database and message box

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I have two forms:
- One is for searching the movie.
- Second one is for adding movie.

What I would like is if a person adds a movie say Fast5 and that movie already exists in the database I want to show an error message box telling that the movie already exist rather then the program crash.

Same thing for the search for a movie if it does not exist in the database an message box telling that there is no such movie.

Posted 19-Nov-11 10:37am

avin chand

Updated 19-Nov-11 10:41am

André Kraak

v2

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Sergey Alexandrovich Kryukov 19-Nov-11 16:40pm

What is "program crash", exactly? Why do you expect such "crash" even it you try to add existing record? try to query for non-existent object? Did you it? What did you try?
--SA

[no name] 20-Nov-11 0:00am

What have you tried so far?

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OriginalGriff · Answer 1 · 2011-11-19T20:36:00

This smells badly of homework, so no code for you!
However, it isn't complex: you need to add a get "the movie details from the database" function.

1) Connect to the database
2) Set up a SQL command, with the string "SELECT * FROM myTable WHERE movieName=@MN"
3) Use the SQLCommand function Parameters.AddWithValue to add the parameter "@MN" to the command, with the value being the movie name.
4) Use the SQLCommand function ExecuteReader to read records from the DB.
5) If the reader.Read function returns true, there is a movie with than name in the db - you can retrieve the fields.
6) If it doesn't, there is no movie of that name.