Friday, December 19, 2008

Table-Valued Parameters (TVP) in SQL Server 2008

Support of Table-Valued Parameters is another great new feature in SQL Server 2008.

I am sure that all of us had to make a stored procedure or function call in SQL Server many times. In the cases where many values should be passed as parameters it was a little bit difficult as we had to use some really long lines of code. Not any more with Table-Valued Parameters :)

The usual procedure for using TVPs is the following:

1. Create a user-defined table type that can be passed as a TVP to a function or stored procedure

Code Example:
--Create a table type
CREATE TYPE employee AS TABLE
(ID int,
NAME varchar(50))
GO

2. Create a stored procedure or function that uses a TVP

Code Example:
--Create a stored procedure that takes as a parameter a TVP
CREATE PROCEDURE showTVPValues(@TVParameter employee READONLY)

AS
SET NOCOUNT ON
SELECT * FROM @TVParameter
GO

3. Declare the table type variable

Code Example:
--Declare a variable that references the user-defined table type
DECLARE @TVP_Param AS employee;

4. Populate the table type variable with data

Code Example:
--Add data to the table variable
INSERT INTO @TVP_Param (ID, NAME)
SELECT [ID],[NAME]
FROM [table_name].[column_name];

5. Pass the table type variable as a parameter to the stored procedure

Code Example:
--Pass the table variable to the stored procedure
EXEC showTVPValues @TVP_Param;
GO


With this way you can pass tabular data to a function or stored procedure as a single parameter.
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Artemakis Artemiou [MVP]

Author & Editor

Artemakis Artemiou is a Senior SQL Server Architect, Software Developer and Microsoft Data Platform MVP. He is also an author, regular blogger, president of Cyprus.NET User Group and CY Country leader of INETA-EU. He is also the creator of DBA Security Advisor and In-Memory OLTP Simulator. Artemakis is a frequent guest author of worldwide well-respected online journals where he writes articles focusing on many SQL Server topics.

Reference: The SQL Server and .NET Hub (http://www.sqlnethub.com)

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