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The Product field is in the Report Filter area of your pivot table, and (All) has been selected from its drop-down list. The sales manager would like you to exclude the Cheese and Bran products from the report, and summarize all the other products. You don t see any way to hide some of the products in the Report Filter. Unlike the row and column labels, the Report Filter s drop-down list doesn t have check boxes to indicate which items to show and which to hide. This problem is based on the sample file FoodSales.xlsx.

You can thus use this facility to do the following, among other things: Do a one-time load from files into databases using the insert into select * from <external table> syntax. This is the most common usage of external tables. Get the contents of a text file on the database server in your JDBC layer by using a simple select statement. Of course, all the amazing flexibility that comes along with the select statement is available for you to use. Treat a structured file as a table with individual columns (as we did previously) and run selects on them to get data, which can be filtered or transformed on its way to JDBC. If the file is not structured (it uses a free format) then, in most cases, you could use the new line as a separator to read the data in JDBC using simple selects.

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There s a lot going on in the diagram, so later I ll describe important parts of it with separate use cases and partial-wiring diagrams The shaded area enclosing the signals between NavigatorSearch and CoordinatorSearch represents a background operation NavigatorSearch runs searches in a background thread, because you don t want the UI to freeze up while a search is in progress The system requirements also specify that a search in progress must be interruptible using the Stop button Using a separate thread to run the search on makes it easy to stop the search at any time, without the need to constantly poll the user interface for stop commands CoordinatorSearch controls the threading, and there is no thread-related code anywhere in the system except in CoordinatorSearch.

Table 12-2 shows a comparison of the features of three alternatives useful in server-side text and/or binary file reading and manipulation.

When the user clicks the Search button, NavigatorSearch fires a SearchRequested event to CoordinatorSearch, which spawns a background thread to run the search on By keeping all the threading logic in the Coordinator, you can keep the NavigatorSearch Worker relatively simple..

Can be used to read and write text and binary files. It is the only alternative that supports both text and binary files. Useful in reading and writing text and binary files in userdefined chunk sizes. You can also do random access using functions such as fseek (see the Oracle documentation for further details).

You can change a setting in the Report Filter so it enables you to select items to show or hide. Follow these steps to change the setting:

Ted Faison MainWiringDiagram.vsd 2005-11-25

Useful in using selects to read text data. It is simple to use and allows you to transform/manipulate resulting data using the power that comes with the select statement. Also, the JDBC code is relatively simple and does not have to deal with streams (we use the ResultSet interface to get the data as strings). The maximum size of one row (or chunk) is limited to 4,000 bytes (the size of VARCHAR2 in SQL). Works well in JDBC for most text cases. In free-format texts, one text chunk bounded by the delimiter should not exceed 4,000 bytes (e.g., if the delimiter is a new line, then each line should be less than 4,000 bytes in size).

Although the system uses a Builder and Binder, those two classes don t appear in the wiring diagram, because they don t participate in the ordinary operation of the system. They set up the various parts, wire them together, and then step out of the picture. Since the Builder and Binder work directly with all the top-level classes in the system, they are also at the center of the system s coupling diagram, shown in Figure 11-8.

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