qubaid_condition Class Reference

Inheritance diagram for qubaid_condition:

Public Member Functions
	from_question_attempts ($alias)
	where ()
	from_where_params ()
	usage_id_in ()
	usage_id_in_params ()

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Detailed Description

This class represents a restriction on the set of question_usage ids to include in a larger database query. Depending of the how you are going to restrict the list of usages, construct an appropriate subclass.

If $qubaids is an instance of this class, example usage might be

SELECT qa.id, qa.maxmark FROM $qubaids->from_question_attempts('qa') WHERE $qubaids->where() AND qa.slot = 1

Copyright:

2010 The Open University http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

Definition at line 1325 of file datalib.php.

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Member Function Documentation

from_question_attempts

(

$

alias

)

[abstract]

Returns:

string the SQL that needs to go in the FROM clause when trying to select records from the 'question_attempts' table based on the qubaid_condition.

Reimplemented in qubaid_join, and qubaid_list.

from_where_params

(

)

[abstract]

Returns:

the params needed by a query that uses from_question_attempts() and where().

Reimplemented in qubaid_join, and qubaid_list.

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usage_id_in

(

)

[abstract]

Returns:

string SQL that can use used in a WHERE qubaid IN (...) query. This method returns the "IN (...)" part.

Reimplemented in qubaid_join, and qubaid_list.

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usage_id_in_params

(

)

[abstract]

Returns:

the params needed by a query that uses usage_id_in().

Reimplemented in qubaid_join, and qubaid_list.

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where

(

)

[abstract]

Returns:

string the SQL that needs to go in the where clause.

Reimplemented in qubaid_join, and qubaid_list.

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

• C:/xampp/htdocs/moodle/question/engine/datalib.php