FDO API Reference

Feature Data Objects

ComputedIdentifier Class Reference

List of all members.

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Detailed Description

The FdoComputedIdentifier class derives from FdoIdentifier and represents an expression with alias. The name or alias must be a simple name and should not be scoped or contain the the schema name. The FdoComputedIdentifier can be used to provide an alias to an expression. For example the expression Length*NumLanes can be refered to as MaxTraficCapacity. In this case, a computed identifier can be created as:.

///    FdoComputedIdentifier::Create(L"MaxTraficCapacity", 
///        FdoBinaryExpression::Create( FdoIdentifier(L"Length"),
///                                     FdoBinaryOperations_Multiply,
///                                     FdoIdentifier(L"NumLanes")
///         );
/// );
/// 

Note:

For clarity, the example omits the release code needed to free the various created objects.

Public Member Functions
	ComputedIdentifier (System::IntPtr unmanaged, System::Boolean autoDelete)
	ComputedIdentifier (System::String *name, NAMESPACE_OSGEO_FDO_EXPRESSION::Expression *expression)
	Constructs an instance of an identifier using the specified arguments.
	ComputedIdentifier ()
	Constructs a default instance of an identifier.
__property NAMESPACE_OSGEO_FDO_EXPRESSION::Expression *	get_Expression ()
	Gets the full text of the identifier.
System::Void	Process (NAMESPACE_OSGEO_FDO_EXPRESSION::IExpressionProcessor *processor)
	Overrides FdoExpression.Process to pass the FdoComputedIdentifier to the appropriate expression processor operation.
System::Void	set_Expression (NAMESPACE_OSGEO_FDO_EXPRESSION::Expression *value)
	Sets the full text of the identifier.
System::String *	ToString ()
	Returns the well defined text representation of this expression.

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