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<?php
namespace SMW\SQLStore\QueryEngine;
/**
* Class for representing a single (sub)query description.
*
* @license GPL-2.0-or-later
* @since 2.2
*
* @author Markus Krötzsch
* @author Jeroen De Dauw
*/
class QuerySegment {
/**
* Type of empty query without usable condition, dropped as soon as
* discovered. This is used only during preparing the query (no
* queries of this type should ever be added).
*/
const Q_NOQUERY = 0;
/**
* Type of query that is a join with a query (jointable: internal
* table name; joinfield/components/where use alias.fields;
* from uses external table names, components interpreted
* conjunctively (JOIN)).
*/
const Q_TABLE = 1;
/**
* Type of query that matches a constant value (joinfield is a
* disjunctive array of unquoted values, jointable empty, components
* empty).
*/
const Q_VALUE = 2;
/**
* Type of query that is a disjunction of other queries
* (joinfield/jointable empty; only components relevant)
*/
const Q_DISJUNCTION = 3;
/**
* Type of query that is a conjunction of other queries
* (joinfield/jointable empty; only components relevant).
*/
const Q_CONJUNCTION = 4;
/**
* Type of query that creates a temporary table of all superclasses
* of given classes (only joinfield relevant: (disjunctive) array of
* unquoted values).
*/
const Q_CLASS_HIERARCHY = 5;
/**
* Type of query that creates a temporary table of all superproperties
* of given properties (only joinfield relevant: (disjunctive) array
* of unquoted values).
*/
const Q_PROP_HIERARCHY = 6;
/**
* @var int
*/
public $type = self::Q_TABLE;
/**
* @var int|null
*/
public $depth;
/**
* @var string
*/
public $fingerprint = '';
/**
* @var bool
*/
public $null = false;
/**
* @var bool
*/
public $not = false;
/**
* @var string
* @note This should be only one of these values: 'LEFT', 'LEFT OUTER', 'INNER'.
*/
public $joinType = '';
/**
* @var string
*/
public $joinTable = '';
/**
* @var string|array
*/
public $joinfield = '';
/**
* Allows to define an index field, for example in case when a sub-query rewires
* a match condition.
*
* @var string
*/
public $indexField = '';
/**
* @var string
*/
public $from = '';
/**
* @var string[] Array of tables compatible with MediaWiki’s IReadableDatabase::select()
*
* The values are always the table names, and if the index is a string then it is its alias.
* It is not necessary to use $db->tableName() for the table names, this is handled by MediaWiki.
*
* Example:
* [ 'page', 't0' => 'smw_object_ids' ]
*/
public $fromTables = [];
/**
* @var string[][] Array of JOIN conditions created to be compatible with MediaWiki’s IReadableDatabase::select()
*
* The key in the first array must be a string, and represent the table or alias; the corresponding values
* are a list with index 0 and 1, where the value at index 0 is the the type of JOIN and the value at index 1
* is the condition.
* It is not necessary to use $db->tableName() for the table names, this is handled by MediaWiki.
*
*
* Example:
* [ 'page' => [ 'LEFT JOIN', 'page_latest=rev_id' ] ]
*/
public $joinConditions = [];
/**
* @var string
*/
public $where = '';
/**
* @var string
*/
public $sortIndexField;
/**
* @var string[]
*/
public $components = [];
/**
* The alias to be used for jointable; read-only after construct!
*
* @var string
*/
public $alias;
/**
* property dbkey => db field; passed down during query execution.
*
* @var string[]
*/
public $sortfields = [];
/**
* @var int
*/
public $queryNumber;
/**
* @var int
*/
public static $qnum = 0;
/**
* @since 2.2
*/
public function __construct() {
$this->queryNumber = self::$qnum;
$this->alias = 't' . self::$qnum;
self::$qnum++;
}
/**
* @since 2.2
*/
public function reset() {
self::$qnum = 0;
$this->queryNumber = self::$qnum;
$this->alias = 't' . self::$qnum;
self::$qnum++;
}
}