question_finder Class Reference

Class for loading questions according to various criteria. More...

Inheritance diagram for question_finder:

Public Member Functions
	get_questions_from_categories ($categoryids, $extraconditions, $extraparams=array())
	Get the ids of all the questions in a list of categories.
	get_questions_from_categories_and_tags_with_usage_counts ($categoryids, qubaid_condition $qubaids, $extraconditions='', $extraparams=array(), $tagids=array())
	Get the ids of all the questions in a list of categories that have ALL the provided tags, with the number of times they have already been used in a given set of usages.
	get_questions_from_categories_with_usage_counts ($categoryids, qubaid_condition $qubaids, $extraconditions='', $extraparams=array())
	Get the ids of all the questions in a list of categories, with the number of times they have already been used in a given set of usages.
	load_for_cache ($questionid)
	Loads the data for the key provided ready formatted for caching.
	load_many_for_cache (array $questionids)
	Loads several keys for the cache.
	load_question_data ($questionid)
	Load a question definition data from the database.
	uncache_question ($questionid)
	This method needs to be called whenever a question is edited.

Static Public Member Functions
static	get_instance ()
static	get_instance_for_cache (cache_definition $definition)
	Returns an instance of the data source class that the cache can use for loading data using the other methods specified by this interface.

Protected Member Functions
	get_data_cache ()

Static Protected Attributes
static question_finder	$questionfinder = null
	the singleton instance of this class.

Detailed Description

Class for loading questions according to various criteria.

Copyright

2009 The Open University

License

http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

Member Function Documentation

get_data_cache()

question_finder::get_data_cache ( )

protected

Return values

cache_application

the question definition cache we are using.

get_instance()

static question_finder::get_instance ( )

static

Return values

question_finder

a question finder.

get_instance_for_cache()

static question_finder::get_instance_for_cache ( cache_definition $definition )

static

Returns an instance of the data source class that the cache can use for loading data using the other methods specified by this interface.

Parameters

cache_definition

$definition

Return values

object

Implements cache_data_source.

get_questions_from_categories()

question_finder::get_questions_from_categories	(		$categoryids,
			$extraconditions,
			$extraparams = array() )

Get the ids of all the questions in a list of categories.

Parameters

array	$categoryids	either a category id, or a comma-separated list of category ids, or an array of them.
string	$extraconditions	extra conditions to AND with the rest of the where clause. Must use named parameters.
array	$extraparams	any parameters used by $extraconditions.

Return values

array

questionid => questionid.

get_questions_from_categories_and_tags_with_usage_counts()

question_finder::get_questions_from_categories_and_tags_with_usage_counts	(		$categoryids,
		qubaid_condition	$qubaids,
			$extraconditions = '',
			$extraparams = array(),
			$tagids = array() )

Get the ids of all the questions in a list of categories that have ALL the provided tags, with the number of times they have already been used in a given set of usages.

The result array is returned in order of increasing (count previous uses).

Parameters

array	$categoryids	an array of question_category ids.
qubaid_condition	$qubaids	which question_usages to count previous uses from.
string	$extraconditions	extra conditions to AND with the rest of the where clause. Must use named parameters.
array	$extraparams	any parameters used by $extraconditions.
array	$tagids	an array of tag ids

Return values

array

questionid => count of number of previous uses.

get_questions_from_categories_with_usage_counts()

question_finder::get_questions_from_categories_with_usage_counts	(		$categoryids,
		qubaid_condition	$qubaids,
			$extraconditions = '',
			$extraparams = array() )

Get the ids of all the questions in a list of categories, with the number of times they have already been used in a given set of usages.

The result array is returned in order of increasing (count previous uses).

Parameters

array	$categoryids	an array question_category ids.
qubaid_condition	$qubaids	which question_usages to count previous uses from.
string	$extraconditions	extra conditions to AND with the rest of the where clause. Must use named parameters.
array	$extraparams	any parameters used by $extraconditions.

Return values

array

questionid => count of number of previous uses.

load_for_cache()

question_finder::load_for_cache

(

$key

)

Loads the data for the key provided ready formatted for caching.

Parameters

string | int

$key

The key to load.

Return values

mixed

What ever data should be returned, or false if it can't be loaded.

Implements cache_data_source.

load_many_for_cache()

question_finder::load_many_for_cache

(

array

$keys

)

Loads several keys for the cache.

Parameters

array

$keys

An array of keys each of which will be string|int.

Return values

array

An array of matching data items.

Implements cache_data_source.

load_question_data()

question_finder::load_question_data

(

$questionid

)

Load a question definition data from the database.

The data will be returned as a plain stdClass object.

Parameters

int

$questionid

the id of the question to load.

Return values

object

question definition loaded from the database.

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The documentation for this class was generated from the following file:

• question/engine/bank.php