Generate Code By a Queue (Multi Cpu Programing)

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I have a Application In Vb.Net .I am Developing This Application on Microsoft Visual Studio 2008 , VB.NET, Sql Server 2005 , Crystal Report.

And That Application Have Registration Form . Now My Question Is
This Application is Installed On 5 different Computer In a Network . At the Mean time all 5 users
are Open Registration form Then They click on Save button on same time . I Have a table registration , and that has a column (code) that is primary key. whenever they want to save the record only one user can get save the record . all 4 users are rollback the transaction because of primary key violation error. Therefor i want to generate code on a queue basis .. where user can wait to get a Unique Code of that Record and i dont want to users request to rollback ...

Posted 29-Sep-13 23:26pm

Mohammad Nawaz

Updated 29-Sep-13 23:32pm

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holger_pedersen · Answer 1 · 2013-09-30T01:29:00

Mohammad,

INSERT
When you create a row/record in a table, you need a primary key; which has not been used, yet. this means, you need a common process; which can lookup for a new key to use before the key in the row to insert. Or you need a key; which is generated by the database, applying a IDENTITY column. This means, there will be 5 rows.

UPDATE
When you update a row; the last user update wins. There's not much else you can do. However, this shouldn't create a primary key violation.

:)