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manager for the exported text files, as well as applying a few of the techniques demonstrated earlier, the solution can easily be implemented. To get started, and to follow the guidelines presented at the beginning of the chapter, we ll build a package that exports a single text file and provides the foundation needed for the required functionality. The starter package includes the following components: An OLE DB connection manager that references the source database. A Flat File connection manager that references the destination file location. A data flow task that performs the ETL processing. A set of string variables (some of which are based on expressions) to be used by the other components:

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store the name of the product category for which product data will be exported. As we ll see later on, this variable will be used in many expressions in the package and is at the core of the dynamic behavior we re implementing. @ExportFileName This variable, based on the expression @[User:: CurrentCategoryName] + ".txt", is used to define the name of the file to which to export the product data.

It s Inside Out The GB plane looks superficially identical to the RX plane But mathematically, the two could not be more different! The GB plane is mathematically inside out with respect to the RX plane The center, or origin, of the GB plane represents the point at which there is no conduction for dc or for ac It is the zero-admittance point, rather than the zero-impedance point In the RX plane, the origin represents a perfect short circuit, but in the GB plane, the origin corresponds to a perfect open circuit As you move out toward the right (east) along the G, or conductance, axis of the GB plane, the conductance improves, and the current gets greater When you move upward (north) along the jB axis from the origin, you have ever-increasing positive (capacitive) susceptance When you go down (south) along the jB axis from the origin, you encounter increasingly negative (inductive) susceptance

@ExportFolder This variable, based on the expression @[User::Root Folder] + "TextFileExports\\", is used to define the folder in which the

When you re working from AppleScript, you don t need to activate a workbook as you do when you re working manually in Excel Instead, you can tell AppleScript which workbook you want to manipulate and which actions to take with it For example, you can work with a workbook that the user cannot see without disturbing the active workbook, the workbook they ve been using Other times, you ll want to work with the active workbook so that you can interact with the user s data and the user can see what s happening To access the active workbook via AppleScript, use the active workbook class

exported files will be created. @RootFolder This variable, assigned a filesystem folder path, is used to define the root folder to which the SSIS package is deployed. (It s worth noting that the @RootFolder and @ExportFolder variables aren t technically necessary for this example, but they're useful in real-world packages that use the filesystem like the example does.) @SqlSelectProducts This variable, based on an expression that uses the @CurrentCategoryName variable in a SQL SELECT statement s WHERE clause, is used by the OLE DB Source component in the data flow to SELECT the product records for the current product category. Figure 10 shows these components in the starter package. Remember the whole point of getting the package to this starting point is to provide a functional and tested baseline on which to build the additional expression-based dynamic functionality. We skimmed over the details of getting to this point because there is nothing here that we haven't already seen earlier in the chapter. The next step to take is to update the Flat File connection manager to use an expression based on the @ExportFileName variable for its ConnectionString property. This is as simple as using a property expression for the ConnectionString property, with the following expression: @[User::ExportFolder] + @[User::ExportFileName]. With this property expression in place, the Flat File connection manager will now reference a file in the @ExportFolder folder with the @ExportFileName name, and