source: branches/comu-ver2/data/module/adodb/drivers/adodb-mssql_n.inc.php @ 18701

Revision 18701, 7.1 KB checked in by nanasess, 14 years ago (diff)

Copyright の更新(#601)

  • Property svn:eol-style set to LF
  • Property svn:keywords set to Id Revision Date
  • Property svn:mime-type set to text/x-httpd-php
Line 
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) 2000-2010 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
46if (!defined('ADODB_DIR')) die();
47
48// one useful constant
49if (!defined('SINGLEQUOTE')) define('SINGLEQUOTE', "'");
50
51include_once(ADODB_DIR.'/drivers/adodb-mssql.inc.php');
52
53class 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
164class 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}
171?>
Note: See TracBrowser for help on using the repository browser.