CSY2028-assignment-1/functions.php

<?php
function fetchCats() {
    $pdo = startDB();
	$stmt = $pdo->prepare('SELECT * FROM category');
	$stmt->execute();
	$cats = executeQueryWithoutConstraint('category','*')->fetchAll();

    return $cats;
}

function adminCheck() {
	if(isset($_SESSION['admin'])) {
		if($_SESSION['admin'] != 'y') {
			echo '<script>window.location.href = "../index.php";</script>';
		}
	}
	else {
		echo'<script>window.location.href = "../index.php";</script>';
	}
}

function startDB() {
	$server = 'mysql';
	$username = 'student';
	$password = 'student';
	$schema = 'assignment1';
	$pdo = new PDO('mysql:dbname=' . $schema . ';host=' . $server, $username, $password);
	return $pdo;
}

function checkListing() {
	if (!isset($_GET['listing_id'])) {
		echo '<script>window.location.href = "index.php";</script>';
	}
}

function getListing() {
	return getFirstAllMatches('auction', 'listing_id', $_GET['listing_id']);
}

function populateCatSelect() {
    $cats = fetchCats();
    $output = '';
	foreach ($cats as &$cat) {
	    $output .= '<option value="'. $cat['category_id'] .'">'. $cat['name'] .'</option>';
    }
    return $output;
}

function executeQuery($tableName, $colName, $constraintCol, $constraint) {
	$pdo = startDB();
	$stmt = $pdo->prepare('SELECT '. $colName .' FROM '.$tableName.' WHERE '. $constraintCol .' = :constraint');
	$values = [
		'constraint' => $constraint
	];
	$stmt->execute($values);
	return $stmt;
}

function executeQueryWithoutConstraint($tableName, $colName) {
	$pdo = startDB();
	$stmt = $pdo->prepare('SELECT'.$colName.'FROM '.$tableName);
	$stmt->execute();
	return $stmt;
}

function getFirstMatch($tableName, $colName, $constraintCol, $constraint){
	return executeQuery($tableName, $colName, $constraintCol, $constraint)->fetch();
}

function getEveryMatch($tableName, $colName, $constraintCol, $constraint){
	return executeQuery($tableName, $colName, $constraintCol, $constraint)->fetchAll();
}

function executeAllQuery($tableName, $constraintCol, $constraint) {
	return executeQuery($tableName, '*', $constraintCol, $constraint);
}

function getEveryAllMatches($tableName, $constraintCol, $constraint) {
	return executeAllQuery($tableName, $constraintCol, $constraint)->fetchAll();
}

function getFirstAllMatches($tableName, $constraintCol, $constraint) {
	return executeAllQuery($tableName, $constraintCol, $constraint)->fetch();
}




?>