Political Systems of Highland Burma: A Study of Kachin by Edmund Ronald Leach

By Edmund Ronald Leach

Publication by means of Leach, Edmund Ronald

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Extra info for Political Systems of Highland Burma: A Study of Kachin Social Structure (London School of Economics Monographs on Social Anthropology)

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You should then be able to run queries against it, and to traverse and display the result set. In the next chapter, we will deal with a very important aspect of any database-driven application—error handling. We will also extend our example application by giving it the ability to add and edit books and authors, thus making it more realistic and useful. [ 46 ] Error Handling Now that we have built our first application that uses PDO, we will take a closer look at an important aspect of user-friendly web applications—error handling.

Id=1. The following screen should appear: [ 37 ] Using PHP Data Objects: First Steps As you can see, everything is correct on the page: The author's details, which we filed first (id=1), and the only book by this author. Now let's see how our application reacts to an invalid ID submitted. We know that we have only three authors, so any number other than 1, 2, or 3 is invalid. Also, a non-number parameter will evaluate to 0, which is invalid. id=zzz. php and see that this page also works with this database.

Note that the class does not necessarily have these properties declared since PHP allows runtime creation of object properties. For example: $q = $conn->query('SELECT * FROM authors ORDER BY lastName, firstName'); $q->setFetchMode(PDO::FETCH_CLASS, stdClass); while($r = $q->fetch()) { var_dump($r); } This will print output similar to that for the previous example. ) We would recommend using PDOStatement::setFetchMode() as it is more convenient and easier to maintain (and, of course, has more features).

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