Rev Author Line No. Line
130 kaklik 1 <?php
2 /***************************************************************************
3 * sql_parse.php
4 * -------------------
5 * begin : Thu May 31, 2001
6 * copyright : (C) 2001 The phpBB Group
7 * email : support@phpbb.com
8 *
9 * $Id: sql_parse.php,v 1.8 2002/03/18 23:53:12 psotfx Exp $
10 *
11 ****************************************************************************/
12  
13 /***************************************************************************
14 *
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation; either version 2 of the License, or
18 * (at your option) any later version.
19 *
20 ***************************************************************************/
21  
22 /***************************************************************************
23 *
24 * These functions are mainly for use in the db_utilities under the admin
25 * however in order to make these functions available elsewhere, specifically
26 * in the installation phase of phpBB I have seperated out a couple of
27 * functions into this file. JLH
28 *
29 \***************************************************************************/
30  
31 //
32 // remove_comments will strip the sql comment lines out of an uploaded sql file
33 // specifically for mssql and postgres type files in the install....
34 //
35 function remove_comments(&$output)
36 {
37 $lines = explode("\n", $output);
38 $output = "";
39  
40 // try to keep mem. use down
41 $linecount = count($lines);
42  
43 $in_comment = false;
44 for($i = 0; $i < $linecount; $i++)
45 {
46 if( preg_match("/^\/\*/", preg_quote($lines[$i])) )
47 {
48 $in_comment = true;
49 }
50  
51 if( !$in_comment )
52 {
53 $output .= $lines[$i] . "\n";
54 }
55  
56 if( preg_match("/\*\/$/", preg_quote($lines[$i])) )
57 {
58 $in_comment = false;
59 }
60 }
61  
62 unset($lines);
63 return $output;
64 }
65  
66 //
67 // remove_remarks will strip the sql comment lines out of an uploaded sql file
68 //
69 function remove_remarks($sql)
70 {
71 $lines = explode("\n", $sql);
72  
73 // try to keep mem. use down
74 $sql = "";
75  
76 $linecount = count($lines);
77 $output = "";
78  
79 for ($i = 0; $i < $linecount; $i++)
80 {
81 if (($i != ($linecount - 1)) || (strlen($lines[$i]) > 0))
82 {
83 if ($lines[$i][0] != "#")
84 {
85 $output .= $lines[$i] . "\n";
86 }
87 else
88 {
89 $output .= "\n";
90 }
91 // Trading a bit of speed for lower mem. use here.
92 $lines[$i] = "";
93 }
94 }
95  
96 return $output;
97  
98 }
99  
100 //
101 // split_sql_file will split an uploaded sql file into single sql statements.
102 // Note: expects trim() to have already been run on $sql.
103 //
104 function split_sql_file($sql, $delimiter)
105 {
106 // Split up our string into "possible" SQL statements.
107 $tokens = explode($delimiter, $sql);
108  
109 // try to save mem.
110 $sql = "";
111 $output = array();
112  
113 // we don't actually care about the matches preg gives us.
114 $matches = array();
115  
116 // this is faster than calling count($oktens) every time thru the loop.
117 $token_count = count($tokens);
118 for ($i = 0; $i < $token_count; $i++)
119 {
120 // Don't wanna add an empty string as the last thing in the array.
121 if (($i != ($token_count - 1)) || (strlen($tokens[$i] > 0)))
122 {
123 // This is the total number of single quotes in the token.
124 $total_quotes = preg_match_all("/'/", $tokens[$i], $matches);
125 // Counts single quotes that are preceded by an odd number of backslashes,
126 // which means they're escaped quotes.
127 $escaped_quotes = preg_match_all("/(?<!\\\\)(\\\\\\\\)*\\\\'/", $tokens[$i], $matches);
128  
129 $unescaped_quotes = $total_quotes - $escaped_quotes;
130  
131 // If the number of unescaped quotes is even, then the delimiter did NOT occur inside a string literal.
132 if (($unescaped_quotes % 2) == 0)
133 {
134 // It's a complete sql statement.
135 $output[] = $tokens[$i];
136 // save memory.
137 $tokens[$i] = "";
138 }
139 else
140 {
141 // incomplete sql statement. keep adding tokens until we have a complete one.
142 // $temp will hold what we have so far.
143 $temp = $tokens[$i] . $delimiter;
144 // save memory..
145 $tokens[$i] = "";
146  
147 // Do we have a complete statement yet?
148 $complete_stmt = false;
149  
150 for ($j = $i + 1; (!$complete_stmt && ($j < $token_count)); $j++)
151 {
152 // This is the total number of single quotes in the token.
153 $total_quotes = preg_match_all("/'/", $tokens[$j], $matches);
154 // Counts single quotes that are preceded by an odd number of backslashes,
155 // which means they're escaped quotes.
156 $escaped_quotes = preg_match_all("/(?<!\\\\)(\\\\\\\\)*\\\\'/", $tokens[$j], $matches);
157  
158 $unescaped_quotes = $total_quotes - $escaped_quotes;
159  
160 if (($unescaped_quotes % 2) == 1)
161 {
162 // odd number of unescaped quotes. In combination with the previous incomplete
163 // statement(s), we now have a complete statement. (2 odds always make an even)
164 $output[] = $temp . $tokens[$j];
165  
166 // save memory.
167 $tokens[$j] = "";
168 $temp = "";
169  
170 // exit the loop.
171 $complete_stmt = true;
172 // make sure the outer loop continues at the right point.
173 $i = $j;
174 }
175 else
176 {
177 // even number of unescaped quotes. We still don't have a complete statement.
178 // (1 odd and 1 even always make an odd)
179 $temp .= $tokens[$j] . $delimiter;
180 // save memory.
181 $tokens[$j] = "";
182 }
183  
184 } // for..
185 } // else
186 }
187 }
188  
189 return $output;
190 }
191  
192 ?>