171 lines
7.1 KiB
PHP
171 lines
7.1 KiB
PHP
<?php
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/// $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) 2000-2008 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, $result);
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}
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/// Any pairs followed by N' must be switched to N' followed by those pairs
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/// (or strings beginning with single quotes will fail)
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$result = preg_replace("/((<@#@#@PAIR-(\d+)@#@#@>)+)N'/", "N'$1", $result);
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/// Re-apply pairs of single-quotes to the text
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if (!empty($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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