1: <?php
  2: /**
  3:  * MySQL 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 0.10.5.1790
 16:  * @license       http://www.opensource.org/licenses/mit-license.php MIT License
 17:  */
 18: 
 19: App::uses('DboSource', 'Model/Datasource');
 20: 
 21: /**
 22:  * MySQL DBO driver object
 23:  *
 24:  * Provides connection and SQL generation for MySQL RDMS
 25:  *
 26:  * @package       Cake.Model.Datasource.Database
 27:  */
 28: class Mysql extends DboSource {
 29: 
 30: /**
 31:  * Datasource description
 32:  *
 33:  * @var string
 34:  */
 35:     public $description = "MySQL DBO Driver";
 36: 
 37: /**
 38:  * Base configuration settings for MySQL driver
 39:  *
 40:  * @var array
 41:  */
 42:     protected $_baseConfig = array(
 43:         'persistent' => true,
 44:         'host' => 'localhost',
 45:         'login' => 'root',
 46:         'password' => '',
 47:         'database' => 'cake',
 48:         'port' => '3306',
 49:         'flags' => array()
 50:     );
 51: 
 52: /**
 53:  * Reference to the PDO object connection
 54:  *
 55:  * @var PDO
 56:  */
 57:     protected $_connection = null;
 58: 
 59: /**
 60:  * Start quote
 61:  *
 62:  * @var string
 63:  */
 64:     public $startQuote = "`";
 65: 
 66: /**
 67:  * End quote
 68:  *
 69:  * @var string
 70:  */
 71:     public $endQuote = "`";
 72: 
 73: /**
 74:  * use alias for update and delete. Set to true if version >= 4.1
 75:  *
 76:  * @var bool
 77:  */
 78:     protected $_useAlias = true;
 79: 
 80: /**
 81:  * List of engine specific additional field parameters used on table creating
 82:  *
 83:  * @var array
 84:  */
 85:     public $fieldParameters = array(
 86:         'charset' => array('value' => 'CHARACTER SET', 'quote' => false, 'join' => ' ', 'column' => false, 'position' => 'beforeDefault'),
 87:         'collate' => array('value' => 'COLLATE', 'quote' => false, 'join' => ' ', 'column' => 'Collation', 'position' => 'beforeDefault'),
 88:         'comment' => array('value' => 'COMMENT', 'quote' => true, 'join' => ' ', 'column' => 'Comment', 'position' => 'afterDefault'),
 89:         'unsigned' => array(
 90:             'value' => 'UNSIGNED', 'quote' => false, 'join' => ' ', 'column' => false, 'position' => 'beforeDefault',
 91:             'noVal' => true,
 92:             'options' => array(true),
 93:             'types' => array('integer', 'float', 'decimal', 'biginteger')
 94:         )
 95:     );
 96: 
 97: /**
 98:  * List of table engine specific parameters used on table creating
 99:  *
100:  * @var array
101:  */
102:     public $tableParameters = array(
103:         'charset' => array('value' => 'DEFAULT CHARSET', 'quote' => false, 'join' => '=', 'column' => 'charset'),
104:         'collate' => array('value' => 'COLLATE', 'quote' => false, 'join' => '=', 'column' => 'Collation'),
105:         'engine' => array('value' => 'ENGINE', 'quote' => false, 'join' => '=', 'column' => 'Engine'),
106:         'comment' => array('value' => 'COMMENT', 'quote' => true, 'join' => '=', 'column' => 'Comment'),
107:     );
108: 
109: /**
110:  * MySQL column definition
111:  *
112:  * @var array
113:  */
114:     public $columns = array(
115:         'primary_key' => array('name' => 'NOT NULL AUTO_INCREMENT'),
116:         'string' => array('name' => 'varchar', 'limit' => '255'),
117:         'text' => array('name' => 'text'),
118:         'biginteger' => array('name' => 'bigint', 'limit' => '20'),
119:         'integer' => array('name' => 'int', 'limit' => '11', 'formatter' => 'intval'),
120:         'float' => array('name' => 'float', 'formatter' => 'floatval'),
121:         'decimal' => array('name' => 'decimal', 'formatter' => 'floatval'),
122:         'datetime' => array('name' => 'datetime', 'format' => 'Y-m-d H:i:s', 'formatter' => 'date'),
123:         'timestamp' => array('name' => 'timestamp', 'format' => 'Y-m-d H:i:s', 'formatter' => 'date'),
124:         'time' => array('name' => 'time', 'format' => 'H:i:s', 'formatter' => 'date'),
125:         'date' => array('name' => 'date', 'format' => 'Y-m-d', 'formatter' => 'date'),
126:         'binary' => array('name' => 'blob'),
127:         'boolean' => array('name' => 'tinyint', 'limit' => '1')
128:     );
129: 
130: /**
131:  * Mapping of collation names to character set names
132:  *
133:  * @var array
134:  */
135:     protected $_charsets = array();
136: 
137: /**
138:  * Connects to the database using options in the given configuration array.
139:  *
140:  * MySQL supports a few additional options that other drivers do not:
141:  *
142:  * - `unix_socket` Set to the path of the MySQL sock file. Can be used in place
143:  *   of host + port.
144:  * - `ssl_key` SSL key file for connecting via SSL. Must be combined with `ssl_cert`.
145:  * - `ssl_cert` The SSL certificate to use when connecting via SSL. Must be
146:  *   combined with `ssl_key`.
147:  * - `ssl_ca` The certificate authority for SSL connections.
148:  *
149:  * @return bool True if the database could be connected, else false
150:  * @throws MissingConnectionException
151:  */
152:     public function connect() {
153:         $config = $this->config;
154:         $this->connected = false;
155: 
156:         $flags = $config['flags'] + array(
157:             PDO::ATTR_PERSISTENT => $config['persistent'],
158:             PDO::MYSQL_ATTR_USE_BUFFERED_QUERY => true,
159:             PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION
160:         );
161: 
162:         if (!empty($config['encoding'])) {
163:             $flags[PDO::MYSQL_ATTR_INIT_COMMAND] = 'SET NAMES ' . $config['encoding'];
164:         }
165:         if (!empty($config['ssl_key']) && !empty($config['ssl_cert'])) {
166:             $flags[PDO::MYSQL_ATTR_SSL_KEY] = $config['ssl_key'];
167:             $flags[PDO::MYSQL_ATTR_SSL_CERT] = $config['ssl_cert'];
168:         }
169:         if (!empty($config['ssl_ca'])) {
170:             $flags[PDO::MYSQL_ATTR_SSL_CA] = $config['ssl_ca'];
171:         }
172:         if (empty($config['unix_socket'])) {
173:             $dsn = "mysql:host={$config['host']};port={$config['port']};dbname={$config['database']}";
174:         } else {
175:             $dsn = "mysql:unix_socket={$config['unix_socket']};dbname={$config['database']}";
176:         }
177: 
178:         try {
179:             $this->_connection = new PDO(
180:                 $dsn,
181:                 $config['login'],
182:                 $config['password'],
183:                 $flags
184:             );
185:             $this->connected = true;
186:             if (!empty($config['settings'])) {
187:                 foreach ($config['settings'] as $key => $value) {
188:                     $this->_execute("SET $key=$value");
189:                 }
190:             }
191:         } catch (PDOException $e) {
192:             throw new MissingConnectionException(array(
193:                 'class' => get_class($this),
194:                 'message' => $e->getMessage()
195:             ));
196:         }
197: 
198:         $this->_charsets = array();
199:         $this->_useAlias = (bool)version_compare($this->getVersion(), "4.1", ">=");
200: 
201:         return $this->connected;
202:     }
203: 
204: /**
205:  * Check whether the MySQL extension is installed/loaded
206:  *
207:  * @return bool
208:  */
209:     public function enabled() {
210:         return in_array('mysql', PDO::getAvailableDrivers());
211:     }
212: 
213: /**
214:  * Returns an array of sources (tables) in the database.
215:  *
216:  * @param mixed $data List of tables.
217:  * @return array Array of table names in the database
218:  */
219:     public function listSources($data = null) {
220:         $cache = parent::listSources();
221:         if ($cache) {
222:             return $cache;
223:         }
224:         $result = $this->_execute('SHOW TABLES FROM ' . $this->name($this->config['database']));
225: 
226:         if (!$result) {
227:             $result->closeCursor();
228:             return array();
229:         }
230:         $tables = array();
231: 
232:         while ($line = $result->fetch(PDO::FETCH_NUM)) {
233:             $tables[] = $line[0];
234:         }
235: 
236:         $result->closeCursor();
237:         parent::listSources($tables);
238:         return $tables;
239:     }
240: 
241: /**
242:  * Builds a map of the columns contained in a result
243:  *
244:  * @param PDOStatement $results The results to format.
245:  * @return void
246:  */
247:     public function resultSet($results) {
248:         $this->map = array();
249:         $numFields = $results->columnCount();
250:         $index = 0;
251: 
252:         while ($numFields-- > 0) {
253:             $column = $results->getColumnMeta($index);
254:             if ($column['len'] === 1 && (empty($column['native_type']) || $column['native_type'] === 'TINY')) {
255:                 $type = 'boolean';
256:             } else {
257:                 $type = empty($column['native_type']) ? 'string' : $column['native_type'];
258:             }
259:             if (!empty($column['table']) && strpos($column['name'], $this->virtualFieldSeparator) === false) {
260:                 $this->map[$index++] = array($column['table'], $column['name'], $type);
261:             } else {
262:                 $this->map[$index++] = array(0, $column['name'], $type);
263:             }
264:         }
265:     }
266: 
267: /**
268:  * Fetches the next row from the current result set
269:  *
270:  * @return mixed array with results fetched and mapped to column names or false if there is no results left to fetch
271:  */
272:     public function fetchResult() {
273:         if ($row = $this->_result->fetch(PDO::FETCH_NUM)) {
274:             $resultRow = array();
275:             foreach ($this->map as $col => $meta) {
276:                 list($table, $column, $type) = $meta;
277:                 $resultRow[$table][$column] = $row[$col];
278:                 if ($type === 'boolean' && $row[$col] !== null) {
279:                     $resultRow[$table][$column] = $this->boolean($resultRow[$table][$column]);
280:                 }
281:             }
282:             return $resultRow;
283:         }
284:         $this->_result->closeCursor();
285:         return false;
286:     }
287: 
288: /**
289:  * Gets the database encoding
290:  *
291:  * @return string The database encoding
292:  */
293:     public function getEncoding() {
294:         return $this->_execute('SHOW VARIABLES LIKE ?', array('character_set_client'))->fetchObject()->Value;
295:     }
296: 
297: /**
298:  * Query charset by collation
299:  *
300:  * @param string $name Collation name
301:  * @return string Character set name
302:  */
303:     public function getCharsetName($name) {
304:         if ((bool)version_compare($this->getVersion(), "5", "<")) {
305:             return false;
306:         }
307:         if (isset($this->_charsets[$name])) {
308:             return $this->_charsets[$name];
309:         }
310:         $r = $this->_execute(
311:             'SELECT CHARACTER_SET_NAME FROM INFORMATION_SCHEMA.COLLATIONS WHERE COLLATION_NAME = ?',
312:             array($name)
313:         );
314:         $cols = $r->fetch(PDO::FETCH_ASSOC);
315: 
316:         if (isset($cols['CHARACTER_SET_NAME'])) {
317:             $this->_charsets[$name] = $cols['CHARACTER_SET_NAME'];
318:         } else {
319:             $this->_charsets[$name] = false;
320:         }
321:         return $this->_charsets[$name];
322:     }
323: 
324: /**
325:  * Returns an array of the fields in given table name.
326:  *
327:  * @param Model|string $model Name of database table to inspect or model instance
328:  * @return array Fields in table. Keys are name and type
329:  * @throws CakeException
330:  */
331:     public function describe($model) {
332:         $key = $this->fullTableName($model, false);
333:         $cache = parent::describe($key);
334:         if ($cache) {
335:             return $cache;
336:         }
337:         $table = $this->fullTableName($model);
338: 
339:         $fields = false;
340:         $cols = $this->_execute('SHOW FULL COLUMNS FROM ' . $table);
341:         if (!$cols) {
342:             throw new CakeException(__d('cake_dev', 'Could not describe table for %s', $table));
343:         }
344: 
345:         while ($column = $cols->fetch(PDO::FETCH_OBJ)) {
346:             $fields[$column->Field] = array(
347:                 'type' => $this->column($column->Type),
348:                 'null' => ($column->Null === 'YES' ? true : false),
349:                 'default' => $column->Default,
350:                 'length' => $this->length($column->Type)
351:             );
352:             if (in_array($fields[$column->Field]['type'], $this->fieldParameters['unsigned']['types'], true)) {
353:                 $fields[$column->Field]['unsigned'] = $this->_unsigned($column->Type);
354:             }
355:             if ($fields[$column->Field]['type'] === 'timestamp' && strtoupper($column->Default) === 'CURRENT_TIMESTAMP') {
356:                 $fields[$column->Field]['default'] = null;
357:             }
358:             if (!empty($column->Key) && isset($this->index[$column->Key])) {
359:                 $fields[$column->Field]['key'] = $this->index[$column->Key];
360:             }
361:             foreach ($this->fieldParameters as $name => $value) {
362:                 if (!empty($column->{$value['column']})) {
363:                     $fields[$column->Field][$name] = $column->{$value['column']};
364:                 }
365:             }
366:             if (isset($fields[$column->Field]['collate'])) {
367:                 $charset = $this->getCharsetName($fields[$column->Field]['collate']);
368:                 if ($charset) {
369:                     $fields[$column->Field]['charset'] = $charset;
370:                 }
371:             }
372:         }
373:         $this->_cacheDescription($key, $fields);
374:         $cols->closeCursor();
375:         return $fields;
376:     }
377: 
378: /**
379:  * Generates and executes an SQL UPDATE statement for given model, fields, and values.
380:  *
381:  * @param Model $model The model to update.
382:  * @param array $fields The fields to update.
383:  * @param array $values The values to set.
384:  * @param mixed $conditions The conditions to use.
385:  * @return array
386:  */
387:     public function update(Model $model, $fields = array(), $values = null, $conditions = null) {
388:         if (!$this->_useAlias) {
389:             return parent::update($model, $fields, $values, $conditions);
390:         }
391: 
392:         if (!$values) {
393:             $combined = $fields;
394:         } else {
395:             $combined = array_combine($fields, $values);
396:         }
397: 
398:         $alias = $joins = false;
399:         $fields = $this->_prepareUpdateFields($model, $combined, empty($conditions), !empty($conditions));
400:         $fields = implode(', ', $fields);
401:         $table = $this->fullTableName($model);
402: 
403:         if (!empty($conditions)) {
404:             $alias = $this->name($model->alias);
405:             if ($model->name === $model->alias) {
406:                 $joins = implode(' ', $this->_getJoins($model));
407:             }
408:         }
409:         $conditions = $this->conditions($this->defaultConditions($model, $conditions, $alias), true, true, $model);
410: 
411:         if ($conditions === false) {
412:             return false;
413:         }
414: 
415:         if (!$this->execute($this->renderStatement('update', compact('table', 'alias', 'joins', 'fields', 'conditions')))) {
416:             $model->onError();
417:             return false;
418:         }
419:         return true;
420:     }
421: 
422: /**
423:  * Generates and executes an SQL DELETE statement for given id/conditions on given model.
424:  *
425:  * @param Model $model The model to delete from.
426:  * @param mixed $conditions The conditions to use.
427:  * @return bool Success
428:  */
429:     public function delete(Model $model, $conditions = null) {
430:         if (!$this->_useAlias) {
431:             return parent::delete($model, $conditions);
432:         }
433:         $alias = $this->name($model->alias);
434:         $table = $this->fullTableName($model);
435:         $joins = implode(' ', $this->_getJoins($model));
436: 
437:         if (empty($conditions)) {
438:             $alias = $joins = false;
439:         }
440:         $complexConditions = false;
441:         foreach ((array)$conditions as $key => $value) {
442:             if (strpos($key, $model->alias) === false) {
443:                 $complexConditions = true;
444:                 break;
445:             }
446:         }
447:         if (!$complexConditions) {
448:             $joins = false;
449:         }
450: 
451:         $conditions = $this->conditions($this->defaultConditions($model, $conditions, $alias), true, true, $model);
452:         if ($conditions === false) {
453:             return false;
454:         }
455:         if ($this->execute($this->renderStatement('delete', compact('alias', 'table', 'joins', 'conditions'))) === false) {
456:             $model->onError();
457:             return false;
458:         }
459:         return true;
460:     }
461: 
462: /**
463:  * Sets the database encoding
464:  *
465:  * @param string $enc Database encoding
466:  * @return bool
467:  */
468:     public function setEncoding($enc) {
469:         return $this->_execute('SET NAMES ' . $enc) !== false;
470:     }
471: 
472: /**
473:  * Returns an array of the indexes in given datasource name.
474:  *
475:  * @param string $model Name of model to inspect
476:  * @return array Fields in table. Keys are column and unique
477:  */
478:     public function index($model) {
479:         $index = array();
480:         $table = $this->fullTableName($model);
481:         $old = version_compare($this->getVersion(), '4.1', '<=');
482:         if ($table) {
483:             $indexes = $this->_execute('SHOW INDEX FROM ' . $table);
484:             // @codingStandardsIgnoreStart
485:             // MySQL columns don't match the cakephp conventions.
486:             while ($idx = $indexes->fetch(PDO::FETCH_OBJ)) {
487:                 if ($old) {
488:                     $idx = (object)current((array)$idx);
489:                 }
490:                 if (!isset($index[$idx->Key_name]['column'])) {
491:                     $col = array();
492:                     $index[$idx->Key_name]['column'] = $idx->Column_name;
493: 
494:                     if ($idx->Index_type === 'FULLTEXT') {
495:                         $index[$idx->Key_name]['type'] = strtolower($idx->Index_type);
496:                     } else {
497:                         $index[$idx->Key_name]['unique'] = (int)($idx->Non_unique == 0);
498:                     }
499:                 } else {
500:                     if (!empty($index[$idx->Key_name]['column']) && !is_array($index[$idx->Key_name]['column'])) {
501:                         $col[] = $index[$idx->Key_name]['column'];
502:                     }
503:                     $col[] = $idx->Column_name;
504:                     $index[$idx->Key_name]['column'] = $col;
505:                 }
506:                 if (!empty($idx->Sub_part)) {
507:                     if (!isset($index[$idx->Key_name]['length'])) {
508:                         $index[$idx->Key_name]['length'] = array();
509:                     }
510:                     $index[$idx->Key_name]['length'][$idx->Column_name] = $idx->Sub_part;
511:                 }
512:             }
513:             // @codingStandardsIgnoreEnd
514:             $indexes->closeCursor();
515:         }
516:         return $index;
517:     }
518: 
519: /**
520:  * Generate a MySQL Alter Table syntax for the given Schema comparison
521:  *
522:  * @param array $compare Result of a CakeSchema::compare()
523:  * @param string $table The table name.
524:  * @return array Array of alter statements to make.
525:  */
526:     public function alterSchema($compare, $table = null) {
527:         if (!is_array($compare)) {
528:             return false;
529:         }
530:         $out = '';
531:         $colList = array();
532:         foreach ($compare as $curTable => $types) {
533:             $indexes = $tableParameters = $colList = array();
534:             if (!$table || $table === $curTable) {
535:                 $out .= 'ALTER TABLE ' . $this->fullTableName($curTable) . " \n";
536:                 foreach ($types as $type => $column) {
537:                     if (isset($column['indexes'])) {
538:                         $indexes[$type] = $column['indexes'];
539:                         unset($column['indexes']);
540:                     }
541:                     if (isset($column['tableParameters'])) {
542:                         $tableParameters[$type] = $column['tableParameters'];
543:                         unset($column['tableParameters']);
544:                     }
545:                     switch ($type) {
546:                         case 'add':
547:                             foreach ($column as $field => $col) {
548:                                 $col['name'] = $field;
549:                                 $alter = 'ADD ' . $this->buildColumn($col);
550:                                 if (isset($col['after'])) {
551:                                     $alter .= ' AFTER ' . $this->name($col['after']);
552:                                 }
553:                                 $colList[] = $alter;
554:                             }
555:                             break;
556:                         case 'drop':
557:                             foreach ($column as $field => $col) {
558:                                 $col['name'] = $field;
559:                                 $colList[] = 'DROP ' . $this->name($field);
560:                             }
561:                             break;
562:                         case 'change':
563:                             foreach ($column as $field => $col) {
564:                                 if (!isset($col['name'])) {
565:                                     $col['name'] = $field;
566:                                 }
567:                                 $alter = 'CHANGE ' . $this->name($field) . ' ' . $this->buildColumn($col);
568:                                 if (isset($col['after'])) {
569:                                     $alter .= ' AFTER ' . $this->name($col['after']);
570:                                 }
571:                                 $colList[] = $alter;
572:                             }
573:                             break;
574:                     }
575:                 }
576:                 $colList = array_merge($colList, $this->_alterIndexes($curTable, $indexes));
577:                 $colList = array_merge($colList, $this->_alterTableParameters($curTable, $tableParameters));
578:                 $out .= "\t" . implode(",\n\t", $colList) . ";\n\n";
579:             }
580:         }
581:         return $out;
582:     }
583: 
584: /**
585:  * Generate a "drop table" statement for the given table
586:  *
587:  * @param type $table Name of the table to drop
588:  * @return string Drop table SQL statement
589:  */
590:     protected function _dropTable($table) {
591:         return 'DROP TABLE IF EXISTS ' . $this->fullTableName($table) . ";";
592:     }
593: 
594: /**
595:  * Generate MySQL table parameter alteration statements for a table.
596:  *
597:  * @param string $table Table to alter parameters for.
598:  * @param array $parameters Parameters to add & drop.
599:  * @return array Array of table property alteration statements.
600:  */
601:     protected function _alterTableParameters($table, $parameters) {
602:         if (isset($parameters['change'])) {
603:             return $this->buildTableParameters($parameters['change']);
604:         }
605:         return array();
606:     }
607: 
608: /**
609:  * Format indexes for create table
610:  *
611:  * @param array $indexes An array of indexes to generate SQL from
612:  * @param string $table Optional table name, not used
613:  * @return array An array of SQL statements for indexes
614:  * @see DboSource::buildIndex()
615:  */
616:     public function buildIndex($indexes, $table = null) {
617:         $join = array();
618:         foreach ($indexes as $name => $value) {
619:             $out = '';
620:             if ($name === 'PRIMARY') {
621:                 $out .= 'PRIMARY ';
622:                 $name = null;
623:             } else {
624:                 if (!empty($value['unique'])) {
625:                     $out .= 'UNIQUE ';
626:                 }
627:                 $name = $this->startQuote . $name . $this->endQuote;
628:             }
629:             if (isset($value['type']) && strtolower($value['type']) === 'fulltext') {
630:                 $out .= 'FULLTEXT ';
631:             }
632:             $out .= 'KEY ' . $name . ' (';
633: 
634:             if (is_array($value['column'])) {
635:                 if (isset($value['length'])) {
636:                     $vals = array();
637:                     foreach ($value['column'] as $column) {
638:                         $name = $this->name($column);
639:                         if (isset($value['length'])) {
640:                             $name .= $this->_buildIndexSubPart($value['length'], $column);
641:                         }
642:                         $vals[] = $name;
643:                     }
644:                     $out .= implode(', ', $vals);
645:                 } else {
646:                     $out .= implode(', ', array_map(array(&$this, 'name'), $value['column']));
647:                 }
648:             } else {
649:                 $out .= $this->name($value['column']);
650:                 if (isset($value['length'])) {
651:                     $out .= $this->_buildIndexSubPart($value['length'], $value['column']);
652:                 }
653:             }
654:             $out .= ')';
655:             $join[] = $out;
656:         }
657:         return $join;
658:     }
659: 
660: /**
661:  * Generate MySQL index alteration statements for a table.
662:  *
663:  * @param string $table Table to alter indexes for
664:  * @param array $indexes Indexes to add and drop
665:  * @return array Index alteration statements
666:  */
667:     protected function _alterIndexes($table, $indexes) {
668:         $alter = array();
669:         if (isset($indexes['drop'])) {
670:             foreach ($indexes['drop'] as $name => $value) {
671:                 $out = 'DROP ';
672:                 if ($name === 'PRIMARY') {
673:                     $out .= 'PRIMARY KEY';
674:                 } else {
675:                     $out .= 'KEY ' . $this->startQuote . $name . $this->endQuote;
676:                 }
677:                 $alter[] = $out;
678:             }
679:         }
680:         if (isset($indexes['add'])) {
681:             $add = $this->buildIndex($indexes['add']);
682:             foreach ($add as $index) {
683:                 $alter[] = 'ADD ' . $index;
684:             }
685:         }
686:         return $alter;
687:     }
688: 
689: /**
690:  * Format length for text indexes
691:  *
692:  * @param array $lengths An array of lengths for a single index
693:  * @param string $column The column for which to generate the index length
694:  * @return string Formatted length part of an index field
695:  */
696:     protected function _buildIndexSubPart($lengths, $column) {
697:         if ($lengths === null) {
698:             return '';
699:         }
700:         if (!isset($lengths[$column])) {
701:             return '';
702:         }
703:         return '(' . $lengths[$column] . ')';
704:     }
705: 
706: /**
707:  * Returns a detailed array of sources (tables) in the database.
708:  *
709:  * @param string $name Table name to get parameters
710:  * @return array Array of table names in the database
711:  */
712:     public function listDetailedSources($name = null) {
713:         $condition = '';
714:         if (is_string($name)) {
715:             $condition = ' WHERE name = ' . $this->value($name);
716:         }
717:         $result = $this->_connection->query('SHOW TABLE STATUS ' . $condition, PDO::FETCH_ASSOC);
718: 
719:         if (!$result) {
720:             $result->closeCursor();
721:             return array();
722:         }
723:         $tables = array();
724:         foreach ($result as $row) {
725:             $tables[$row['Name']] = (array)$row;
726:             unset($tables[$row['Name']]['queryString']);
727:             if (!empty($row['Collation'])) {
728:                 $charset = $this->getCharsetName($row['Collation']);
729:                 if ($charset) {
730:                     $tables[$row['Name']]['charset'] = $charset;
731:                 }
732:             }
733:         }
734:         $result->closeCursor();
735:         if (is_string($name) && isset($tables[$name])) {
736:             return $tables[$name];
737:         }
738:         return $tables;
739:     }
740: 
741: /**
742:  * Converts database-layer column types to basic types
743:  *
744:  * @param string $real Real database-layer column type (i.e. "varchar(255)")
745:  * @return string Abstract column type (i.e. "string")
746:  */
747:     public function column($real) {
748:         if (is_array($real)) {
749:             $col = $real['name'];
750:             if (isset($real['limit'])) {
751:                 $col .= '(' . $real['limit'] . ')';
752:             }
753:             return $col;
754:         }
755: 
756:         $col = str_replace(')', '', $real);
757:         $limit = $this->length($real);
758:         if (strpos($col, '(') !== false) {
759:             list($col, $vals) = explode('(', $col);
760:         }
761: 
762:         if (in_array($col, array('date', 'time', 'datetime', 'timestamp'))) {
763:             return $col;
764:         }
765:         if (($col === 'tinyint' && $limit === 1) || $col === 'boolean') {
766:             return 'boolean';
767:         }
768:         if (strpos($col, 'bigint') !== false || $col === 'bigint') {
769:             return 'biginteger';
770:         }
771:         if (strpos($col, 'int') !== false) {
772:             return 'integer';
773:         }
774:         if (strpos($col, 'char') !== false || $col === 'tinytext') {
775:             return 'string';
776:         }
777:         if (strpos($col, 'text') !== false) {
778:             return 'text';
779:         }
780:         if (strpos($col, 'blob') !== false || $col === 'binary') {
781:             return 'binary';
782:         }
783:         if (strpos($col, 'float') !== false || strpos($col, 'double') !== false) {
784:             return 'float';
785:         }
786:         if (strpos($col, 'decimal') !== false || strpos($col, 'numeric') !== false) {
787:             return 'decimal';
788:         }
789:         if (strpos($col, 'enum') !== false) {
790:             return "enum($vals)";
791:         }
792:         if (strpos($col, 'set') !== false) {
793:             return "set($vals)";
794:         }
795:         return 'text';
796:     }
797: 
798: /**
799:  * {@inheritDoc}
800:  */
801:     public function value($data, $column = null) {
802:         $value = parent::value($data, $column);
803:         if (is_numeric($value) && substr($column, 0, 3) === 'set') {
804:             return $this->_connection->quote($value);
805:         }
806:         return $value;
807:     }
808: 
809: /**
810:  * Gets the schema name
811:  *
812:  * @return string The schema name
813:  */
814:     public function getSchemaName() {
815:         return $this->config['database'];
816:     }
817: 
818: /**
819:  * Check if the server support nested transactions
820:  *
821:  * @return bool
822:  */
823:     public function nestedTransactionSupported() {
824:         return $this->useNestedTransactions && version_compare($this->getVersion(), '4.1', '>=');
825:     }
826: 
827: /**
828:  * Check if column type is unsigned
829:  *
830:  * @param string $real Real database-layer column type (i.e. "varchar(255)")
831:  * @return bool True if column is unsigned, false otherwise
832:  */
833:     protected function _unsigned($real) {
834:         return strpos(strtolower($real), 'unsigned') !== false;
835:     }
836: 
837: }
838: