ADO.NET and ADO Examples and Best Practices for VB by William R. Vaughn PDF

By William R. Vaughn

ADO.NET and ADO Examples and top Practices for VB Programmers, moment Edition brings the preferred first version brand new with clean insights and tips about COM-based ADOand provides a voluminous part at the new ADO.NET expertise. Written particularly for COM-based ADO builders retooling for ADO.NET, this can be a developer's e-book, filled with functional suggestion on easy methods to make code run quicker, but be more straightforward to write down and understand.

Veteran writer William Vaughn courses 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 recommendations confirmed to greatly decrease overhead, difficulties, and confusion—for the developer, the method, and the complete group. whereas a few are very simple to enforce, others require huge wisdom and forethought to enable.

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17 Chapter2 By default, ADO uses the OLE DB for ODBC provider, which might not be the best choice for your application-frankly, ODBC should only be used when there are no native OLE DB providers. When you code your ADO program, you choose the provider by taking the default or by naming a specific provider in the Connection object properties. Once connected, you can use other OLE DB providers to construct resultsets, cursors, shapes (hierarchical representations of your data and its relationships to other data sets), or other data structures.

ConnectionString or (at least) the Provider property first, so ADO knows which data provider will be used. You cannot change the Provider property after it is set. 19 Chapter2 These properties are actually documented-exactly where is the question. CHM in its search path. This means that if you want to know what these properties do, you need to look there. I would set up a shortcut to that Help file. CHM was loaded along with the other MSDN CHM files, but there's no telling where it will be on your system-go look for it.

I use this property in client/ server applications to help identify specific clients. However, if your connection is established in the middle tier, changing the WSID argument is pointless-Microsoft Transaction Server sets it for you to keep the connection strings the same so they can be pooled. Connecting Using OLE DB (Wative" Providers On the other hand, if you aren't planning to connect to SQL Server through an ODBC Data Source Name (DSN), you probably won't want to because of performance and security issues I discuss later.

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