-
Notifications
You must be signed in to change notification settings - Fork 25
/
MSSQLDatabase.php
719 lines (643 loc) · 25.5 KB
/
MSSQLDatabase.php
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
<?php
namespace SilverStripe\MSSQL;
use SilverStripe\Core\Config\Configurable;
use SilverStripe\Core\Injector\Injectable;
use SilverStripe\Core\ClassInfo;
use SilverStripe\ORM\ArrayList;
use SilverStripe\ORM\Connect\Database;
use SilverStripe\ORM\DataList;
use SilverStripe\ORM\DB;
use SilverStripe\ORM\DataObject;
use SilverStripe\ORM\PaginatedList;
use SilverStripe\ORM\Queries\SQLSelect;
/**
* Microsoft SQL Server 2008+ connector class.
*
* <h2>Connecting using Windows</h2>
*
* If you've got your website running on Windows, it's highly recommended you
* use Microsoft SQL Server Driver for PHP "sqlsrv".
*
* A complete guide to installing a Windows IIS + PHP + SQL Server web stack can be
* found here: http://doc.silverstripe.org/installation-on-windows-server-manual-iis
*
* @see http://sqlsrvphp.codeplex.com/
*
* <h2>Connecting using Linux or Mac OS X</h2>
*
* The following commands assume you used the default package manager
* to install PHP with the operating system.
*
* Debian, and Ubuntu:
* <code>apt-get install php5-sybase</code>
*
* Fedora, CentOS and RedHat:
* <code>yum install php-mssql</code>
*
* Mac OS X (MacPorts):
* <code>port install php5-mssql</code>
*
* These packages will install the mssql extension for PHP, as well
* as FreeTDS, which will let you connect to SQL Server.
*
* More information available in the SilverStripe developer wiki:
* @see http://doc.silverstripe.org/modules:mssql
* @see http://doc.silverstripe.org/installation-on-windows-server-manual-iis
*
* References:
* @see http://freetds.org
*/
class MSSQLDatabase extends Database
{
use Configurable;
use Injectable;
/**
* Words that will trigger an error if passed to a SQL Server fulltext search
*/
public static $noiseWords = array('about', '1', 'after', '2', 'all', 'also', '3', 'an', '4', 'and', '5', 'another', '6', 'any', '7', 'are', '8', 'as', '9', 'at', '0', 'be', '$', 'because', 'been', 'before', 'being', 'between', 'both', 'but', 'by', 'came', 'can', 'come', 'could', 'did', 'do', 'does', 'each', 'else', 'for', 'from', 'get', 'got', 'has', 'had', 'he', 'have', 'her', 'here', 'him', 'himself', 'his', 'how', 'if', 'in', 'into', 'is', 'it', 'its', 'just', 'like', 'make', 'many', 'me', 'might', 'more', 'most', 'much', 'must', 'my', 'never', 'no', 'now', 'of', 'on', 'only', 'or', 'other', 'our', 'out', 'over', 're', 'said', 'same', 'see', 'should', 'since', 'so', 'some', 'still', 'such', 'take', 'than', 'that', 'the', 'their', 'them', 'then', 'there', 'these', 'they', 'this', 'those', 'through', 'to', 'too', 'under', 'up', 'use', 'very', 'want', 'was', 'way', 'we', 'well', 'were', 'what', 'when', 'where', 'which', 'while', 'who', 'will', 'with', 'would', 'you', 'your', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z');
/**
* Transactions will work with FreeTDS, but not entirely with sqlsrv driver on Windows with MARS enabled.
* TODO:
* - after the test fails with open transaction, the transaction should be rolled back,
* otherwise other tests will break claiming that transaction is still open.
* - figure out SAVEPOINTS
* - READ ONLY transactions
*/
protected $supportsTransactions = true;
/**
* Cached flag to determine if full-text is enabled. This is set by
* {@link MSSQLDatabase::fullTextEnabled()}
*
* @var boolean
*/
protected $fullTextEnabled = null;
/**
* @var bool
*/
protected $transactionNesting = 0;
/**
* Set the default collation of the MSSQL nvarchar fields that we create.
* We don't apply this to the database as a whole, so that we can use unicode collations.
*
* @param string $collation
*/
public static function set_collation($collation)
{
static::config()->set('collation', $collation);
}
/**
* The default collation of the MSSQL nvarchar fields that we create.
* We don't apply this to the database as a whole, so that we can use
* unicode collations.
*
* @return string
*/
public static function get_collation()
{
return static::config()->get('collation');
}
/**
* Connect to a MS SQL database.
* @param array $parameters An map of parameters, which should include:
* - server: The server, eg, localhost
* - username: The username to log on with
* - password: The password to log on with
* - database: The database to connect to
* - windowsauthentication: Set to true to use windows authentication
* instead of username/password
*/
public function connect($parameters)
{
parent::connect($parameters);
// Configure the connection
$this->query('SET QUOTED_IDENTIFIER ON');
$this->query('SET TEXTSIZE 2147483647');
}
/**
* Checks whether the current SQL Server version has full-text
* support installed and full-text is enabled for this database.
*
* @return boolean
*/
public function fullTextEnabled()
{
if ($this->fullTextEnabled === null) {
$this->fullTextEnabled = $this->updateFullTextEnabled();
}
return $this->fullTextEnabled;
}
/**
* Checks whether the current SQL Server version has full-text
* support installed and full-text is enabled for this database.
*
* @return boolean
*/
protected function updateFullTextEnabled()
{
// Check if installed
$isInstalled = $this->query("SELECT fulltextserviceproperty('isfulltextinstalled')")->value();
if (!$isInstalled) {
return false;
}
// Check if current database is enabled
$database = $this->getSelectedDatabase();
$enabledForDb = $this->preparedQuery(
"SELECT is_fulltext_enabled FROM sys.databases WHERE name = ?",
array($database)
)->value();
return $enabledForDb;
}
public function supportsCollations()
{
return true;
}
public function supportsTimezoneOverride()
{
return true;
}
public function getDatabaseServer()
{
return "sqlsrv";
}
public function selectDatabase($name, $create = false, $errorLevel = E_USER_ERROR)
{
$this->fullTextEnabled = null;
return parent::selectDatabase($name, $create, $errorLevel);
}
public function clearTable($table)
{
$this->query("TRUNCATE TABLE \"$table\"");
}
/**
* SQL Server uses CURRENT_TIMESTAMP for the current date/time.
*/
public function now()
{
return 'CURRENT_TIMESTAMP';
}
/**
* Returns the database-specific version of the random() function
*/
public function random()
{
return 'RAND()';
}
/**
* The core search engine configuration.
* Picks up the fulltext-indexed tables from the database and executes search on all of them.
* Results are obtained as ID-ClassName pairs which is later used to reconstruct the DataObjectSet.
*
* @param array $classesToSearch computes all descendants and includes them. Check is done via WHERE clause.
* @param string $keywords Keywords as a space separated string
* @param int $start
* @param int $pageLength
* @param string $sortBy
* @param string $extraFilter
* @param bool $booleanSearch
* @param string $alternativeFileFilter
* @param bool $invertedMatch
* @return PaginatedList DataObjectSet of result pages
*/
public function searchEngine($classesToSearch, $keywords, $start, $pageLength, $sortBy = "Relevance DESC", $extraFilter = "", $booleanSearch = false, $alternativeFileFilter = "", $invertedMatch = false)
{
$start = (int)$start;
$pageLength = (int)$pageLength;
$results = new ArrayList();
if (!$this->fullTextEnabled()) {
return new PaginatedList($results);
}
if (!in_array(substr($sortBy, 0, 9), array('"Relevanc', 'Relevance'))) {
user_error("Non-relevance sort not supported.", E_USER_ERROR);
}
$allClassesToSearch = array();
foreach ($classesToSearch as $class) {
$allClassesToSearch = array_merge($allClassesToSearch, array_values(ClassInfo::dataClassesFor($class)));
}
$allClassesToSearch = array_unique($allClassesToSearch);
//Get a list of all the tables and columns we'll be searching on:
$fulltextColumns = $this->query('EXEC sp_help_fulltext_columns');
$queries = array();
// Sort the columns back into tables.
$tables = array();
foreach ($fulltextColumns as $column) {
// Skip extension tables.
if (substr($column['TABLE_NAME'], -5) == '_Live' || substr($column['TABLE_NAME'], -9) == '_versions') {
continue;
}
// Add the column to table.
$table = &$tables[$column['TABLE_NAME']];
if (!$table) {
$table = array($column['FULLTEXT_COLUMN_NAME']);
} else {
array_push($table, $column['FULLTEXT_COLUMN_NAME']);
}
}
// Create one query per each table, $columns not used. We want just the ID and the ClassName of the object from this query.
foreach ($tables as $tableName => $columns) {
$class = DataObject::getSchema()->tableClass($tableName);
$join = $this->fullTextSearchMSSQL($tableName, $keywords);
if (!$join) {
return new PaginatedList($results);
} // avoid "Null or empty full-text predicate"
// Check if we need to add ShowInSearch
$where = null;
if ($class === 'SilverStripe\\CMS\\Model\\SiteTree') {
$where = array("\"$tableName\".\"ShowInSearch\"!=0");
} elseif ($class === 'SilverStripe\\Assets\\File') {
// File.ShowInSearch was added later, keep the database driver backwards compatible
// by checking for its existence first
$fields = $this->getSchemaManager()->fieldList($tableName);
if (array_key_exists('ShowInSearch', $fields)) {
$where = array("\"$tableName\".\"ShowInSearch\"!=0");
}
}
$queries[$tableName] = DataList::create($class)->where($where)->dataQuery()->query();
$queries[$tableName]->setOrderBy(array());
// Join with CONTAINSTABLE, a full text searcher that includes relevance factor
$queries[$tableName]->setFrom(array("\"$tableName\" INNER JOIN $join AS \"ft\" ON \"$tableName\".\"ID\"=\"ft\".\"KEY\""));
// Join with the base class if needed, as we want to test agains the ClassName
if ($tableName != $tableName) {
$queries[$tableName]->setFrom("INNER JOIN \"$tableName\" ON \"$tableName\".\"ID\"=\"$tableName\".\"ID\"");
}
$queries[$tableName]->setSelect(array("\"$tableName\".\"ID\""));
$queries[$tableName]->selectField("'$tableName'", 'Source');
$queries[$tableName]->selectField('Rank', 'Relevance');
if ($extraFilter) {
$queries[$tableName]->addWhere($extraFilter);
}
if (count($allClassesToSearch)) {
$classesPlaceholder = DB::placeholders($allClassesToSearch);
$queries[$tableName]->addWhere(array(
"\"$tableName\".\"ClassName\" IN ($classesPlaceholder)" =>
$allClassesToSearch
));
}
// Reset the parameters that would get in the way
}
// Generate SQL
$querySQLs = array();
$queryParameters = array();
foreach ($queries as $query) {
/** @var SQLSelect $query */
$querySQLs[] = $query->sql($parameters);
$queryParameters = array_merge($queryParameters, $parameters);
}
// Unite the SQL
$fullQuery = implode(" UNION ", $querySQLs) . " ORDER BY $sortBy";
// Perform the search
$result = $this->preparedQuery($fullQuery, $queryParameters);
// Regenerate DataObjectSet - watch out, numRecords doesn't work on sqlsrv driver on Windows.
$current = -1;
$objects = array();
foreach ($result as $row) {
$current++;
// Select a subset for paging
if ($current >= $start && $current < $start + $pageLength) {
$objects[] = DataObject::get_by_id($row['Source'], $row['ID']);
}
}
if (isset($objects)) {
$results = new ArrayList($objects);
} else {
$results = new ArrayList();
}
$list = new PaginatedList($results);
$list->setPageStart($start);
$list->setPageLength($pageLength);
$list->setTotalItems($current+1);
return $list;
}
/**
* Allow auto-increment primary key editing on the given table.
* Some databases need to enable this specially.
*
* @param string $table The name of the table to have PK editing allowed on
* @param bool $allow True to start, false to finish
*/
public function allowPrimaryKeyEditing($table, $allow = true)
{
$this->query("SET IDENTITY_INSERT \"$table\" " . ($allow ? "ON" : "OFF"));
}
/**
* Returns a SQL fragment for querying a fulltext search index
*
* @param string $tableName specific - table name
* @param string $keywords The search query
* @param array $fields The list of field names to search on, or null to include all
* @return string Clause, or null if keyword set is empty or the string with JOIN clause to be added to SQL query
*/
public function fullTextSearchMSSQL($tableName, $keywords, $fields = null)
{
// Make sure we are getting an array of fields
if (isset($fields) && !is_array($fields)) {
$fields = array($fields);
}
// Strip unfriendly characters, SQLServer "CONTAINS" predicate will crash on & and | and ignore others anyway.
if (function_exists('mb_ereg_replace')) {
$keywords = mb_ereg_replace('[^\w\s]', '', trim($keywords));
} else {
$keywords = $this->escapeString(str_replace(array('&', '|', '!', '"', '\''), '', trim($keywords)));
}
// Remove stopwords, concat with ANDs
$keywordList = explode(' ', $keywords);
$keywordList = $this->removeStopwords($keywordList);
// remove any empty values from the array
$keywordList = array_filter($keywordList);
if (empty($keywordList)) {
return null;
}
$keywords = implode(' AND ', $keywordList);
if ($fields) {
$fieldNames = '"' . implode('", "', $fields) . '"';
} else {
$fieldNames = "*";
}
return "CONTAINSTABLE(\"$tableName\", ($fieldNames), '$keywords')";
}
/**
* Remove stopwords that would kill a MSSQL full-text query
*
* @param array $keywords
*
* @return array $keywords with stopwords removed
*/
public function removeStopwords($keywords)
{
$goodKeywords = array();
foreach ($keywords as $keyword) {
if (in_array($keyword, self::$noiseWords)) {
continue;
}
$goodKeywords[] = trim($keyword);
}
return $goodKeywords;
}
/**
* Does this database support transactions?
*/
public function supportsTransactions()
{
return $this->supportsTransactions;
}
/**
* This is a quick lookup to discover if the database supports particular extensions
* Currently, MSSQL supports no extensions
*
* @param array $extensions List of extensions to check for support of. The key of this array
* will be an extension name, and the value the configuration for that extension. This
* could be one of partitions, tablespaces, or clustering
* @return boolean Flag indicating support for all of the above
*/
public function supportsExtensions($extensions = array('partitions', 'tablespaces', 'clustering'))
{
if (isset($extensions['partitions'])) {
return false;
} elseif (isset($extensions['tablespaces'])) {
return false;
} elseif (isset($extensions['clustering'])) {
return false;
} else {
return false;
}
}
/**
* Start transaction. READ ONLY not supported.
*
* @param bool $transactionMode
* @param bool $sessionCharacteristics
*/
public function transactionStart($transactionMode = false, $sessionCharacteristics = false)
{
if ($this->transactionNesting > 0) {
$this->transactionSavepoint('NESTEDTRANSACTION' . $this->transactionNesting);
} elseif ($this->connector instanceof SQLServerConnector) {
$this->connector->transactionStart();
} else {
$this->query('BEGIN TRANSACTION');
}
++$this->transactionNesting;
}
public function transactionSavepoint($savepoint)
{
$this->query("SAVE TRANSACTION \"$savepoint\"");
}
public function transactionRollback($savepoint = false)
{
// Named transaction
if ($savepoint) {
$this->query("ROLLBACK TRANSACTION \"$savepoint\"");
return true;
}
// Fail if transaction isn't available
if (!$this->transactionNesting) {
return false;
}
--$this->transactionNesting;
if ($this->transactionNesting > 0) {
$this->transactionRollback('NESTEDTRANSACTION' . $this->transactionNesting);
} elseif ($this->connector instanceof SQLServerConnector) {
$this->connector->transactionRollback();
} else {
$this->query('ROLLBACK TRANSACTION');
}
return true;
}
public function transactionEnd($chain = false)
{
// Fail if transaction isn't available
if (!$this->transactionNesting) {
return false;
}
--$this->transactionNesting;
if ($this->transactionNesting <= 0) {
$this->transactionNesting = 0;
if ($this->connector instanceof SQLServerConnector) {
$this->connector->transactionEnd();
} else {
$this->query('COMMIT TRANSACTION');
}
}
return true;
}
/**
* In error condition, set transactionNesting to zero
*/
protected function resetTransactionNesting()
{
$this->transactionNesting = 0;
}
public function query($sql, $errorLevel = E_USER_ERROR)
{
$this->inspectQuery($sql);
return parent::query($sql, $errorLevel);
}
public function preparedQuery($sql, $parameters, $errorLevel = E_USER_ERROR)
{
$this->inspectQuery($sql);
return parent::preparedQuery($sql, $parameters, $errorLevel);
}
protected function inspectQuery($sql)
{
// Any DDL discards transactions.
$isDDL = $this->getConnector()->isQueryDDL($sql);
if ($isDDL) {
$this->resetTransactionNesting();
}
}
public function comparisonClause($field, $value, $exact = false, $negate = false, $caseSensitive = null, $parameterised = false)
{
if ($exact) {
$comp = ($negate) ? '!=' : '=';
} else {
$comp = 'LIKE';
if ($negate) {
$comp = 'NOT ' . $comp;
}
}
// Field definitions are case insensitive by default,
// change used collation for case sensitive searches.
$collateClause = '';
if ($caseSensitive === true) {
if (self::get_collation()) {
$collation = preg_replace('/_CI_/', '_CS_', self::get_collation());
} else {
$collation = 'Latin1_General_CS_AS';
}
$collateClause = ' COLLATE ' . $collation;
} elseif ($caseSensitive === false) {
if (self::get_collation()) {
$collation = preg_replace('/_CS_/', '_CI_', self::get_collation());
} else {
$collation = 'Latin1_General_CI_AS';
}
$collateClause = ' COLLATE ' . $collation;
}
$clause = sprintf("%s %s %s", $field, $comp, $parameterised ? '?' : "'$value'");
if ($collateClause) {
$clause .= $collateClause;
}
return $clause;
}
/**
* Function to return an SQL datetime expression for MSSQL
* used for querying a datetime in a certain format
*
* @param string $date to be formated, can be either 'now', literal datetime like '1973-10-14 10:30:00' or field name, e.g. '"SiteTree"."Created"'
* @param string $format to be used, supported specifiers:
* %Y = Year (four digits)
* %m = Month (01..12)
* %d = Day (01..31)
* %H = Hour (00..23)
* %i = Minutes (00..59)
* %s = Seconds (00..59)
* %U = unix timestamp, can only be used on it's own
* @return string SQL datetime expression to query for a formatted datetime
*/
public function formattedDatetimeClause($date, $format)
{
preg_match_all('/%(.)/', $format, $matches);
foreach ($matches[1] as $match) {
if (array_search($match, array('Y', 'm', 'd', 'H', 'i', 's', 'U')) === false) {
user_error('formattedDatetimeClause(): unsupported format character %' . $match, E_USER_WARNING);
}
}
if (preg_match('/^now$/i', $date)) {
$date = "CURRENT_TIMESTAMP";
} elseif (preg_match('/^\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}$/i', $date)) {
$date = "'$date.000'";
}
if ($format == '%U') {
return "DATEDIFF(s, '1970-01-01 00:00:00', DATEADD(hour, DATEDIFF(hour, GETDATE(), GETUTCDATE()), $date))";
}
$trans = array(
'Y' => 'yy',
'm' => 'mm',
'd' => 'dd',
'H' => 'hh',
'i' => 'mi',
's' => 'ss',
);
$strings = array();
$buffer = $format;
while (strlen($buffer)) {
if (substr($buffer, 0, 1) == '%') {
$f = substr($buffer, 1, 1);
$flen = $f == 'Y' ? 4 : 2;
$strings[] = "RIGHT('0' + CAST(DATEPART({$trans[$f]},$date) AS VARCHAR), $flen)";
$buffer = substr($buffer, 2);
} else {
$pos = strpos($buffer, '%');
if ($pos === false) {
$strings[] = $buffer;
$buffer = '';
} else {
$strings[] = "'".substr($buffer, 0, $pos)."'";
$buffer = substr($buffer, $pos);
}
}
}
return '(' . implode(' + ', $strings) . ')';
}
/**
* Function to return an SQL datetime expression for MSSQL.
* used for querying a datetime addition
*
* @param string $date, can be either 'now', literal datetime like '1973-10-14 10:30:00' or field name, e.g. '"SiteTree"."Created"'
* @param string $interval to be added, use the format [sign][integer] [qualifier], e.g. -1 Day, +15 minutes, +1 YEAR
* supported qualifiers:
* - years
* - months
* - days
* - hours
* - minutes
* - seconds
* This includes the singular forms as well
* @return string SQL datetime expression to query for a datetime (YYYY-MM-DD hh:mm:ss) which is the result of the addition
*/
public function datetimeIntervalClause($date, $interval)
{
$trans = array(
'year' => 'yy',
'month' => 'mm',
'day' => 'dd',
'hour' => 'hh',
'minute' => 'mi',
'second' => 'ss',
);
$singularinterval = preg_replace('/(year|month|day|hour|minute|second)s/i', '$1', $interval);
if (
!($params = preg_match('/([-+]\d+) (\w+)/i', $singularinterval, $matches)) ||
!isset($trans[strtolower($matches[2])])
) {
user_error('datetimeIntervalClause(): invalid interval ' . $interval, E_USER_WARNING);
}
if (preg_match('/^now$/i', $date)) {
$date = "CURRENT_TIMESTAMP";
} elseif (preg_match('/^\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}$/i', $date)) {
$date = "'$date'";
}
return "CONVERT(VARCHAR, DATEADD(" . $trans[strtolower($matches[2])] . ", " . (int)$matches[1] . ", $date), 120)";
}
/**
* Function to return an SQL datetime expression for MSSQL.
* used for querying a datetime substraction
*
* @param string $date1, can be either 'now', literal datetime like '1973-10-14 10:30:00' or field name, e.g. '"SiteTree"."Created"'
* @param string $date2 to be substracted of $date1, can be either 'now', literal datetime like '1973-10-14 10:30:00' or field name, e.g. '"SiteTree"."Created"'
* @return string SQL datetime expression to query for the interval between $date1 and $date2 in seconds which is the result of the substraction
*/
public function datetimeDifferenceClause($date1, $date2)
{
if (preg_match('/^now$/i', $date1)) {
$date1 = "CURRENT_TIMESTAMP";
} elseif (preg_match('/^\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}$/i', $date1)) {
$date1 = "'$date1'";
}
if (preg_match('/^now$/i', $date2)) {
$date2 = "CURRENT_TIMESTAMP";
} elseif (preg_match('/^\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}$/i', $date2)) {
$date2 = "'$date2'";
}
return "DATEDIFF(s, $date2, $date1)";
}
}