Valdity check at rutime

i ask about set all value of valdity check of field at rutime such as min ,max and defualt value of field all field i mean createtion at rutime ...

Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

There are 2 ways to do this:

1) Do it on the database server: you can set the constraints in the database-level, which is the most adequate approach if you are creating a client/server application. In order to do this, you can execute an SQL statement that will create the constraint:


ALTER TABLE accounts

(actual syntax depends on the DMBS you're using)

2) You can do it using the fields inspector for the TQuery/TTable you are using:

- Double click the TTable/TQuery component;
- Right-click the the Fields window and select "Add all fields"

Ok, this preparation is necessary in Design-time so you can do all the rest in runtime:

Table1.FieldByName('Balance').DefaultExpression := 0;

Table2.FieldByName('Salary').MinValue := 7000;



Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
just complete ;-)
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.