Microsoft ActiveX Data Objects (Multidimensional) (ADO MD) provides easy access to multidimensional data from languages such as Microsoft Visual Basic, and Microsoft Visual C++. ADO MD extends Microsoft ActiveX Data Objects (ADO) to include objects specific to multidimensional data, such as the CubeDef and Cellset objects. With ADO MD you can browse multidimensional schema, query a cube, and retrieve the results.
Microsoft ActiveX Data Objects Extensions for Data Definition Language and Security (ADOX) is an extension to the ADO objects and programming model. ADOX includes objects for schema creation and modification, as well as security. Because it is an object-based approach to schema manipulation, you can write code that will work against various data sources regardless of differences in their native syntaxes.
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You use Recordset objects to manipulate data from a provider. When you use ADO, you manipulate data almost entirely using Recordset objects. All Recordset objects consist of records (rows) and fields (columns). Depending on the functionality supported by the provider, some Recordset methods or properties may not be available.
Recordset objects can support two types of updating: immediate and batched. In immediate updating, all changes to data are written immediately to the underlying data source once you call the Update method. You can also pass arrays of values as parameters with the AddNew and Update methods and simultaneously update several fields in a record.
The simple answer to the question is yes. Pick the version of ADO youwant to use and ignore MDAC.A more detailed and really boring answer follows. [You can easily andsafely exit here.]When ADO was introduced and for most of its history it was supportedby a team separate from the development or system groups. It hadseparate release cycles from any other product. Products that shippedwith MDAC, included whatever current version was available and couldbe later updated with subsequent MDAC releases.The MDAC was the keystone of what Microsoft called "Universal Access",the idea of a single assortment of tools providing access to any datasource through a single access library. ODBC had gone a long way toproviding this sort of functionality, but ODBC was tied to a singlehierarchical data model - ADO and OLE DB removed this limitation.To implement this grand strategy MS adopted its other rising star -COM - that's where and why OLE is so much a major player.A major point of confusion is that while MDAC releases were/are namedafter the most current version of ADO (the ActiveX Data Objects) theysupported - the MDAC is actually a package of diverse though relatedcomponents - the principle catagories being OLE 'system' support, OLEDB components and OLE DB Providers, and the ADO data access library.(These packages originally also included ISAM and ODBC drivers, andthe DAO data access library, ie - one-stop shopping for all dataaccess.)The strategy was grand and ambitious. Perhaps too ambitious asproblems appeared almost immediately in trying to keep such a diverseasssortment of tools all current (and provide bug fixes and upgrades)in a single package. Or perhaps it was mostly marketing and MS neverreally expected it to be all that Universal in the first place.One problem was the ADO data access libraries, the second was theimprovement and fixes of the OLE/OLE DB components. While ADO itselfis essentially non-system dependent, OLE is totally system dependent,and OLE DB was product dependent as well as having a foot in both ADOand OLE.It would take too long to document all the various changes to theMDAC package in its migration from a 'universal' store house to a'specific' ADO/OLE tool, and such information isreadily available on the web, but to highlight a few ...The ADO libraries improved in features and needed bug fixes thefastest . (Probably why MDAC releases were named after ADO versions.)To manage this MS adopted the strategy to provide a single namedcomponent that supplied multiple interfaces. This simplified fourthings: 1) With each new ADO release MS simply provided a new interface to theexisting component, 2) Each version had many features in common with previous versions.Keeping them in the same component meant they only had to have one setof code for all,3) as bug fixes and improvements often affected more that one versionof ADO they could provide those fixes at a single point,4) they avoided having multiple versions laying around - one filereplaced the old. Each new release provides support for all previous versions of ADO.Stop and think what the packages might have looked like if MS hadn'tadopted this strategy. We could have had ... msado15.dll msado2.dll msado2b.dll msado25.dll msado25b.dll msado25c.dll msado25d.dll msado26.dll msado26b.dll msado26c.dll msado27.dll msado27b.dll msado28.dll msado28b.dll ...If having multiple interfaces for one component confused developersjust imagine what a mess the above would have been.The same problems existed for the OLE components and MS adopted thesame strategy. For different O/Ss (and the OLE components) MS simplyprovided separate MDAC packages. That's why there is a different onefor Win2000 and below and another one for XP. (Both labeled '2.8' bythe way.)For partly political reasons (MS announced the death of DAO severaltimes and really wanted to push migration to SQL server) and simplybecause the under-lying technology and dependences were so different,DAO, ISAM, and ODBC was removed from the MDAC. Those components aresupplied in separate JET packages.The MDAC has confused and caused doubt for years for otherwisecompetent developers (Mr. Toews's article an excellent example), andfor absolutely NO reason. A zillion bytes have been wasted when therule has ALWAYS been very simple and valid from Day One. Pick theversion of ADO you want to use. If a client doesn't have thecomponents to support that version then have them download or supplythe latest 'n greatest MDAC package - NO MATTER WHAT VERSION OF ADOYOU ARE USING.In general, previous to Vista, every client and developer has alwaysbeen advised to download the most current MDAC package appropriate fortheir system. Not necessarily to support a higher version of ADO butto take advantage of improvements and fixes for both ADO and OLE.Again - NO MATTER WHAT VERSION OF ADO A PARTICULAR PRODUCT IS USING.A developer can also take it as a general rule to develop against ADO2.5. This is because 1) after all this time it is the most stable, 2) the most clients already have it no matter what platform they areusing, and 3) 2.5 provides the bulk of the features a developercommonly uses. But this really has little to do with MDAC, except obviously theclient has to have an MDAC installed that has the components tosupports the version of ADO a program uses. But if everyone simplyinstalls the latest 'n greatest - then it was not, is not, nor shouldit ever be, a problem. [there were a few issues with 2.6, thus thesubsquent quick release of 2.7 and 2.7rtm, followed by their equallyquick demise with the release of 2.8.]IMHO If a developer knows his targets are XP and above then should useADO 2.8, but the advantage is only additonal features (which asalready noted you likely won't need but nice to have if you do. )and by now it is equally stable. And last - all of this is becoming a non-issue since MS now includesADO and OLE/OLE DB as part of Vista and Win7 supplied components (andupdated by SPs and not from a separate 'universal' package). MDAC isgone. So pick any version of ADO you want* it will be supported.MS also now supply OLE DB providers as separate downloads. OLE DB andOLE is likely to remain a platform supported feature.Whew!-ralph[* I don't advise picking anything previous to 2.5 as there aredifferences in behavior and not all the bugs have been fixed.]
This example shows how to manipulate data in a relational database using ActiveX Data Objects (ADO). ADO is a free download from Microsoft's web site. Currently, Microsoft is encouraging VBA developers to use ADO over the other types of data access. The key elements covered in this section include:
I have multiple documents & UserForms all of which are driven by VBA code. None of them work on Windows XP SP3 machines. This is despite the fact that they are all running Office 2010. Everytime is errors saying 'Missing microsoft activex data objects 6.1 library'.
By instantiating a Stream object. These Stream objects can be used to store data for the purposes of your application. Unlike a Stream associated with a URL, or the default Stream of a Record, an instantiated Stream has no association with an underlying source by default.
To export your metadata from Microsoft Access, download the correct version of the Exporter tool, as explained in this section. Then, run the Exporter and extract the metadata from the Microsoft Access .mdb file. The metadata contains the necessary database and application schema information.
ADO already provides access to most common database formats, but what do you do if you are dealing with a unique file format? Perhaps you're the developer of a brand new, technologically advanced database system. If you have an ODBC driver for your data, you can use that. However, you can also write an OLE DB provider for your data. Writing an OLE DB provider is an advanced subject in and of itself, so I will not get into the details here. However, Microsoft's documentation covers this subject, and their download even includes a sample OLE DB provider that you can study.
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