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$result = pg_query($link, $queryString) or die('Query failed : ' . pg_last_error($link)); // Close connection pg_close($link); Next, the same action is shown, this time using PDO: try { // Create a new PDO instance $database_handler = new PDO('pgsql:host=localhost;dbname=hatshop', $username, $password); // Prepare the SQL query $statement_handler = $database_handler->prepare('SELECT * FROM product'); // Execute SQL query $statement_handler->execute(); // Retrieve result $result = $statement_handler->fetchAll(); // Clear the PDO object instance $database_handler = null; } catch (PDOException $e) { /* If something goes wrong we catch the exception thrown by the object, print the message and stop the execution of script */ print 'Error! <br />' . $e->getMessage() . '<br />'; exit; } The version of the code that uses PDO is longer, but it includes a powerful error-handling mechanism and prepared statements (which protect you from injection-based attacks). If these concepts sound foreign, once again, wait until the later chapters where we ll put PDO to work, and you ll learn more about it there. Also, when using PDO, you won t need to change the data access code if, for example, you decide to use MySQL instead of PostgreSQL. On the other hand, the first code snippet, which uses PostgreSQL-specific functions, would need to change completely (use mysql_connect and mysql_query instead of pg_connect and pg_query, and so on). In addition, some MySQLspecific functions have different parameters than the similar PostgreSQL functions.

We discussed two font classes in chapter 2: Font and BaseFont. You used the Font class in section 2.2.1 for the 14 standard Type 1 fonts. These fonts are supposed to be known by every PDF viewer and are therefore never embedded by iText. In section 2.2.2, you used the Font class in combination with BaseFont to embed fonts. You created a BaseFont object by telling iText where to find a font program; for instance, a .ttf file. In chapter 3, you needed the BaseFont class to set the font when writing text to the direct content. You ve also learned how to measure Strings in a certain font, how to change the render mode, and so on. You know how to use fonts in your applications, but how do you choose them Which font files can be used with iText How about special writing systems In some languages, you have to write from right to left, and from top to bottom. Furthermore, there are some convenience classes that make it easier to select a font. You ll find the answers to all these questions in this chapter.

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This formula tests the quantity, IF(D6>1000, and if that is true, the sales amount is multiplied by the bonus percentage, B6*4%. If the quantity is not greater than 1,000, the test result is false, and the formula result is 0. To replicate this formula in the Calculated Field, you ll use field names instead of cell references: 6. In the Formula box, type =IF(. 7. In the list of Fields, select Qty, and click Insert Field to add it to the formula. 8. Next, type >1000 followed by a comma. 9. In the list of Fields, select TotalPrice, and click Insert Field to add it to the formula. 10. To complete the formula, type * 4%,0). The completed formula (see Figure 9-26) is as follows: =IF( Qty>1000, TotalPrice*4%,0)

The document also shows which font program and encoding was used, and which iText class was responsible for interpreting the font. In the next subsections, we ll approach this example from different angles. First, let s take a look at the font files that can be used.

When using a database abstraction layer (such as PDO), you ll probably only need to change the connection string when changing the database backend. Note that here we re only talking about the PHP code that interacts with the database. In practice, you might also need to update some SQL queries if the database engines support different dialects of SQL.

Table 11.1 lists the extensions of the files that contain the font metrics or the font program, or both. Type 1 was originally a proprietary specification owned by Adobe, but after Apple introduced TrueType as a competitor, the specification was published, and third-party font manufacturers were allowed to create Type 1 fonts, provided they adhered to the specification. In 1991, Microsoft started using TrueType as its standard font.

Table 11.1 Font type Type 1 font files TrueType font files OpenType font files Font files and their extension Extension .afm, .pfm, .pfb .ttf Description

Figure 9-26. Insert Calculated Field dialog box 11. Click OK to close the Insert Calculated Field dialog box. The new calculated field, Bonus2, appears in the PivotTable Field List pane and in the Values area of the pivot table. For each store with quantity greater than 1,000, the additional bonus amount is 4 percent of its total sales, and the other stores show a zero (see Figure 9-27).

Note To keep your SQL queries as portable as possible, keep their syntax as close as possible to the