[903] | 1 | <?php
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| 2 |
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| 3 | /// $Id $
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| 4 |
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| 5 | ///////////////////////////////////////////////////////////////////////////
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| 6 | // //
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| 7 | // NOTICE OF COPYRIGHT //
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| 8 | // //
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| 9 | // ADOdb - Database Abstraction Library for PHP //
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| 10 | // http://adodb.sourceforge.net/ //
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| 11 | // //
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| 12 | // Copyright (C) 2000-2007 John Lim (jlim\@natsoft.com.my) //
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| 13 | // All rights reserved. //
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| 14 | // Released under both BSD license and LGPL library license. //
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| 15 | // Whenever there is any discrepancy between the two licenses, //
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| 16 | // the BSD license will take precedence //
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| 17 | // //
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| 18 | // Moodle - Modular Object-Oriented Dynamic Learning Environment //
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| 19 | // http://moodle.com //
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| 20 | // //
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| 21 | // Copyright (C) 2001-3001 Martin Dougiamas http://dougiamas.com //
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| 22 | // (C) 2001-3001 Eloy Lafuente (stronk7) http://contiento.com //
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| 23 | // //
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| 24 | // This program is free software; you can redistribute it and/or modify //
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| 25 | // it under the terms of the GNU General Public License as published by //
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| 26 | // the Free Software Foundation; either version 2 of the License, or //
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| 27 | // (at your option) any later version. //
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| 28 | // //
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| 29 | // This program is distributed in the hope that it will be useful, //
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| 30 | // but WITHOUT ANY WARRANTY; without even the implied warranty of //
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| 31 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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| 32 | // GNU General Public License for more details: //
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| 33 | // //
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| 34 | // http://www.gnu.org/copyleft/gpl.html //
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| 35 | // //
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| 36 | ///////////////////////////////////////////////////////////////////////////
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| 37 |
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| 38 | /**
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| 39 | * MSSQL Driver with auto-prepended "N" for correct unicode storage
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| 40 | * of SQL literal strings. Intended to be used with MSSQL drivers that
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| 41 | * are sending UCS-2 data to MSSQL (FreeTDS and ODBTP) in order to get
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| 42 | * true cross-db compatibility from the application point of view.
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| 43 | */
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| 44 |
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| 45 | // security - hide paths
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| 46 | if (!defined('ADODB_DIR')) die();
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| 47 |
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| 48 | // one useful constant
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| 49 | if (!defined('SINGLEQUOTE')) define('SINGLEQUOTE', "'");
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| 50 |
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| 51 | include_once(ADODB_DIR.'/drivers/adodb-mssql.inc.php');
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| 52 |
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| 53 | class ADODB_mssql_n extends ADODB_mssql {
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| 54 | var $databaseType = "mssql_n";
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| 55 |
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| 56 | function ADODB_mssqlpo()
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| 57 | {
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| 58 | ADODB_mssql::ADODB_mssql();
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| 59 | }
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| 60 |
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| 61 | function _query($sql,$inputarr)
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| 62 | {
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| 63 | $sql = $this->_appendN($sql);
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| 64 | return ADODB_mssql::_query($sql,$inputarr);
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| 65 | }
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| 66 |
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| 67 | /**
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| 68 | * This function will intercept all the literals used in the SQL, prepending the "N" char to them
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| 69 | * in order to allow mssql to store properly data sent in the correct UCS-2 encoding (by freeTDS
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| 70 | * and ODBTP) keeping SQL compatibility at ADOdb level (instead of hacking every project to add
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| 71 | * the "N" notation when working against MSSQL.
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| 72 | *
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| 73 | * 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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| 74 | * nvarchar and ntext
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| 75 | */
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| 76 | function _appendN($sql) {
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| 77 |
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| 78 | $result = $sql;
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| 79 |
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| 80 | /// Check we have some single quote in the query. Exit ok.
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| 81 | if (strpos($sql, SINGLEQUOTE) === false) {
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| 82 | return $sql;
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| 83 | }
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| 84 |
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| 85 | /// Check we haven't an odd number of single quotes (this can cause problems below
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| 86 | /// and should be considered one wrong SQL). Exit with debug info.
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| 87 | if ((substr_count($sql, SINGLEQUOTE) & 1)) {
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| 88 | if ($this->debug) {
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| 89 | ADOConnection::outp("{$this->databaseType} internal transformation: not converted. Wrong number of quotes (odd)");
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| 90 | }
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| 91 | return $sql;
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| 92 | }
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| 93 |
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| 94 | /// Check we haven't any backslash + single quote combination. It should mean wrong
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| 95 | /// backslashes use (bad magic_quotes_sybase?). Exit with debug info.
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| 96 | $regexp = '/(\\\\' . SINGLEQUOTE . '[^' . SINGLEQUOTE . '])/';
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| 97 | if (preg_match($regexp, $sql)) {
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| 98 | if ($this->debug) {
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| 99 | ADOConnection::outp("{$this->databaseType} internal transformation: not converted. Found bad use of backslash + single quote");
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| 100 | }
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| 101 | return $sql;
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| 102 | }
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| 103 |
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| 104 | /// Remove pairs of single-quotes
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| 105 | $pairs = array();
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| 106 | $regexp = '/(' . SINGLEQUOTE . SINGLEQUOTE . ')/';
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| 107 | preg_match_all($regexp, $result, $list_of_pairs);
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| 108 | if ($list_of_pairs) {
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| 109 | foreach (array_unique($list_of_pairs[0]) as $key=>$value) {
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| 110 | $pairs['<@#@#@PAIR-'.$key.'@#@#@>'] = $value;
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| 111 | }
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| 112 | if (!empty($pairs)) {
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| 113 | $result = str_replace($pairs, array_keys($pairs), $result);
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| 114 | }
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| 115 | }
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| 116 |
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| 117 | /// Remove the rest of literals present in the query
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| 118 | $literals = array();
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| 119 | $regexp = '/(N?' . SINGLEQUOTE . '.*?' . SINGLEQUOTE . ')/is';
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| 120 | preg_match_all($regexp, $result, $list_of_literals);
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| 121 | if ($list_of_literals) {
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| 122 | foreach (array_unique($list_of_literals[0]) as $key=>$value) {
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| 123 | $literals['<#@#@#LITERAL-'.$key.'#@#@#>'] = $value;
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| 124 | }
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| 125 | if (!empty($literals)) {
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| 126 | $result = str_replace($literals, array_keys($literals), $result);
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| 127 | }
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| 128 | }
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| 129 |
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| 130 | /// Analyse literals to prepend the N char to them if their contents aren't numeric
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| 131 | if (!empty($literals)) {
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| 132 | foreach ($literals as $key=>$value) {
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| 133 | if (!is_numeric(trim($value, SINGLEQUOTE))) {
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| 134 | /// Non numeric string, prepend our dear N
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| 135 | $literals[$key] = 'N' . trim($value, 'N'); //Trimming potentially existing previous "N"
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| 136 | }
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| 137 | }
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| 138 | }
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| 139 |
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| 140 | /// Re-apply literals to the text
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| 141 | if (!empty($literals)) {
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| 142 | $result = str_replace(array_keys($literals), $literals, $result);
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| 143 | }
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| 144 |
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| 145 | /// Re-apply pairs of single-quotes to the text
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| 146 | if (!empty($pairs)) {
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| 147 | $result = str_replace(array_keys($pairs), $pairs, $result);
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| 148 | }
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| 149 |
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| 150 | /// Print transformation if debug = on
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| 151 | if ($result != $sql && $this->debug) {
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| 152 | ADOConnection::outp("{$this->databaseType} internal transformation:<br>{$sql}<br>to<br>{$result}");
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| 153 | }
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| 154 |
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| 155 | return $result;
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| 156 | }
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| 157 | }
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| 158 |
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| 159 | class ADORecordset_mssql_n extends ADORecordset_mssql {
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| 160 | var $databaseType = "mssql_n";
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| 161 | function ADORecordset_mssql_n($id,$mode=false)
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| 162 | {
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| 163 | $this->ADORecordset_mssql($id,$mode);
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| 164 | }
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| 165 | }
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| 166 | ?> |
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