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   1  <?php
   2  
   3  /// $Id $
   4  
   5  ///////////////////////////////////////////////////////////////////////////
   6  //                                                                       //
   7  // NOTICE OF COPYRIGHT                                                   //
   8  //                                                                       //
   9  // ADOdb  - Database Abstraction Library for PHP                         //
  10  //          http://adodb.sourceforge.net/                                //
  11  //                                                                       //
  12  // Copyright (c) 2000-2014 John Lim (jlim\@natsoft.com.my)               //
  13  //          All rights reserved.                                         //
  14  //          Released under both BSD license and LGPL library license.    //
  15  //          Whenever there is any discrepancy between the two licenses,  //
  16  //          the BSD license will take precedence                         //
  17  //                                                                       //
  18  // Moodle - Modular Object-Oriented Dynamic Learning Environment         //
  19  //          http://moodle.com                                            //
  20  //                                                                       //
  21  // Copyright (C) 2001-3001 Martin Dougiamas        http://dougiamas.com  //
  22  //           (C) 2001-3001 Eloy Lafuente (stronk7) http://contiento.com  //
  23  //                                                                       //
  24  // This program is free software; you can redistribute it and/or modify  //
  25  // it under the terms of the GNU General Public License as published by  //
  26  // the Free Software Foundation; either version 2 of the License, or     //
  27  // (at your option) any later version.                                   //
  28  //                                                                       //
  29  // This program is distributed in the hope that it will be useful,       //
  30  // but WITHOUT ANY WARRANTY; without even the implied warranty of        //
  31  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         //
  32  // GNU General Public License for more details:                          //
  33  //                                                                       //
  34  //          http://www.gnu.org/copyleft/gpl.html                         //
  35  //                                                                       //
  36  ///////////////////////////////////////////////////////////////////////////
  37  
  38  /**
  39  *  MSSQL Driver with auto-prepended "N" for correct unicode storage
  40  *  of SQL literal strings. Intended to be used with MSSQL drivers that
  41  *  are sending UCS-2 data to MSSQL (FreeTDS and ODBTP) in order to get
  42  *  true cross-db compatibility from the application point of view.
  43  */
  44  
  45  // security - hide paths
  46  if (!defined('ADODB_DIR')) die();
  47  
  48  // one useful constant
  49  if (!defined('SINGLEQUOTE')) define('SINGLEQUOTE', "'");
  50  
  51  include_once(ADODB_DIR.'/drivers/adodb-mssql.inc.php');
  52  
  53  class ADODB_mssql_n extends ADODB_mssql {
  54      var $databaseType = "mssql_n";
  55  
  56  	function ADODB_mssqlpo()
  57      {
  58          ADODB_mssql::ADODB_mssql();
  59      }
  60  
  61  	function _query($sql,$inputarr=false)
  62      {
  63          $sql = $this->_appendN($sql);
  64          return ADODB_mssql::_query($sql,$inputarr);
  65      }
  66  
  67      /**
  68       * This function will intercept all the literals used in the SQL, prepending the "N" char to them
  69       * in order to allow mssql to store properly data sent in the correct UCS-2 encoding (by freeTDS
  70       * and ODBTP) keeping SQL compatibility at ADOdb level (instead of hacking every project to add
  71       * the "N" notation when working against MSSQL.
  72       *
  73       * Note that this hack only must be used if ALL the char-based columns in your DB are of type nchar,
  74       * nvarchar and ntext
  75       */
  76      function _appendN($sql) {
  77  
  78          $result = $sql;
  79  
  80      /// Check we have some single quote in the query. Exit ok.
  81          if (strpos($sql, SINGLEQUOTE) === false) {
  82              return $sql;
  83          }
  84  
  85      /// Check we haven't an odd number of single quotes (this can cause problems below
  86      /// and should be considered one wrong SQL). Exit with debug info.
  87          if ((substr_count($sql, SINGLEQUOTE) & 1)) {
  88              if ($this->debug) {
  89                  ADOConnection::outp("{$this->databaseType} internal transformation: not converted. Wrong number of quotes (odd)");
  90              }
  91              return $sql;
  92          }
  93  
  94      /// Check we haven't any backslash + single quote combination. It should mean wrong
  95      /// backslashes use (bad magic_quotes_sybase?). Exit with debug info.
  96          $regexp = '/(\\\\' . SINGLEQUOTE . '[^' . SINGLEQUOTE . '])/';
  97          if (preg_match($regexp, $sql)) {
  98              if ($this->debug) {
  99                  ADOConnection::outp("{$this->databaseType} internal transformation: not converted. Found bad use of backslash + single quote");
 100              }
 101              return $sql;
 102          }
 103  
 104      /// Remove pairs of single-quotes
 105          $pairs = array();
 106          $regexp = '/(' . SINGLEQUOTE . SINGLEQUOTE . ')/';
 107          preg_match_all($regexp, $result, $list_of_pairs);
 108          if ($list_of_pairs) {
 109              foreach (array_unique($list_of_pairs[0]) as $key=>$value) {
 110                  $pairs['<@#@#@PAIR-'.$key.'@#@#@>'] = $value;
 111              }
 112              if (!empty($pairs)) {
 113                  $result = str_replace($pairs, array_keys($pairs), $result);
 114              }
 115          }
 116  
 117      /// Remove the rest of literals present in the query
 118          $literals = array();
 119          $regexp = '/(N?' . SINGLEQUOTE . '.*?' . SINGLEQUOTE . ')/is';
 120          preg_match_all($regexp, $result, $list_of_literals);
 121          if ($list_of_literals) {
 122              foreach (array_unique($list_of_literals[0]) as $key=>$value) {
 123                  $literals['<#@#@#LITERAL-'.$key.'#@#@#>'] = $value;
 124              }
 125              if (!empty($literals)) {
 126                  $result = str_replace($literals, array_keys($literals), $result);
 127              }
 128          }
 129  
 130  
 131      /// Analyse literals to prepend the N char to them if their contents aren't numeric
 132          if (!empty($literals)) {
 133              foreach ($literals as $key=>$value) {
 134                  if (!is_numeric(trim($value, SINGLEQUOTE))) {
 135                  /// Non numeric string, prepend our dear N
 136                      $literals[$key] = 'N' . trim($value, 'N'); //Trimming potentially existing previous "N"
 137                  }
 138              }
 139          }
 140  
 141      /// Re-apply literals to the text
 142          if (!empty($literals)) {
 143              $result = str_replace(array_keys($literals), $literals, $result);
 144          }
 145  
 146      /// Any pairs followed by N' must be switched to N' followed by those pairs
 147      /// (or strings beginning with single quotes will fail)
 148          $result = preg_replace("/((<@#@#@PAIR-(\d+)@#@#@>)+)N'/", "N'$1", $result);
 149  
 150      /// Re-apply pairs of single-quotes to the text
 151          if (!empty($pairs)) {
 152              $result = str_replace(array_keys($pairs), $pairs, $result);
 153          }
 154  
 155      /// Print transformation if debug = on
 156          if ($result != $sql && $this->debug) {
 157              ADOConnection::outp("{$this->databaseType} internal transformation:<br>{$sql}<br>to<br>{$result}");
 158          }
 159  
 160          return $result;
 161      }
 162  }
 163  
 164  class ADORecordset_mssql_n extends ADORecordset_mssql {
 165      var $databaseType = "mssql_n";
 166  	function ADORecordset_mssql_n($id,$mode=false)
 167      {
 168          $this->ADORecordset_mssql($id,$mode);
 169      }
 170  }