this->last_result;
				}
      } else if(strpos(strtolower($sql),"select")===0) {
				$numrows = mysql_num_rows($this->last_result);
				if ($numrows > 0) {
					$this->active_row = 0;
				} else {
					$this->active_row = -1;
				}
				$this->last_insert_id = 0;
				return $this->last_result;
			} else {
				return $this->last_result;
			}
		}
	}

	/**
	 * Executes the given SQL query and returns a multi-dimensional array
	 *
	 * @param string $sql The query string should not end with a semicolon
	 * @param integer $resultType (Optional) The type of array
	 *                Values can be: MYSQL_ASSOC, MYSQL_NUM, MYSQL_BOTH
	 * @return array A multi-dimensional array containing all the data
	 *               returned from the query or FALSE on all errors
	 */
	public function QueryArray($sql, $resultType = MYSQL_BOTH) {
		$this->Query($sql);
		if (! $this->Error()) {
			return $this->RecordsArray($resultType);
		} else {
			return false;
		}
	}

	/**
	 * Executes the given SQL query and returns only one (the first) row
	 *
	 * @param string $sql The query string should not end with a semicolon
	 * @return object PHP resource object containing the first row or
	 *                FALSE if no row is returned from the query
	 */
	public function QuerySingleRow($sql) {
		$this->Query($sql);
		if ($this->RowCount() > 0) {
			return $this->Row();
		} else {
			return false;
		}
	}

	/**
	 * Executes the given SQL query and returns the first row as an array
	 *
	 * @param string $sql The query string should not end with a semicolon
	 * @param integer $resultType (Optional) The type of array
	 *                Values can be: MYSQL_ASSOC, MYSQL_NUM, MYSQL_BOTH
	 * @return array An array containing the first row or FALSE if no row
	 *               is returned from the query
	 */
	public function QuerySingleRowArray($sql, $resultType = MYSQL_BOTH) {
		$this->Query($sql);
		if ($this->RowCount() > 0) {
			return $this->RowArray(null, $resultType);
		} else {
			return false;
		}
	}

	/**
	 * Executes a query and returns a single value. If more than one row
	 * is returned, only the first value in the first column is returned.
	 *
	 * @param string $sql The query string should not end with a semicolon
	 * @return mixed The value returned or FALSE if no value
	 */
	public function QuerySingleValue($sql) {
		$this->Query($sql);
		if ($this->RowCount() > 0 && $this->GetColumnCount() > 0) {
			$row = $this->RowArray(null, MYSQL_NUM);
			return $row[0];
		} else {
			return false;
		}
	}

	/**
	 * Executes the given SQL query, measures it, and saves the total duration
	 * in microseconds
	 *
	 * @param string $sql The query string should not end with a semicolon
	 * @return object PHP 'mysql result' resource object containing the records
	 *                on SELECT, SHOW, DESCRIBE or EXPLAIN queries and returns
	 *                TRUE or FALSE for all others i.e. UPDATE, DELETE, DROP
	 */
	public function QueryTimed($sql) {
		$this->TimerStart();
		$result = $this->Query($sql);
		$this->TimerStop();
		return $result;
	}

	/**
	 * Returns the records from the last query
	 *
	 * @return object PHP 'mysql result' resource object containing the records
	 *                for the last query executed
	 */
	public function Records() {
		return $this->last_result;
	}

	/**
	 * Returns all records from last query and returns contents as array
	 * or FALSE on error
	 *
	 * @param integer $resultType (Optional) The type of array
	 *                Values can be: MYSQL_ASSOC, MYSQL_NUM, MYSQL_BOTH
	 * @return Records in array form
	 */
	public function RecordsArray($resultType = MYSQL_BOTH) {
		$this->ResetError();
		if ($this->last_result) {
			if (! @mysql_data_seek($this->last_result, 0)) {
				$this->SetError();
				return false;
			} else {
				//while($member = mysql_fetch_object($this->last_result)){
				while ($member = mysql_fetch_array($this->last_result, $resultType)){
					$members[] = $member;
				}
				mysql_data_seek($this->last_result, 0);
				$this->active_row = 0;
				return $members;
			}
		} else {
			$this->active_row = -1;
			$this->SetError("No query results exist", -1);
			return false;
		}
	}

	/**
	 * Frees memory used by the query results and returns the function result
	 *
	 * @return boolean Returns TRUE on success or FALSE on failure
	 */
	public function Release() {
		$this->ResetError();
		if (! $this->last_result) {
			$success = true;
		} else {
			$success = @mysql_free_result($this->last_result);
			if (! $success) $this->SetError();
		}
		return $success;
	}

	/**
	 * Clears the internal variables from any error information
	 *
	 */
	private function ResetError() {
		$this->error_desc = '';
		$this->error_number = 0;
	}

	/**
	 * Reads the current row and returns contents as a
	 * PHP object or returns false on error
	 *
	 * @param integer $optional_row_number (Optional) Use to specify a row
	 * @return object PHP object or FALSE on error
	 */
	public function Row($optional_row_number = null) {
		$this->ResetError();
		if (! $this->last_result) {
			$this->SetError("No query results exist", -1);
			return false;
		} elseif ($optional_row_number === null) {
			if (($this->active_row) > $this->RowCount()) {
				$this->SetError("Cannot read past the end of the records", -1);
				return false;
			} else {
				$this->active_row++;
			}
		} else {
			if ($optional_row_number >= $this->RowCount()) {
				$this->SetError("Row number is greater than the total number of rows", -1);
				return false;
			} else {
				$this->active_row = $optional_row_number;
				$this->Seek($optional_row_number);
			}
		}
		$row = mysql_fetch_object($this->last_result);
		if (! $row) {
			$this->SetError();
			return false;
		} else {
			return $row;
		}
	}

	/**
	 * Reads the current row and returns contents as an
	 * array or returns false on error
	 *
	 * @param integer $optional_row_number (Optional) Use to specify a row
	 * @param integer $resultType (Optional) The type of array
	 *                Values can be: MYSQL_ASSOC, MYSQL_NUM, MYSQL_BOTH
	 * @return array Array that corresponds to fetched row or FALSE if no rows
	 */
	public function RowArray($optional_row_number = null, $resultType = MYSQL_BOTH) {
		$this->ResetError();
		if (! $this->last_result) {
			$this->SetError("No query results exist", -1);
			return false;
		} elseif ($optional_row_number === null) {
			if (($this->active_row) > $this->RowCount()) {
				$this->SetError("Cannot read past the end of the records", -1);
				return false;
			} else {
				$this->active_row++;
			}
		} else {
			if ($optional_row_number >= $this->RowCount()) {
				$this->SetError("Row number is greater than the total number of rows", -1);
				return false;
			} else {
				$this->active_row = $optional_row_number;
				$this->Seek($optional_row_number);
			}
		}
		$row = mysql_fetch_array($this->last_result, $resultType);
		if (! $row) {
			$this->SetError();
			return false;
		} else {
			return $row;
		}
	}

	/**
	 * Returns the last query row count
	 *
	 * @return integer Row count or FALSE on error
	 */
	public function RowCount() {
		$this->ResetError();
		if (! $this->IsConnected()) {
			$this->SetError("No connection", -1);
			return false;
		} elseif (! $this->last_result) {
			$this->SetError("No query results exist", -1);
			return false;
		} else {
			$result = @mysql_num_rows($this->last_result);
			if (! $result) {
				$this->SetError();
				return false;
			} else {
				return $result;
			}
		}
	}

	/**
	 * Sets the internal database pointer to the
	 * specified row number and returns the result
	 *
	 * @param integer $row_number Row number
	 * @return object Fetched row as PHP object
	 */
	public function Seek($row_number) {
		$this->ResetError();
		$row_count = $this->RowCount();
		if (! $row_count) {
			return false;
		} elseif ($row_number >= $row_count) {
			$this->SetError("Seek parameter is greater than the total number of rows", -1);
			return false;
		} else {
			$this->active_row = $row_number;
			$result = mysql_data_seek($this->last_result, $row_number);
			if (! $result) {
				$this->SetError();
				return false;
			} else {
				$record = mysql_fetch_row($this->last_result);
				if (! $record) {
					$this->SetError();
					return false;
				} else {
					// Go back to the record after grabbing it
					mysql_data_seek($this->last_result, $row_number);
					return $record;
				}
			}
		}
	}

	/**
	 * Returns the current cursor row location
	 *
	 * @return integer Current row number
	 */
	public function SeekPosition() {
		return $this->active_row;
	}

	/**
	 * Selects a different database and character set
	 *
	 * @param string $database Database name
	 * @param string $charset (Optional) Character set (i.e. utf8)
	 * @return boolean Returns TRUE on success or FALSE on error
	 */
	public function SelectDatabase($database, $charset = "") {
		$return_value = true;
		if (! $charset) $charset = $this->db_charset;
		$this->ResetError();
		if (! (mysql_select_db($database))) {
			$this->SetError();
			$return_value = false;
		} else {
			if ((strlen($charset) > 0)) {
				if (! (mysql_query("SET CHARACTER SET '{$charset}'", $this->mysql_link))) {
					$this->SetError();
					$return_value = false;
				}
			}
		}
		return $return_value;
	}

	/**
	 * Gets rows in a table based on a WHERE filter
	 *
	 * @param string $tableName The name of the table
	 * @param array $whereArray (Optional) An associative array containing the
	 *                          column names as keys and values as data. The
	 *                          values must be SQL ready (i.e. quotes around
	 *                          strings, formatted dates, ect)
	 * @param array/string $columns (Optional) The column or list of columns to select
	 * @param array/string $sortColumns (Optional) Column or list of columns to sort by
	 * @param boolean $sortAscending (Optional) TRUE for ascending; FALSE for descending
	 *                               This only works if $sortColumns are specified
	 * @param integer/string $limit (Optional) The limit of rows to return
	 * @return boolean Returns records on success or FALSE on error
	 */
	public function SelectRows($tableName, $whereArray = null, $columns = null,
							   $sortColumns = null, $sortAscending = true,
							   $limit = null) {
		$this->ResetError();
		if (! $this->IsConnected()) {
			$this->SetError("No connection");
			return false;
		} else {
			$sql = self::BuildSQLSelect($tableName, $whereArray,
					$columns, $sortColumns, $sortAscending, $limit);
			// Execute the UPDATE
			if (! $this->Query($sql)) {
				return $this->last_result;
			} else {
				return true;
			}
		}
	}

	/**
	 * Retrieves all rows in a specified table
	 *
	 * @param string $tableName The name of the table
	 * @return boolean Returns records on success or FALSE on error
	 */
	public function SelectTable($tableName) {
		return $this->SelectRows($tableName);
	}

	/**
	 * Sets the local variables with the last error information
	 *
	 * @param string $errorMessage The error description
	 * @param integer $errorNumber The error number
	 */
	private function SetError($errorMessage = "", $errorNumber = 0) {
		try {
			if (strlen($errorMessage) > 0) {
				$this->error_desc = $errorMessage;
			} else {
				if ($this->IsConnected()) {
					$this->error_desc = mysql_error($this->mysql_link);
				} else {
					$this->error_desc = mysql_error();
				}
			}
			if ($errorNumber <> 0) {
				$this->error_number = $errorNumber;
			} else {
				if ($this->IsConnected()) {
					$this->error_number = @mysql_errno($this->mysql_link);
				} else {
					$this->error_number = @mysql_errno();
				}
			}
		} catch(Exception $e) {
			$this->error_desc = $e->getMessage();
			$this->error_number = -999;
		}
		if ($this->ThrowExceptions) {
			throw new Exception($this->error_desc);
		}
	}

	/**
	 * [STATIC] Converts a boolean into a formatted TRUE or FALSE value of choice
	 *
	 * @param mixed $value value to analyze for TRUE or FALSE
	 * @param mixed $trueValue value to use if TRUE
	 * @param mixed $falseValue value to use if FALSE
	 * @param string $datatype Use SQLVALUE constants or the strings:
	 *                          string, text, varchar, char, boolean, bool,
	 *                          Y-N, T-F, bit, date, datetime, time, integer,
	 *                          int, number, double, float
	 * @return string SQL formatted value of the specified data type
	 */
	static public function SQLBooleanValue($value, $trueValue, $falseValue, $datatype = self::SQLVALUE_TEXT) {
		if (self::GetBooleanValue($value)) {
		   $return_value = self::SQLValue($trueValue, $datatype);
		} else {
		   $return_value = self::SQLValue($falseValue, $datatype);
		}
		return $return_value;
	}

	/**
	 * [STATIC] Returns string suitable for SQL
	 *
	 * @param string $value
	 * @return string SQL formatted value
	 */
	static public function SQLFix($value) {
		return @addslashes($value);
	}

	/**
	 * [STATIC] Returns MySQL string as normal string
	 *
	 * @param string $value
	 * @return string
	 */
	static public function SQLUnfix($value) {
		return @stripslashes($value);
	}

	/**
	 * [STATIC] Formats any value into a string suitable for SQL statements
	 * (NOTE: Also supports data types returned from the gettype function)
	 *
	 * @param mixed $value Any value of any type to be formatted to SQL
	 * @param string $datatype Use SQLVALUE constants or the strings:
	 *                          string, text, varchar, char, boolean, bool,
	 *                          Y-N, T-F, bit, date, datetime, time, integer,
	 *                          int, number, double, float
	 * @return string
	 */
	static public function SQLValue($value, $datatype = self::SQLVALUE_TEXT) {
		$return_value = "";

		switch (strtolower(trim($datatype))) {
			case "text":
			case "string":
			case "varchar":
			case "char":
        // wolfgang@sybermon.com disabled because of kimai db structure
        // I had to disable the following as kimai db structure
        // does not allow NULL values
				//if (strlen($value) == 0) {
				//	$return_value = "NULL";
				//} else {
					if (get_magic_quotes_gpc()) {
						$value = stripslashes($value);
					}
					$return_value = "'" . str_replace("'", "''", $value) . "'";
				//}
				break;
			case "number":
			case "integer":
			case "int":
			case "double":
			case "float":
        // wolfgang@sybermon.com disabled because of kimai db structure
        // I had to disable the following as kimai db structure
        // does not allow NULL values
				if (is_numeric($value)) {
					$return_value = $value;
				} else {
					//$return_value = "NULL";
          $return_value = 0;
				}
				break;
			case "boolean":  //boolean to use this with a bit field
			case "bool":
			case "bit":
				if (self::GetBooleanValue($value)) {
				   $return_value = "1";
				} else {
				   $return_value = "0";
				}
				break;
			case "y-n":  //boolean to use this with a char(1) field
				if (self::GetBooleanValue($value)) {
					$return_value = "'Y'";
				} else {
					$return_value = "'N'";
				}
				break;
			case "t-f":  //boolean to use this with a char(1) field
				if (self::GetBooleanValue($value)) {
					$return_value = "'T'";
				} else {
					$return_value = "'F'";
				}
				break;
			case "date":
				if (self::IsDate($value)) {
					$return_value = "'" . date('Y-m-d', strtotime($value)) . "'";
				} else {
					$return_value = "NULL";
				}
				break;
			case "datetime":
				if (self::IsDate($value)) {
					$return_value = "'" . date('Y-m-d H:i:s', strtotime($value)) . "'";
				} else {
					$return_value = "NULL";
				}
				break;
			case "time":
				if (self::IsDate($value)) {
					$return_value = "'" . date('H:i:s', strtotime($value)) . "'";
				} else {
					$return_value = "NULL";
				}
				break;
			default:
				exit("ERROR: Invalid data type specified in SQLValue method");
		}
		return $return_value;
	}

	/**
	 * Returns last measured duration (time between TimerStart and TimerStop)
	 *
	 * @param integer $decimals (Optional) The number of decimal places to show
	 * @return Float Microseconds elapsed
	 */
	public function TimerDuration($decimals = 4) {
		return number_format($this->time_diff, $decimals);
	}

	/**
	 * Starts time measurement (in microseconds)
	 *
	 */
	public function TimerStart() {
		$parts = explode(" ", microtime());
		$this->time_diff = 0;
		$this->time_start = $parts[1].substr($parts[0],1);
	}

	/**
	 * Stops time measurement (in microseconds)
	 *
	 */
	public function TimerStop() {
		$parts  = explode(" ", microtime());
		$time_stop = $parts[1].substr($parts[0],1);
		$this->time_diff  = ($time_stop - $this->time_start);
		$this->time_start = 0;
	}

	/**
	 * Starts a transaction
	 *
	 * @return boolean Returns TRUE on success or FALSE on error
	 */
	public function TransactionBegin() {
		$this->ResetError();
		if (! $this->IsConnected()) {
			$this->SetError("No connection");
			return false;
		} else {
			if (! $this->in_transaction) {
				if (! mysql_query("START TRANSACTION", $this->mysql_link)) {
					$this->SetError();
					return false;
				} else {
					$this->in_transaction = true;
					return true;
				}
			} else {
				$this->SetError("Already in transaction", -1);
				return false;
			}
		}
	}

	/**
	 * Ends a transaction and commits the queries
	 *
	 * @return boolean Returns TRUE on success or FALSE on error
	 */
	public function TransactionEnd() {
		$this->ResetError();
		if (! $this->IsConnected()) {
			$this->SetError("No connection");
			return false;
		} else {
			if ($this->in_transaction) {
				if (! mysql_query("COMMIT", $this->mysql_link)) {
					// $this->TransactionRollback();
					$this->SetError();
					return false;
				} else {
					$this->in_transaction = false;
					return true;
				}
			} else {
				$this->SetError("Not in a transaction", -1);
				return false;
			}
		}
	}

	/**
	 * Rolls the transaction back
	 *
	 * @return boolean Returns TRUE on success or FALSE on failure
	 */
	public function TransactionRollback() {
		$this->ResetError();
		if (! $this->IsConnected()) {
			$this->SetError("No connection");
			return false;
		} else {
			if(! mysql_query("ROLLBACK", $this->mysql_link)) {
				$this->SetError("Could not rollback transaction");
				return false;
			} else {
				$this->in_transaction = false;
				return true;
			}
		}
	}

	/**
	 * Truncates a table removing all data
	 *
	 * @param string $tableName The name of the table
	 * @return boolean Returns TRUE on success or FALSE on error
	 */
	public function TruncateTable($tableName) {
		$this->ResetError();
		if (! $this->IsConnected()) {
			$this->SetError("No connection");
			return false;
		} else {
			$sql = "TRUNCATE TABLE `" . $tableName . "`";
			if (! $this->Query($sql)) {
				return false;
			} else {
				return true;
			}
		}
	}

	/**
	 * Updates rows in a table based on a WHERE filter
	 * (can be just one or many rows based on the filter)
	 *
	 * @param string $tableName The name of the table
	 * @param array $valuesArray An associative array containing the column
	 *                            names as keys and values as data. The values
	 *                            must be SQL ready (i.e. quotes around
	 *                            strings, formatted dates, ect)
	 * @param array $whereArray (Optional) An associative array containing the
	 *                           column names as keys and values as data. The
	 *                           values must be SQL ready (i.e. quotes around
	 *                           strings, formatted dates, ect). If not specified
	 *                           then all values in the table are updated.
	 * @return boolean Returns TRUE on success or FALSE on error
	 */
	public function UpdateRows($tableName, $valuesArray, $whereArray = null) {
		$this->ResetError();
		if (! $this->IsConnected()) {
			$this->SetError("No connection");
			return false;
		} else {
			$sql = self::BuildSQLUpdate($tableName, $valuesArray, $whereArray);
			// Execute the UPDATE
			if (! $this->Query($sql)) {
				return false;
			} else {
				return true;
			}
		}
	}
}
?>