Database design, and information storage and retrieval

ICT for Library and Information Professionals: A Training Package for Developing Countries
Slide 8
Data validation
A Sample data validation file is given below:
v to test the length of the field:
If size v2 > 4 then ‘Field 2 is too long’ fi
v To ensure that some fields cannot be skipped
without entering data
if a(v4) then ‘this field cannot be empty’ fi
UNESCO ICTLIP Module 4. Lesson 4
Note
In version 1.4 of WinISIS the validation file may contain other
instructions to define:
– A list of values that can be entered into the specified
fields (pick-up list)
– Actions to be executed on the current record before its
presentation for data entry
– Actions to be executed on this record when editing is
finished.
Tip
The functions described above may be explained at a later
stage if there is a possibility of extending the course. More
details about these are available in the WinISIS manuals
provided with the software.
Activity 04.04.02
Create a val file for the database created by the students.
Module 4:Database Design, and Information Storage and Retrieval: Lesson 4 Page 82 of 132