By Jason T. Roff
This e-book is a one-stop advisor to ADO, the common facts entry resolution from Microsoft that permits easy accessibility 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, strategy, estate, and occasion.
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Extra info for ADO ActiveX data objects
N"); } Although much of the previous example will be very foreign to you until you have a thorough understanding of how to develop applications with ActiveX Data Objects, it is particularly important to notice how Visual C++ applications must convert datatypes returned by a field's value. In Example 3-2, a function called WideCharToMultiByte is used to convert a Variant datatype to a normal char string datatype (ASCII) so that it can in turn be passed to the printf function. 3 Accessing ADO with Visual J++ Like Visual C++, Visual J++ offers a number of ways to access ActiveX Data Objects.
The Error collection and the Error object model are discussed in detail in Chapter 7. 3 Summary This chapter has explained the architecture behind the ActiveX Data Objects technology. The following is a list of some key items pointed out in this chapter: ADO offers a generic data-access interface that is used to communicate with a wide range of proprietary data sources and providers. With ADO, the burden of creating efficient data access is placed upon the individual data provider, not the data-access technology.
The choice of declare and establish a connection with the Connection object or to let the Recordset or Command object handle the work for you. By using your own Connection object, you gain greater control over your data access and manipulation. For instance, with a Connection object, you can execute queries through stored procedures that reside in a data source or through SQL statements that you explicitly declare to your application at runtime. The Connection object also offers transaction management so that at critical points in your data-manipulation code, the integrity of your data source can be preserved if an error were to occur.