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<?php // *************************************************************************** ******************************** // // Name: Database PHP Object // Version: 1.0 // Description: A PHP wrapper for working with various databases // Compatibility: PHP3, PHP4 // // Author: Simon Belak // E-mail: Simon_Belak@yahoo.com // // Last Modified: 01/12/2001 // // Copyright (c) Simon Belak // All rights reserved. // // This Software is distributed under the GPL. For a list of your obligations and rights // under this license please visit the GNU website at http://www.gnu.org/ // // *************************************************************************** ******************************** class DbObject { // *************************************************************************** ******************************** // *** (private) variables *** // *************************************************************************** ******************************** var $mDbType = ''; // Server (currently supported: MySQL,ODBC and MSSQL) var $mCaseFolding = TRUE; // Set this to false for easier field accessing, but with a bit of a preformance hit // see function GetField for details var $mLink_ID = 0; // Link identifier of the currently opened connection var $mQuery_ID = 0; // Result indenifier of the last query var $EOF = TRUE; // End Of File (recordset) var $BOF = TRUE; // Begining Of File (reocrdset) var $mRecord = array(); // Current record var $mCurrentRow = -1; // Current row var $mNumRows = -1; // Number of rows in the recordset var $mNumFields = -1; // Number of fields in the recordset var $mFieldNames = array(); // Names of fields in the recordset // *************************************************************************** ******************************** // *** Constructor *** // *************************************************************************** ******************************** function DbObject($dbType='',$host='',$dbName='',$user='',$password='') { if (''==$dbType && ''==$this->mDbType) { $this->_Halt('Server is not selected'); } else if (''==$dbType) { $dbType=$this->mDbType; } else { $this->mDbType=$dbType; } // if $this->Connect($host,$dbName,$user,$password); } // DbObject - constructor // *************************************************************************** ******************************** // *** Public functions *** // *************************************************************************** ******************************** function SelectServer($dbType='',$host='',$dbName='',$user='',$password='') { if (''==$dbType) { $this->_Halt('Server is not selected'); return FALSE; } return $this->_ResetConnection ($dbType,$host,$dbName,$user,$password); } // SelectServer function SelectHost($host='',$dbName='',$user='',$password='') { if (''==$host) { $this->_Halt('Host is not selected'); return FALSE; } // if return $this->_ResetConnection($this- >mDbType,$host,$dbName,$user,$password); } // SelectHost function SelectDb($dbName='',$user='',$password='') { if (''==$dbName) { $this->_Halt('Database name is not set'); return FALSE; } // if $this->FreeResult(); if (FALSE==$this->_db_select_db($dbName,$user,$password)) { $this->_Halt('Error using database: '.$dbName); return FALSE; } // if return TRUE; } // SelectDb function Connect($host='',$dbName='',$user='',$password='') { if ( 0 == $this->mLink_ID ) { $this->mLink_ID=$this->_db_connect($host,$user,$password); if (FALSE==$this->mLink_ID) { $this->_Halt('mLink_ID == FALSE, connect failed'); return FALSE; } // if if ($dbName!='') { $this->SelectDb($dbName,$user,$password); } } // if return $this->mLink_ID; } // Connect function Close() { $status=TRUE; if ( 0 != $this->mLink_ID && FALSE != $this->mLink_ID) { $this->FreeResult(); $status=$this->_db_close(); $this->mLink_ID = 0; } // if return $status; } // Close function FreeResult() { $status=TRUE; if (0 != $this->mQuery_ID && FALSE != $this->mQuery_ID) { $this->mRecord = array(); $this->mCurrentRow = -1; $this->mNumRows = -1; $this->mNumFields = -1; $this->mFieldNames = array(); $this->BOF=TRUE; $this->EOF=TRUE; $status=$this->_db_free_result(); $this->mQuery_ID = 0; } // if return $status; } // FreeResult function Query($query='') { $this->Connect(); $this->FreeResult(); $this->mQuery_ID = $this->_db_query($query); if (FALSE==$this->mQuery_ID) { $this->_Halt('Invalid SQL: '.$query); return FALSE; } else if (1==$this->mQuery_ID) { $this->mQuery_ID=0; } else { $this->mNumRows = $this->_db_num_rows(); $this->mNumFields = $this->_db_num_fields(); $this->mFieldNames = $this->_SetFieldNames(); $this->BOF=TRUE; if (0 < $this->mNumRows) { $this->EOF=FALSE; } else { $this->EOF=TRUE; } // if } // if return $this->mQuery_ID; } // Query function GoToRecord($pos=0) { $status=TRUE; if ($pos > $this->mNumRows-1) { $this->mCurrentRow = -1; $this->EOF=TRUE; $status=FALSE; } else if ($pos < 0) { $this->mCurrentRow = -1; $this->BOF=TRUE; $status=FALSE; } else { if ($pos !=$this-> mCurrentRow+1) // Optimization: if we move one record forward, data_seek isn't needed { if (FALSE == $this->_db_data_seek($pos)) // Unexpected error { return FALSE; } // if } // if $this->mCurrentRow = $pos; $this->mRecord = $this->_db_fetch_array(); $status = is_array($this->mRecord); // Unexpected error $this->BOF=FALSE; $this->EOF=FALSE; } // if return $status; } // GoToRecord function GetField($index=0) { if (FALSE != $this->EOF || FALSE != $this->BOF) { return FALSE; } // if if (FALSE == $this->mCaseFolding && FALSE != is_string($index)) { $index = strtoupper($index); reset($this->mFieldNames); while (list(,$name)=each($this->mFieldNames)) { if (strtoupper($name) == $index) { $index=$name; BREAK; } // if } // while } // if if (FALSE==isset($this->mRecord[$index])) { return FALSE; } // if return $this->mRecord[$index]; } // GetField function NextRecord() { return $this->GoToRecord($this->mCurrentRow + 1); } // NextRecord function PreviousRecord() { return $this->GoToRecord($this->mCurrentRow-1); } // PreviousRecord function GoToRecordRelative($pos=0) { return $this->GoToRecord($this->mCurrentRow+$pos); } // GoToRecordRelative function FirstRecord() { return $this->GoToRecord(0); } // FirstRecord function LastRecord() { return $this->GoToRecord($this->mNumRows-1); } // LastRecord function GetNumFields() { if (-1==$this->mNumFields) { $this->mNumFields = $this->_db_num_fields(); } // if return $this->mNumFields; } // GetNumFields function GetNumRows() { if (-1==$this->mNumRows) { $this->mNumRows = $this->_db_num_rows(); } // if return $this->mNumRows; } // GetNumRows function GetFieldNames($pos=-1) { if (1 > count($this->mFieldNames)) { $this->_SetFieldNames(); } // if if (-1< $pos && count($this->mFieldNames) > $pos) { return $this->mFieldNames[$pos]; } else { return $this->mFieldNames; } // if } // GetFieldNames function SetCaseFolding($val=TRUE) { $this->mCaseFolding=$val; return TRUE; } // SetCaseFolding // *************************************************************************** ******************************** // *** Private functions *** // *************************************************************************** ******************************** function _Halt($msg='') { $this->Close(); printf("</td></tr></table><b>Error:</b> %s<br>\n", $msg); // we escape the html table so that Netscape (and other browsers) can display this page properly die('Session halted.'); return TRUE; } // _Halt function _ResetConnection($dbType='',$host='',$dbName='',$user='',$password='') { $this->Close(); $this->mDbType=$dbType; $this->Connect($host,$dbName,$user,$password); if ( 0 == $this->mLink_ID || FALSE == $this->mLink_ID) { return FALSE; } // if return TRUE; } // _ResetConnection function _SetFieldNames() { for ($i=0;$i<$this->mNumFields;$i++) { $this->mFieldNames[]=$this->_db_field_name($i); } // for return $this->mFieldNames; } // _SetFieldNames // *************************************************************************** ******************************** // *** Functios that unify database accessing *** // *************************************************************************** ******************************** function _db_connect($host='',$user='',$password='') { switch (strtoupper($this->mDbType)) { case 'MYSQL': return mysql_connect($host, $user, $password); case 'ODBC': // odbc_connect doesn't accept the argument host, and is therefore (in functionalaty) the same as select_db, // so we just skip the connect step and call odbc_connect in select_db step return TRUE; case 'MSSQL': return mssql_connect($host, $user, $password); default: $this->_Halt('Server is not selected'); return FALSE; } // switch } // _db_connect function _db_close() { switch (strtoupper($this->mDbType)) { case 'MYSQL': return mysql_close($this->mLink_ID); case 'ODBC': return odbc_close($this->mLink_ID); case 'MSSQL': return mssql_close($this->mLink_ID); default: $this->_Halt('Server is not selected'); return FALSE; } // switch } // _db_close function _db_select_db($dbName='',$user='',$password='') { switch (strtoupper($this->mDbType)) { case 'MYSQL': return mysql_select_db($dbName,$this->mLink_ID); case 'ODBC': // See _db_connect case "ODBC" for details $this->mLink_ID=odbc_connect($dbName, $user, $password,SQL_CUR_USE_ODBC); if (FALSE==$this->mLink_ID) { return FALSE; } else { return TRUE; } // if case 'MSSQL': return mssql_select_db($dbName,$this->mLink_ID); default: $this->_Halt('Server is not selected'); return FALSE; } // switch } // _db_select_db function _db_free_result() { switch (strtoupper($this->mDbType)) { case 'MYSQL': return mysql_free_result($this->mQuery_ID); case 'ODBC': return odbc_free_result($this->mQuery_ID); case 'MSSQL': return mssql_free_result($this->mQuery_ID); default: $this->_Halt('Server is not selected'); return FALSE; } // switch } // _db_free_result function _db_query($query='') { switch (strtoupper($this->mDbType)) { case 'MYSQL': { $temp_query_id=mysql_query($query,$this- >mLink_ID); // Becouse for queries DELETE, INSERT, REPLACE and UPDATE mysql doesn't return a result indenifier // We (in those cases) set the result indenifier to 1, so we can distict it from a failed query if (FALSE==$temp_query_id && 0 < mysql_affected_rows($this->mLink_ID)) { $temp_query_id = 1; } // if return $temp_query_id; } // case 'MySQL' case 'ODBC': return odbc_exec($this->mLink_ID,$query); case 'MSSQL': return mssql_query($query,$this->mLink_ID); default: $this->_Halt('Server is not selected'); return FALSE; } // switch } // _db_query function _db_fetch_array() { switch (strtoupper($this->mDbType)) { case 'MYSQL': return mysql_fetch_array($this->mQuery_ID); case 'ODBC': // A unfied result: { // Record is returned in an array with numeric keys and field names for keys // Row and field counting start is set to 0 (ODBC default is 1) if (FALSE != odbc_fetch_row($this->mQuery_ID,$this- >mCurrentRow+1)) { $resultArray = array(); for ($i=0;$i < odbc_num_fields($this- >mQuery_ID);$i++) { $name=odbc_field_name($this- >mQuery_ID,$i+1); $resultArray[$name]=null; unset($resultArray[$name]); // isset() function now returns false, but the field name key stays if (FALSE != odbc_result($this- >mQuery_ID,$i+1)) { $resultArray[$i]= ($resultArray[$name] = odbc_result($this->mQuery_ID,$i+1)); } // if } // for return $resultArray; } else { return FALSE; } // if } // case 'ODBC' case 'MSSQL': return mssql_fetch_array($this->mQuery_ID); default: $this->_Halt('Server is not selected'); return FALSE; } // switch } // _db_fetch_array function _db_data_seek($pos=0) { switch (strtoupper($this->mDbType)) { case 'MYSQL': return mysql_data_seek($this->mQuery_ID, $pos); case 'ODBC': // No need to move the internal pointer becouse we provide the optional row_number argument for odbc_fatch_row return TRUE; case 'MSSQL': return mssql_data_seek($this->mQuery_ID, $pos); default: $this->_Halt('Server is not selected'); return FALSE; } // switch } // _db_data_seek function _db_num_rows() { switch (strtoupper($this->mDbType)) { case 'MYSQL': return mysql_num_Rows($this->mQuery_ID); case 'ODBC': { $numRows=odbc_num_Rows($this->mQuery_ID); // Some ODBC drivers don't support odbc_num_rows for results of an SELECT query and return an error (-1) if (-1==$numRows) { // Optimization: first we roughly estemate the number of rows // than the last 9 are counted for ($i=0;FALSE != odbc_fetch_Row($this- >mQuery_ID,$i+10);$i+=10); for ($numRows=$i+1;FALSE ! =odbc_fetch_Row($this->mQuery_ID,$numRows+1);$numRows++); odbc_fetch_Row($this->mQuery_ID,$this- >mCurrentRow); // We set the internal pointer back to where we started } // if return $numRows; } // case 'ODBC' case 'MSSQL': return mssql_num_Rows($this->mQuery_ID); default: $this->_Halt('Server is not selected'); return FALSE; } // switch } // _db_num_rows function _db_num_fields() { switch (strtoupper($this->mDbType)) { case 'MYSQL': return mysql_num_fields($this->mQuery_ID); case 'ODBC': return odbc_num_fields($this->mQuery_ID); case 'MSSQL': return mssql_num_fields($this->mQuery_ID); default: $this->_Halt('Server is not selected'); return FALSE; } // switch } // _db_num_fields function _db_field_name($fieldNumber=0) { switch (strtoupper($this->mDbType)) { case 'MYSQL': return mysql_field_name($this->mQuery_ID , $fieldNumber); case 'ODBC': return odbc_field_name($this->mQuery_ID , $fieldNumber+1); case 'MSSQL': return mssql_field_name($this->mQuery_ID , $fieldNumber); default: $this->_Halt('Server is not selected'); return FALSE; } // switch } // _db_field_name } // class // *************************************************************************** ******************************** // // *** Class DbObject *** // // Public variables: 0 // // Private variables: 11 // // $mDbType Server (currently supported: MySQL,ODBC and MSSQL) // // $mCaseFolding Set this to false for easier field accessing, but with a bit of a preformance hit // see function GetField for details // // $mLink_ID Link identifier of the currently opened connection // $mQuery_ID Result indenifier of the last query // // $EOF End Of File (recordset) // $BOF Begining Of File (reocrdset) // // $mRecord Current record // $mCurrentRow Current row // // $mNumRows Number of rows in the recordset // $mNumFields Number of fields in the recordset // $mFieldNames Names of fields in the recordset // // Custom cunstuctor: yes (DbObject) // // Public functions: 18 // // SelectServer ($dbType='',$host='',$dbName='',$user='',$password='') // SelectHost($host='',$dbName='',$user='',$password='') // SelectDb($dbName='',$user='',$password='') // // Connect($host='',$dbName='',$user='',$password='') // Close() // // FreeResult() // // Query($query='') // // GoToRecord($pos=0) // GoToRecordRelative($pos=0) // NextRecord() // PreviousRecord() // FirstRecord() // LastRecord() // // GetField($index=0) // // GetNumFields() // GetNumRows() // GetFieldNames($pos=-1) // // SetCaseFolding($val=TRUE) // // Private functions: 3 // // _Halt($msg='') // _ResetConnection ($dbType='',$host='',$dbName='',$user='',$password='') // _SetFieldNames() // // Special: yes - Functios that unify database accessing // // _db_connect($host='',$user='',$password='') // _db_close() // _db_select_db($dbName='',$user='',$password='') // _db_free_result() // _db_query($query='') // _db_fetch_array() // _db_data_seek($pos=0) // _db_num_rows() // _db_num_fields() // _db_field_name($fieldNumber=0) // // // // *** Example: *** // // 1. $db1 = new DbObject("Mysql","host","database","user","password"); // // 2. $db1->Query("select * from mytable1"); // // 3. while ($db1->NextRecord()) // 4. { // 5. for ($i=0;$i<$db1->GetNumFields();$i++) // 6. { // 7. echo $db1->GetField($i); // 8. } // 9. } // // 10. $db1->FirstRecord(); // 11. echo $db1->GetField("fieldname1"); // // 12. $db1->SetCaseFolding(FALSE); // 13. echo $db1->GetField("fiELDnaME1"); // // *************************************************************************** ******************************** ?> | ||||||||||
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