detecting same records

can anyone help me with this... i am trying to add new record and my problem is what if theres the same record in my database how can i avoid that...

example im adding applicant with applicant id 0001 then im going o add a new one and accidentally i input and applicant id 0001what will i do to not to add that.

You should setup up your database tables correctly with primary keys, then its just a matter of trapping the error that occurs when you try to add a duplicate key in the program.

You can do like the previous poster said or you can run a quick query on your table looking for the ID you are trying to enter. Then return a boolean value if it is there or not.

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Originally Posted by Besoup

You can do like the previous poster said or you can run a quick query on your table looking for the ID you are trying to enter. Then return a boolean value if it is there or not.

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True, however primary keys are there for a reason. It would be considered 'more correct' to set up keys, because even if you were manually entering the data into the table (through the SQL Server interface or Access, etc) the keys would prevent accidental duplicates, where as being dependent on the program would not.

I agree with your method.. was just offering a work around.

i already have the primary key. can u give me an example program about ths

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Originally Posted by mheiy

i already have the primary key. can u give me an example program about ths

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Here is the example.

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Originally Posted by crptcblade

You should setup up your database tables correctly with primary keys, then its just a matter of trapping the error that occurs when you try to add a duplicate key in the program.

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Just trap the error when it occurs and display an appropriate message box.