New ADOdb driver that extends the standard mssql one. All it does is
to prepend the 'N' char before any SQL literal sent to DB, mainly because nobody (ODBTP, FreeTDS, ODBC, SQL*Server) seems to be doing this task, and it prevents, in an high degree true cross-db compatibility. Once we've moved to prepared statements and some of the developers for any of the products above (hopefully MS, at server level) will avoid the 'N', we'll be able to go back to another mssql drivers. More info at: - http://docs.moodle.org/en/XMLDB_Problems (point 8) - http://tracker.moodle.org/browse/MDL-6877
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stronk7
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<?php /// $Id $
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///////////////////////////////////////////////////////////////////////////
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// //
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// NOTICE OF COPYRIGHT //
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// //
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// ADOdb - Database Abstraction Library for PHP //
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// http://adodb.sourceforge.net/ //
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// //
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// Copyright (C) 2000-2006 John Lim (jlim\@natsoft.com.my) //
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// All rights reserved. //
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// Released under both BSD license and LGPL library license. //
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// Whenever there is any discrepancy between the two licenses, //
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// the BSD license will take precedence //
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// //
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// Moodle - Modular Object-Oriented Dynamic Learning Environment //
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// http://moodle.com //
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// //
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// Copyright (C) 2001-3001 Martin Dougiamas http://dougiamas.com //
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// (C) 2001-3001 Eloy Lafuente (stronk7) http://contiento.com //
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// //
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// This program is free software; you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation; either version 2 of the License, or //
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// (at your option) any later version. //
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// //
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// This program is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License for more details: //
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// //
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// http://www.gnu.org/copyleft/gpl.html //
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// //
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///////////////////////////////////////////////////////////////////////////
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/**
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* MSSQL Driver with auto-prepended "N" for correct unicode storage
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* of SQL literal strings. Intended to be used with MSSQL drivers that
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* are sending UCS-2 data to MSSQL (FreeTDS and ODBTP) in order to get
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* true cross-db compatibility from the application point of view.
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*/
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// security - hide paths
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if (!defined('ADODB_DIR')) die();
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// one useful constant
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if (!defined('SINGLEQUOTE')) define('SINGLEQUOTE', "'");
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include_once(ADODB_DIR.'/drivers/adodb-mssql.inc.php');
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class ADODB_mssql_n extends ADODB_mssql {
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var $databaseType = "mssql_n";
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function ADODB_mssqlpo()
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{
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ADODB_mssql::ADODB_mssql();
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}
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function _query($sql,$inputarr)
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{
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$sql = $this->_appendN($sql);
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return ADODB_mssql::_query($sql,$inputarr);
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}
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/**
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* This function will intercept all the literals used in the SQL, prepending the "N" char to them
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* in order to allow mssql to store properly data sent in the correct UCS-2 encoding (by freeTDS
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* and ODBTP) keeping SQL compatibility at ADOdb level (instead of hacking every project to add
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* the "N" notation when working against MSSQL.
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*
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* Note that this hack only must be used if ALL the char-based columns in your DB are of type nchar,
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* nvarchar and ntext
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*/
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function _appendN($sql) {
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$result = $sql;
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/// Check we have some single quote in the query. Exit ok.
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if (strpos($sql, SINGLEQUOTE) === false) {
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return $sql;
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}
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/// Check we haven't an odd number of single quotes (this can cause problems below
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/// and should be considered one wrong SQL). Exit with debug info.
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if ((substr_count($sql, SINGLEQUOTE) & 1)) {
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if ($this->debug) {
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ADOConnection::outp("{$this->databaseType} internal transformation: not converted. Wrong number of quotes (odd)");
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}
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return $sql;
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}
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/// Check we haven't any backslash + single quote combination. It should mean wrong
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/// backslashes use (bad magic_quotes_sybase?). Exit with debug info.
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$regexp = '/(\\\\' . SINGLEQUOTE . '[^' . SINGLEQUOTE . '])/';
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if (preg_match($regexp, $sql)) {
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if ($this->debug) {
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ADOConnection::outp("{$this->databaseType} internal transformation: not converted. Found bad use of backslash + single quote");
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}
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return $sql;
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}
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/// Remove pairs of single-quotes
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$pairs = array();
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$regexp = '/(' . SINGLEQUOTE . SINGLEQUOTE . ')/';
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preg_match_all($regexp, $result, $list_of_pairs);
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if ($list_of_pairs) {
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foreach (array_unique($list_of_pairs[0]) as $key=>$value) {
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$pairs['<@#@#@PAIR-'.$key.'@#@#@>'] = $value;
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}
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if (!empty($pairs)) {
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$result = str_replace($pairs, array_keys($pairs), $result);
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}
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}
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/// Remove the rest of literals present in the query
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$literals = array();
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$regexp = '/(N?' . SINGLEQUOTE . '.*?' . SINGLEQUOTE . ')/is';
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preg_match_all($regexp, $result, $list_of_literals);
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if ($list_of_literals) {
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foreach (array_unique($list_of_literals[0]) as $key=>$value) {
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$literals['<#@#@#LITERAL-'.$key.'#@#@#>'] = $value;
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}
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if (!empty($literals)) {
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$result = str_replace($literals, array_keys($literals), $result);
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}
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}
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/// Analyse literals to prepend the N char to them if their contents aren't numeric
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if (!empty($literals)) {
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foreach ($literals as $key=>$value) {
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if (!is_numeric(trim($value, SINGLEQUOTE))) {
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/// Non numeric string, prepend our dear N
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$literals[$key] = 'N' . trim($value, 'N'); //Trimming potentially existing previous "N"
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}
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}
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}
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/// Re-apply literals to the text
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if (!empty($literals)) {
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$result = str_replace(array_keys($literals), $literals, $result);
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}
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/// Re-apply pairs of single-quotes to the text
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if (!empty($pairs)) {
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$result = str_replace(array_keys($pairs), $pairs, $result);
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}
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/// Print transformation if debug = on
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if ($result != $sql && $this->debug) {
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ADOConnection::outp("{$this->databaseType} internal transformation:<br>{$sql}<br>to<br>{$result}");
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}
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return $result;
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}
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}
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class ADORecordset_mssql_n extends ADORecordset_mssql {
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var $databaseType = "mssql_n";
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function ADORecordset_mssql_n($id,$mode=false)
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{
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$this->ADORecordset_mssql($id,$mode);
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}
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}
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?>
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