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You can create a UNIQUE or PRIMARY KEY constraint on a computed column that invokes a UDF . Keep in mind that both constraints create a unique index under the covers . This means that the target computed column and the UDF it invokes must meet indexing guidelines . For example, the UDF must be schema bound (created with the SCHEMABINDING option); the computed column must be deterministic and precise or deterministic and persisted, and so on . You can find the details about indexing guidelines for computed columns and UDFs in SQL Server Books Online . The following code attempts to add to T1 a computed column called col1 which invokes the AddOne UDF and create a UNIQUE constraint on that column:

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[Solved] How to read a barcode using a barcode scanner - CodeProject
If you enter (or scan) something in TextBox 1 and then press Enter (which usually barcode scanners automatically do after scanning a barcode) ...

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ALTER TABLE dbo.T1 ADD col1 AS dbo.AddOne(keycol) CONSTRAINT UQ_T1_col1 UNIQUE;

The attempt fails with the following error:

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Msg 2729, Level 16, State 1, Line 1 Column 'col1' in table 'dbo.T1' cannot be used in an index or statistics or as a partition key because it is non-deterministic. Msg 1750, Level 16, State 0, Line 1 Could not create constraint. See previous errors.

The error occurs because the function doesn t meet one of the requirements for indexing, which says that the function must be schema bound . As you can see, the error message itself is not too helpful in indicating the cause of the error or in suggesting how to fix it . You need to realize that to fix the problem, you should alter the function by adding the SCHEMABINDING option:

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Try adding the computed column with the UNIQUE constraint again . This time your code runs successfully:

ALTER TABLE dbo.T1 ADD col1 AS dbo.AddOne(keycol) CONSTRAINT UQ_T1_col1 UNIQUE;

http:///www.jdom.org http://www.junit.org http://www.mercuryinteractive.com. (continued on next page)

It s a bit trickier when you try to create a PRIMARY KEY constraint on such a computed column . To see how this works, first drop the existing PRIMARY KEY from T1:

ALTER TABLE dbo.T1 DROP CONSTRAINT PK_T1;

Next, attempt to add another computed column called col2 with a PRIMARY KEY constraint:

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ALTER TABLE dbo.T1 ADD col2 AS dbo.AddOne(keycol) CONSTRAINT PK_T1 PRIMARY KEY;

The attempt fails, generating the following error:

Msg 1711, Level 16, State 1, Line 1 Cannot define PRIMARY KEY constraint on column 'col2' in table 'T1'. The computed column has to be persisted and not nullable. Msg 1750, Level 16, State 0, Line 1 Could not create constraint. See previous errors.

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You must explicitly guarantee that col2 never ends up with a NULL . You can achieve this by defining the column as PERSISTED and NOT NULL:

ALTER TABLE dbo.T1 ADD col2 AS dbo.AddOne(keycol) PERSISTED NOT NULL CONSTRAINT PK_T1 PRIMARY KEY;

When you re done, run the following code for cleanup:

IF OBJECT_ID('dbo.T1', 'U') IS NOT NULL DROP TABLE dbo.T1; IF OBJECT_ID('dbo.T1_getkey', 'FN') IS NOT NULL DROP FUNCTION dbo.T1_getkey; IF OBJECT_ID('dbo.AddOne', 'FN') IS NOT NULL DROP FUNCTION dbo.AddOne; IF OBJECT_ID('dbo.AddOneInline', 'IF') IS NOT NULL DROP FUNCTION dbo.AddOneInline;

Books you may want to read:

Don t forget to stop the activity in connection 4 when you re done . At this point, you can close all connections .

Error handling has taken a major leap forward with the introduction of the TRY/CATCH construct . When you use TRY/CATCH your error-handling code is more structured, elegant, and traps all errors except for the most severe ones . It also provides a lot of useful information via the error-related functions . When you are using TRY/CATCH, and an error happens in an explicit transaction, your session can end up in one of three different transaction states: no transaction open, open and committable, or open and uncommittable (failed) . Remember that the failed state allows you to keep a transaction open, holding all locks, while you re investigating data . You then must roll back the transaction before making any change . I hope that future versions of SQL Server will add more error-handling features, such as throwing system errors, rethrowing errors, and autonomous transactions, to name a few .

Sommarskog s Web site: www.sommarskog.se . Erland is a very active SQL Server MVP, and the subject of error handling is very close to his heart .

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I am trying to follow along with the article: Distinguishing Barcode Scanners from the Keyboard in WinForms . However I have the following ...

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Net Winform that has a textbox where a user can manually type in text or they can use a USB connected barcode scanner (that simulates a keyboard) to capture ...

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