How to validate against existing data

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frens m jus a beginner, i have given the coding for inserting the values. now i want to know how to stop saving the existing data. can u pls send me the coding in vb.net.(user mustn't be able to save data which he has entered earlier)

Posted 5-Dec-11 18:29pm

jus coding

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Manoj K Bhoir 6-Dec-11 0:36am

Please provide your code which you used to insert Data!

2 solutions

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Ganesan Senthilvel · Answer 1 · 2011-12-05T18:43:00

Solution 1

In stead of doing at VB level, you can easily perform at SQL level as:

SQL

INSERT INTO dbo.Applications (Date, firstname, lastname, Version) VALUES('3/12/2011', 'Tom', 'cruise', '2.0') WHERE NOT EXISTS (SELECT * FROM dbo.Applications WHERE firstname = Tom AND lastname = cruise)

Posted 5-Dec-11 18:43pm

Ganesan Senthilvel

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jus coding 6-Dec-11 0:53am

u mean to say that i have to write this in sql

Eduard Lu · Answer 2 · 2011-12-05T18:58:00

Solution 2

Try this.

SQL

IF((SELECT COUNT(id) FROM Users WHERE username = @username) > 0)
BEGIN
   -- UPDATE STATEMENT
END
ELSE
BEGIN
   -- INSERT STATEMENT
END

Regards,
Eduard

Posted 5-Dec-11 18:58pm

Eduard Lu