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- 06.01.2017
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mssql_odbc.php
001 <?php
002 /**
003 *
004 * This file is part of the phpBB Forum Software package.
005 *
006 * @copyright (c) phpBB Limited <https://www.phpbb.com>
007 * @license GNU General Public License, version 2 (GPL-2.0)
008 *
009 * For full copyright and license information, please see
010 * the docs/CREDITS.txt file.
011 *
012 */
013
014 namespace phpbb\db\driver;
015
016 /**
017 * Unified ODBC functions
018 * Unified ODBC functions support any database having ODBC driver, for example Adabas D, IBM DB2, iODBC, Solid, Sybase SQL Anywhere...
019 * Here we only support MSSQL Server 2000+ because of the provided schema
020 *
021 * @note number of bytes returned for returning data depends on odbc.defaultlrl php.ini setting.
022 * If it is limited to 4K for example only 4K of data is returned max, resulting in incomplete theme data for example.
023 * @note odbc.defaultbinmode may affect UTF8 characters
024 */
025 class mssql_odbc extends \phpbb\db\driver\mssql_base
026 {
027 var $last_query_text = '';
028 var $connect_error = '';
029
030 /**
031 * {@inheritDoc}
032 */
033 function sql_connect($sqlserver, $sqluser, $sqlpassword, $database, $port = false, $persistency = false, $new_link = false)
034 {
035 $this->persistency = $persistency;
036 $this->user = $sqluser;
037 $this->dbname = $database;
038
039 $port_delimiter = (defined('PHP_OS') && substr(PHP_OS, 0, 3) === 'WIN') ? ',' : ':';
040 $this->server = $sqlserver . (($port) ? $port_delimiter . $port : '');
041
042 $max_size = @ini_get('odbc.defaultlrl');
043 if (!empty($max_size))
044 {
045 $unit = strtolower(substr($max_size, -1, 1));
046 $max_size = (int) $max_size;
047
048 if ($unit == 'k')
049 {
050 $max_size = floor($max_size / 1024);
051 }
052 else if ($unit == 'g')
053 {
054 $max_size *= 1024;
055 }
056 else if (is_numeric($unit))
057 {
058 $max_size = floor((int) ($max_size . $unit) / 1048576);
059 }
060 $max_size = max(8, $max_size) . 'M';
061
062 @ini_set('odbc.defaultlrl', $max_size);
063 }
064
065 if ($this->persistency)
066 {
067 if (!function_exists('odbc_pconnect'))
068 {
069 $this->connect_error = 'odbc_pconnect function does not exist, is odbc extension installed?';
070 return $this->sql_error('');
071 }
072 $this->db_connect_id = @odbc_pconnect($this->server, $this->user, $sqlpassword);
073 }
074 else
075 {
076 if (!function_exists('odbc_connect'))
077 {
078 $this->connect_error = 'odbc_connect function does not exist, is odbc extension installed?';
079 return $this->sql_error('');
080 }
081 $this->db_connect_id = @odbc_connect($this->server, $this->user, $sqlpassword);
082 }
083
084 return ($this->db_connect_id) ? $this->db_connect_id : $this->sql_error('');
085 }
086
087 /**
088 * {@inheritDoc}
089 */
090 function sql_server_info($raw = false, $use_cache = true)
091 {
092 global $cache;
093
094 if (!$use_cache || empty($cache) || ($this->sql_server_version = $cache->get('mssqlodbc_version')) === false)
095 {
096 $result_id = @odbc_exec($this->db_connect_id, "SELECT SERVERPROPERTY('productversion'), SERVERPROPERTY('productlevel'), SERVERPROPERTY('edition')");
097
098 $row = false;
099 if ($result_id)
100 {
101 $row = odbc_fetch_array($result_id);
102 odbc_free_result($result_id);
103 }
104
105 $this->sql_server_version = ($row) ? trim(implode(' ', $row)) : 0;
106
107 if (!empty($cache) && $use_cache)
108 {
109 $cache->put('mssqlodbc_version', $this->sql_server_version);
110 }
111 }
112
113 if ($raw)
114 {
115 return $this->sql_server_version;
116 }
117
118 return ($this->sql_server_version) ? 'MSSQL (ODBC)<br />' . $this->sql_server_version : 'MSSQL (ODBC)';
119 }
120
121 /**
122 * SQL Transaction
123 * @access private
124 */
125 function _sql_transaction($status = 'begin')
126 {
127 switch ($status)
128 {
129 case 'begin':
130 return @odbc_exec($this->db_connect_id, 'BEGIN TRANSACTION');
131 break;
132
133 case 'commit':
134 return @odbc_exec($this->db_connect_id, 'COMMIT TRANSACTION');
135 break;
136
137 case 'rollback':
138 return @odbc_exec($this->db_connect_id, 'ROLLBACK TRANSACTION');
139 break;
140 }
141
142 return true;
143 }
144
145 /**
146 * {@inheritDoc}
147 */
148 function sql_query($query = '', $cache_ttl = 0)
149 {
150 if ($query != '')
151 {
152 global $cache;
153
154 // EXPLAIN only in extra debug mode
155 if (defined('DEBUG'))
156 {
157 $this->sql_report('start', $query);
158 }
159 else if (defined('PHPBB_DISPLAY_LOAD_TIME'))
160 {
161 $this->curtime = microtime(true);
162 }
163
164 $this->last_query_text = $query;
165 $this->query_result = ($cache && $cache_ttl) ? $cache->sql_load($query) : false;
166 $this->sql_add_num_queries($this->query_result);
167
168 if ($this->query_result === false)
169 {
170 if (($this->query_result = @odbc_exec($this->db_connect_id, $query)) === false)
171 {
172 $this->sql_error($query);
173 }
174
175 if (defined('DEBUG'))
176 {
177 $this->sql_report('stop', $query);
178 }
179 else if (defined('PHPBB_DISPLAY_LOAD_TIME'))
180 {
181 $this->sql_time += microtime(true) - $this->curtime;
182 }
183
184 if (!$this->query_result)
185 {
186 return false;
187 }
188
189 if ($cache && $cache_ttl)
190 {
191 $this->open_queries[(int) $this->query_result] = $this->query_result;
192 $this->query_result = $cache->sql_save($this, $query, $this->query_result, $cache_ttl);
193 }
194 else if (strpos($query, 'SELECT') === 0)
195 {
196 $this->open_queries[(int) $this->query_result] = $this->query_result;
197 }
198 }
199 else if (defined('DEBUG'))
200 {
201 $this->sql_report('fromcache', $query);
202 }
203 }
204 else
205 {
206 return false;
207 }
208
209 return $this->query_result;
210 }
211
212 /**
213 * Build LIMIT query
214 */
215 function _sql_query_limit($query, $total, $offset = 0, $cache_ttl = 0)
216 {
217 $this->query_result = false;
218
219 // Since TOP is only returning a set number of rows we won't need it if total is set to 0 (return all rows)
220 if ($total)
221 {
222 // We need to grab the total number of rows + the offset number of rows to get the correct result
223 if (strpos($query, 'SELECT DISTINCT') === 0)
224 {
225 $query = 'SELECT DISTINCT TOP ' . ($total + $offset) . ' ' . substr($query, 15);
226 }
227 else
228 {
229 $query = 'SELECT TOP ' . ($total + $offset) . ' ' . substr($query, 6);
230 }
231 }
232
233 $result = $this->sql_query($query, $cache_ttl);
234
235 // Seek by $offset rows
236 if ($offset)
237 {
238 $this->sql_rowseek($offset, $result);
239 }
240
241 return $result;
242 }
243
244 /**
245 * {@inheritDoc}
246 */
247 function sql_affectedrows()
248 {
249 return ($this->db_connect_id) ? @odbc_num_rows($this->query_result) : false;
250 }
251
252 /**
253 * {@inheritDoc}
254 */
255 function sql_fetchrow($query_id = false)
256 {
257 global $cache;
258
259 if ($query_id === false)
260 {
261 $query_id = $this->query_result;
262 }
263
264 if ($cache && $cache->sql_exists($query_id))
265 {
266 return $cache->sql_fetchrow($query_id);
267 }
268
269 return ($query_id) ? odbc_fetch_array($query_id) : false;
270 }
271
272 /**
273 * {@inheritDoc}
274 */
275 function sql_nextid()
276 {
277 $result_id = @odbc_exec($this->db_connect_id, 'SELECT @@IDENTITY');
278
279 if ($result_id)
280 {
281 if (odbc_fetch_array($result_id))
282 {
283 $id = odbc_result($result_id, 1);
284 odbc_free_result($result_id);
285 return $id;
286 }
287 odbc_free_result($result_id);
288 }
289
290 return false;
291 }
292
293 /**
294 * {@inheritDoc}
295 */
296 function sql_freeresult($query_id = false)
297 {
298 global $cache;
299
300 if ($query_id === false)
301 {
302 $query_id = $this->query_result;
303 }
304
305 if ($cache && !is_object($query_id) && $cache->sql_exists($query_id))
306 {
307 return $cache->sql_freeresult($query_id);
308 }
309
310 if (isset($this->open_queries[(int) $query_id]))
311 {
312 unset($this->open_queries[(int) $query_id]);
313 return odbc_free_result($query_id);
314 }
315
316 return false;
317 }
318
319 /**
320 * return sql error array
321 * @access private
322 */
323 function _sql_error()
324 {
325 if (function_exists('odbc_errormsg'))
326 {
327 $error = array(
328 'message' => @odbc_errormsg(),
329 'code' => @odbc_error(),
330 );
331 }
332 else
333 {
334 $error = array(
335 'message' => $this->connect_error,
336 'code' => '',
337 );
338 }
339
340 return $error;
341 }
342
343 /**
344 * Close sql connection
345 * @access private
346 */
347 function _sql_close()
348 {
349 return @odbc_close($this->db_connect_id);
350 }
351
352 /**
353 * Build db-specific report
354 * @access private
355 */
356 function _sql_report($mode, $query = '')
357 {
358 switch ($mode)
359 {
360 case 'start':
361 break;
362
363 case 'fromcache':
364 $endtime = explode(' ', microtime());
365 $endtime = $endtime[0] + $endtime[1];
366
367 $result = @odbc_exec($this->db_connect_id, $query);
368 if ($result)
369 {
370 while ($void = odbc_fetch_array($result))
371 {
372 // Take the time spent on parsing rows into account
373 }
374 odbc_free_result($result);
375 }
376
377 $splittime = explode(' ', microtime());
378 $splittime = $splittime[0] + $splittime[1];
379
380 $this->sql_report('record_fromcache', $query, $endtime, $splittime);
381
382 break;
383 }
384 }
385 }
386