Development:Dataset dependent

Database tables

question_dataset_definitions

Organises and stores properties for dataset items

This table is an indirect extension to the question table, because the question_datasets table can link a question to one or more datasets. Each dataset represents a variable, that is used either in the questiontext or in the answer to a dataset dependent question.

id

int(10) unsigned NOT NULL auto_increment,

category

int(10) unsigned NOT NULL default '0',

when this is a shared dataset the value is the category id 
when this is a private dataset the value is 0

name

varchar(255) NOT NULL default ,

type

int(10) NOT NULL default '0',

this can be 1=LITERAL 2=FILE 3=LINK

options

varchar(255) NOT NULL default ,

the options for this dataset separated by ':'(distribution:min:max:decimals)

itemcount

int(10) unsigned NOT NULL default '0',

the number of dataset items

question_dataset_items

Individual dataset items

Dataset items can be created for each dataset. The dataset_items table stores these possible values for the variables defined in the dataset_definitions table.

id

int(10) unsigned NOT NULL auto_increment,

definition

int(10) unsigned NOT NULL default '0',

id corresponding to the question_dataset_definitions table

number

int(10) unsigned NOT NULL default '0',

value

varchar(255) NOT NULL default ,

question_datasets

Many-many relation between questions and dataset definitions

The question_datasets table is used by dataset dependent question types (i.e. calculated) to link datasets to questions.

id

int(10) unsigned NOT NULL auto_increment,

question

int(10) unsigned NOT NULL default '0',

id from the question table

datasetdefinition

int(10) unsigned NOT NULL default '0',

id from the question_dataset_definitions table