This article has an unclear citation style. The references used components of data communication pdf be made clearer with a different or consistent style of citation and footnoting. Microsoft technologies that allows programmers a uniform and comprehensive way of developing applications that can access almost any data store.
The first version of MDAC was released in August 1996. At that time Microsoft stated MDAC was more a concept than a stand-alone program and had no widespread distribution method. Later Microsoft released upgrades to MDAC as web-based redistributable packages. Eventually, later versions were integrated with Microsoft Windows and Internet Explorer, and in MDAC 2.
Throughout its history, MDAC has been the subject of several security flaws, which led to attacks such as an escalated privileges attack, although the vulnerabilities were generally fixed in later versions and fairly promptly. There are two general types of Net-Lib: the primary and the secondary. IP secondary Net-Lib is an exception in that it calls on the Windows Sockets 2 API directly. It uses a shared memory area to communicate between the processes. This allows Net-Lib to provide an integrated logon authentication mechanism via the use of Windows Authentication.
Windows Authentication is not supported on Windows 98 or Windows Me. Microsoft has used this technology to separate the application from data can store in the website the data store that it needs to access. This was done because different applications need access to different types and sources of data, and do not necessarily need to know how to access technology-specific functionality. OLE DB is the database access interface technology used by MDAC.
A user can use a Data Link Properties dialog box to save connection information in a . Consequently, these files provide a convenient level of indirection. It uses a hierarchical object model to allow applications to programmatically create, retrieve, update and delete data from sources supported by OLE DB. Fields: This collection contains a set of Field objects. The collection can be used in either a Recordset object or in a Record object. In a Recordset object, each of the Field objects that make up the Fields collection corresponds to a column in that Recordset object. Properties: An object can have more than one Property object, which are contained in the object’s Properties collection.
Errors: All provider created errors are passed to a collection of Error objects, while the Errors collection itself is contained in a Connection object. When an ADO operation creates an error, the collection is cleared and a new group of Error objects are created in the collection. Connection: The connection object is ADO’s connection to a data store via OLE DB. The connection object stores information about the session and provides methods of connecting to the data store. As some data stores have different methods of establishing a connection, some methods may not be supported in the connection object for particular OLE DB providers. Command: After the connection object establishes a session to the data source, instructions are sent to the data provider via the command object.
Recordset: A recordset is a group of records, and can either come from a base table or as the result of a query to the table. Transaction: If the OLE DB provider allows it, transactions can be used. Record: This object represents one record in the database, and contains a fields collection. Property: This object is specific to the OLE DB provider and defines an ability that the provider has implemented. Error: When an OLE DB provider error occurs during the use of ADO, an Error object will be created in the Errors collection. Other errors do not go into an Error object, however.
It is built around Microsoft . Though sometimes seen as an evolutionary step up from ADO, some fundamental structural changes were made by Microsoft. MDAC is a continually evolving component framework. As such, there have been several components that were previously part of it but have since been deprecated or removed entirely from the framework.
There were three modules to Jet. Jet data sources was removed from MDAC 2. The Microsoft OLE DB Provider for ODBC, or MSDASQL, was an OLE DB provider for allowing ActiveX Data Objects access to databases via any ODBC driver. Microsoft initially deprecated the MSDASQL component for their 64-bit operating systems and the Microsoft Oracle ODBC driver was later superseded by a . NET Managed Oracle Provider, which supported Oracle 9i. It allowed Microsoft’s relational database to be viewed by XPath and allowed data to viewable as an XML file.
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