how to check data it is already exists or not in database when i am inserting

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Hi, i made a web application and when i insert a data from text box to table i want to check data is already exist or not .if data is already exist then i want a message "data is already exists" what type of query i should wrote ?

or how to use not exists query ?

i am using sql server.

Thanks in advance

Posted 20-Feb-12 20:12pm

mayankshrivastava

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Varun Sareen 21-Feb-12 2:17am

have you tried something yet?

mayankshrivastava 21-Feb-12 2:19am

ya i tried not exists clause.

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Om Prakash Pant · Answer 1 · 2012-02-20T20:24:00

Create proc similar to the following & check the return value and show the message accordingly..

SQL

Create Procedure Proc_Name
(
    @EMailAdress varchar(50) = null,
}
AS

IF EXISTS (SELECT UserID  FROM E-MAIL WHERE EMailAdress = @EMailAdress)
BEGIN
    return 0
END
ELSE
BEGIN
    INSERT INTO E-MAIL (UserID,EMailAdress,Description) VALUES (UserID,@EMailAdress,@Description)
    return 1
END

In the code, check for the return value something like...

C#

int returnValue =  (int) comm.ExecuteScalar();