ActiveX Data Objects: Difference between revisions

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{{Use American English|date=January 2019}}

{{no footnotes|date=February 2013}}

In [[computing]], [[Microsoft]]'s '''ActiveX Data Objects''' ('''ADO''') comprises a set of [[Component Object Model]] (COM) [[object (computing)|object]]s for accessing data sources. A part of [[Microsoft Data Access Components|MDAC]] (Microsoft Data Access Components), it provides a [[middleware]] layer between [[programming language]]s and [[OLE DB]] (a means of accessing data stores, whether [[database]]s or not, in a uniform manner). ADO allows a [[software developer|developer]] to write programs that access data without knowing how the database is implemented; developers must be aware of the database for connection only. No knowledge of [[SQL]] is required to access a database when using ADO, although one can use ADO to execute SQL commands directly (with the disadvantage of introducing a dependency upon the type of database used).

Microsoft introduced ADO in October 1996, positioning the software as a successor to Microsoft's earlier object layers for accessing data sources, including [[Remote Data Objects|RDO]] (Remote Data Objects) and [[Jet Data Access Objects|DAO]] (Data Access Objects).

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=== ASP example ===

Here is an [[Active Server Pages|ASP]] example using ADO to select the "Name" field, from a table called "Phonebook", where a "PhoneNumber" was equal to "555-5555".

<syntaxhighlight lang=vb"vbscript">

dim myconnection, myrecordset, name

set myconnection = server.createobject("ADODB.Connection")

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This is equivalent to the following ASP code, which uses plain SQL instead of the functionality of the Recordset object:

<syntaxhighlight lang=vb"vbscript">

dim myconnection, myrecordset, name

set myconnection = server.createobject("ADODB.connection")

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==Software support==

ADO is supported in any development language that supports binding to binary COM interfaces. These languages include ASP, [[Embarcadero Delphi (programming language)| Delphi]], [[PowerBuilder]], and [[Visual Basic for Applications]] (VBA). ADO support has now been added to [[dBase]] Plus 8 (With ADO)

==Legacy==

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* [[ADO.NET]]

* [[Comparison of ADO and ADO.NET]]

* [[ActiveX]]

* [[MSDAIPP]]

==References==

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{{Microsoft APIs}}

{{Authority control}}

{{DEFAULTSORT:Activex Data Objects}}