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<?php
function db_student_new($matrikelnummer,$student) {
date_default_timezone_set("UTC");
$json_student_add = array (
"time" => date('Y-m-d H:i:s', time()),
"cmd" => "student_new",
"matrikelnummer" => $matrikelnummer,
"vorname" => $student["vorname"],
"nachname" => $student["nachname"],
"noten" => $student["noten"]
);
$json_string = json_encode($json_student_add, JSON_UNESCAPED_UNICODE)."\n";
$fh = fopen("database.json", "a");
fwrite($fh,$json_string);
fclose($fh);
//echo $json_string;
}
function db_student_add_fach($matrikelnummer,$fach) {
date_default_timezone_set("UTC");
$cmd = array (
"time" => date('Y-m-d H:i:s', time()),
"cmd" => "student_add_fach",
"matrikelnummer" => $matrikelnummer,
"fach" => $fach
);
$json_string = json_encode($cmd, JSON_UNESCAPED_UNICODE)."\n";
$fh = fopen("database.json", "a");
fwrite($fh,$json_string);
fclose($fh);
}
function db_student_update_note($matrikelnummer,$fach,$teilpruefung,$note) {
date_default_timezone_set("UTC");
$cmd = array (
"time" => date('Y-m-d H:i:s', time()),
"cmd" => "note_upd",
"fach" => $fach,
"teilpruefung" => $teilpruefung,
"note" => $note,
"matrikelnummer" => $matrikelnummer
);
$json_string = json_encode($cmd, JSON_UNESCAPED_UNICODE)."\n";
$fh = fopen("database.json", "a");
fwrite($fh,$json_string);
fclose($fh);
}
function db_group_new($semester,$fach,$gname,$teilnehmerarray) {
date_default_timezone_set("UTC");
$cmd = array (
"time" => date('Y-m-d H:i:s', time()),
"cmd" => "group_new",
"semester" => $semester,
"fach" => $fach,
"name" => $gname,
"teilnehmer" => $teilnehmerarray
);
$json_string = json_encode($cmd, JSON_UNESCAPED_UNICODE)."\n";
$fh = fopen("database.json", "a");
fwrite($fh,$json_string);
fclose($fh);
//echo $json_string;
}
function db_read () {
global $students,$groups,$pfp;
$fh = fopen("database.json", "r");
if ($fh === FALSE) {
echo "<p>Cannot open database.json</p>";
return FALSE;
}
while ($line = fgets($fh)) {
$cmd = json_decode($line,JSON_UNESCAPED_UNICODE);
switch ($cmd["cmd"]) {
case "student_new" :
$matrikelnummer = $cmd["matrikelnummer"];
if (empty($students[$matrikelnummer])) {
$students[$matrikelnummer]["vorname"] = $cmd["vorname"];
$students[$matrikelnummer]["nachname"] = $cmd["nachname"];
$students[$matrikelnummer]["noten"] = $cmd["noten"];
$fach = array_key_first($cmd["noten"]);
$students[$matrikelnummer]["history"][] = $cmd["time"]." student new with ".$fach;
} else {
echo "<p>ERROR: Student ",$matrikelnummer," is already in database.</p>";
}
break;
case "student_add_fach" :
$matrikelnummer = $cmd["matrikelnummer"];
$fach = $cmd["fach"];
if (empty($students[$matrikelnummer])) {
echo "<p>ERROR: Cannot add $fach to $matrikelnummer as student is not in database.</p>";
} elseif (array_key_exists($fach,$students[$matrikelnummer]["noten"])) {
echo "<p>ERROR: $fach already exists for $matrikelnummer in database.</p>";
} else {
$students[$matrikelnummer]["noten"][$fach] = [];
$students[$matrikelnummer]["history"][] = $cmd["time"]." add ".$fach;
}
break;
case "group_new" :
$semester = $cmd["semester"];
$fach = $cmd["fach"];
$gname = $cmd["name"];
if (empty($groups[$semester][$fach][$gname])) {
$groups[$semester][$fach][$gname] = $cmd["teilnehmer"];
} else {
echo "<p>ERROR: Group $gname for $fach in $semester is already in database.</p>";
}
break;
case "note_upd":
$fach = $cmd["fach"];
$teilpruefung = $cmd["teilpruefung"];
$matrikelnummer = $cmd["matrikelnummer"];
$note = $cmd["note"];
$students[$matrikelnummer]["noten"][$fach][$teilpruefung] = $note;
$students[$matrikelnummer]["history"][] = $cmd["time"]." ".$fach."/".$teilpruefung.": ".$note;
break;
default :
echo "<p>ERROR: database cmd ", $cmd["cmd"],"is unknown.</p>";
}
}
fclose($fh);
}
// Search user with name and return matrikelnummer if found
function db_find_user($vorname,$nachname) {
global $students;
foreach ($students as $matrikelnummer => $student) {
if ($student["vorname"] === $vorname and $student["nachname"] === $nachname) {
return $matrikelnummer;
break;
}
}
return FALSE;
}
?>
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