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functions.php
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<?php
//MySQLi DB Config
$dbhost = "localhost";
$dbusername = "root";
$dbpassword = "12345678";
$dbname = "cp476";
//Create MySQLi object
$conn = new MySQLi($dbhost, $dbusername, $dbpassword, $dbname);
if ($conn->connect_error) {
die("Connection Failed: " . $conn->connect_error);
}
### STUDENT ###
//Add a student
function addStudent($studentID, $studentName) {
global $conn;
if (filter_var($studentID, FILTER_VALIDATE_INT, array("options" => array("min_range"=>111111111, "max_range"=>999999999))) === false || filter_var($studentID, FILTER_SANITIZE_NUMBER_INT) == false) {
return 1;
}
if ($studentName == "") {
return 2;
}
$studentName = htmlspecialchars($studentName, ENT_QUOTES | ENT_HTML5, 'UTF-8');
try {
$stmt = $conn->prepare("INSERT INTO name (`Student ID`, `Student Name`) VALUES (?, ?)");
$stmt->bind_param("is", $studentID, $studentName);
$result = $stmt->execute();
if ($result) {
return 0;
}
return -1;
} catch (Exception $e) {
//handle error
return -1;
}
}
//Update student information
function updateStudent($studentID, $newStudentName) {
global $conn;
if (filter_var($studentID, FILTER_VALIDATE_INT, array("options" => array("min_range"=>111111111, "max_range"=>999999999))) === false || filter_var($studentID, FILTER_SANITIZE_NUMBER_INT) == false) {
return 1;
}
if ($newStudentName == "") {
return 2;
}
$newStudentName = htmlspecialchars($newStudentName, ENT_QUOTES | ENT_HTML5, 'UTF-8');
try {
$stmt = $conn->prepare("UPDATE name SET `Student Name` = ? WHERE `Student ID`= ?");
$stmt->bind_param("si", $newStudentName, $studentID);
$result = $stmt->execute();
if ($result) {
return 0;
}
return -1;
} catch (Exception $e) {
//handle error
return -1;
}
}
//Remove a student
function removeStudent($studentID) {
global $conn;
if (filter_var($studentID, FILTER_VALIDATE_INT, array("options" => array("min_range"=>111111111, "max_range"=>999999999))) === false || filter_var($studentID, FILTER_SANITIZE_NUMBER_INT) == false) {
return 1;
}
try {
$stmt = $conn->prepare("DELETE FROM name WHERE `Student ID` = ?");
$stmt->bind_param("i", $studentID);
$result = $stmt->execute();
if ($result) {
return 0;
}
return -1;
} catch (Exception $e) {
//handle error
return -1;
}
}
//Get all records in name table
function getNameTableRecords() {
global $conn;
try {
$result = $conn->query("SELECT * FROM name");
$rows = array();
if ($result) {
while ($row = $result->fetch_assoc()) {
$rows[] = $row;
}
$result->close();
}
return $rows;
} catch (Exception $e) {
//handle error
return false;
}
}
### COURSE ###
//Add a Course record
function addCourseRecord($studentID, $courseCode, $test1, $test2, $test3, $final) {
global $conn;
if (filter_var($studentID, FILTER_VALIDATE_INT, array("options" => array("min_range"=>111111111, "max_range"=>999999999))) === false) {
return 1;
}
if ($courseCode == "") {
return 2;
}
$courseCode = htmlspecialchars($courseCode, ENT_QUOTES | ENT_HTML5, 'UTF-8');
if (filter_var($test1, FILTER_VALIDATE_FLOAT, array("options" => array("min_range"=>0, "max_range"=>100), "flags" => FILTER_FLAG_ALLOW_FRACTION)) === false) {
return 3;
}
if (filter_var($test2, FILTER_VALIDATE_FLOAT, array("options" => array("min_range"=>0, "max_range"=>100), "flags" => FILTER_FLAG_ALLOW_FRACTION)) === false) {
return 3;
}
if (filter_var($test3, FILTER_VALIDATE_FLOAT, array("options" => array("min_range"=>0, "max_range"=>100), "flags" => FILTER_FLAG_ALLOW_FRACTION)) === false) {
return 3;
}
if (filter_var($final, FILTER_VALIDATE_FLOAT, array("options" => array("min_range"=>0, "max_range"=>100), "flags" => FILTER_FLAG_ALLOW_FRACTION)) === false) {
return 3;
}
try {
$stmt = $conn->prepare("INSERT INTO course (`Student ID`, `Course Code`, `Test 1`, `Test 2`, `Test 3`, `Final`) VALUES (?, ?, ?, ?, ?, ?)");
$stmt->bind_param("isdddd", $studentID, $courseCode, $test1, $test2, $test3, $final);
$result = $stmt->execute();
if ($result) {
return 0;
}
return false;
} catch (Exception $e) {
//handle error
return false;
}
}
//Update Course record
function updateCourse($studentID, $courseCode, $test1, $test2, $test3, $final) {
global $conn;
if (filter_var($studentID, FILTER_VALIDATE_INT, array("options" => array("min_range"=>111111111, "max_range"=>999999999))) === false) {
return 1;
}
if ($courseCode == "") {
return 2;
}
$courseCode = htmlspecialchars($courseCode, ENT_QUOTES | ENT_HTML5, 'UTF-8');
if (filter_var($test1, FILTER_VALIDATE_FLOAT, array("options" => array("min_range"=>0, "max_range"=>100), "flags" => FILTER_FLAG_ALLOW_FRACTION)) === false) {
return 3;
}
if (filter_var($test2, FILTER_VALIDATE_FLOAT, array("options" => array("min_range"=>0, "max_range"=>100), "flags" => FILTER_FLAG_ALLOW_FRACTION)) === false) {
return 3;
}
if (filter_var($test3, FILTER_VALIDATE_FLOAT, array("options" => array("min_range"=>0, "max_range"=>100), "flags" => FILTER_FLAG_ALLOW_FRACTION)) === false) {
return 3;
}
if (filter_var($final, FILTER_VALIDATE_FLOAT, array("options" => array("min_range"=>0, "max_range"=>100), "flags" => FILTER_FLAG_ALLOW_FRACTION)) === false) {
return 3;
}
try {
$stmt = $conn->prepare("UPDATE course SET `Test 1` = ?, `Test 2` = ?, `Test 3` = ?, `Final` = ? WHERE `Student ID` = ? AND `Course Code` = ?");
$stmt->bind_param("ddddis", $test1, $test2, $test3, $final, $studentID, $courseCode);
$result = $stmt->execute();
if ($result) {
return 0;
}
return false;
} catch (Exception $e) {
//handle error
return false;
}
}
//Remove a Course record
function removeCourseRecord($studentID, $courseCode) {
global $conn;
if (filter_var($studentID, FILTER_VALIDATE_INT, array("options" => array("min_range"=>111111111, "max_range"=>999999999))) === false) {
return 1;
}
if ($courseCode == "") {
return 2;
}
$courseCode = htmlspecialchars($courseCode, ENT_QUOTES | ENT_HTML5, 'UTF-8');
try {
$stmt = $conn->prepare("DELETE FROM course WHERE `Student ID` = ? AND `Course Code` = ?");
$stmt->bind_param("is", $studentID, $courseCode);
$result = $stmt->execute();
if ($result) {
return 0;
}
return false;
} catch (Exception $e) {
//handle error
return false;
}
}
//Get all records in Course table
function getCourseRecords() {
global $conn;
try {
$result = $conn->query("SELECT * FROM course");
$rows = array();
if ($result) {
while ($row = $result->fetch_assoc()) {
$rows[] = $row;
}
$result->close();
}
return $rows;
} catch (Exception $e) {
//handle error
return false;
}
}
### Final ###
//Calculate Final Grades
function getAllStudentFinalGrades() {
global $conn;
$sql = "SELECT n.`Student ID`, n.`Student Name`, c.`Course Code`, ROUND((c.`Test 1` * 0.2) + (c.`Test 2` * 0.2) + (c.`Test 3` * 0.2) + (c.`Final` * 0.4), 2) AS `Final Grade`
FROM `name` n
JOIN `course` c ON n.`Student ID` = c.`Student ID`
ORDER BY n.`Student ID`, c.`Course Code`";
$result = $conn->query($sql);
$rows = array();
if ($result->num_rows > 0) {
while($row = $result->fetch_assoc()) {
$rows[] = $row;
}
}
return $rows;
}
?>