1: <?php
  2: /**
  3:  * SQLite layer for DBO
  4:  *
  5:  * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
  6:  * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
  7:  *
  8:  * Licensed under The MIT License
  9:  * For full copyright and license information, please see the LICENSE.txt
 10:  * Redistributions of files must retain the above copyright notice.
 11:  *
 12:  * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
 13:  * @link          http://cakephp.org CakePHP(tm) Project
 14:  * @package       Cake.Model.Datasource.Database
 15:  * @since         CakePHP(tm) v 0.9.0
 16:  * @license       http://www.opensource.org/licenses/mit-license.php MIT License
 17:  */
 18: 
 19: App::uses('DboSource', 'Model/Datasource');
 20: App::uses('CakeText', 'Utility');
 21: 
 22: /**
 23:  * DBO implementation for the SQLite3 DBMS.
 24:  *
 25:  * A DboSource adapter for SQLite 3 using PDO
 26:  *
 27:  * @package       Cake.Model.Datasource.Database
 28:  */
 29: class Sqlite extends DboSource {
 30: 
 31: /**
 32:  * Datasource Description
 33:  *
 34:  * @var string
 35:  */
 36:     public $description = "SQLite DBO Driver";
 37: 
 38: /**
 39:  * Quote Start
 40:  *
 41:  * @var string
 42:  */
 43:     public $startQuote = '"';
 44: 
 45: /**
 46:  * Quote End
 47:  *
 48:  * @var string
 49:  */
 50:     public $endQuote = '"';
 51: 
 52: /**
 53:  * Base configuration settings for SQLite3 driver
 54:  *
 55:  * @var array
 56:  */
 57:     protected $_baseConfig = array(
 58:         'persistent' => false,
 59:         'database' => null,
 60:         'flags' => array()
 61:     );
 62: 
 63: /**
 64:  * SQLite3 column definition
 65:  *
 66:  * @var array
 67:  */
 68:     public $columns = array(
 69:         'primary_key' => array('name' => 'integer primary key autoincrement'),
 70:         'string' => array('name' => 'varchar', 'limit' => '255'),
 71:         'text' => array('name' => 'text'),
 72:         'integer' => array('name' => 'integer', 'limit' => null, 'formatter' => 'intval'),
 73:         'biginteger' => array('name' => 'bigint', 'limit' => 20),
 74:         'float' => array('name' => 'float', 'formatter' => 'floatval'),
 75:         'decimal' => array('name' => 'decimal', 'formatter' => 'floatval'),
 76:         'datetime' => array('name' => 'datetime', 'format' => 'Y-m-d H:i:s', 'formatter' => 'date'),
 77:         'timestamp' => array('name' => 'timestamp', 'format' => 'Y-m-d H:i:s', 'formatter' => 'date'),
 78:         'time' => array('name' => 'time', 'format' => 'H:i:s', 'formatter' => 'date'),
 79:         'date' => array('name' => 'date', 'format' => 'Y-m-d', 'formatter' => 'date'),
 80:         'binary' => array('name' => 'blob'),
 81:         'boolean' => array('name' => 'boolean')
 82:     );
 83: 
 84: /**
 85:  * List of engine specific additional field parameters used on table creating
 86:  *
 87:  * @var array
 88:  */
 89:     public $fieldParameters = array(
 90:         'collate' => array(
 91:             'value' => 'COLLATE',
 92:             'quote' => false,
 93:             'join' => ' ',
 94:             'column' => 'Collate',
 95:             'position' => 'afterDefault',
 96:             'options' => array(
 97:                 'BINARY', 'NOCASE', 'RTRIM'
 98:             )
 99:         ),
100:     );
101: 
102: /**
103:  * Connects to the database using config['database'] as a filename.
104:  *
105:  * @return bool
106:  * @throws MissingConnectionException
107:  */
108:     public function connect() {
109:         $config = $this->config;
110:         $flags = $config['flags'] + array(
111:             PDO::ATTR_PERSISTENT => $config['persistent'],
112:             PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION
113:         );
114:         try {
115:             $this->_connection = new PDO('sqlite:' . $config['database'], null, null, $flags);
116:             $this->connected = true;
117:         } catch(PDOException $e) {
118:             throw new MissingConnectionException(array(
119:                 'class' => get_class($this),
120:                 'message' => $e->getMessage()
121:             ));
122:         }
123:         return $this->connected;
124:     }
125: 
126: /**
127:  * Check whether the SQLite extension is installed/loaded
128:  *
129:  * @return bool
130:  */
131:     public function enabled() {
132:         return in_array('sqlite', PDO::getAvailableDrivers());
133:     }
134: 
135: /**
136:  * Returns an array of tables in the database. If there are no tables, an error is raised and the application exits.
137:  *
138:  * @param mixed $data Unused.
139:  * @return array Array of table names in the database
140:  */
141:     public function listSources($data = null) {
142:         $cache = parent::listSources();
143:         if ($cache) {
144:             return $cache;
145:         }
146: 
147:         $result = $this->fetchAll("SELECT name FROM sqlite_master WHERE type='table' ORDER BY name;", false);
148: 
149:         if (!$result || empty($result)) {
150:             return array();
151:         }
152: 
153:         $tables = array();
154:         foreach ($result as $table) {
155:             $tables[] = $table[0]['name'];
156:         }
157:         parent::listSources($tables);
158:         return $tables;
159:     }
160: 
161: /**
162:  * Returns an array of the fields in given table name.
163:  *
164:  * @param Model|string $model Either the model or table name you want described.
165:  * @return array Fields in table. Keys are name and type
166:  */
167:     public function describe($model) {
168:         $table = $this->fullTableName($model, false, false);
169:         $cache = parent::describe($table);
170:         if ($cache) {
171:             return $cache;
172:         }
173:         $fields = array();
174:         $result = $this->_execute(
175:             'PRAGMA table_info(' . $this->value($table, 'string') . ')'
176:         );
177: 
178:         foreach ($result as $column) {
179:             $column = (array)$column;
180:             $default = ($column['dflt_value'] === 'NULL') ? null : trim($column['dflt_value'], "'");
181: 
182:             $fields[$column['name']] = array(
183:                 'type' => $this->column($column['type']),
184:                 'null' => !$column['notnull'],
185:                 'default' => $default,
186:                 'length' => $this->length($column['type'])
187:             );
188:             if ($column['pk'] == 1) {
189:                 $fields[$column['name']]['key'] = $this->index['PRI'];
190:                 $fields[$column['name']]['null'] = false;
191:                 if (empty($fields[$column['name']]['length'])) {
192:                     $fields[$column['name']]['length'] = 11;
193:                 }
194:             }
195:         }
196: 
197:         $result->closeCursor();
198:         $this->_cacheDescription($table, $fields);
199:         return $fields;
200:     }
201: 
202: /**
203:  * Generates and executes an SQL UPDATE statement for given model, fields, and values.
204:  *
205:  * @param Model $model The model instance to update.
206:  * @param array $fields The fields to update.
207:  * @param array $values The values to set columns to.
208:  * @param mixed $conditions array of conditions to use.
209:  * @return array
210:  */
211:     public function update(Model $model, $fields = array(), $values = null, $conditions = null) {
212:         if (empty($values) && !empty($fields)) {
213:             foreach ($fields as $field => $value) {
214:                 if (strpos($field, $model->alias . '.') !== false) {
215:                     unset($fields[$field]);
216:                     $field = str_replace($model->alias . '.', "", $field);
217:                     $field = str_replace($model->alias . '.', "", $field);
218:                     $fields[$field] = $value;
219:                 }
220:             }
221:         }
222:         return parent::update($model, $fields, $values, $conditions);
223:     }
224: 
225: /**
226:  * Deletes all the records in a table and resets the count of the auto-incrementing
227:  * primary key, where applicable.
228:  *
229:  * @param string|Model $table A string or model class representing the table to be truncated
230:  * @return bool SQL TRUNCATE TABLE statement, false if not applicable.
231:  */
232:     public function truncate($table) {
233:         if (in_array('sqlite_sequence', $this->listSources())) {
234:             $this->_execute('DELETE FROM sqlite_sequence where name=' . $this->startQuote . $this->fullTableName($table, false, false) . $this->endQuote);
235:         }
236:         return $this->execute('DELETE FROM ' . $this->fullTableName($table));
237:     }
238: 
239: /**
240:  * Converts database-layer column types to basic types
241:  *
242:  * @param string $real Real database-layer column type (i.e. "varchar(255)")
243:  * @return string Abstract column type (i.e. "string")
244:  */
245:     public function column($real) {
246:         if (is_array($real)) {
247:             $col = $real['name'];
248:             if (isset($real['limit'])) {
249:                 $col .= '(' . $real['limit'] . ')';
250:             }
251:             return $col;
252:         }
253: 
254:         $col = strtolower(str_replace(')', '', $real));
255:         if (strpos($col, '(') !== false) {
256:             list($col) = explode('(', $col);
257:         }
258: 
259:         $standard = array(
260:             'text',
261:             'integer',
262:             'float',
263:             'boolean',
264:             'timestamp',
265:             'date',
266:             'datetime',
267:             'time'
268:         );
269:         if (in_array($col, $standard)) {
270:             return $col;
271:         }
272:         if ($col === 'bigint') {
273:             return 'biginteger';
274:         }
275:         if (strpos($col, 'char') !== false) {
276:             return 'string';
277:         }
278:         if (in_array($col, array('blob', 'clob'))) {
279:             return 'binary';
280:         }
281:         if (strpos($col, 'numeric') !== false || strpos($col, 'decimal') !== false) {
282:             return 'decimal';
283:         }
284:         return 'text';
285:     }
286: 
287: /**
288:  * Generate ResultSet
289:  *
290:  * @param mixed $results The results to modify.
291:  * @return void
292:  */
293:     public function resultSet($results) {
294:         $this->results = $results;
295:         $this->map = array();
296:         $numFields = $results->columnCount();
297:         $index = 0;
298:         $j = 0;
299: 
300:         // PDO::getColumnMeta is experimental and does not work with sqlite3,
301:         // so try to figure it out based on the querystring
302:         $querystring = $results->queryString;
303:         if (stripos($querystring, 'SELECT') === 0 && stripos($querystring, 'FROM') > 0) {
304:             $selectpart = substr($querystring, 7);
305:             $selects = array();
306:             foreach (CakeText::tokenize($selectpart, ',', '(', ')') as $part) {
307:                 $fromPos = stripos($part, ' FROM ');
308:                 if ($fromPos !== false) {
309:                     $selects[] = trim(substr($part, 0, $fromPos));
310:                     break;
311:                 }
312:                 $selects[] = $part;
313:             }
314:         } elseif (strpos($querystring, 'PRAGMA table_info') === 0) {
315:             $selects = array('cid', 'name', 'type', 'notnull', 'dflt_value', 'pk');
316:         } elseif (strpos($querystring, 'PRAGMA index_list') === 0) {
317:             $selects = array('seq', 'name', 'unique');
318:         } elseif (strpos($querystring, 'PRAGMA index_info') === 0) {
319:             $selects = array('seqno', 'cid', 'name');
320:         }
321:         while ($j < $numFields) {
322:             if (!isset($selects[$j])) {
323:                 $j++;
324:                 continue;
325:             }
326:             if (preg_match('/\bAS(?!.*\bAS\b)\s+(.*)/i', $selects[$j], $matches)) {
327:                 $columnName = trim($matches[1], '"');
328:             } else {
329:                 $columnName = trim(str_replace('"', '', $selects[$j]));
330:             }
331: 
332:             if (strpos($selects[$j], 'DISTINCT') === 0) {
333:                 $columnName = str_ireplace('DISTINCT', '', $columnName);
334:             }
335: 
336:             $metaType = false;
337:             try {
338:                 $metaData = (array)$results->getColumnMeta($j);
339:                 if (!empty($metaData['sqlite:decl_type'])) {
340:                     $metaType = trim($metaData['sqlite:decl_type']);
341:                 }
342:             } catch (Exception $e) {
343:             }
344: 
345:             if (strpos($columnName, '.')) {
346:                 $parts = explode('.', $columnName);
347:                 $this->map[$index++] = array(trim($parts[0]), trim($parts[1]), $metaType);
348:             } else {
349:                 $this->map[$index++] = array(0, $columnName, $metaType);
350:             }
351:             $j++;
352:         }
353:     }
354: 
355: /**
356:  * Fetches the next row from the current result set
357:  *
358:  * @return mixed array with results fetched and mapped to column names or false if there is no results left to fetch
359:  */
360:     public function fetchResult() {
361:         if ($row = $this->_result->fetch(PDO::FETCH_NUM)) {
362:             $resultRow = array();
363:             foreach ($this->map as $col => $meta) {
364:                 list($table, $column, $type) = $meta;
365:                 $resultRow[$table][$column] = $row[$col];
366:                 if ($type === 'boolean' && $row[$col] !== null) {
367:                     $resultRow[$table][$column] = $this->boolean($resultRow[$table][$column]);
368:                 }
369:             }
370:             return $resultRow;
371:         }
372:         $this->_result->closeCursor();
373:         return false;
374:     }
375: 
376: /**
377:  * Returns a limit statement in the correct format for the particular database.
378:  *
379:  * @param int $limit Limit of results returned
380:  * @param int $offset Offset from which to start results
381:  * @return string SQL limit/offset statement
382:  */
383:     public function limit($limit, $offset = null) {
384:         if ($limit) {
385:             $rt = sprintf(' LIMIT %u', $limit);
386:             if ($offset) {
387:                 $rt .= sprintf(' OFFSET %u', $offset);
388:             }
389:             return $rt;
390:         }
391:         return null;
392:     }
393: 
394: /**
395:  * Generate a database-native column schema string
396:  *
397:  * @param array $column An array structured like the following: array('name'=>'value', 'type'=>'value'[, options]),
398:  *    where options can be 'default', 'length', or 'key'.
399:  * @return string
400:  */
401:     public function buildColumn($column) {
402:         $name = $type = null;
403:         $column += array('null' => true);
404:         extract($column);
405: 
406:         if (empty($name) || empty($type)) {
407:             trigger_error(__d('cake_dev', 'Column name or type not defined in schema'), E_USER_WARNING);
408:             return null;
409:         }
410: 
411:         if (!isset($this->columns[$type])) {
412:             trigger_error(__d('cake_dev', 'Column type %s does not exist', $type), E_USER_WARNING);
413:             return null;
414:         }
415: 
416:         $isPrimary = (isset($column['key']) && $column['key'] === 'primary');
417:         if ($isPrimary && $type === 'integer') {
418:             return $this->name($name) . ' ' . $this->columns['primary_key']['name'];
419:         }
420:         $out = parent::buildColumn($column);
421:         if ($isPrimary && $type === 'biginteger') {
422:             $replacement = 'PRIMARY KEY';
423:             if ($column['null'] === false) {
424:                 $replacement = 'NOT NULL ' . $replacement;
425:             }
426:             return str_replace($this->columns['primary_key']['name'], $replacement, $out);
427:         }
428:         return $out;
429:     }
430: 
431: /**
432:  * Sets the database encoding
433:  *
434:  * @param string $enc Database encoding
435:  * @return bool
436:  */
437:     public function setEncoding($enc) {
438:         if (!in_array($enc, array("UTF-8", "UTF-16", "UTF-16le", "UTF-16be"))) {
439:             return false;
440:         }
441:         return $this->_execute("PRAGMA encoding = \"{$enc}\"") !== false;
442:     }
443: 
444: /**
445:  * Gets the database encoding
446:  *
447:  * @return string The database encoding
448:  */
449:     public function getEncoding() {
450:         return $this->fetchRow('PRAGMA encoding');
451:     }
452: 
453: /**
454:  * Removes redundant primary key indexes, as they are handled in the column def of the key.
455:  *
456:  * @param array $indexes The indexes to build.
457:  * @param string $table The table name.
458:  * @return string The completed index.
459:  */
460:     public function buildIndex($indexes, $table = null) {
461:         $join = array();
462: 
463:         $table = str_replace('"', '', $table);
464:         list($dbname, $table) = explode('.', $table);
465:         $dbname = $this->name($dbname);
466: 
467:         foreach ($indexes as $name => $value) {
468: 
469:             if ($name === 'PRIMARY') {
470:                 continue;
471:             }
472:             $out = 'CREATE ';
473: 
474:             if (!empty($value['unique'])) {
475:                 $out .= 'UNIQUE ';
476:             }
477:             if (is_array($value['column'])) {
478:                 $value['column'] = implode(', ', array_map(array(&$this, 'name'), $value['column']));
479:             } else {
480:                 $value['column'] = $this->name($value['column']);
481:             }
482:             $t = trim($table, '"');
483:             $indexname = $this->name($t . '_' . $name);
484:             $table = $this->name($table);
485:             $out .= "INDEX {$dbname}.{$indexname} ON {$table}({$value['column']});";
486:             $join[] = $out;
487:         }
488:         return $join;
489:     }
490: 
491: /**
492:  * Overrides DboSource::index to handle SQLite index introspection
493:  * Returns an array of the indexes in given table name.
494:  *
495:  * @param string $model Name of model to inspect
496:  * @return array Fields in table. Keys are column and unique
497:  */
498:     public function index($model) {
499:         $index = array();
500:         $table = $this->fullTableName($model, false, false);
501:         if ($table) {
502:             $indexes = $this->query('PRAGMA index_list(' . $table . ')');
503: 
504:             if (is_bool($indexes)) {
505:                 return array();
506:             }
507:             foreach ($indexes as $info) {
508:                 $key = array_pop($info);
509:                 $keyInfo = $this->query('PRAGMA index_info("' . $key['name'] . '")');
510:                 foreach ($keyInfo as $keyCol) {
511:                     if (!isset($index[$key['name']])) {
512:                         $col = array();
513:                         if (preg_match('/autoindex/', $key['name'])) {
514:                             $key['name'] = 'PRIMARY';
515:                         }
516:                         $index[$key['name']]['column'] = $keyCol[0]['name'];
517:                         $index[$key['name']]['unique'] = (int)$key['unique'] === 1;
518:                     } else {
519:                         if (!is_array($index[$key['name']]['column'])) {
520:                             $col[] = $index[$key['name']]['column'];
521:                         }
522:                         $col[] = $keyCol[0]['name'];
523:                         $index[$key['name']]['column'] = $col;
524:                     }
525:                 }
526:             }
527:         }
528:         return $index;
529:     }
530: 
531: /**
532:  * Overrides DboSource::renderStatement to handle schema generation with SQLite-style indexes
533:  *
534:  * @param string $type The type of statement being rendered.
535:  * @param array $data The data to convert to SQL.
536:  * @return string
537:  */
538:     public function renderStatement($type, $data) {
539:         switch (strtolower($type)) {
540:             case 'schema':
541:                 extract($data);
542:                 if (is_array($columns)) {
543:                     $columns = "\t" . implode(",\n\t", array_filter($columns));
544:                 }
545:                 if (is_array($indexes)) {
546:                     $indexes = "\t" . implode("\n\t", array_filter($indexes));
547:                 }
548:                 return "CREATE TABLE {$table} (\n{$columns});\n{$indexes}";
549:             default:
550:                 return parent::renderStatement($type, $data);
551:         }
552:     }
553: 
554: /**
555:  * PDO deals in objects, not resources, so overload accordingly.
556:  *
557:  * @return bool
558:  */
559:     public function hasResult() {
560:         return is_object($this->_result);
561:     }
562: 
563: /**
564:  * Generate a "drop table" statement for the given table
565:  *
566:  * @param type $table Name of the table to drop
567:  * @return string Drop table SQL statement
568:  */
569:     protected function _dropTable($table) {
570:         return 'DROP TABLE IF EXISTS ' . $this->fullTableName($table) . ";";
571:     }
572: 
573: /**
574:  * Gets the schema name
575:  *
576:  * @return string The schema name
577:  */
578:     public function getSchemaName() {
579:         return "main"; // Sqlite Datasource does not support multidb
580:     }
581: 
582: /**
583:  * Check if the server support nested transactions
584:  *
585:  * @return bool
586:  */
587:     public function nestedTransactionSupported() {
588:         return $this->useNestedTransactions && version_compare($this->getVersion(), '3.6.8', '>=');
589:     }
590: 
591: }
592: