SqlMethodAttribute Class

SqlMethodAttribute Class


Indicates the determinism and data access properties of a method or property on a user-defined type (UDT). The properties on the attribute reflect the physical characteristics that are used when the type is registered with SQL Server.

Namespace:   Microsoft.SqlServer.Server
Assembly:  System.Data (in System.Data.dll)


[AttributeUsageAttribute(AttributeTargets.Method, AllowMultiple = false, 
	Inherited = false)]
public sealed class SqlMethodAttribute : SqlFunctionAttribute


An attribute on a user-defined type (UDT), used to indicate the determinism and data access properties of a method or a property on a UDT.


Indicates whether the function involves access to user data stored in the local instance of SQL Server.(Inherited from SqlFunctionAttribute.)


The name of a method in the same class as the table-valued function (TVF) that is used by the TVF contract.(Inherited from SqlFunctionAttribute.)


Indicates whether SQL Server should invoke the method on null instances.


Indicates whether the user-defined function is deterministic.(Inherited from SqlFunctionAttribute.)


Indicates whether a method on a user-defined type (UDT) is a mutator.


Indicates whether the function involves imprecise computations, such as floating point operations.(Inherited from SqlFunctionAttribute.)


The name under which the function should be registered in SQL Server.(Inherited from SqlFunctionAttribute.)


Indicates whether the method on a user-defined type (UDT) is called when null input arguments are specified in the method invocation.


Indicates whether the function requires access to data stored in the system catalogs or virtual system tables of SQL Server.(Inherited from SqlFunctionAttribute.)


A string that represents the table definition of the results, if the method is used as a table-valued function (TVF).(Inherited from SqlFunctionAttribute.)


When implemented in a derived class, gets a unique identifier for this Attribute.(Inherited from Attribute.)


This API supports the product infrastructure and is not intended to be used directly from your code. Returns a value that indicates whether this instance is equal to a specified object.(Inherited from Attribute.)


Returns the hash code for this instance.(Inherited from Attribute.)


Gets the Type of the current instance.(Inherited from Object.)


When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class.(Inherited from Attribute.)


When overridden in a derived class, returns a value that indicates whether this instance equals a specified object.(Inherited from Attribute.)


Returns a string that represents the current object.(Inherited from Object.)

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr)

Maps a set of names to a corresponding set of dispatch identifiers.(Inherited from Attribute.)

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.GetTypeInfo(UInt32, UInt32, IntPtr)

Retrieves the type information for an object, which can be used to get the type information for an interface.(Inherited from Attribute.)


Retrieves the number of type information interfaces that an object provides (either 0 or 1).(Inherited from Attribute.)

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr)

Provides access to properties and methods exposed by an object.(Inherited from Attribute.)

For a property, the SqlMethodAttribute should be used on the setter or the getter directly.

SqlMethodAttribute inherits from a SqlFunctionAttribute, so SqlMethodAttribute inherits the FillRowMethodName and TableDefinition fields from SqlFunctionAttribute. Note that it is not possible to write a table-valued method, although the names of these fields might suggest that it is possible.

The following example shows a UDT method that is attributed to indicate that the method will not be invoked on null instances of the type, that the method will not change the state of the type, and that the method will not be called when null parameters are supplied to the method invocation.

// Distance from Point to the specified x and y values method.
[SqlMethod(OnNullCall = false, IsMutator=false, InvokeIfReceiverIsNull=false)]
public Double DistanceFromXY(Int32 iX, Int32 iY)
   return Math.Sqrt(Math.Pow(iX - _x, 2.0) + Math.Pow(iY - _y, 2.0));

.NET Framework
Available since 2.0

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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