.NET/Java PDF, Tiff, Barcode SDK Library

There are many resources for nding photographs for your presentations. If you re a good photographer, take your own photographs using a digital camera. But it s most likely that you ll want to visit a stock photography Web site. In photo databases, you ll usually search for graphics based on keywords you enter into a search box, such as clipboard. You ll then see a search results screen similar to the one from the iStockphoto Web site shown in Figure 8-7. It s worth the time to learn how to use advanced search tools to more capably nd what you re looking for. A Web site such as iStockphoto has more than two million graphics, and the search results for common terms will often produce hundreds or thousands of results. Narrow your search using advanced search features based on speci c parameters, such as color, vertical or horizontal orientation, or popularity ratings. When you re looking for photos that have white backgrounds, include the term isolated in your search terms. When you see a photo that s close to what you want but not an exact t, click on it to examine the photo details page, where you might nd related images or access to the artist s portfolio.

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This SQL changes the name column to Christopher where the name column is Chris and the age column equals 25. Therefore, a row where the name is Chris and the age is 21 will not be updated by this example query:

search recursively with new limits. You could even make this easier to use by making the limit specifications optional. You simply add the following conditional to the beginning of the function definition: def search(sequence, number, lower=0, upper=None): if upper is None: upper = len(sequence)-1 ... Now, if you don t supply the limits, they are set to the first and last positions of the sequence. Let s see if this works: >>> >>> >>> [4, >>> 2 >>> 5 seq = [34, 67, 8, 123, 4, 100, 95] seq.sort() seq 8, 34, 67, 95, 100, 123] search(seq, 34) search(seq, 100)

This SQL changes the name column to Christopher on every row of the people table. This demonstrates why it pays to be careful when building SQL queries, as short statements can have big ramifications!

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UPDATE people SET name = "Christopher"

Now that you ve installed SQLite and we ve covered the basics of how SQL works, let s put together a basic demonstration of how it all works in conjunction with Ruby. To do this you re going to write a program that allows you to manipulate a database based on the people table that we ve talked about so far in this chapter. The first step is to write the basic code that can load or create a database. The SQLiteRuby gem makes this simple with the SQLite3::Database.new method. For example:

As you consider where to get graphics, you probably have more readily available graphics than you think, especially if you work in an organization for example, many marketing departments have libraries of photographs that are already licensed for use in presentations. In every case, make sure that you get any permission needed to use the photographs in your presentation and that the photographs are optimized for presentation, not print, use.

require 'rubygems' require 'sqlite3' $db = SQLite3::Database.new("dbfile") $db.results_as_hash = true

But why go to all this trouble, you ask For one thing, you could simply use the list method index, and if you wanted to implement this yourself, you could just make a loop starting at the beginning and iterating along until you found the number. Sure. Using index is just fine. But using a simple loop may be a bit inefficient. Remember I said you needed seven questions to find one number (or position) among 100 And the loop obviously needs 100 questions in the worst-case scenario. Big deal, you say. But if the list has 100,000,000,000,000,000,000,000,000,000,000,000 elements, and the same number of questions with a loop (perhaps a somewhat unrealistic size for a Python list), this sort of thing starts to matter. Binary search would then need only 117 questions. Pretty efficient, huh

From this point you can use $db in a similar way to the file handles you used earlier in this chapter. For example, $db.close will similarly close the database file, just as you closed regular files. The $db.results_as_hash = true line forces SQLite to return data in a hash format rather than as an array of attributes (as with CSV). This makes the results easier to access.

TIP Visit the companion Web site to this book at www.beyondbulletpoints. com for more ideas on how to nd and add graphics to your BBP presentations this online community is dedicated to making the graphic design process faster and easier for you, so be sure to review the range of tools, training and techniques, and templates to make your job easier and faster.