ADO ActiveX data objects by Jason T. Roff

By Jason T. Roff

This e-book is a one-stop consultant to ADO, the common info entry answer from Microsoft that enables quick access to info from a number of codecs and systems. It contains chapters at the Connection, Recordset, box, and Command items and the homes assortment; ADO structure, information shaping, and the ADO occasion version; short introductions to RDS, ADO.NET, and SQL; and a entire alphabetic connection with each ADO item, approach, estate, and occasion.

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This is where all of the information regarding connections is stored. Using a DSN allows you to not worry about the actual definition of the connection string in your application. The details (such as the data-source type and location) are maintained by the ODBC applet on the system you are running your application. When using a DSN, ADO looks up the connection information through the ODBC applet. 1 Installing the DSNs Throughout the rest of this book, I will be using two DSNs. mdb database usually located in the C:\Program Files\Microsoft Visual Studio\VB98 directory when you install Visual Basic.

One of the more flexible features of ADO is that it can offer the developer data providerdefined functions that are not part of the standard ADO specification. For instance, the Microsoft Cursor Service for OLE DB offers dynamic properties that are used to specify how often calculated and aggregate columns are calculated within a data-shaping query. Instead of working with only the lowest common denominator in data-access techniques, ADO allows your application to check for and take advantage of functions that are specific to a particular data provider.

JScript is Microsoft's implementation of JavaScript, designed for script development within HTML documents. Although ADO is meant to offer the same development interface to each language from which it is accessed, some inconsistencies arise because of differences in their syntax and the development environments in which they are used. In this chapter, we will take a look at each of the five languages and learn how to get started developing ADO applications in each. 1 Accessing ADO with Visual Basic Visual Basic is probably the most popular language in which to develop applications for ADO.

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