1: <?php
  2: /**
  3:  * MS SQL Server 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:  * Dbo layer for Microsoft's official SQLServer driver
 23:  *
 24:  * A Dbo layer for MS SQL Server 2005 and higher. Requires the
 25:  * `pdo_sqlsrv` extension to be enabled.
 26:  *
 27:  * @link http://www.php.net/manual/en/ref.pdo-sqlsrv.php
 28:  *
 29:  * @package       Cake.Model.Datasource.Database
 30:  */
 31: class Sqlserver extends DboSource {
 32: 
 33: /**
 34:  * Driver description
 35:  *
 36:  * @var string
 37:  */
 38:     public $description = "SQL Server DBO Driver";
 39: 
 40: /**
 41:  * Starting quote character for quoted identifiers
 42:  *
 43:  * @var string
 44:  */
 45:     public $startQuote = "[";
 46: 
 47: /**
 48:  * Ending quote character for quoted identifiers
 49:  *
 50:  * @var string
 51:  */
 52:     public $endQuote = "]";
 53: 
 54: /**
 55:  * Creates a map between field aliases and numeric indexes. Workaround for the
 56:  * SQL Server driver's 30-character column name limitation.
 57:  *
 58:  * @var array
 59:  */
 60:     protected $_fieldMappings = array();
 61: 
 62: /**
 63:  * Storing the last affected value
 64:  *
 65:  * @var mixed
 66:  */
 67:     protected $_lastAffected = false;
 68: 
 69: /**
 70:  * Base configuration settings for MS SQL driver
 71:  *
 72:  * @var array
 73:  */
 74:     protected $_baseConfig = array(
 75:         'persistent' => true,
 76:         'host' => 'localhost\SQLEXPRESS',
 77:         'login' => '',
 78:         'password' => '',
 79:         'database' => 'cake',
 80:         'schema' => '',
 81:         'flags' => array()
 82:     );
 83: 
 84: /**
 85:  * MS SQL column definition
 86:  *
 87:  * @var array
 88:  */
 89:     public $columns = array(
 90:         'primary_key' => array('name' => 'IDENTITY (1, 1) NOT NULL'),
 91:         'string' => array('name' => 'nvarchar', 'limit' => '255'),
 92:         'text' => array('name' => 'nvarchar', 'limit' => 'MAX'),
 93:         'integer' => array('name' => 'int', 'formatter' => 'intval'),
 94:         'biginteger' => array('name' => 'bigint'),
 95:         'numeric' => array('name' => 'decimal', 'formatter' => 'floatval'),
 96:         'decimal' => array('name' => 'decimal', 'formatter' => 'floatval'),
 97:         'float' => array('name' => 'float', 'formatter' => 'floatval'),
 98:         'real' => array('name' => 'float', 'formatter' => 'floatval'),
 99:         'datetime' => array('name' => 'datetime', 'format' => 'Y-m-d H:i:s', 'formatter' => 'date'),
100:         'timestamp' => array('name' => 'timestamp', 'format' => 'Y-m-d H:i:s', 'formatter' => 'date'),
101:         'time' => array('name' => 'datetime', 'format' => 'H:i:s', 'formatter' => 'date'),
102:         'date' => array('name' => 'datetime', 'format' => 'Y-m-d', 'formatter' => 'date'),
103:         'binary' => array('name' => 'varbinary'),
104:         'boolean' => array('name' => 'bit')
105:     );
106: 
107: /**
108:  * Magic column name used to provide pagination support for SQLServer 2008
109:  * which lacks proper limit/offset support.
110:  *
111:  * @var string
112:  */
113:     const ROW_COUNTER = '_cake_page_rownum_';
114: 
115: /**
116:  * Connects to the database using options in the given configuration array.
117:  *
118:  * @return bool True if the database could be connected, else false
119:  * @throws MissingConnectionException
120:  */
121:     public function connect() {
122:         $config = $this->config;
123:         $this->connected = false;
124: 
125:         $flags = $config['flags'] + array(
126:             PDO::ATTR_PERSISTENT => $config['persistent'],
127:             PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION
128:         );
129: 
130:         if (!empty($config['encoding'])) {
131:             $flags[PDO::SQLSRV_ATTR_ENCODING] = $config['encoding'];
132:         }
133: 
134:         try {
135:             $this->_connection = new PDO(
136:                 "sqlsrv:server={$config['host']};Database={$config['database']}",
137:                 $config['login'],
138:                 $config['password'],
139:                 $flags
140:             );
141:             $this->connected = true;
142:             if (!empty($config['settings'])) {
143:                 foreach ($config['settings'] as $key => $value) {
144:                     $this->_execute("SET $key $value");
145:                 }
146:             }
147:         } catch (PDOException $e) {
148:             throw new MissingConnectionException(array(
149:                 'class' => get_class($this),
150:                 'message' => $e->getMessage()
151:             ));
152:         }
153: 
154:         return $this->connected;
155:     }
156: 
157: /**
158:  * Check that PDO SQL Server is installed/loaded
159:  *
160:  * @return bool
161:  */
162:     public function enabled() {
163:         return in_array('sqlsrv', PDO::getAvailableDrivers());
164:     }
165: 
166: /**
167:  * Returns an array of sources (tables) in the database.
168:  *
169:  * @param mixed $data The names
170:  * @return array Array of table names in the database
171:  */
172:     public function listSources($data = null) {
173:         $cache = parent::listSources();
174:         if ($cache !== null) {
175:             return $cache;
176:         }
177:         $result = $this->_execute("SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES");
178: 
179:         if (!$result) {
180:             $result->closeCursor();
181:             return array();
182:         }
183:         $tables = array();
184: 
185:         while ($line = $result->fetch(PDO::FETCH_NUM)) {
186:             $tables[] = $line[0];
187:         }
188: 
189:         $result->closeCursor();
190:         parent::listSources($tables);
191:         return $tables;
192:     }
193: 
194: /**
195:  * Returns an array of the fields in given table name.
196:  *
197:  * @param Model|string $model Model object to describe, or a string table name.
198:  * @return array Fields in table. Keys are name and type
199:  * @throws CakeException
200:  */
201:     public function describe($model) {
202:         $table = $this->fullTableName($model, false, false);
203:         $fulltable = $this->fullTableName($model, false, true);
204: 
205:         $cache = parent::describe($fulltable);
206:         if ($cache) {
207:             return $cache;
208:         }
209: 
210:         $fields = array();
211:         $schema = is_object($model) ? $model->schemaName : false;
212: 
213:         $cols = $this->_execute(
214:             "SELECT
215:                 COLUMN_NAME as Field,
216:                 DATA_TYPE as Type,
217:                 COL_LENGTH('" . ($schema ? $fulltable : $table) . "', COLUMN_NAME) as Length,
218:                 IS_NULLABLE As [Null],
219:                 COLUMN_DEFAULT as [Default],
220:                 COLUMNPROPERTY(OBJECT_ID('" . ($schema ? $fulltable : $table) . "'), COLUMN_NAME, 'IsIdentity') as [Key],
221:                 NUMERIC_SCALE as Size
222:             FROM INFORMATION_SCHEMA.COLUMNS
223:             WHERE TABLE_NAME = '" . $table . "'" . ($schema ? " AND TABLE_SCHEMA = '" . $schema . "'" : '')
224:         );
225: 
226:         if (!$cols) {
227:             throw new CakeException(__d('cake_dev', 'Could not describe table for %s', $table));
228:         }
229: 
230:         while ($column = $cols->fetch(PDO::FETCH_OBJ)) {
231:             $field = $column->Field;
232:             $fields[$field] = array(
233:                 'type' => $this->column($column),
234:                 'null' => ($column->Null === 'YES' ? true : false),
235:                 'default' => $column->Default,
236:                 'length' => $this->length($column),
237:                 'key' => ($column->Key == '1') ? 'primary' : false
238:             );
239: 
240:             if ($fields[$field]['default'] === 'null') {
241:                 $fields[$field]['default'] = null;
242:             }
243:             if ($fields[$field]['default'] !== null) {
244:                 $fields[$field]['default'] = preg_replace(
245:                     "/^[(]{1,2}'?([^')]*)?'?[)]{1,2}$/",
246:                     "$1",
247:                     $fields[$field]['default']
248:                 );
249:                 $this->value($fields[$field]['default'], $fields[$field]['type']);
250:             }
251: 
252:             if ($fields[$field]['key'] !== false && $fields[$field]['type'] === 'integer') {
253:                 $fields[$field]['length'] = 11;
254:             } elseif ($fields[$field]['key'] === false) {
255:                 unset($fields[$field]['key']);
256:             }
257:             if (in_array($fields[$field]['type'], array('date', 'time', 'datetime', 'timestamp'))) {
258:                 $fields[$field]['length'] = null;
259:             }
260:             if ($fields[$field]['type'] === 'float' && !empty($column->Size)) {
261:                 $fields[$field]['length'] = $fields[$field]['length'] . ',' . $column->Size;
262:             }
263:         }
264:         $this->_cacheDescription($table, $fields);
265:         $cols->closeCursor();
266:         return $fields;
267:     }
268: 
269: /**
270:  * Generates the fields list of an SQL query.
271:  *
272:  * @param Model $model The model to get fields for.
273:  * @param string $alias Alias table name
274:  * @param array $fields The fields so far.
275:  * @param bool $quote Whether or not to quote identfiers.
276:  * @return array
277:  */
278:     public function fields(Model $model, $alias = null, $fields = array(), $quote = true) {
279:         if (empty($alias)) {
280:             $alias = $model->alias;
281:         }
282:         $fields = parent::fields($model, $alias, $fields, false);
283:         $count = count($fields);
284: 
285:         if ($count >= 1 && strpos($fields[0], 'COUNT(*)') === false) {
286:             $result = array();
287:             for ($i = 0; $i < $count; $i++) {
288:                 $prepend = '';
289: 
290:                 if (strpos($fields[$i], 'DISTINCT') !== false && strpos($fields[$i], 'COUNT') === false) {
291:                     $prepend = 'DISTINCT ';
292:                     $fields[$i] = trim(str_replace('DISTINCT', '', $fields[$i]));
293:                 }
294: 
295:                 if (!preg_match('/\s+AS\s+/i', $fields[$i])) {
296:                     if (substr($fields[$i], -1) === '*') {
297:                         if (strpos($fields[$i], '.') !== false && $fields[$i] != $alias . '.*') {
298:                             $build = explode('.', $fields[$i]);
299:                             $AssociatedModel = $model->{$build[0]};
300:                         } else {
301:                             $AssociatedModel = $model;
302:                         }
303: 
304:                         $_fields = $this->fields($AssociatedModel, $AssociatedModel->alias, array_keys($AssociatedModel->schema()));
305:                         $result = array_merge($result, $_fields);
306:                         continue;
307:                     }
308: 
309:                     if (strpos($fields[$i], '.') === false) {
310:                         $this->_fieldMappings[$alias . '__' . $fields[$i]] = $alias . '.' . $fields[$i];
311:                         $fieldName = $this->name($alias . '.' . $fields[$i]);
312:                         $fieldAlias = $this->name($alias . '__' . $fields[$i]);
313:                     } else {
314:                         $build = explode('.', $fields[$i]);
315:                         $build[0] = trim($build[0], '[]');
316:                         $build[1] = trim($build[1], '[]');
317:                         $name = $build[0] . '.' . $build[1];
318:                         $alias = $build[0] . '__' . $build[1];
319: 
320:                         $this->_fieldMappings[$alias] = $name;
321:                         $fieldName = $this->name($name);
322:                         $fieldAlias = $this->name($alias);
323:                     }
324:                     if ($model->getColumnType($fields[$i]) === 'datetime') {
325:                         $fieldName = "CONVERT(VARCHAR(20), {$fieldName}, 20)";
326:                     }
327:                     $fields[$i] = "{$fieldName} AS {$fieldAlias}";
328:                 }
329:                 $result[] = $prepend . $fields[$i];
330:             }
331:             return $result;
332:         }
333:         return $fields;
334:     }
335: 
336: /**
337:  * Generates and executes an SQL INSERT statement for given model, fields, and values.
338:  * Removes Identity (primary key) column from update data before returning to parent, if
339:  * value is empty.
340:  *
341:  * @param Model $model The model to insert into.
342:  * @param array $fields The fields to set.
343:  * @param array $values The values to set.
344:  * @return array
345:  */
346:     public function create(Model $model, $fields = null, $values = null) {
347:         if (!empty($values)) {
348:             $fields = array_combine($fields, $values);
349:         }
350:         $primaryKey = $this->_getPrimaryKey($model);
351: 
352:         if (array_key_exists($primaryKey, $fields)) {
353:             if (empty($fields[$primaryKey])) {
354:                 unset($fields[$primaryKey]);
355:             } else {
356:                 $this->_execute('SET IDENTITY_INSERT ' . $this->fullTableName($model) . ' ON');
357:             }
358:         }
359:         $result = parent::create($model, array_keys($fields), array_values($fields));
360:         if (array_key_exists($primaryKey, $fields) && !empty($fields[$primaryKey])) {
361:             $this->_execute('SET IDENTITY_INSERT ' . $this->fullTableName($model) . ' OFF');
362:         }
363:         return $result;
364:     }
365: 
366: /**
367:  * Generates and executes an SQL UPDATE statement for given model, fields, and values.
368:  * Removes Identity (primary key) column from update data before returning to parent.
369:  *
370:  * @param Model $model The model to update.
371:  * @param array $fields The fields to set.
372:  * @param array $values The values to set.
373:  * @param mixed $conditions The conditions to use.
374:  * @return array
375:  */
376:     public function update(Model $model, $fields = array(), $values = null, $conditions = null) {
377:         if (!empty($values)) {
378:             $fields = array_combine($fields, $values);
379:         }
380:         if (isset($fields[$model->primaryKey])) {
381:             unset($fields[$model->primaryKey]);
382:         }
383:         if (empty($fields)) {
384:             return true;
385:         }
386:         return parent::update($model, array_keys($fields), array_values($fields), $conditions);
387:     }
388: 
389: /**
390:  * Returns a limit statement in the correct format for the particular database.
391:  *
392:  * @param int $limit Limit of results returned
393:  * @param int $offset Offset from which to start results
394:  * @return string SQL limit/offset statement
395:  */
396:     public function limit($limit, $offset = null) {
397:         if ($limit) {
398:             $rt = '';
399:             if (!strpos(strtolower($limit), 'top') || strpos(strtolower($limit), 'top') === 0) {
400:                 $rt = ' TOP';
401:             }
402:             $rt .= sprintf(' %u', $limit);
403:             if (is_int($offset) && $offset > 0) {
404:                 $rt = sprintf(' OFFSET %u ROWS FETCH FIRST %u ROWS ONLY', $offset, $limit);
405:             }
406:             return $rt;
407:         }
408:         return null;
409:     }
410: 
411: /**
412:  * Converts database-layer column types to basic types
413:  *
414:  * @param mixed $real Either the string value of the fields type.
415:  *    or the Result object from Sqlserver::describe()
416:  * @return string Abstract column type (i.e. "string")
417:  */
418:     public function column($real) {
419:         $limit = null;
420:         $col = $real;
421:         if (is_object($real) && isset($real->Field)) {
422:             $limit = $real->Length;
423:             $col = $real->Type;
424:         }
425: 
426:         if ($col === 'datetime2') {
427:             return 'datetime';
428:         }
429:         if (in_array($col, array('date', 'time', 'datetime', 'timestamp'))) {
430:             return $col;
431:         }
432:         if ($col === 'bit') {
433:             return 'boolean';
434:         }
435:         if (strpos($col, 'bigint') !== false) {
436:             return 'biginteger';
437:         }
438:         if (strpos($col, 'int') !== false) {
439:             return 'integer';
440:         }
441:         if (strpos($col, 'char') !== false && $limit == -1) {
442:             return 'text';
443:         }
444:         if (strpos($col, 'char') !== false) {
445:             return 'string';
446:         }
447:         if (strpos($col, 'text') !== false) {
448:             return 'text';
449:         }
450:         if (strpos($col, 'binary') !== false || $col === 'image') {
451:             return 'binary';
452:         }
453:         if (in_array($col, array('float', 'real'))) {
454:             return 'float';
455:         }
456:         if (in_array($col, array('decimal', 'numeric'))) {
457:             return 'decimal';
458:         }
459:         return 'text';
460:     }
461: 
462: /**
463:  * Handle SQLServer specific length properties.
464:  * SQLServer handles text types as nvarchar/varchar with a length of -1.
465:  *
466:  * @param mixed $length Either the length as a string, or a Column descriptor object.
467:  * @return mixed null|integer with length of column.
468:  */
469:     public function length($length) {
470:         if (is_object($length) && isset($length->Length)) {
471:             if ($length->Length == -1 && strpos($length->Type, 'char') !== false) {
472:                 return null;
473:             }
474:             if (in_array($length->Type, array('nchar', 'nvarchar'))) {
475:                 return floor($length->Length / 2);
476:             }
477:             return $length->Length;
478:         }
479:         return parent::length($length);
480:     }
481: 
482: /**
483:  * Builds a map of the columns contained in a result
484:  *
485:  * @param PDOStatement $results The result to modify.
486:  * @return void
487:  */
488:     public function resultSet($results) {
489:         $this->map = array();
490:         $numFields = $results->columnCount();
491:         $index = 0;
492: 
493:         while ($numFields-- > 0) {
494:             $column = $results->getColumnMeta($index);
495:             $name = $column['name'];
496: 
497:             if (strpos($name, '__')) {
498:                 if (isset($this->_fieldMappings[$name]) && strpos($this->_fieldMappings[$name], '.')) {
499:                     $map = explode('.', $this->_fieldMappings[$name]);
500:                 } elseif (isset($this->_fieldMappings[$name])) {
501:                     $map = array(0, $this->_fieldMappings[$name]);
502:                 } else {
503:                     $map = array(0, $name);
504:                 }
505:             } else {
506:                 $map = array(0, $name);
507:             }
508:             $map[] = ($column['sqlsrv:decl_type'] === 'bit') ? 'boolean' : $column['native_type'];
509:             $this->map[$index++] = $map;
510:         }
511:     }
512: 
513: /**
514:  * Builds final SQL statement
515:  *
516:  * @param string $type Query type
517:  * @param array $data Query data
518:  * @return string
519:  */
520:     public function renderStatement($type, $data) {
521:         switch (strtolower($type)) {
522:             case 'select':
523:                 extract($data);
524:                 $fields = trim($fields);
525: 
526:                 if (strpos($limit, 'TOP') !== false && strpos($fields, 'DISTINCT ') === 0) {
527:                     $limit = 'DISTINCT ' . trim($limit);
528:                     $fields = substr($fields, 9);
529:                 }
530: 
531:                 // hack order as SQLServer requires an order if there is a limit.
532:                 if ($limit && !$order) {
533:                     $order = 'ORDER BY (SELECT NULL)';
534:                 }
535: 
536:                 // For older versions use the subquery version of pagination.
537:                 if (version_compare($this->getVersion(), '11', '<') && preg_match('/FETCH\sFIRST\s+([0-9]+)/i', $limit, $offset)) {
538:                     preg_match('/OFFSET\s*(\d+)\s*.*?(\d+)\s*ROWS/', $limit, $limitOffset);
539: 
540:                     $limit = 'TOP ' . (int)$limitOffset[2];
541:                     $page = (int)($limitOffset[1] / $limitOffset[2]);
542:                     $offset = (int)($limitOffset[2] * $page);
543: 
544:                     $rowCounter = self::ROW_COUNTER;
545:                     $sql = "SELECT {$limit} * FROM (
546:                             SELECT {$fields}, ROW_NUMBER() OVER ({$order}) AS {$rowCounter}
547:                             FROM {$table} {$alias} {$joins} {$conditions} {$group}
548:                         ) AS _cake_paging_
549:                         WHERE _cake_paging_.{$rowCounter} > {$offset}
550:                         ORDER BY _cake_paging_.{$rowCounter}
551:                     ";
552:                     return trim($sql);
553:                 }
554:                 if (strpos($limit, 'FETCH') !== false) {
555:                     return trim("SELECT {$fields} FROM {$table} {$alias} {$joins} {$conditions} {$group} {$order} {$limit}");
556:                 }
557:                 return trim("SELECT {$limit} {$fields} FROM {$table} {$alias} {$joins} {$conditions} {$group} {$order}");
558:             case "schema":
559:                 extract($data);
560: 
561:                 foreach ($indexes as $i => $index) {
562:                     if (preg_match('/PRIMARY KEY/', $index)) {
563:                         unset($indexes[$i]);
564:                         break;
565:                     }
566:                 }
567: 
568:                 foreach (array('columns', 'indexes') as $var) {
569:                     if (is_array(${$var})) {
570:                         ${$var} = "\t" . implode(",\n\t", array_filter(${$var}));
571:                     }
572:                 }
573:                 return trim("CREATE TABLE {$table} (\n{$columns});\n{$indexes}");
574:             default:
575:                 return parent::renderStatement($type, $data);
576:         }
577:     }
578: 
579: /**
580:  * Returns a quoted and escaped string of $data for use in an SQL statement.
581:  *
582:  * @param string $data String to be prepared for use in an SQL statement
583:  * @param string $column The column into which this data will be inserted
584:  * @return string Quoted and escaped data
585:  */
586:     public function value($data, $column = null) {
587:         if ($data === null || is_array($data) || is_object($data)) {
588:             return parent::value($data, $column);
589:         }
590:         if (in_array($data, array('{$__cakeID__$}', '{$__cakeForeignKey__$}'), true)) {
591:             return $data;
592:         }
593: 
594:         if (empty($column)) {
595:             $column = $this->introspectType($data);
596:         }
597: 
598:         switch ($column) {
599:             case 'string':
600:             case 'text':
601:                 return 'N' . $this->_connection->quote($data, PDO::PARAM_STR);
602:             default:
603:                 return parent::value($data, $column);
604:         }
605:     }
606: 
607: /**
608:  * Returns an array of all result rows for a given SQL query.
609:  * Returns false if no rows matched.
610:  *
611:  * @param Model $model The model to read from
612:  * @param array $queryData The query data
613:  * @param int $recursive How many layers to go.
614:  * @return array|false Array of resultset rows, or false if no rows matched
615:  */
616:     public function read(Model $model, $queryData = array(), $recursive = null) {
617:         $results = parent::read($model, $queryData, $recursive);
618:         $this->_fieldMappings = array();
619:         return $results;
620:     }
621: 
622: /**
623:  * Fetches the next row from the current result set.
624:  * Eats the magic ROW_COUNTER variable.
625:  *
626:  * @return mixed
627:  */
628:     public function fetchResult() {
629:         if ($row = $this->_result->fetch(PDO::FETCH_NUM)) {
630:             $resultRow = array();
631:             foreach ($this->map as $col => $meta) {
632:                 list($table, $column, $type) = $meta;
633:                 if ($table === 0 && $column === self::ROW_COUNTER) {
634:                     continue;
635:                 }
636:                 $resultRow[$table][$column] = $row[$col];
637:                 if ($type === 'boolean' && $row[$col] !== null) {
638:                     $resultRow[$table][$column] = $this->boolean($resultRow[$table][$column]);
639:                 }
640:             }
641:             return $resultRow;
642:         }
643:         $this->_result->closeCursor();
644:         return false;
645:     }
646: 
647: /**
648:  * Inserts multiple values into a table
649:  *
650:  * @param string $table The table to insert into.
651:  * @param string $fields The fields to set.
652:  * @param array $values The values to set.
653:  * @return void
654:  */
655:     public function insertMulti($table, $fields, $values) {
656:         $primaryKey = $this->_getPrimaryKey($table);
657:         $hasPrimaryKey = $primaryKey && (
658:             (is_array($fields) && in_array($primaryKey, $fields)
659:             || (is_string($fields) && strpos($fields, $this->startQuote . $primaryKey . $this->endQuote) !== false))
660:         );
661: 
662:         if ($hasPrimaryKey) {
663:             $this->_execute('SET IDENTITY_INSERT ' . $this->fullTableName($table) . ' ON');
664:         }
665: 
666:         parent::insertMulti($table, $fields, $values);
667: 
668:         if ($hasPrimaryKey) {
669:             $this->_execute('SET IDENTITY_INSERT ' . $this->fullTableName($table) . ' OFF');
670:         }
671:     }
672: 
673: /**
674:  * Generate a database-native column schema string
675:  *
676:  * @param array $column An array structured like the
677:  *   following: array('name'=>'value', 'type'=>'value'[, options]),
678:  *   where options can be 'default', 'length', or 'key'.
679:  * @return string
680:  */
681:     public function buildColumn($column) {
682:         $result = parent::buildColumn($column);
683:         $result = preg_replace('/(bigint|int|integer)\([0-9]+\)/i', '$1', $result);
684:         $result = preg_replace('/(bit)\([0-9]+\)/i', '$1', $result);
685:         if (strpos($result, 'DEFAULT NULL') !== false) {
686:             if (isset($column['default']) && $column['default'] === '') {
687:                 $result = str_replace('DEFAULT NULL', "DEFAULT ''", $result);
688:             } else {
689:                 $result = str_replace('DEFAULT NULL', 'NULL', $result);
690:             }
691:         } elseif (array_keys($column) === array('type', 'name')) {
692:             $result .= ' NULL';
693:         } elseif (strpos($result, "DEFAULT N'")) {
694:             $result = str_replace("DEFAULT N'", "DEFAULT '", $result);
695:         }
696:         return $result;
697:     }
698: 
699: /**
700:  * Format indexes for create table
701:  *
702:  * @param array $indexes The indexes to build
703:  * @param string $table The table to make indexes for.
704:  * @return string
705:  */
706:     public function buildIndex($indexes, $table = null) {
707:         $join = array();
708: 
709:         foreach ($indexes as $name => $value) {
710:             if ($name === 'PRIMARY') {
711:                 $join[] = 'PRIMARY KEY (' . $this->name($value['column']) . ')';
712:             } elseif (isset($value['unique']) && $value['unique']) {
713:                 $out = "ALTER TABLE {$table} ADD CONSTRAINT {$name} UNIQUE";
714: 
715:                 if (is_array($value['column'])) {
716:                     $value['column'] = implode(', ', array_map(array(&$this, 'name'), $value['column']));
717:                 } else {
718:                     $value['column'] = $this->name($value['column']);
719:                 }
720:                 $out .= "({$value['column']});";
721:                 $join[] = $out;
722:             }
723:         }
724:         return $join;
725:     }
726: 
727: /**
728:  * Makes sure it will return the primary key
729:  *
730:  * @param Model|string $model Model instance of table name
731:  * @return string
732:  */
733:     protected function _getPrimaryKey($model) {
734:         $schema = $this->describe($model);
735:         foreach ($schema as $field => $props) {
736:             if (isset($props['key']) && $props['key'] === 'primary') {
737:                 return $field;
738:             }
739:         }
740:         return null;
741:     }
742: 
743: /**
744:  * Returns number of affected rows in previous database operation. If no previous operation exists,
745:  * this returns false.
746:  *
747:  * @param mixed $source Unused
748:  * @return int Number of affected rows
749:  */
750:     public function lastAffected($source = null) {
751:         $affected = parent::lastAffected();
752:         if ($affected === null && $this->_lastAffected !== false) {
753:             return $this->_lastAffected;
754:         }
755:         return $affected;
756:     }
757: 
758: /**
759:  * Executes given SQL statement.
760:  *
761:  * @param string $sql SQL statement
762:  * @param array $params list of params to be bound to query (supported only in select)
763:  * @param array $prepareOptions Options to be used in the prepare statement
764:  * @return mixed PDOStatement if query executes with no problem, true as the result of a successful, false on error
765:  * query returning no rows, such as a CREATE statement, false otherwise
766:  * @throws PDOException
767:  */
768:     protected function _execute($sql, $params = array(), $prepareOptions = array()) {
769:         $this->_lastAffected = false;
770:         $sql = trim($sql);
771:         if (strncasecmp($sql, 'SELECT', 6) === 0 || preg_match('/^EXEC(?:UTE)?\s/mi', $sql) > 0) {
772:             $prepareOptions += array(PDO::ATTR_CURSOR => PDO::CURSOR_SCROLL);
773:             return parent::_execute($sql, $params, $prepareOptions);
774:         }
775:         try {
776:             $this->_lastAffected = $this->_connection->exec($sql);
777:             if ($this->_lastAffected === false) {
778:                 $this->_results = null;
779:                 $error = $this->_connection->errorInfo();
780:                 $this->error = $error[2];
781:                 return false;
782:             }
783:             return true;
784:         } catch (PDOException $e) {
785:             if (isset($query->queryString)) {
786:                 $e->queryString = $query->queryString;
787:             } else {
788:                 $e->queryString = $sql;
789:             }
790:             throw $e;
791:         }
792:     }
793: 
794: /**
795:  * Generate a "drop table" statement for the given table
796:  *
797:  * @param type $table Name of the table to drop
798:  * @return string Drop table SQL statement
799:  */
800:     protected function _dropTable($table) {
801:         return "IF OBJECT_ID('" . $this->fullTableName($table, false) . "', 'U') IS NOT NULL DROP TABLE " . $this->fullTableName($table) . ";";
802:     }
803: 
804: /**
805:  * Gets the schema name
806:  *
807:  * @return string The schema name
808:  */
809:     public function getSchemaName() {
810:         return $this->config['schema'];
811:     }
812: 
813: }
814: