1: <?php
  2: /**
  3:  * MySQL layer for DBO
  4:  *
  5:  * PHP 5
  6:  *
  7:  * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
  8:  * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
  9:  *
 10:  * Licensed under The MIT License
 11:  * For full copyright and license information, please see the LICENSE.txt
 12:  * Redistributions of files must retain the above copyright notice.
 13:  *
 14:  * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
 15:  * @link          http://cakephp.org CakePHP(tm) Project
 16:  * @package       Cake.Model.Datasource.Database
 17:  * @since         CakePHP(tm) v 0.10.5.1790
 18:  * @license       http://www.opensource.org/licenses/mit-license.php MIT License
 19:  */
 20: 
 21: App::uses('DboSource', 'Model/Datasource');
 22: 
 23: /**
 24:  * MySQL DBO driver object
 25:  *
 26:  * Provides connection and SQL generation for MySQL RDMS
 27:  *
 28:  * @package       Cake.Model.Datasource.Database
 29:  */
 30: class Mysql extends DboSource {
 31: 
 32: /**
 33:  * Datasource description
 34:  *
 35:  * @var string
 36:  */
 37:     public $description = "MySQL DBO Driver";
 38: 
 39: /**
 40:  * Base configuration settings for MySQL driver
 41:  *
 42:  * @var array
 43:  */
 44:     protected $_baseConfig = array(
 45:         'persistent' => true,
 46:         'host' => 'localhost',
 47:         'login' => 'root',
 48:         'password' => '',
 49:         'database' => 'cake',
 50:         'port' => '3306'
 51:     );
 52: 
 53: /**
 54:  * Reference to the PDO object connection
 55:  *
 56:  * @var PDO $_connection
 57:  */
 58:     protected $_connection = null;
 59: 
 60: /**
 61:  * Start quote
 62:  *
 63:  * @var string
 64:  */
 65:     public $startQuote = "`";
 66: 
 67: /**
 68:  * End quote
 69:  *
 70:  * @var string
 71:  */
 72:     public $endQuote = "`";
 73: 
 74: /**
 75:  * use alias for update and delete. Set to true if version >= 4.1
 76:  *
 77:  * @var boolean
 78:  */
 79:     protected $_useAlias = true;
 80: 
 81: /**
 82:  * List of engine specific additional field parameters used on table creating
 83:  *
 84:  * @var array
 85:  */
 86:     public $fieldParameters = array(
 87:         'charset' => array('value' => 'CHARACTER SET', 'quote' => false, 'join' => ' ', 'column' => false, 'position' => 'beforeDefault'),
 88:         'collate' => array('value' => 'COLLATE', 'quote' => false, 'join' => ' ', 'column' => 'Collation', 'position' => 'beforeDefault'),
 89:         'comment' => array('value' => 'COMMENT', 'quote' => true, 'join' => ' ', 'column' => 'Comment', 'position' => 'afterDefault')
 90:     );
 91: 
 92: /**
 93:  * List of table engine specific parameters used on table creating
 94:  *
 95:  * @var array
 96:  */
 97:     public $tableParameters = array(
 98:         'charset' => array('value' => 'DEFAULT CHARSET', 'quote' => false, 'join' => '=', 'column' => 'charset'),
 99:         'collate' => array('value' => 'COLLATE', 'quote' => false, 'join' => '=', 'column' => 'Collation'),
100:         'engine' => array('value' => 'ENGINE', 'quote' => false, 'join' => '=', 'column' => 'Engine')
101:     );
102: 
103: /**
104:  * MySQL column definition
105:  *
106:  * @var array
107:  */
108:     public $columns = array(
109:         'primary_key' => array('name' => 'NOT NULL AUTO_INCREMENT'),
110:         'string' => array('name' => 'varchar', 'limit' => '255'),
111:         'text' => array('name' => 'text'),
112:         'biginteger' => array('name' => 'bigint', 'limit' => '20'),
113:         'integer' => array('name' => 'int', 'limit' => '11', 'formatter' => 'intval'),
114:         'float' => array('name' => 'float', 'formatter' => 'floatval'),
115:         'datetime' => array('name' => 'datetime', 'format' => 'Y-m-d H:i:s', 'formatter' => 'date'),
116:         'timestamp' => array('name' => 'timestamp', 'format' => 'Y-m-d H:i:s', 'formatter' => 'date'),
117:         'time' => array('name' => 'time', 'format' => 'H:i:s', 'formatter' => 'date'),
118:         'date' => array('name' => 'date', 'format' => 'Y-m-d', 'formatter' => 'date'),
119:         'binary' => array('name' => 'blob'),
120:         'boolean' => array('name' => 'tinyint', 'limit' => '1')
121:     );
122: 
123: /**
124:  * Mapping of collation names to character set names
125:  *
126:  * @var array
127:  */
128:     protected $_charsets = array();
129: 
130: /**
131:  * Connects to the database using options in the given configuration array.
132:  *
133:  * @return boolean True if the database could be connected, else false
134:  * @throws MissingConnectionException
135:  */
136:     public function connect() {
137:         $config = $this->config;
138:         $this->connected = false;
139: 
140:         $flags = array(
141:             PDO::ATTR_PERSISTENT => $config['persistent'],
142:             PDO::MYSQL_ATTR_USE_BUFFERED_QUERY => true,
143:             PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION
144:         );
145: 
146:         if (!empty($config['encoding'])) {
147:             $flags[PDO::MYSQL_ATTR_INIT_COMMAND] = 'SET NAMES ' . $config['encoding'];
148:         }
149: 
150:         if (empty($config['unix_socket'])) {
151:             $dsn = "mysql:host={$config['host']};port={$config['port']};dbname={$config['database']}";
152:         } else {
153:             $dsn = "mysql:unix_socket={$config['unix_socket']};dbname={$config['database']}";
154:         }
155: 
156:         try {
157:             $this->_connection = new PDO(
158:                 $dsn,
159:                 $config['login'],
160:                 $config['password'],
161:                 $flags
162:             );
163:             $this->connected = true;
164:         } catch (PDOException $e) {
165:             throw new MissingConnectionException(array(
166:                 'class' => get_class($this),
167:                 'message' => $e->getMessage()
168:             ));
169:         }
170: 
171:         $this->_charsets = array();
172:         $this->_useAlias = (bool)version_compare($this->getVersion(), "4.1", ">=");
173: 
174:         return $this->connected;
175:     }
176: 
177: /**
178:  * Check whether the MySQL extension is installed/loaded
179:  *
180:  * @return boolean
181:  */
182:     public function enabled() {
183:         return in_array('mysql', PDO::getAvailableDrivers());
184:     }
185: 
186: /**
187:  * Returns an array of sources (tables) in the database.
188:  *
189:  * @param mixed $data
190:  * @return array Array of table names in the database
191:  */
192:     public function listSources($data = null) {
193:         $cache = parent::listSources();
194:         if ($cache) {
195:             return $cache;
196:         }
197:         $result = $this->_execute('SHOW TABLES FROM ' . $this->name($this->config['database']));
198: 
199:         if (!$result) {
200:             $result->closeCursor();
201:             return array();
202:         }
203:         $tables = array();
204: 
205:         while ($line = $result->fetch(PDO::FETCH_NUM)) {
206:             $tables[] = $line[0];
207:         }
208: 
209:         $result->closeCursor();
210:         parent::listSources($tables);
211:         return $tables;
212:     }
213: 
214: /**
215:  * Builds a map of the columns contained in a result
216:  *
217:  * @param PDOStatement $results
218:  * @return void
219:  */
220:     public function resultSet($results) {
221:         $this->map = array();
222:         $numFields = $results->columnCount();
223:         $index = 0;
224: 
225:         while ($numFields-- > 0) {
226:             $column = $results->getColumnMeta($index);
227:             if ($column['len'] === 1 && (empty($column['native_type']) || $column['native_type'] === 'TINY')) {
228:                 $type = 'boolean';
229:             } else {
230:                 $type = empty($column['native_type']) ? 'string' : $column['native_type'];
231:             }
232:             if (!empty($column['table']) && strpos($column['name'], $this->virtualFieldSeparator) === false) {
233:                 $this->map[$index++] = array($column['table'], $column['name'], $type);
234:             } else {
235:                 $this->map[$index++] = array(0, $column['name'], $type);
236:             }
237:         }
238:     }
239: 
240: /**
241:  * Fetches the next row from the current result set
242:  *
243:  * @return mixed array with results fetched and mapped to column names or false if there is no results left to fetch
244:  */
245:     public function fetchResult() {
246:         if ($row = $this->_result->fetch(PDO::FETCH_NUM)) {
247:             $resultRow = array();
248:             foreach ($this->map as $col => $meta) {
249:                 list($table, $column, $type) = $meta;
250:                 $resultRow[$table][$column] = $row[$col];
251:                 if ($type === 'boolean' && $row[$col] !== null) {
252:                     $resultRow[$table][$column] = $this->boolean($resultRow[$table][$column]);
253:                 }
254:             }
255:             return $resultRow;
256:         }
257:         $this->_result->closeCursor();
258:         return false;
259:     }
260: 
261: /**
262:  * Gets the database encoding
263:  *
264:  * @return string The database encoding
265:  */
266:     public function getEncoding() {
267:         return $this->_execute('SHOW VARIABLES LIKE ?', array('character_set_client'))->fetchObject()->Value;
268:     }
269: 
270: /**
271:  * Query charset by collation
272:  *
273:  * @param string $name Collation name
274:  * @return string Character set name
275:  */
276:     public function getCharsetName($name) {
277:         if ((bool)version_compare($this->getVersion(), "5", "<")) {
278:             return false;
279:         }
280:         if (isset($this->_charsets[$name])) {
281:             return $this->_charsets[$name];
282:         }
283:         $r = $this->_execute(
284:             'SELECT CHARACTER_SET_NAME FROM INFORMATION_SCHEMA.COLLATIONS WHERE COLLATION_NAME = ?',
285:             array($name)
286:         );
287:         $cols = $r->fetch(PDO::FETCH_ASSOC);
288: 
289:         if (isset($cols['CHARACTER_SET_NAME'])) {
290:             $this->_charsets[$name] = $cols['CHARACTER_SET_NAME'];
291:         } else {
292:             $this->_charsets[$name] = false;
293:         }
294:         return $this->_charsets[$name];
295:     }
296: 
297: /**
298:  * Returns an array of the fields in given table name.
299:  *
300:  * @param Model|string $model Name of database table to inspect or model instance
301:  * @return array Fields in table. Keys are name and type
302:  * @throws CakeException
303:  */
304:     public function describe($model) {
305:         $key = $this->fullTableName($model, false);
306:         $cache = parent::describe($key);
307:         if ($cache) {
308:             return $cache;
309:         }
310:         $table = $this->fullTableName($model);
311: 
312:         $fields = false;
313:         $cols = $this->_execute('SHOW FULL COLUMNS FROM ' . $table);
314:         if (!$cols) {
315:             throw new CakeException(__d('cake_dev', 'Could not describe table for %s', $table));
316:         }
317: 
318:         while ($column = $cols->fetch(PDO::FETCH_OBJ)) {
319:             $fields[$column->Field] = array(
320:                 'type' => $this->column($column->Type),
321:                 'null' => ($column->Null === 'YES' ? true : false),
322:                 'default' => $column->Default,
323:                 'length' => $this->length($column->Type),
324:             );
325:             if (!empty($column->Key) && isset($this->index[$column->Key])) {
326:                 $fields[$column->Field]['key'] = $this->index[$column->Key];
327:             }
328:             foreach ($this->fieldParameters as $name => $value) {
329:                 if (!empty($column->{$value['column']})) {
330:                     $fields[$column->Field][$name] = $column->{$value['column']};
331:                 }
332:             }
333:             if (isset($fields[$column->Field]['collate'])) {
334:                 $charset = $this->getCharsetName($fields[$column->Field]['collate']);
335:                 if ($charset) {
336:                     $fields[$column->Field]['charset'] = $charset;
337:                 }
338:             }
339:         }
340:         $this->_cacheDescription($key, $fields);
341:         $cols->closeCursor();
342:         return $fields;
343:     }
344: 
345: /**
346:  * Generates and executes an SQL UPDATE statement for given model, fields, and values.
347:  *
348:  * @param Model $model
349:  * @param array $fields
350:  * @param array $values
351:  * @param mixed $conditions
352:  * @return array
353:  */
354:     public function update(Model $model, $fields = array(), $values = null, $conditions = null) {
355:         if (!$this->_useAlias) {
356:             return parent::update($model, $fields, $values, $conditions);
357:         }
358: 
359:         if (!$values) {
360:             $combined = $fields;
361:         } else {
362:             $combined = array_combine($fields, $values);
363:         }
364: 
365:         $alias = $joins = false;
366:         $fields = $this->_prepareUpdateFields($model, $combined, empty($conditions), !empty($conditions));
367:         $fields = implode(', ', $fields);
368:         $table = $this->fullTableName($model);
369: 
370:         if (!empty($conditions)) {
371:             $alias = $this->name($model->alias);
372:             if ($model->name == $model->alias) {
373:                 $joins = implode(' ', $this->_getJoins($model));
374:             }
375:         }
376:         $conditions = $this->conditions($this->defaultConditions($model, $conditions, $alias), true, true, $model);
377: 
378:         if ($conditions === false) {
379:             return false;
380:         }
381: 
382:         if (!$this->execute($this->renderStatement('update', compact('table', 'alias', 'joins', 'fields', 'conditions')))) {
383:             $model->onError();
384:             return false;
385:         }
386:         return true;
387:     }
388: 
389: /**
390:  * Generates and executes an SQL DELETE statement for given id/conditions on given model.
391:  *
392:  * @param Model $model
393:  * @param mixed $conditions
394:  * @return boolean Success
395:  */
396:     public function delete(Model $model, $conditions = null) {
397:         if (!$this->_useAlias) {
398:             return parent::delete($model, $conditions);
399:         }
400:         $alias = $this->name($model->alias);
401:         $table = $this->fullTableName($model);
402:         $joins = implode(' ', $this->_getJoins($model));
403: 
404:         if (empty($conditions)) {
405:             $alias = $joins = false;
406:         }
407:         $complexConditions = false;
408:         foreach ((array)$conditions as $key => $value) {
409:             if (strpos($key, $model->alias) === false) {
410:                 $complexConditions = true;
411:                 break;
412:             }
413:         }
414:         if (!$complexConditions) {
415:             $joins = false;
416:         }
417: 
418:         $conditions = $this->conditions($this->defaultConditions($model, $conditions, $alias), true, true, $model);
419:         if ($conditions === false) {
420:             return false;
421:         }
422:         if ($this->execute($this->renderStatement('delete', compact('alias', 'table', 'joins', 'conditions'))) === false) {
423:             $model->onError();
424:             return false;
425:         }
426:         return true;
427:     }
428: 
429: /**
430:  * Sets the database encoding
431:  *
432:  * @param string $enc Database encoding
433:  * @return boolean
434:  */
435:     public function setEncoding($enc) {
436:         return $this->_execute('SET NAMES ' . $enc) !== false;
437:     }
438: 
439: /**
440:  * Returns an array of the indexes in given datasource name.
441:  *
442:  * @param string $model Name of model to inspect
443:  * @return array Fields in table. Keys are column and unique
444:  */
445:     public function index($model) {
446:         $index = array();
447:         $table = $this->fullTableName($model);
448:         $old = version_compare($this->getVersion(), '4.1', '<=');
449:         if ($table) {
450:             $indexes = $this->_execute('SHOW INDEX FROM ' . $table);
451:             // @codingStandardsIgnoreStart
452:             // MySQL columns don't match the cakephp conventions.
453:             while ($idx = $indexes->fetch(PDO::FETCH_OBJ)) {
454:                 if ($old) {
455:                     $idx = (object)current((array)$idx);
456:                 }
457:                 if (!isset($index[$idx->Key_name]['column'])) {
458:                     $col = array();
459:                     $index[$idx->Key_name]['column'] = $idx->Column_name;
460: 
461:                     if ($idx->Index_type === 'FULLTEXT') {
462:                         $index[$idx->Key_name]['type'] = strtolower($idx->Index_type);
463:                     } else {
464:                         $index[$idx->Key_name]['unique'] = intval($idx->Non_unique == 0);
465:                     }
466:                 } else {
467:                     if (!empty($index[$idx->Key_name]['column']) && !is_array($index[$idx->Key_name]['column'])) {
468:                         $col[] = $index[$idx->Key_name]['column'];
469:                     }
470:                     $col[] = $idx->Column_name;
471:                     $index[$idx->Key_name]['column'] = $col;
472:                 }
473:                 if (!empty($idx->Sub_part)) {
474:                     if (!isset($index[$idx->Key_name]['length'])) {
475:                         $index[$idx->Key_name]['length'] = array();
476:                     }
477:                     $index[$idx->Key_name]['length'][$idx->Column_name] = $idx->Sub_part;
478:                 }
479:             }
480:             // @codingStandardsIgnoreEnd
481:             $indexes->closeCursor();
482:         }
483:         return $index;
484:     }
485: 
486: /**
487:  * Generate a MySQL Alter Table syntax for the given Schema comparison
488:  *
489:  * @param array $compare Result of a CakeSchema::compare()
490:  * @param string $table
491:  * @return array Array of alter statements to make.
492:  */
493:     public function alterSchema($compare, $table = null) {
494:         if (!is_array($compare)) {
495:             return false;
496:         }
497:         $out = '';
498:         $colList = array();
499:         foreach ($compare as $curTable => $types) {
500:             $indexes = $tableParameters = $colList = array();
501:             if (!$table || $table == $curTable) {
502:                 $out .= 'ALTER TABLE ' . $this->fullTableName($curTable) . " \n";
503:                 foreach ($types as $type => $column) {
504:                     if (isset($column['indexes'])) {
505:                         $indexes[$type] = $column['indexes'];
506:                         unset($column['indexes']);
507:                     }
508:                     if (isset($column['tableParameters'])) {
509:                         $tableParameters[$type] = $column['tableParameters'];
510:                         unset($column['tableParameters']);
511:                     }
512:                     switch ($type) {
513:                         case 'add':
514:                             foreach ($column as $field => $col) {
515:                                 $col['name'] = $field;
516:                                 $alter = 'ADD ' . $this->buildColumn($col);
517:                                 if (isset($col['after'])) {
518:                                     $alter .= ' AFTER ' . $this->name($col['after']);
519:                                 }
520:                                 $colList[] = $alter;
521:                             }
522:                             break;
523:                         case 'drop':
524:                             foreach ($column as $field => $col) {
525:                                 $col['name'] = $field;
526:                                 $colList[] = 'DROP ' . $this->name($field);
527:                             }
528:                             break;
529:                         case 'change':
530:                             foreach ($column as $field => $col) {
531:                                 if (!isset($col['name'])) {
532:                                     $col['name'] = $field;
533:                                 }
534:                                 $colList[] = 'CHANGE ' . $this->name($field) . ' ' . $this->buildColumn($col);
535:                             }
536:                             break;
537:                     }
538:                 }
539:                 $colList = array_merge($colList, $this->_alterIndexes($curTable, $indexes));
540:                 $colList = array_merge($colList, $this->_alterTableParameters($curTable, $tableParameters));
541:                 $out .= "\t" . implode(",\n\t", $colList) . ";\n\n";
542:             }
543:         }
544:         return $out;
545:     }
546: 
547: /**
548:  * Generate a "drop table" statement for the given table
549:  *
550:  * @param type $table Name of the table to drop
551:  * @return string Drop table SQL statement
552:  */
553:     protected function _dropTable($table) {
554:         return 'DROP TABLE IF EXISTS ' . $this->fullTableName($table) . ";";
555:     }
556: 
557: /**
558:  * Generate MySQL table parameter alteration statements for a table.
559:  *
560:  * @param string $table Table to alter parameters for.
561:  * @param array $parameters Parameters to add & drop.
562:  * @return array Array of table property alteration statements.
563:  */
564:     protected function _alterTableParameters($table, $parameters) {
565:         if (isset($parameters['change'])) {
566:             return $this->buildTableParameters($parameters['change']);
567:         }
568:         return array();
569:     }
570: 
571: /**
572:  * Format indexes for create table
573:  *
574:  * @param array $indexes An array of indexes to generate SQL from
575:  * @param string $table Optional table name, not used
576:  * @return array An array of SQL statements for indexes
577:  * @see DboSource::buildIndex()
578:  */
579:     public function buildIndex($indexes, $table = null) {
580:         $join = array();
581:         foreach ($indexes as $name => $value) {
582:             $out = '';
583:             if ($name === 'PRIMARY') {
584:                 $out .= 'PRIMARY ';
585:                 $name = null;
586:             } else {
587:                 if (!empty($value['unique'])) {
588:                     $out .= 'UNIQUE ';
589:                 }
590:                 $name = $this->startQuote . $name . $this->endQuote;
591:             }
592:             if (isset($value['type']) && strtolower($value['type']) === 'fulltext') {
593:                 $out .= 'FULLTEXT ';
594:             }
595:             $out .= 'KEY ' . $name . ' (';
596: 
597:             if (is_array($value['column'])) {
598:                 if (isset($value['length'])) {
599:                     $vals = array();
600:                     foreach ($value['column'] as $column) {
601:                         $name = $this->name($column);
602:                         if (isset($value['length'])) {
603:                             $name .= $this->_buildIndexSubPart($value['length'], $column);
604:                         }
605:                         $vals[] = $name;
606:                     }
607:                     $out .= implode(', ', $vals);
608:                 } else {
609:                     $out .= implode(', ', array_map(array(&$this, 'name'), $value['column']));
610:                 }
611:             } else {
612:                 $out .= $this->name($value['column']);
613:                 if (isset($value['length'])) {
614:                     $out .= $this->_buildIndexSubPart($value['length'], $value['column']);
615:                 }
616:             }
617:             $out .= ')';
618:             $join[] = $out;
619:         }
620:         return $join;
621:     }
622: 
623: /**
624:  * Generate MySQL index alteration statements for a table.
625:  *
626:  * @param string $table Table to alter indexes for
627:  * @param array $indexes Indexes to add and drop
628:  * @return array Index alteration statements
629:  */
630:     protected function _alterIndexes($table, $indexes) {
631:         $alter = array();
632:         if (isset($indexes['drop'])) {
633:             foreach ($indexes['drop'] as $name => $value) {
634:                 $out = 'DROP ';
635:                 if ($name === 'PRIMARY') {
636:                     $out .= 'PRIMARY KEY';
637:                 } else {
638:                     $out .= 'KEY ' . $this->startQuote . $name . $this->endQuote;
639:                 }
640:                 $alter[] = $out;
641:             }
642:         }
643:         if (isset($indexes['add'])) {
644:             $add = $this->buildIndex($indexes['add']);
645:             foreach ($add as $index) {
646:                 $alter[] = 'ADD ' . $index;
647:             }
648:         }
649:         return $alter;
650:     }
651: 
652: /**
653:  * Format length for text indexes
654:  *
655:  * @param array $lengths An array of lengths for a single index
656:  * @param string $column The column for which to generate the index length
657:  * @return string Formatted length part of an index field
658:  */
659:     protected function _buildIndexSubPart($lengths, $column) {
660:         if ($lengths === null) {
661:             return '';
662:         }
663:         if (!isset($lengths[$column])) {
664:             return '';
665:         }
666:         return '(' . $lengths[$column] . ')';
667:     }
668: 
669: /**
670:  * Returns an detailed array of sources (tables) in the database.
671:  *
672:  * @param string $name Table name to get parameters
673:  * @return array Array of table names in the database
674:  */
675:     public function listDetailedSources($name = null) {
676:         $condition = '';
677:         if (is_string($name)) {
678:             $condition = ' WHERE name = ' . $this->value($name);
679:         }
680:         $result = $this->_connection->query('SHOW TABLE STATUS ' . $condition, PDO::FETCH_ASSOC);
681: 
682:         if (!$result) {
683:             $result->closeCursor();
684:             return array();
685:         }
686:         $tables = array();
687:         foreach ($result as $row) {
688:             $tables[$row['Name']] = (array)$row;
689:             unset($tables[$row['Name']]['queryString']);
690:             if (!empty($row['Collation'])) {
691:                 $charset = $this->getCharsetName($row['Collation']);
692:                 if ($charset) {
693:                     $tables[$row['Name']]['charset'] = $charset;
694:                 }
695:             }
696:         }
697:         $result->closeCursor();
698:         if (is_string($name) && isset($tables[$name])) {
699:             return $tables[$name];
700:         }
701:         return $tables;
702:     }
703: 
704: /**
705:  * Converts database-layer column types to basic types
706:  *
707:  * @param string $real Real database-layer column type (i.e. "varchar(255)")
708:  * @return string Abstract column type (i.e. "string")
709:  */
710:     public function column($real) {
711:         if (is_array($real)) {
712:             $col = $real['name'];
713:             if (isset($real['limit'])) {
714:                 $col .= '(' . $real['limit'] . ')';
715:             }
716:             return $col;
717:         }
718: 
719:         $col = str_replace(')', '', $real);
720:         $limit = $this->length($real);
721:         if (strpos($col, '(') !== false) {
722:             list($col, $vals) = explode('(', $col);
723:         }
724: 
725:         if (in_array($col, array('date', 'time', 'datetime', 'timestamp'))) {
726:             return $col;
727:         }
728:         if (($col === 'tinyint' && $limit === 1) || $col === 'boolean') {
729:             return 'boolean';
730:         }
731:         if (strpos($col, 'bigint') !== false || $col === 'bigint') {
732:             return 'biginteger';
733:         }
734:         if (strpos($col, 'int') !== false) {
735:             return 'integer';
736:         }
737:         if (strpos($col, 'char') !== false || $col === 'tinytext') {
738:             return 'string';
739:         }
740:         if (strpos($col, 'text') !== false) {
741:             return 'text';
742:         }
743:         if (strpos($col, 'blob') !== false || $col === 'binary') {
744:             return 'binary';
745:         }
746:         if (strpos($col, 'float') !== false || strpos($col, 'double') !== false || strpos($col, 'decimal') !== false) {
747:             return 'float';
748:         }
749:         if (strpos($col, 'enum') !== false) {
750:             return "enum($vals)";
751:         }
752:         return 'text';
753:     }
754: 
755: /**
756:  * Gets the schema name
757:  *
758:  * @return string The schema name
759:  */
760:     public function getSchemaName() {
761:         return $this->config['database'];
762:     }
763: 
764: /**
765:  * Check if the server support nested transactions
766:  *
767:  * @return boolean
768:  */
769:     public function nestedTransactionSupported() {
770:         return $this->useNestedTransactions && version_compare($this->getVersion(), '4.1', '>=');
771:     }
772: 
773: }
774: