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Creating Databases for Web Applications
State capitals quizClasswork: design a new quiz
Homework: Make sure you can upload files and have MySQL database. Get a simple quiz working like the
state capital quiz.Post unique source on REGULAR expressions.
News
• Added a new General Discussion forum.
• Use this for questions, comments, news.– the News forum is intended to be just from the
teacher!
• Use the General Discussion forum for 1 of the 2 homework assignments for today!
State capital quiz
• http://newmedia.purchase.edu/~Jeanine/db/statecapquizask.php
• Choose what to be asked– Note: how can this be worded better????
• Ask• Check the answer
– Give chance to try again or– Go back to get new question
State capitals quiz
• Implementation: three php files. Two of the php files call themselves and include the other file.– statecapitals.php
• This file is include[d] in the others. It sets up 2 parallel arrays holding the names of the states and the capital cities.
– statecapquizask.php• This is a multi-purpose file.
– statecapquizcheck.php• This is also a multi-purpose file. Checks answer. Allows for
another guess or goes back to statecapquizask.php
State capitals storyboard
statecapquiz.php
statecapquizcheck.php
Include file: statecapitals.php
Programming practices
• Parallel structures, in this case the array of states corresponding to the array of capitals, is a common programming device. Think of it as an alternative to a database or xml for simple cases.
• Self-referencing of php scripts is a common practice (mentioned last class)– benefits: reduces number of files. Information in one
place– negatives: the one file is more complex
Materials
• Go to [our] moodle site: http://moodle.purchase.edu– sign in and go to the class.– go to Code Examples– click on StateCapitalQuiz
• NOTE: using View source on the browser does not show the whole php file!
statecapitals.php
<?php$states = Array();$capitals = Array();$states[]="Alabama";$capitals[]="Montgomery";$states[]="Alaska";$capitals[]="Juneau";…
statecapquizask.php<html> <head> <title>State capitals quiz: check</title></head> <body>
<h1>State Capital Quiz </h1><p><?php$saywhich=@$_GET['saywhich'];if ($saywhich){ include("statecapitals.php"); $which=$_GET['which']; $choice=rand(0, sizeOf($states)-1);
if ($which=='state') { $state = $states[$choice]; print("What is the capital of $state?<br>"); print("<form action='statecapquizcheck.php'
method='get'>\n"); print("<input type='text' name='capital'><br>\n"); print("<input type='hidden' name='which'
value=$which>\n"); print("<input type='hidden' name='choice'
value=$choice>\n"); print("<input type='submit' value='Submit
Answer'>"); print("</form>\n"); }
else { $capital = $capitals[$choice]; print("$capital is the capital of which state?<br>");
print("<form action='statecapquizcheck.php' method='get'>\n");
print("<input type='text' name='state'><br>\n"); print("<input type='hidden' name='which' value=$which>\n");
print("<input type='hidden' name='choice' value=$choice>\n");
print("<input type='submit' value='Submit Answer'>");
print("</form>\n"); } }
else { print("Choose form of question: do you want to be given the
state or the capital?<br>"); print("<form action='statecapquizask.php' method='get'>\
n"); print("Ask <input type='radio' name='which'
value='state'>State"); print(" <input type='radio' name='which'
value='capital'>Capital\n"); print("<input type='hidden' name='saywhich' value='true'>\
n"); print("<input type='submit' value='Submit choice'>"); print("</form>"); } ?> </body> </html>
statecapquizcheck.php<html> <head> <title>State capitals quiz:
check</title> </head> <body><?phpinclude('statecapitals.php');$choice=$_GET['choice'];$state=$_GET['state'];$capital=$_GET['capital'];$which=$_GET['which'];$correctstate=$states[$choice];$correctcapital=$capitals[$choice];
if ($which=='state') {
if ($capital == $correctcapital) {
print("Correct! $correctcapital is the capital of $correctstate!");
print("<p><a href='statecapquizask.php'>Play again </a>");
}
else {
print("WRONG!<p>\n"); print("<a href='statecapquizask.php'>New turn </a><p>\
n"); print("OR try again: What is the capital of $correctstate?
<br>"); print("<form action='statecapquizcheck.php' method='get'>\
n"); print("<input type='text' name='capital'><br>\n"); print("<input type='hidden' name='state' value=$state>\n"); print("<input type='hidden' name='which' value=$which>\
n"); print("<input type='hidden' name='choice' value=$choice>\
n"); print("<input type='submit' value='Submit Answer'>"); print("</form>\n"); } }
else {
if ($state == $correctstate) {
print("Correct! The capital of $correctstate is $correctcapital!");
$saywhich='false';
print("<p><a href='statecapquizask.php'>Play again </a>");
}
else {print("WRONG!<p>\n"); print("<a href='statecapquizask.php'>New turn </a><p>\
n"); print("OR try again: $correctcapital is the capital of what
state?<br>"); print("<form action='statecapquizcheck.php' method='get'>\
n");print("<input type='text' name='state'><br>\n"); print("<input type='hidden' name='capital' value=$capital>\
n"); print("<input type='hidden' name='which' value=$which>\
n"); print("<input type='hidden' name='choice' value=$choice>\
n"); print("<input type='submit' value='Submit Answer'>"); print("</form>\n"); } }?>
else { $capital = $capitals[$choice]; print("$capital is the capital of which state?<br>"); print("<form action='statecapquizcheck.php'
method='get'>\n"); print("<input type='text' name='state'><br>\n"); print("<input type='hidden' name='which'
value=$which>\n"); print("<input type='hidden' name='choice'
value=$choice>\n"); print("<input type='submit' value='Submit
Answer'>"); print("</form>\n"); } }
else {print("Choose form of question: do you want to be given
the state or the capital?<br>");print("<form action='statecapquizask.php' method='get'>\
n");print("Ask <input type='radio' name='which'
value='state'>State");print(" <input type='radio' name='which'
value='capital'>Capital\n");print("<input type='hidden' name='saywhich' value='true'>\
n");print("<input type='submit' value='Submit choice'>");print("</form>"); }?></body></html>
Reprise
• if statements within if statements• php produces the appropriate html,
including the form element• The php is printing (producing) html. It is
not operating the quiz!• There are ways to enhance this program
– perhaps limit the number of re-tries
• THIS WILL BE A HOMEWORK ASSIGNMENT!
Classwork (teams)
Design simple quiz • like the state capital quiz, using parallel arrays
for questions and answers – Ideas?
OR• make significant enhancement to my quiz, like
adding scoring, limiting re-tries
OR• some other quiz!
Homework
• Get your quiz working. Post link in posting to the General Discussion Forum.
• Research and post unique source on Regular expressions on the Links and sources forum. We use regular expressions to validate input and extract information from input.
