71 lines
2.9 KiB
PHP
71 lines
2.9 KiB
PHP
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<?php # Script 9.5 - ClassRoster.php #2
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// This script performs an INSERT query to add a record to the users table.
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$page_title = 'Class Roster';
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include ('includes/header.html');
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// Check for form submission:
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// echo $_SERVER['REQUEST_METHOD'];
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if ($_SERVER['REQUEST_METHOD'] == 'POST') { //remember the difference between post and get?
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require ('./mysqli_connect.php'); // Connect to the db.
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$errors = array(); // Initialize an error array.
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// Check for an courese information:
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if (empty($_POST['course_name'])) { //$_POST is a global variable. empty() method determines whether a variable is considered to be empty.
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$errors[] = 'You forgot to enter the course name';
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} else {
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$fn = mysqli_real_escape_string($dbc, trim($_POST['course_name'])); //mysqli_real_escape_strin()escapes special characters in a string for use in an SQL statement.
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}
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if (empty($errors)) { // If there is no errors. If everything's OK.
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// Make the query:
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$q = "SELECT CouLongName, CONCAT(SemesterName, Semesters.SemesterYear) as SemesterInf, CONCAT(StuLastName, ', ', StuFirstName) as name from Students, Semesters, Courses, StudentClass, ScheduleOfClasses
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WHERE Students.StudentID=StudentClass.StudentID AND
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ScheduleOfClasses.CourseID=Courses.CourseID AND
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ScheduleOfClasses.ScheduleID=StudentClass.ScheduleID AND
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ScheduleOfClasses.SemesterID=Semesters.SemesterID AND
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CouLongName='$fn'";
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$r = @mysqli_query ($dbc, $q); // Run the query.
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$num = mysqli_num_rows($r);
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if ($num > 0) { // If it ran OK, display the records.
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// Print how many users there are:
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echo "<p>There is the information for the course you are looking for.</p>\n";
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// Table header.
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echo '<table align="center" cellspacing="3" cellpadding="3" width="75%">
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<tr><td align="left"><b>Course Name</b></td><td align="left"><b>Semester</b></td><td align="left"><b>Student Name</b></td></tr>';
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// Fetch and print all the records:
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while ($row = mysqli_fetch_array($r, MYSQLI_ASSOC)) { //MYSQLI_ASSOC makes the returned array assortative.
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echo '<tr><td align="left">' . $row['CouLongName'] . '</td><td align="left">' . $row['SemesterInf'] . '</td><td align="left">' . $row['name'] . '</td></tr>
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';
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}
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echo '</table>'; // Close the table.
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}
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else { // If it did not run OK.
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// Public message:
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echo '<h1>Error</h1>
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<p class="error">There is no course roster match with the information you provided</p>';
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}
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}
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mysqli_close($dbc); // Close the database connection.
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} // End of the main Submit conditional.
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?>
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<h1>Class Roster</h1>
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<form action="ClassRoster.php" method="post">
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<p>Course Name <input type="text" name="course_name" size="15" maxlength="50" value="<?php if (isset($_POST['course_name'])) echo $_POST['course_name']; ?>" /></p>
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<p><input type="submit" name="submit" value="Show Class Roster" /></p>
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</form>
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<?php include ('includes/footer.html'); ?>
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