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
|
<?php
namespace SMW\SQLStore\EntityStore;
use RuntimeException;
use SMW\DIContainer;
use SMW\MediaWiki\Connection\OptionsBuilder;
use SMW\Options;
use SMW\RequestOptions;
use SMW\SQLStore\PropertyTableDefinition as PropertyTableDef;
use SMW\SQLStore\SQLStore;
use SMWDataItem as DataItem;
/**
* @license GNU GPL v2
* @since 3.0
*
* @author mwjames
*/
class TraversalPropertyLookup {
/**
* @var SQLStore
*/
private $store;
/**
* @since 3.0
*
* @param SQLStore $store
*/
public function __construct( SQLStore $store ) {
$this->store = $store;
}
/**
* @see Store::getInProperties
*
* @since 3.0
*
* {@inheritDoc}
*/
public function fetchFromTable( PropertyTableDef $propertyTableDef, DataItem $dataItem, RequestOptions $requestOptions = null ) {
$connection = $this->store->getConnection( 'mw.db' );
if ( $dataItem instanceof DIContainer ) {
throw new RuntimeException( "DIContainer: " . $dataItem->getSerialization() );
}
// Potentially need to get more results, since options apply to union.
if ( $requestOptions !== null ) {
$subOptions = clone $requestOptions;
$subOptions->limit = $requestOptions->limit + $requestOptions->offset;
$subOptions->offset = 0;
} else {
$subOptions = null;
}
if ( !$propertyTableDef->isFixedPropertyTable() ) {
$cond = $this->getWhereConds( $dataItem );
$conditions = '';
// No sorting
$options = $this->store->getSQLOptions( $subOptions, '' );
// Avoid any limit or offset for the sub-query in order to find all
// incoming properties
unset( $options['LIMIT'] );
unset( $options['OFFSET'] );
// Ensure to group same IDs to reduce the amount of data transferred
// from the inner join
$options['GROUP BY'] = 'p_id';
$opt = OptionsBuilder::toString( $options );
$cond = ( $cond !== '' ? ' WHERE ' : '' ) . $cond;
// Use a subquery to match all possible IDs, no ORDER BY or DISTINCT to avoid
// a filesort
$from = $connection->tableName( SQLStore::ID_TABLE ) .
" INNER JOIN (" .
" SELECT p_id FROM " . $connection->tableName( $propertyTableDef->getName() ) .
" $cond $opt ) AS t1 ON t1.p_id=smw_id";
$conditions .= ( $conditions ? ' AND ' : ' ' ) .
" smw_iw!=" . $connection->addQuotes( SMW_SQL3_SMWIW_OUTDATED ) .
" AND smw_iw!=" . $connection->addQuotes( SMW_SQL3_SMWDELETEIW );
$conditions .= $this->store->getSQLConditions( $subOptions, 'smw_sortkey', 'smw_sortkey', $conditions !== '' );
$options = $this->store->getSQLOptions( $subOptions, '' ) + [ 'DISTINCT' ];
$result = $connection->select(
$from,
' smw_title,smw_sortkey,smw_iw',
$conditions,
__METHOD__,
$options
);
} else {
$from = $connection->tableName( $propertyTableDef->getName() ) . " AS t1";
$where = $this->getWhereConds( $dataItem );
$fields = $propertyTableDef->usesIdSubject() ? 's_id' : '*';
$result = $connection->select(
$from,
$fields,
$where,
__METHOD__,
[ 'LIMIT' => 1 ]
);
if ( $result->numRows() > 0 ) {
$res = new \stdClass;
$res->smw_title = $propertyTableDef->getFixedProperty();
$result = [ $res ];
}
}
return $result;
}
private function getWhereConds( $dataItem ) {
$where = '';
$connection = $this->store->getConnection( 'mw.db' );
if ( $dataItem !== null ) {
$dataItemHandler = $this->store->getDataItemHandlerForDIType( $dataItem->getDIType() );
foreach ( $dataItemHandler->getWhereConds( $dataItem ) as $fieldname => $value ) {
$where .= ( $where ? ' AND ' : '' ) . "$fieldname=" . $connection->addQuotes( $value );
}
}
return $where;
}
}
|
