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11 CLR User-Defined Types
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that uses the IsNull property in T-SQL as well, it is more efficient to test for NULLs using the Null property . Inheritance relationships are not recognized by SQL Server . You can use class hierarchies, but they are not defined in the SQL Server catalog and not used in T-SQL operations . In the CLR code, you can use class hierarchies; that is, use a base class and then define a subclass, which is your UDT . The subclass inherits all the methods of the base class . If the inherited methods are explicitly programmed in the subclass and this means they are overridden (commonly you do this to change the behavior of the method, not just to repeat the code from the base class) SQL Server will recognize them . If not, SQL Server does not know how to go to the base class and execute the code from the base class . But at the client side, in a .NET application that has references to the assembly with the base class and the UDT class, you can use methods from the base class without explicitly overriding them, because .NET recognizes class hierarchies . So basically you do not use inheritance when you define a UDT, unless you want to have some additional functionality only at the client side . Native formatting is simple to implement, but it has a drawback you can use only .NET value types in your UDT . The only really big problem is the string type, which is a reference type in .NET . If you use strings (or, of course, any other .NET reference type) in your UDT, you have to write your own serialization code . The UDT should support XML serialization as well . It must either implement the System.Xml .IXmlSerializable interface, or all public fields and properties must be of types that are XML serializable . If they are not XML serializable, they must be decorated with the XmlIgnore attribute if overriding standard serialization is required . The complex number UDT I am going to develop does not implement an explicit XML serialization and also does not use the XmlIgnore attribute, so we can use XML serialization from the string representation only . SQL Server and .NET native types do not match one-to-one . You should use .NET SqlTypes whenever possible because they correspond directly to SQL Server native types . The System.Data.SqlTypes namespace contains the classes that represent SQL Server native data types available to the assembly . Finally, to get a list of all the requirements of a CLR user-defined data type, please refer to the User-Defined Type Requirements topic in SQL Server Books Online .
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Visual Studio 2008 has templates (skeletons) for creating CLR objects in SQL Server 2008 . Note that you have to install Service Pack 1 or later for Visual Studio 2008 to support direct deployment of CLR objects . Some editions of Visual Studio .NET 2008 don t support the SQL Server CLR objects template . If you re working with such an edition, you have to create a standard class library, write all of the requested methods and properties manually, and then
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deploy the objects in SQL Server using T-SQL explicitly (via the CREATE ASSEMBLY | TYPE | AGGREGATE | FUNCTION | PROCEDURE | TRIGGER commands) . In my examples, I ll take the longer route so that you ll be familiar with the whole process . In addition, in production a DBA would probably not allow deployment from Visual Studio . But first let s develop a UDT in C# step by step . I ll present a code snippet in each step accompanied by explanations . Putting all code snippets together will give you a complete working UDT . More Info The complete UDT code is available to you as part of the book s source code, which
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