Professional ADO.NET 2: Programming with SQL Server 2005, by Wallace B. McClure

By Wallace B. McClure

This e-book has loads of solid details. i discovered myself skimming ahead a little bit yet there has been nonetheless plenty of strong details to make me are looking to continue examining. I want there has been occasionally extra clarification of why the writer feels a undeniable manner yet all and all this is often ebook worthy possessing.

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Extra resources for Professional ADO.NET 2: Programming with SQL Server 2005, Oracle, and MySQL

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17 Chapter 2 ❑ Does the name relate to the object on which the actions are being performed? The scope of the procedure is the most vital part of its name. If the procedure is adding customers to a table, then it should contain the word Customer in its name. If the procedure is referring to invoices, then it would include the name Invoice. ❑ Has the procedure been named in a way in which its action can be identified? Whether the stored procedure is performing a simple SELECT, INSERT, UPDATE, or DELETE, or whether it’s performing a more complicated task, you need to pick a name for the action it’s performing.

The DataSet never communicates with any data source and is totally unaware of the source of the data used to populate it. The best way to think of it is as an in-memory repository to store data that has been retrieved. ❑ DataAdapter — The DataAdapter object is what bridges the gap between the DataSet and the data source. The DataAdapter is responsible for retrieving the data from the Command object and populating the DataSet with the data returned. The DataAdapter is also responsible for persisting changes to the DataSet back to the data source.

The JET engine then communicates with ODBC to retrieve the data. Going through this extra translation layer adds unnecessary overhead and makes accessing data through DAO slow. RDO Remote Data Objects (RDO) was Microsoft’s solution to the slow performance created by DAO. For talking to databases other than Microsoft Access, RDO did not use the JET engine like DAO; instead, it communicated directly with the ODBC layer. Figure 1-3 shows this relationship. Removing the JET engine from the call stack greatly improved performance to ODBC data sources.

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