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When you add multiple value fields to a pivot table, their headings appear, by default, in the column area. If you prefer, you can move the headings to the row area, where the value fields will be listed vertically instead of horizontally.

xix preface I have lost count of the number of PCs I have worn out since I started my career as a software developer but I will never forget my first computer. I was only 12 years old when I started programming in BASIC. I had to learn English at the same time because there simply weren t any books on computer programming in my mother tongue (Dutch). This was in 1982. Windows didn t exist yet; I worked on a TI99/4A home computer from Texas Instruments. When I told my friends at school about it, they looked at me as if I had just been beamed down from the Starship Enterprise.

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The first text element in the content stream is xix , the Roman page number that appears at the bottom of the page. The fact that the rest of the text reads correctly is a coincidence. It s not necessary for an application to put all the paragraphs in the correct order.

The alternative solution, and the one you ll use when implementing HatShop, can be described like this: 1. Open a connection to the database the first time you need to access the database during a request.

Let s change one line in listing 15.25:

PdfReader reader = new PdfReader(pdf); PdfReaderContentParser parser = new PdfReaderContentParser(reader); PrintWriter out = new PrintWriter(new FileOutputStream(txt)); TextExtractionStrategy strategy; for (int i = 1; i <= reader.getNumberOfPages(); i++) { strategy = parser.processContent(i, new LocationTextExtractionStrategy()); out.println(strategy.getResultantText()); } out.flush(); out.close();

In the PivotTable Field List pane, Excel automatically adds a special field button when multiple value fields are in the layout. You ll use that button to relocate the value fields. 1. Select a cell in the pivot table to activate it. 2. In the PivotTable Field List pane, in the Column Labels area, locate the Values button that represents the value field labels (see Figure 4-11).

2. Execute all database functions (or SQL queries) through that connection without closing it. Here you also need to handle any possible errors. 3. Close the database connection when the client request finishes processing. Using this method, all database operations that happen for a single client request (which happens each time a user visits a new page of our site) will go through a single database connection, avoiding opening and closing the connection each time you need something from the database. You ll still use persistent connections to improve the efficiency of opening a new database connection for each client request. This solution is the one you will use for data access in the HatShop project.

The LocationTextExtractionStrategy class will accept all the TextRenderInfo objects from the processor, just like the simple text-extraction strategy, but it will sort all the snippets of text based on their position on the page, before creating the resultant text. The next example makes this code even more compact by using the PdfTextExtractor class.

PdfReader reader = new PdfReader(pdf); PrintWriter out = new PrintWriter(new FileOutputStream(txt)); for (int i = 1; i <= reader.getNumberOfPages(); i++) { out.println(PdfTextExtractor.getTextFromPage(reader, i)); } out.flush(); out.close();

Now you should learn the theory about how to put this in practice using PHP PDO. You ll effectively write the code a bit later, when building the added functionality into the web site. As explained in 2, you won t access PostgreSQL through PHP s PostgreSQLspecific database functions but through a database abstraction layer (PHP PDO). The PDO classes permit accessing various data sources using the same API (Application Programming Interface), so you won t need to change the PHP data access code or learn different dataaccess techniques when working with database systems other than PostgreSQL (but you might need to change the SQL code itself if the database you migrate to uses a different dialect). Using PHP PDO makes your life as a programmer easier in the long run. The important PHP PDO class you ll work with is PDO, which provides methods for performing various database operations.

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