Professional SQL server 2008 programming by Robert Vieira

By Robert Vieira

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Turning sqlcmd mode on activates the special sqlcmd scripting options even in the Query window. Be aware that the Query window always utilizes the SQLNativeClient connection method (even when operating in sqlcmd mode), whereas the actual sqlcmd utility will use an OLE DB connection. The result is that you may see slight differences in behavior between running a script using sqlcmd versus using sqlcmd from the Query window. These tend to be corner case differences, and are rarely seen and generally innocuous.

Regardless of the data access method and kind of driver used (SQL Native Client, ODBC, OLE DB), it will always be the driver that talks to the NetLib. The process works as shown in Figure 2-2. The steps in order are: 1. 2. 3. 4. The client app talks to the driver (SQL Native Client, ODBC). The driver calls the client NetLib. This NetLib calls the appropriate network protocol and transmits the data to a server NetLib. The server NetLib then passes the requests from the client to SQL Server. In case you’re familiar with TCP/IP, the default port that the IP NetLib will listen on is 1433.

While transferring your data, we can also apply what are referred to as transformations to that data. Transformations essentially alter the data according to some logical rule(s). The alteration can be as simple as changing a column name, or as complex as an analysis of the integrity of the data and application of rules to change it if necessary. To think about how this is applied, consider the example I gave earlier of taking data from a field that allows NULLs and moving it to a table that doesn’t allow NULLs.

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