Development: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
