By William R. Vaughn
ADO.NET and ADO Examples and most sensible Practices for VB Programmers, moment Edition brings the preferred first variation brand new with clean insights and tips about COM-based ADOand provides a voluminous part at the new ADO.NET know-how. Written particularly for COM-based ADO builders retooling for ADO.NET, it is a developer's booklet, filled with useful suggestion on the right way to make code run swifter, but be more straightforward to put in writing and understand.
Veteran writer William Vaughn publications you thru the information entry maze with working examples and diverse discussions of what works and what does not. Derived from years of expertise operating with info entry builders, Vaughn's Best Practices are a collection of suggestions confirmed to enormously lessen overhead, difficulties, and confusion—for the developer, the process, and the total crew. whereas a few are very simple to enforce, others require massive wisdom and forethought to enable.
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Extra resources for ADO.NET and ADO Examples and Best Practices for VB Programmers
30 Getting Con nected The ADO Connection Object The ADO Connection object is your pipeline (almost literally) to client/ server data sources. Although you might not realize it, ADO often creates a Connection object for you behind the scenes if you don't explicitly code one yourself. ), and I discuss them in this chapter, but suffice it to say that you usually need to build a Connection object at one point or another. Your Connection object is used to select a data source provider and gather up properties that are passed to the underlying data and service providers-such as ODBC, OLE DB, or cursor providers.
Conneetion If you follow this best practice coding convention, your applications will run a little faster, and you'll also avoid crippling some of the features provided by ADO when working with multiple-resultset stored procedures. I explain that later in Chapter6. NET where many (okay, most) of the COM performance tips I discuss in these early chapters no longer apply. I fill you in on these new game rules when I get to Chapter 13. TIP My students ask me if they need to use theADODB qualifier when coding their Dim statements.
Without the SA's cooperation you can't possibly have success with any data access application. Using the SA's account and password is the quickest possible way to make that person very (very) upset-not to mention the serious security breach you have created. A Connection object represents a unique session with a data source. In the case of a client/ server database system, it may be equivalent to an actual network connection to the server. Depending on the functionality supported by the provider, some collections, methods, or properties of a Connection object might not be available.
ADO.NET and ADO Examples and Best Practices for VB Programmers by William R. Vaughn