Validation Checks

Question 1

What is a validation check?

Answer 1

Validation is a process to check that input data is reasonable or sensible. Frequently used validation algorithms include:

Question 2

Presence check

Answer 2

Used to prevent further progress if a required field is left blank.

Question 3

Format checks

Answer 3

Used to ensure data matches a specific pattern, such as dd/mm/yyyy for a date. Input masks are often used to create format checks on database forms.

Question 4

Length checks

Answer 4

Used to ensure an input data string is a sensible length, e.g. number of characters in ‘firstName’ to be between 3 and 16

Question 5

Type check

Answer 5

Used to ensure input data is a particular data type, e.g. quantity ordered to be integer or cost to be real.

Question 6

Range checks

Answer 6

Used to ensure input data lies within a specified range, e.g. over time hours to be > 0 and < 15.