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When using VCL Forms and the VCL.NET framework components, you can extend database support even further by using the BDE.NET, dbExpress.NET, and Midas Client for .NET connection technologies.
Model-Driven Applications
Modeling is a term used to describe the process of software design. Developing a model of a software system is roughly equivalent to an architect creating a set of blueprints for a large development project. Like a set of blueprints, a model not only depicts the system as a whole, but also allows you to focus in on specifics such as structural and behavioral details. Abstracted away from any particular programming language (and at some levels, even from specific technology), the model allows all participants in the development cycle to communicate in the same language. Borland''''s Model Driven Architecture (MDA) describes an approach to software engineering where the modeling tools are completely integrated within the development environment itself. The MDA is designed around Borland’s Enterprise Core Objects (ECO) framework. The ECO framework is a set of interface, classes, and custom attributes that provide the communication conduit between your application and the modeling-related features of the IDE. The ECO features include:
 Automatic mapping of the model classes, with their attributes and relationships, to a relational schema.
Automatic evolution of schema when the model changes.
Specification of the persistence backend. You can choose to store objects in a relational database or in an XML file.
Design-time structural validation of the model and its Object Constraint Language (OCL) expressions.
Runtime validation of the OCL expressions.
An event mechanism that allows you to receive notifications whenever objects are added, changed, or removed.
Delphi 2005 IDE leverages the ECO framework to provide an integrated surface on which to develop your application model. The IDE and its modeling surface features include:
Creating model-driven applications as a new kind of project.
Creating class diagrams, and manipulating model elements (packages, and classes) directly on the surface.
Adding, removing, and changing class attributes and methods on the class diagram.
Two-way updating between source code and the modeling surface. Changes in source code are reflected in the graphical depiction, and vice versa.
Two-way navigating between model elements and source code. You can navigate from the graphical depiction of a model element directly to its corresponding source code. Similarly, you can navigate from a modeled class in source code directly to its graphical diagram on the modeling surface.
Exporting and importing models using XMI 1.1.
Note: Not all modeling features are available in all editions of Delphi 2005. To determine the modeling features supported in your product edition, refer to the feature matrix on either the Borland Delphi web page or the Borland C#Builder web page.
Assemblies
An assembly is a logical package, much like a DLL file, that consists of manifests, modules, portable executable (PE) files, and resources (.html, .jpeg, .gif) and is used for deployment and versioning. An application can have one or more assemblies that are referenced by one or more applications, depending on whether the assemblies reside in an application directory or in a global assembly cache (GAC).
Additional Projects
In addition to the project types described above, Delphi 2005 provides templates to create class libraries, control libraries, console applications, Visual Basic applications, reports, text files, and more. These templates are stored in the Object Repository and you can access them by choosing File New Other .
Unmanaged Code and COM/Interop
Unmanaged code refers to applications that do not target the .NET Framework Common Language Runtime (CLR). COM/Interop is a .NET service that allows seamless interoperation between managed and unmanaged code. The COM/Interop service allows you to leverage existing COM servers and ActiveX controls in your .NET applications, and expose .NET components in legacy unmanaged applications. The Delphi 2005 IDE includes tools to help you integrate your legacy COM servers and ActiveX controls into managed applications. Additionally, you can add references to unmanaged DLLs to your project, and then browse the types contained, just as you would with managed assemblies.
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