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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 $cache;
153
154 if ($this->debug_sql_explain)
155 {
156 $this->sql_report('start', $query);
157 }
158 else if ($this->debug_load_time)
159 {
160 $this->curtime = microtime(true);
161 }
162
163 $this->last_query_text = $query;
164 $this->query_result = ($cache && $cache_ttl) ? $cache->sql_load($query) : false;
165 $this->sql_add_num_queries($this->query_result);
166
167 if ($this->query_result === false)
168 {
169 try
170 {
171 $this->query_result = @odbc_exec($this->db_connect_id, $query);
172 }
173 catch (\Error $e)
174 {
175 // Do nothing as SQL driver will report the error
176 }
177
178 if ($this->query_result === false)
179 {
180 $this->sql_error($query);
181 }
182
183 if ($this->debug_sql_explain)
184 {
185 $this->sql_report('stop', $query);
186 }
187 else if ($this->debug_load_time)
188 {
189 $this->sql_time += microtime(true) - $this->curtime;
190 }
191
192 if (!$this->query_result)
193 {
194 return false;
195 }
196
197 $safe_query_id = $this->clean_query_id($this->query_result);
198
199 if ($cache && $cache_ttl)
200 {
201 $this->open_queries[$safe_query_id] = $this->query_result;
202 $this->query_result = $cache->sql_save($this, $query, $this->query_result, $cache_ttl);
203 }
204 else if (strpos($query, 'SELECT') === 0)
205 {
206 $this->open_queries[$safe_query_id] = $this->query_result;
207 }
208 }
209 else if ($this->debug_sql_explain)
210 {
211 $this->sql_report('fromcache', $query);
212 }
213 }
214 else
215 {
216 return false;
217 }
218
219 return $this->query_result;
220 }
221
222 /**
223 * Build LIMIT query
224 */
225 function _sql_query_limit($query, $total, $offset = 0, $cache_ttl = 0)
226 {
227 $this->query_result = false;
228
229 // Since TOP is only returning a set number of rows we won't need it if total is set to 0 (return all rows)
230 if ($total)
231 {
232 // We need to grab the total number of rows + the offset number of rows to get the correct result
233 if (strpos($query, 'SELECT DISTINCT') === 0)
234 {
235 $query = 'SELECT DISTINCT TOP ' . ($total + $offset) . ' ' . substr($query, 15);
236 }
237 else
238 {
239 $query = 'SELECT TOP ' . ($total + $offset) . ' ' . substr($query, 6);
240 }
241 }
242
243 $result = $this->sql_query($query, $cache_ttl);
244
245 // Seek by $offset rows
246 if ($offset)
247 {
248 $this->sql_rowseek($offset, $result);
249 }
250
251 return $result;
252 }
253
254 /**
255 * {@inheritDoc}
256 */
257 function sql_affectedrows()
258 {
259 return ($this->db_connect_id) ? @odbc_num_rows($this->query_result) : false;
260 }
261
262 /**
263 * {@inheritDoc}
264 */
265 function sql_fetchrow($query_id = false)
266 {
267 global $cache;
268
269 if ($query_id === false)
270 {
271 $query_id = $this->query_result;
272 }
273
274 $safe_query_id = $this->clean_query_id($query_id);
275 if ($cache && $cache->sql_exists($safe_query_id))
276 {
277 return $cache->sql_fetchrow($safe_query_id);
278 }
279
280 return ($query_id) ? odbc_fetch_array($query_id) : false;
281 }
282
283 /**
284 * {@inheritdoc}
285 */
286 public function sql_last_inserted_id()
287 {
288 $result_id = @odbc_exec($this->db_connect_id, 'SELECT @@IDENTITY');
289
290 if ($result_id)
291 {
292 if (odbc_fetch_array($result_id))
293 {
294 $id = odbc_result($result_id, 1);
295 odbc_free_result($result_id);
296 return $id;
297 }
298 odbc_free_result($result_id);
299 }
300
301 return false;
302 }
303
304 /**
305 * {@inheritDoc}
306 */
307 function sql_freeresult($query_id = false)
308 {
309 global $cache;
310
311 if ($query_id === false)
312 {
313 $query_id = $this->query_result;
314 }
315
316 $safe_query_id = $this->clean_query_id($query_id);
317 if ($cache && $cache->sql_exists($safe_query_id))
318 {
319 return $cache->sql_freeresult($safe_query_id);
320 }
321
322 if (isset($this->open_queries[$safe_query_id]))
323 {
324 unset($this->open_queries[$safe_query_id]);
325 return odbc_free_result($query_id);
326 }
327
328 return false;
329 }
330
331 /**
332 * return sql error array
333 * @access private
334 */
335 function _sql_error()
336 {
337 if (function_exists('odbc_errormsg'))
338 {
339 $error = array(
340 'message' => @odbc_errormsg(),
341 'code' => @odbc_error(),
342 );
343 }
344 else
345 {
346 $error = array(
347 'message' => $this->connect_error,
348 'code' => '',
349 );
350 }
351
352 return $error;
353 }
354
355 /**
356 * Close sql connection
357 * @access private
358 */
359 function _sql_close()
360 {
361 return @odbc_close($this->db_connect_id);
362 }
363
364 /**
365 * Build db-specific report
366 * @access private
367 */
368 function _sql_report($mode, $query = '')
369 {
370 switch ($mode)
371 {
372 case 'start':
373 break;
374
375 case 'fromcache':
376 $endtime = explode(' ', microtime());
377 $endtime = $endtime[0] + $endtime[1];
378
379 $result = @odbc_exec($this->db_connect_id, $query);
380 if ($result)
381 {
382 while ($void = odbc_fetch_array($result))
383 {
384 // Take the time spent on parsing rows into account
385 }
386 odbc_free_result($result);
387 }
388
389 $splittime = explode(' ', microtime());
390 $splittime = $splittime[0] + $splittime[1];
391
392 $this->sql_report('record_fromcache', $query, $endtime, $splittime);
393
394 break;
395 }
396 }
397 }
398