Dataset dependent

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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

Response storage

Question->options

State->options