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In computing, Microsoft's ActiveX Data Objects (ADO) comprises a set of Component Object Model (COM) objects for accessing data sources. A part of MDAC (Microsoft Data Access Components), it provides a middleware layer between programming languages and OLE DB (a means of accessing data stores, whether databases or not, in a uniform manner).
Microsoft Data Access Components (MDAC; also known as Windows DAC) is a framework of interrelated Microsoft technologies that allows programmers a uniform and comprehensive way of developing applications that can access almost any data store. Its components include: ActiveX Data Objects (ADO), OLE DB, and Open Database Connectivity (ODBC).
ActiveX is a deprecated software framework created by Microsoft that adapts its earlier Component Object Model (COM) and Object Linking and Embedding (OLE) technologies for content downloaded from a network, particularly from the World Wide Web. [1] Microsoft introduced ActiveX in 1996.
It is commonly used by programmers to access and modify data stored in relational database systems, though it can also access data in non-relational data sources. ADO.NET is sometimes considered an evolution of ActiveX Data Objects (ADO) technology, but was changed so extensively that it can be considered an entirely new product.
Component Object Model (COM) is a binary-interface technology for software components from Microsoft that enables using objects in a language-neutral way between different programming languages, programming contexts, processes and machines.
The language provides a user interface in the form of UserForms, which can host ActiveX controls for added functionality. Inter-process communication automation includes the Dynamic Data Exchange (DDE) and RealTimeData (RTD) which allows calling a Component Object Model (COM) automation server for dynamic or realtime financial or scientific ...
VB provides a large library of utility objects, and it provides basic support for object-oriented programming. Unlike many other programming languages, VB code is not case-sensitive – though the IDE transforms keywords into a standard case and variable names to match the case used elsewhere in the project.
This was the source of many out-by-one errors in Visual Basic programs, especially when dealing with interoperability across program library boundaries. Although the .NET Common Language Runtime can support arrays with any base value, Visual Basic .NET and C# provide only zero-based arrays and lists, and the .NET Common Language Specification ...