--- /dev/null
+<?php /// $Id $
+
+///////////////////////////////////////////////////////////////////////////
+// //
+// NOTICE OF COPYRIGHT //
+// //
+// ADOdb - Database Abstraction Library for PHP //
+// http://adodb.sourceforge.net/ //
+// //
+// Copyright (C) 2000-2006 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, $result);
+ }
+
+ /// Re-apply pairs of single-quotes to the text
+ if (!empty($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);
+ }
+}
+?>
projects / moodle.git / commitdiff