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CREATE TYPE MyTbl AS TABLE (ID INT, String NVARCHAR(100)) GO
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You can treat the type almost like any kind of persisted table, such as by defining a primary key, CHECK constraints, default values for fields, and computed columns, and you can even set permissions. One of the few limitations is that you can t call user-defined functions from types. The next step is to create a stored procedure that uses a parameter of the MyTbl type. The dkSelectFromTVP procedure takes the TVP as its only parameter and returns the contents of the table using a SELECT statement. As I said, this is a simple example.
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CREATE PROCEDURE dkSelectFromTVP(@TVParam MyTbl READONLY) AS SET NOCOUNT ON; SELECT * FROM @TVParam; GO
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Next, create an instance of the TABLE type and populate it from data. The code that follows creates the @TVP variable and inserts some data with the names of some cities and locations in Alaska. Notice that you can populate TABLE types using the same T-SQL statements used to insert data in regular, persisted tables.
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DECLARE @TVP AS MyTbl; INSERT INSERT INSERT INSERT INTO INTO INTO INTO @TVP(ID, @TVP(ID, @TVP(ID, @TVP(ID, String) String) String) String) VALUES VALUES VALUES VALUES (1, (2, (3, (4, 'Fairbanks'); 'Juneau'); 'Anchorage'); 'Denali');
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@TVP behaves like any other kind of local variable, with a well-defined scope the code
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module in which you declare it that is cleaned up when it goes out of scope. One benefit is that using a table-valued parameter with a stored procedure generally causes fewer recompilations than using temporary tables. The final step is to run the stored procedure, passing the @TVP table-valued parameter. Here s the code:
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EXEC dkSelectFromTVP @TVP;
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This produces the result shown in figure 1. Amazing! We have a stored procedure that returns the result of a SELECT statement! Let s take the example a few steps further. Say that you want to change the data within the stored procedure before returning it. Here is a revised stored procedure that shows
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Figure 1 Results of passing a TVP to a stored procedure with list of Alaska place names
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Table-valued parameters
some civic pride by adding Rocks! to every city name other than Anchorage (which is just a big city that is more like Seattle than anything else in Alaska).1
ALTER PROCEDURE dkSelectFromTVP(@TVParam MyTbl READONLY) AS SET NOCOUNT ON UPDATE @TVParam SET String=String + ' Rocks!' WHERE String <> 'Anchorage' SELECT * FROM @TVParam GO
But when you run this ALTER code, it produces an error message:
Msg 10700, Level 16, State 1, Procedure dkSelectFromTVP, Line 5 The table-valued parameter "@TVParam" is READONLY and cannot be modified.
Oops! We forgot to remove the READONLY keyword in the definition. After making that change, here is the new code:
ALTER PROCEDURE dkSelectFromTVP(@TVParam MyTbl) AS SET NOCOUNT ON UPDATE @TVParam SET String=String + ' Rocks!' WHERE String <> 'Anchorage' SELECT * FROM @TVParam GO
But when you run this code, you still get an error message:
Msg 352, Level 15, State 1, Procedure dkSelectFromTVP, Line 1 The table-valued parameter @TVParam must be declared with the READONLY option.
This shows that a TVP must be declared as READONLY within the code module where you use it as a parameter. This means that you can t change the contents of the table from within the code module. This is a disappointing limitation of TVPs in SQL Server 2008, but Microsoft is receiving pressure to ease this restriction in an update or future version. For now, you can work around the problem by making changes to the content of the table variable before passing it to a code module. The following code shows an example of how you could do that:
DECLARE @TVP AS MyTbl INSERT INSERT INSERT INSERT INTO INTO INTO INTO @TVP(ID, @TVP(ID, @TVP(ID, @TVP(ID, String) String) String) String) VALUES VALUES VALUES VALUES (1, (2, (3, (4, 'Fairbanks') 'Juneau') 'Anchorage') 'Denali')
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