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<?php
/// $Id $
///////////////////////////////////////////////////////////////////////////
// //
// NOTICE OF COPYRIGHT //
// //
// ADOdb - Database Abstraction Library for PHP //
// http://adodb.sourceforge.net/ //
// //
// Copyright (C) 2000-2007 John Lim (jlim\@natsoft.com.my) //
// All rights reserved. //
// Released under both BSD license and LGPL library license. //
// Whenever there is any discrepancy between the two licenses, //
// the BSD license will take precedence //
// //
// Moodle - Modular Object-Oriented Dynamic Learning Environment //
// http://moodle.com //
// //
// Copyright (C) 2001-3001 Martin Dougiamas http://dougiamas.com //
// (C) 2001-3001 Eloy Lafuente (stronk7) http://contiento.com //
// //
// This program is free software; you can redistribute it and/or modify //
// it under the terms of the GNU General Public License as published by //
// the Free Software Foundation; either version 2 of the License, or //
// (at your option) any later version. //
// //
// This program is distributed in the hope that it will be useful, //
// but WITHOUT ANY WARRANTY; without even the implied warranty of //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
// GNU General Public License for more details: //
// //
// http://www.gnu.org/copyleft/gpl.html //
// //
///////////////////////////////////////////////////////////////////////////
/**
* MSSQL Driver with auto-prepended "N" for correct unicode storage
* of SQL literal strings. Intended to be used with MSSQL drivers that
* are sending UCS-2 data to MSSQL (FreeTDS and ODBTP) in order to get
* true cross-db compatibility from the application point of view.
*/
// security - hide paths
if (!defined('ADODB_DIR')) die();
// one useful constant
if (!defined('SINGLEQUOTE')) define('SINGLEQUOTE', "'");
include_once(ADODB_DIR.'/drivers/adodb-mssql.inc.php');
class ADODB_mssql_n extends ADODB_mssql {
var $databaseType = "mssql_n";
function ADODB_mssqlpo()
{
ADODB_mssql::ADODB_mssql();
}
function _query($sql,$inputarr)
{
$sql = $this->_appendN($sql);
return ADODB_mssql::_query($sql,$inputarr);
}
/**
* This function will intercept all the literals used in the SQL, prepending the "N" char to them
* in order to allow mssql to store properly data sent in the correct UCS-2 encoding (by freeTDS
* and ODBTP) keeping SQL compatibility at ADOdb level (instead of hacking every project to add
* the "N" notation when working against MSSQL.
*
* Note that this hack only must be used if ALL the char-based columns in your DB are of type nchar,
* nvarchar and ntext
*/
function _appendN($sql) {
$result = $sql;
/// Check we have some single quote in the query. Exit ok.
if (strpos($sql, SINGLEQUOTE) === false) {
return $sql;
}
/// Check we haven't an odd number of single quotes (this can cause problems below
/// and should be considered one wrong SQL). Exit with debug info.
if ((substr_count($sql, SINGLEQUOTE) & 1)) {
if ($this->debug) {
ADOConnection::outp("{$this->databaseType} internal transformation: not converted. Wrong number of quotes (odd)");
}
return $sql;
}
/// Check we haven't any backslash + single quote combination. It should mean wrong
/// backslashes use (bad magic_quotes_sybase?). Exit with debug info.
$regexp = '/(\\\\' . SINGLEQUOTE . '[^' . SINGLEQUOTE . '])/';
if (preg_match($regexp, $sql)) {
if ($this->debug) {
ADOConnection::outp("{$this->databaseType} internal transformation: not converted. Found bad use of backslash + single quote");
}
return $sql;
}
/// Remove pairs of single-quotes
$pairs = array();
$regexp = '/(' . SINGLEQUOTE . SINGLEQUOTE . ')/';
preg_match_all($regexp, $result, $list_of_pairs);
if ($list_of_pairs) {
foreach (array_unique($list_of_pairs[0]) as $key=>$value) {
$pairs['<@#@#@PAIR-'.$key.'@#@#@>'] = $value;
}
if (!empty($pairs)) {
$result = str_replace($pairs, array_keys($pairs), $result);
}
}
/// Remove the rest of literals present in the query
$literals = array();
$regexp = '/(N?' . SINGLEQUOTE . '.*?' . SINGLEQUOTE . ')/is';
preg_match_all($regexp, $result, $list_of_literals);
if ($list_of_literals) {
foreach (array_unique($list_of_literals[0]) as $key=>$value) {
$literals['<#@#@#LITERAL-'.$key.'#@#@#>'] = $value;
}
if (!empty($literals)) {
$result = str_replace($literals, array_keys($literals), $result);
}
}
/// Analyse literals to prepend the N char to them if their contents aren't numeric
if (!empty($literals)) {
foreach ($literals as $key=>$value) {
if (!is_numeric(trim($value, SINGLEQUOTE))) {
/// Non numeric string, prepend our dear N
$literals[$key] = 'N' . trim($value, 'N'); //Trimming potentially existing previous "N"
}
}
}
/// Re-apply literals to the text
if (!empty($literals)) {
$result = str_replace(array_keys($literals), $literals, $result);
}
/// Any pairs followed by N' must be switched to N' followed by those pairs
/// (or strings beginning with single quotes will fail)
$result = preg_replace("/((<@#@#@PAIR-(\d+)@#@#@>)+)N'/", "N'$1", $result);
/// Re-apply pairs of single-quotes to the text
if (!empty($pairs)) {
$result = str_replace(array_keys($pairs), $pairs, $result);
}
/// Print transformation if debug = on
if ($result != $sql && $this->debug) {
ADOConnection::outp("{$this->databaseType} internal transformation:<br>{$sql}<br>to<br>{$result}");
}
return $result;
}
}
class ADORecordset_mssql_n extends ADORecordset_mssql {
var $databaseType = "mssql_n";
function ADORecordset_mssql_n($id,$mode=false)
{
$this->ADORecordset_mssql($id,$mode);
}
}
?>
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