USER-DEFINED TYPES AND AGGREGATES return Parse(value.Value.ToString() +

USER-DEFINED TYPES AND AGGREGATES return Parse(value.Value.ToString() + + units.Value.ToString()); } } The MakeLDim function takes a double and a string as input. If either is null, it returns a null instance of an LDim. Otherwise, it builds a string and passes it to the Parse method. This will check the units passed into MakeLDim, and, if they are correct, create an instance of an LDim with the appropriate value. This convenience function makes the parametric insertion of an LDimmuch easier, as is shown in the SQL batch in Listing 5-24. Listing 5-24: Parametric Insertion Using MakeLDim DECLARE @d AS LDim CREATE TABLE Dimensions ( dim LDim ) go parametric value DECLARE @v AS FLOAT DECLARE @u as VARCHAR(2) SET @v = 1 SET @u = yd INSERT INTO Dimensions VALUES (dbo.MakeLDim(@v, @u)) As a result of having the MakeLDimfunction, the code that inserts a new LDimwith parameters for its value is much easier to both write and read. Unsupported Functions in User-Defined Types There are a few types of functionality that, while currently specified in SQL:1999, are unsupported in SQL Server SQL Server 2005 s implementation of UDTs. It s possible that the SQL Server team will add some of these over time as the utility of UDTs becomes more apparent. These functions include the following: Overloaded methods. Inheritance exposed at the Transact-SQL level. Exposing SQL properties such as numeric precision and scale in a UDT. Support of ordering. SQL:1999 specifies that UDTs can support ordering based on state values, implementation of a specific

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