-
Notifications
You must be signed in to change notification settings - Fork 821
/
DataQuery.php
749 lines (647 loc) · 22.1 KB
/
DataQuery.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
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
<?php
/**
* An object representing a query of data from the DataObject's supporting database.
* Acts as a wrapper over {@link SQLQuery} and performs all of the query generation.
* Used extensively by {@link DataList}.
*
* @subpackage model
* @package framework
*/
class DataQuery {
/**
* @var String
*/
protected $dataClass;
/**
* @var SQLQuery
*/
protected $query;
/**
* @var array
*/
protected $collidingFields = array();
private $queriedColumns = null;
/**
* @var Boolean
*/
private $queryFinalised = false;
// TODO: replace subclass_access with this
protected $querySubclasses = true;
// TODO: replace restrictclasses with this
protected $filterByClassName = true;
/**
* Create a new DataQuery.
*
* @param String The name of the DataObject class that you wish to query
*/
function __construct($dataClass) {
$this->dataClass = $dataClass;
$this->initialiseQuery();
}
/**
* Clone this object
*/
function __clone() {
$this->query = clone $this->query;
}
/**
* Return the {@link DataObject} class that is being queried.
*/
function dataClass() {
return $this->dataClass;
}
/**
* Return the {@link SQLQuery} object that represents the current query; note that it will
* be a clone of the object.
*/
function query() {
return $this->getFinalisedQuery();
}
/**
* Remove a filter from the query
*/
function removeFilterOn($fieldExpression) {
$matched = false;
$where = $this->query->getWhere();
foreach($where as $i => $clause) {
if(strpos($clause, $fieldExpression) !== false) {
unset($where[$i]);
$matched = true;
}
}
// set the entire where clause back, but clear the original one first
if($matched) {
$this->query->setWhere($where);
} else {
throw new InvalidArgumentException("Couldn't find $fieldExpression in the query filter.");
}
return $this;
}
/**
* Set up the simplest initial query
*/
function initialiseQuery() {
// Get the tables to join to.
// Don't get any subclass tables - let lazy loading do that.
$tableClasses = ClassInfo::ancestry($this->dataClass, true);
// Error checking
if(!$tableClasses) {
if(!SS_ClassLoader::instance()->hasManifest()) {
user_error("DataObjects have been requested before the manifest is loaded. Please ensure you are not querying the database in _config.php.", E_USER_ERROR);
} else {
user_error("DataObject::buildSQL: Can't find data classes (classes linked to tables) for $this->dataClass. Please ensure you run dev/build after creating a new DataObject.", E_USER_ERROR);
}
}
$baseClass = array_shift($tableClasses);
// Build our intial query
$this->query = new SQLQuery(array());
$this->query->setDistinct(true);
if($sort = singleton($this->dataClass)->stat('default_sort')) {
$this->sort($sort);
}
$this->query->setFrom("\"$baseClass\"");
$obj = Injector::inst()->get($baseClass);
$obj->extend('augmentDataQueryCreation', $this->query, $this);
}
function setQueriedColumns($queriedColumns) {
$this->queriedColumns = $queriedColumns;
}
/**
* Ensure that the query is ready to execute.
*/
function getFinalisedQuery($queriedColumns = null) {
if(!$queriedColumns) $queriedColumns = $this->queriedColumns;
if($queriedColumns) {
$queriedColumns = array_merge($queriedColumns, array('Created', 'LastEdited', 'ClassName'));
}
$query = clone $this->query;
// Generate the list of tables to iterate over and the list of columns required by any existing where clauses.
// This second step is skipped if we're fetching the whole dataobject as any required columns will get selected
// regardless.
if($queriedColumns) {
$tableClasses = ClassInfo::dataClassesFor($this->dataClass);
foreach ($query->getWhere() as $where) {
// Check for just the column, in the form '"Column" = ?' and the form '"Table"."Column"' = ?
if (preg_match('/^"([^"]+)"/', $where, $matches) ||
preg_match('/^"([^"]+)"\."[^"]+"/', $where, $matches)) {
if (!in_array($matches[1], $queriedColumns)) $queriedColumns[] = $matches[1];
}
}
}
else $tableClasses = ClassInfo::ancestry($this->dataClass, true);
$tableNames = array_keys($tableClasses);
$baseClass = $tableNames[0];
// Iterate over the tables and check what we need to select from them. If any selects are made (or the table is
// required for a select)
foreach($tableClasses as $tableClass) {
$joinTable = false;
// If queriedColumns is set, then check if any of the fields are in this table.
if ($queriedColumns) {
$tableFields = DataObject::database_fields($tableClass);
$selectColumns = array();
// Look through columns specifically requested in query (or where clause)
foreach ($queriedColumns as $queriedColumn) {
if (array_key_exists($queriedColumn, $tableFields)) {
$selectColumns[] = $queriedColumn;
}
}
$this->selectColumnsFromTable($query, $tableClass, $selectColumns);
if ($selectColumns && $tableClass != $baseClass) {
$joinTable = true;
}
} else {
$this->selectColumnsFromTable($query, $tableClass);
if ($tableClass != $baseClass) $joinTable = true;
}
if ($joinTable) {
$query->addLeftJoin($tableClass, "\"$tableClass\".\"ID\" = \"$baseClass\".\"ID\"") ;
}
}
// Resolve colliding fields
if($this->collidingFields) {
foreach($this->collidingFields as $k => $collisions) {
$caseClauses = array();
foreach($collisions as $collision) {
if(preg_match('/^"([^"]+)"/', $collision, $matches)) {
$collisionBase = $matches[1];
$collisionClasses = ClassInfo::subclassesFor($collisionBase);
$collisionClasses = array_map(array(DB::getConn(), 'prepStringForDB'), $collisionClasses);
$caseClauses[] = "WHEN \"$baseClass\".\"ClassName\" IN ("
. implode(", ", $collisionClasses) . ") THEN $collision";
} else {
user_error("Bad collision item '$collision'", E_USER_WARNING);
}
}
$query->selectField("CASE " . implode( " ", $caseClauses) . " ELSE NULL END", $k);
}
}
if($this->filterByClassName) {
// If querying the base class, don't bother filtering on class name
if($this->dataClass != $baseClass) {
// Get the ClassName values to filter to
$classNames = ClassInfo::subclassesFor($this->dataClass);
if(!$classNames) user_error("DataList::create() Can't find data sub-classes for '$callerClass'");
$classNames = array_map(array(DB::getConn(), 'prepStringForDB'), $classNames);
$query->addWhere("\"$baseClass\".\"ClassName\" IN (" . implode(",", $classNames) . ")");
}
}
$query->selectField("\"$baseClass\".\"ID\"", "ID");
$query->selectField("CASE WHEN \"$baseClass\".\"ClassName\" IS NOT NULL THEN \"$baseClass\".\"ClassName\" ELSE '$baseClass' END", "RecordClassName");
// TODO: Versioned, Translatable, SiteTreeSubsites, etc, could probably be better implemented as subclasses of DataQuery
$obj = Injector::inst()->get(ClassInfo::baseDataClass($this->dataClass));
$obj->extend('augmentSQL', $query, $this);
$this->ensureSelectContainsOrderbyColumns($query);
return $query;
}
/**
* Ensure that if a query has an order by clause, those columns are present in the select.
*
* @param SQLQuery $query
* @return null
*/
protected function ensureSelectContainsOrderbyColumns($query, $originalSelect = array()) {
$tableClasses = ClassInfo::dataClassesFor($this->dataClass);
$baseClass = array_shift($tableClasses);
if($orderby = $query->getOrderBy()) {
foreach($orderby as $k => $dir) {
// don't touch functions in the ORDER BY or function calls
// selected as fields
if(strpos($k, '(') !== false) continue;
$col = str_replace('"', '', trim($k));
$parts = explode('.', $col);
// Pull through SortColumn references from the originalSelect variables
if(preg_match('/_SortColumn/', $col)) {
if(isset($originalSelect[$col])) $query->selectField($originalSelect[$col], $col);
continue;
}
if(count($parts) == 1) {
$databaseFields = DataObject::database_fields($baseClass);
// database_fields() doesn't return ID, so we need to
// manually add it here
$databaseFields['ID'] = true;
if(isset($databaseFields[$parts[0]])) {
$qualCol = "\"$baseClass\".\"{$parts[0]}\"";
// remove original sort
unset($orderby[$k]);
// add new columns sort
$orderby[$qualCol] = $dir;
} else {
$qualCol = "\"$parts[0]\"";
}
// To-do: Remove this if block once SQLQuery::$select has been refactored to store getSelect()
// format internally; then this check can be part of selectField()
$selects = $query->getSelect();
if(!isset($selects[$col]) && !in_array($qualCol, $selects)) {
$query->selectField($qualCol);
}
} else {
$qualCol = '"' . implode('"."', $parts) . '"';
// To-do: Remove this if block once SQLQuery::$select has been refactored to store getSelect()
// format internally; then this check can be part of selectField()
if(!in_array($qualCol, $query->getSelect())) {
$query->selectField($qualCol);
}
}
}
$query->setOrderBy($orderby);
}
}
/**
* Execute the query and return the result as {@link Query} object.
*/
function execute() {
return $this->getFinalisedQuery()->execute();
}
/**
* Return this query's SQL
*/
function sql() {
return $this->getFinalisedQuery()->sql();
}
/**
* Return the number of records in this query.
* Note that this will issue a separate SELECT COUNT() query.
*/
function count() {
$baseClass = ClassInfo::baseDataClass($this->dataClass);
return $this->getFinalisedQuery()->count("DISTINCT \"$baseClass\".\"ID\"");
}
/**
* Return the maximum value of the given field in this DataList
*
* @param String $field Unquoted database column name (will be escaped automatically)
*/
function max($field) {
return $this->aggregate(sprintf('MAX("%s")', Convert::raw2sql($field)));
}
/**
* Return the minimum value of the given field in this DataList
*
* @param String $field Unquoted database column name (will be escaped automatically)
*/
function min($field) {
return $this->aggregate(sprintf('MIN("%s")', Convert::raw2sql($field)));
}
/**
* Return the average value of the given field in this DataList
*
* @param String $field Unquoted database column name (will be escaped automatically)
*/
function avg($field) {
return $this->aggregate(sprintf('AVG("%s")', Convert::raw2sql($field)));
}
/**
* Return the sum of the values of the given field in this DataList
*
* @param String $field Unquoted database column name (will be escaped automatically)
*/
function sum($field) {
return $this->aggregate(sprintf('SUM("%s")', Convert::raw2sql($field)));
}
/**
* Runs a raw aggregate expression. Please handle escaping yourself
*/
function aggregate($expression) {
return $this->getFinalisedQuery()->aggregate($expression)->execute()->value();
}
/**
* Return the first row that would be returned by this full DataQuery
* Note that this will issue a separate SELECT ... LIMIT 1 query.
*/
function firstRow() {
return $this->getFinalisedQuery()->firstRow();
}
/**
* Return the last row that would be returned by this full DataQuery
* Note that this will issue a separate SELECT ... LIMIT query.
*/
function lastRow() {
return $this->getFinalisedQuery()->lastRow();
}
/**
* Update the SELECT clause of the query with the columns from the given table
*/
protected function selectColumnsFromTable(SQLQuery &$query, $tableClass, $columns = null) {
// Add SQL for multi-value fields
$databaseFields = DataObject::database_fields($tableClass);
$compositeFields = DataObject::composite_fields($tableClass, false);
if($databaseFields) foreach($databaseFields as $k => $v) {
if((is_null($columns) || in_array($k, $columns)) && !isset($compositeFields[$k])) {
// Update $collidingFields if necessary
if($expressionForField = $query->expressionForField($k)) {
if(!isset($this->collidingFields[$k])) $this->collidingFields[$k] = array($expressionForField);
$this->collidingFields[$k][] = "\"$tableClass\".\"$k\"";
} else {
$query->selectField("\"$tableClass\".\"$k\"", $k);
}
}
}
if($compositeFields) foreach($compositeFields as $k => $v) {
if((is_null($columns) || in_array($k, $columns)) && $v) {
$dbO = Object::create_from_string($v, $k);
$dbO->addToQuery($query);
}
}
}
/**
* Set the HAVING clause of this query
*
* @param String $having Escaped SQL statement
*/
function having($having) {
if($having) {
$clone = $this;
$clone->query->addHaving($having);
return $clone;
} else {
return $this;
}
}
/**
* Set the WHERE clause of this query.
* There are two different ways of doing this:
*
* <code>
* // the entire predicate as a single string
* $query->where("Column = 'Value'");
*
* // multiple predicates as an array
* $query->where(array("Column = 'Value'", "Column != 'Value'"));
* </code>
*
* @param string|array $where Predicate(s) to set, as escaped SQL statements.
*/
function where($filter) {
if($filter) {
$clone = $this;
$clone->query->addWhere($filter);
return $clone;
} else {
return $this;
}
}
/**
* Set a WHERE with OR.
*
* @example $dataQuery->whereAny(array("Monkey = 'Chimp'", "Color = 'Brown'"));
* @see where()
*
* @param array $filter Escaped SQL statement.
* @return DataQuery
*/
function whereAny($filter) {
if($filter) {
$clone = $this;
$clone->query->addWhereAny($filter);
return $clone;
} else {
return $this;
}
}
/**
* Set the ORDER BY clause of this query
*
* @see SQLQuery::orderby()
*
* @param String $sort Column to sort on (escaped SQL statement)
* @param String $direction Direction ("ASC" or "DESC", escaped SQL statement)
* @param Boolean $clear Clear existing values
* @return DataQuery
*/
function sort($sort = null, $direction = null, $clear = true) {
$clone = $this;
if($clear) {
$clone->query->setOrderBy($sort, $direction);
} else {
$clone->query->addOrderBy($sort, $direction);
}
return $clone;
}
/**
* Reverse order by clause
*
* @return DataQuery
*/
function reverseSort() {
$clone = $this;
$clone->query->reverseOrderBy();
return $clone;
}
/**
* Set the limit of this query.
*
* @param int $limit
* @param int $offset
*/
function limit($limit, $offset = 0) {
$clone = $this;
$clone->query->setLimit($limit, $offset);
return $clone;
}
/**
* Add a join clause to this query
* @deprecated 3.0 Use innerJoin() or leftJoin() instead.
*/
function join($join) {
Deprecation::notice('3.0', 'Use innerJoin() or leftJoin() instead.');
if($join) {
$clone = $this;
$clone->query->addFrom($join);
// TODO: This needs to be resolved for all databases
if(DB::getConn() instanceof MySQLDatabase) {
$from = $clone->query->getFrom();
$clone->query->setGroupBy(reset($from) . ".\"ID\"");
}
return $clone;
} else {
return $this;
}
}
/**
* Add an INNER JOIN clause to this query.
*
* @param String $table The unquoted table name to join to.
* @param String $onClause The filter for the join (escaped SQL statement)
* @param String $alias An optional alias name (unquoted)
*/
public function innerJoin($table, $onClause, $alias = null) {
if($table) {
$clone = $this;
$clone->query->addInnerJoin($table, $onClause, $alias);
return $clone;
} else {
return $this;
}
}
/**
* Add a LEFT JOIN clause to this query.
*
* @param String $table The unquoted table to join to.
* @param String $onClause The filter for the join (escaped SQL statement).
* @param String $alias An optional alias name (unquoted)
*/
public function leftJoin($table, $onClause, $alias = null) {
if($table) {
$clone = $this;
$clone->query->addLeftJoin($table, $onClause, $alias);
return $clone;
} else {
return $this;
}
}
/**
* Traverse the relationship fields, and add the table
* mappings to the query object state. This has to be called
* in any overloaded {@link SearchFilter->apply()} methods manually.
*
* @param String|array $relation The array/dot-syntax relation to follow
* @return The model class of the related item
*/
function applyRelation($relation) {
// NO-OP
if(!$relation) return $this->dataClass;
if(is_string($relation)) $relation = explode(".", $relation);
$modelClass = $this->dataClass;
foreach($relation as $rel) {
$model = singleton($modelClass);
if ($component = $model->has_one($rel)) {
if(!$this->query->isJoinedTo($component)) {
$foreignKey = $model->getReverseAssociation($component);
$this->query->addLeftJoin($component, "\"$component\".\"ID\" = \"{$modelClass}\".\"{$foreignKey}ID\"");
/**
* add join clause to the component's ancestry classes so that the search filter could search on its
* ancester fields.
*/
$ancestry = ClassInfo::ancestry($component, true);
if(!empty($ancestry)){
$ancestry = array_reverse($ancestry);
foreach($ancestry as $ancestor){
if($ancestor != $component){
$this->query->addInnerJoin($ancestor, "\"$component\".\"ID\" = \"$ancestor\".\"ID\"");
$component=$ancestor;
}
}
}
}
$modelClass = $component;
} elseif ($component = $model->has_many($rel)) {
if(!$this->query->isJoinedTo($component)) {
$ancestry = $model->getClassAncestry();
$foreignKey = $model->getRemoteJoinField($rel);
$this->query->addLeftJoin($component, "\"$component\".\"{$foreignKey}\" = \"{$ancestry[0]}\".\"ID\"");
/**
* add join clause to the component's ancestry classes so that the search filter could search on its
* ancestor fields.
*/
$ancestry = ClassInfo::ancestry($component, true);
if(!empty($ancestry)){
$ancestry = array_reverse($ancestry);
foreach($ancestry as $ancestor){
if($ancestor != $component){
$this->query->addInnerJoin($ancestor, "\"$component\".\"ID\" = \"$ancestor\".\"ID\"");
$component=$ancestor;
}
}
}
}
$modelClass = $component;
} elseif ($component = $model->many_many($rel)) {
list($parentClass, $componentClass, $parentField, $componentField, $relationTable) = $component;
$parentBaseClass = ClassInfo::baseDataClass($parentClass);
$componentBaseClass = ClassInfo::baseDataClass($componentClass);
$this->query->addInnerJoin($relationTable, "\"$relationTable\".\"$parentField\" = \"$parentBaseClass\".\"ID\"");
$this->query->addLeftJoin($componentBaseClass, "\"$relationTable\".\"$componentField\" = \"$componentBaseClass\".\"ID\"");
if(ClassInfo::hasTable($componentClass)) {
$this->query->addLeftJoin($componentClass, "\"$relationTable\".\"$componentField\" = \"$componentClass\".\"ID\"");
}
$modelClass = $componentClass;
}
}
return $modelClass;
}
/**
* Removes the result of query from this query.
*
* @param DataQuery $subtractQuery
* @param string $field
*/
public function subtract(DataQuery $subtractQuery, $field='ID') {
$subSelect= $subtractQuery->getFinalisedQuery();
$fieldExpression = $this->expressionForField($field, $subSelect);
$subSelect->setSelect(array());
$subSelect->selectField($fieldExpression, $field);
$this->where($this->expressionForField($field, $this).' NOT IN ('.$subSelect->sql().')');
return $this;
}
/**
* Select the given fields from the given table.
*
* @param String $table Unquoted table name (will be escaped automatically)
* @param Array $fields Database column names (will be escaped automatically)
*/
public function selectFromTable($table, $fields) {
$table = Convert::raw2sql($table);
$fieldExpressions = array_map(create_function('$item',
"return '\"$table\".\"' . Convert::raw2sql(\$item) . '\"';"), $fields);
$this->query->setSelect($fieldExpressions);
return $this;
}
/**
* Query the given field column from the database and return as an array.
*
* @param String $field See {@link expressionForField()}.
*/
public function column($field = 'ID') {
$query = $this->getFinalisedQuery(array($field));
$originalSelect = $query->getSelect();
$fieldExpression = $this->expressionForField($field, $query);
$query->setSelect(array());
$query->selectField($fieldExpression, $field);
$this->ensureSelectContainsOrderbyColumns($query, $originalSelect);
return $query->execute()->column($field);
}
/**
* @param String $field Select statement identifier, either the unquoted column name,
* the full composite SQL statement, or the alias set through {@link SQLQquery->selectField()}.
* @param SQLQuery $query
* @return String
*/
protected function expressionForField($field, $query) {
// Special case for ID
if($field == 'ID') {
$baseClass = ClassInfo::baseDataClass($this->dataClass);
return "\"$baseClass\".\"ID\"";
} else {
return $query->expressionForField($field);
}
}
/**
* Select the given field expressions.
*
* @param $fieldExpression String The field to select (escaped SQL statement)
* @param $alias String The alias of that field (escaped SQL statement)
*/
protected function selectField($fieldExpression, $alias = null) {
$this->query->selectField($fieldExpression, $alias);
}
//// QUERY PARAMS
/**
* An arbitrary store of query parameters that can be used by decorators.
* @todo This will probably be made obsolete if we have subclasses of DataList and/or DataQuery.
*/
private $queryParams;
/**
* Set an arbitrary query parameter, that can be used by decorators to add additional meta-data to the query.
* It's expected that the $key will be namespaced, e.g, 'Versioned.stage' instead of just 'stage'.
*/
function setQueryParam($key, $value) {
$this->queryParams[$key] = $value;
}
/**
* Set an arbitrary query parameter, that can be used by decorators to add additional meta-data to the query.
*/
function getQueryParam($key) {
if(isset($this->queryParams[$key])) return $this->queryParams[$key];
else return null;
}
}