M4
This commit is contained in:
Robert
19
M5/Dossier/.$Aufgabe1.drawio.bkp
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19
M5/Dossier/.$Aufgabe1.drawio.bkp
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91
M5/Dossier/.$Aufgabe1.drawio.dtmp
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M5/Dossier/.$Aufgabe1.drawio.dtmp
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91
M5/Dossier/Aufgabe1.drawio
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91
M5/Dossier/Aufgabe1.drawio
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BIN
M5/Dossier/ERD M4-1-1.png
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M5/Dossier/ERD M4-1-1.png
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153
M5/Dossier/M4.md
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153
M5/Dossier/M4.md
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# Aufgabe 1
|
||||
> Dauer: 2 h
|
||||
## 1)
|
||||
|
||||
## 2) Datenbankentwurf in Relationenschreibweise
|
||||
```sql
|
||||
use emensawerbeseite;
|
||||
|
||||
-- Tabelle 'Ersteller' erstellen
|
||||
CREATE TABLE IF NOT EXISTS Ersteller (
|
||||
EMail VARCHAR(255) PRIMARY KEY,
|
||||
Name VARCHAR(255) DEFAULT 'anonym'
|
||||
);
|
||||
|
||||
-- Tabelle 'Wunschgericht' erstellen
|
||||
CREATE TABLE IF NOT EXISTS Wunschgericht (
|
||||
ID INT AUTO_INCREMENT PRIMARY KEY,
|
||||
Name VARCHAR(255) NOT NULL,
|
||||
Beschreibung TEXT,
|
||||
Erstellungsdatum DATE NOT NULL,
|
||||
Ersteller_EMail VARCHAR(255) NOT NULL,
|
||||
FOREIGN KEY (Ersteller_EMail) REFERENCES Ersteller(EMail)
|
||||
);
|
||||
```
|
||||
## 6)
|
||||
### a)
|
||||
````sql
|
||||
select * from wunschgericht order by Erstellungsdatum desc limit 5;
|
||||
````
|
||||
### b)
|
||||
````sql
|
||||
-- basierend auf M3 6) 4)
|
||||
select ersteller.Name,
|
||||
count(Ersteller_EMail) as anzahl from wunschgericht, ersteller where ersteller.EMail = wunschgericht.Ersteller_EMail
|
||||
group by Ersteller_EMail
|
||||
order by anzahl desc ;
|
||||
````
|
||||
---
|
||||
# Aufgabe 2
|
||||
> Dauer: 2h
|
||||
|
||||
Bei der Übergabe von Daten in die DB müssen diese geprüft werden.
|
||||
Bei der Ausgabe von Daten aus der DB im HTML Code müssen diese Maskiert werden.
|
||||
````php
|
||||
// wunschgericht.php
|
||||
// Zeile 33
|
||||
$sql_ersteller_exists = "SELECT * FROM ersteller WHERE EMail = '" . $ersteller_email . "'";
|
||||
$sql_ersteller_exists = "SELECT * FROM ersteller WHERE EMail = '" . mysqli_real_escape_string($link, $ersteller_email) . "'";
|
||||
|
||||
// Zeile 36
|
||||
$sql_ersteller = "INSERT INTO ersteller(EMail, Name) VALUES ('" . $ersteller_email . "','" . $ersteller_name . "')";
|
||||
$sql_ersteller = "INSERT INTO ersteller(EMail, Name) VALUES ('" . mysqli_real_escape_string($link, $ersteller_email) . "','" . mysqli_real_escape_string($link, $ersteller_name) . "')";
|
||||
|
||||
// Zeile 42
|
||||
$sql = "INSERT INTO wunschgericht(Name, Beschreibung, Erstellungsdatum, Ersteller_EMail) VALUES ('" . $gericht_name . "','" . $gericht_beschreibung . "','". $date ."','" . $ersteller_email . "')";
|
||||
$sql = "INSERT INTO wunschgericht(Name, Beschreibung, Erstellungsdatum, Ersteller_EMail) VALUES ('" . mysqli_real_escape_string($link, $gericht_name) . "','" . mysqli_real_escape_string($link, $gericht_beschreibung) . "','".$date."','" . mysqli_real_escape_string($link, $ersteller_email) . "')";
|
||||
?>
|
||||
````
|
||||
|
||||
````php
|
||||
// index.php
|
||||
// Zeile 43
|
||||
$sql_besucher = "UPDATE besucher_counter SET besucher =".$besucherCount;
|
||||
$sql_besucher = "UPDATE besucher_counter SET besucher =". mysqli_real_escape_string($link, $besucherCount);
|
||||
|
||||
// Zeile 190
|
||||
$tabelle .= "<tr class=\"speisen\"><td>" . $row_gerichte['name'] . " <sup>" . $allergene . "</sup></td><td>" . $preisintern . "€</td><td>" . $preisextern . "€</td><td>Kein Bild in der Datenbank </td></tr>";
|
||||
$tabelle .= "<tr class=\"speisen\"><td>" . htmlspecialchars($row_gerichte['name']) . " <sup>" . htmlspecialchars($allergene) . "</sup></td><td>" . htmlspecialchars($preisintern) . "€</td><td>" . htmlspecialchars($preisextern) . "€</td><td>Kein Bild in der Datenbank </td></tr>";
|
||||
|
||||
|
||||
// Zeile 202
|
||||
$verwendete_allergene_string .= "<sup>".$row_allergen['code']."</sup> ". $row_allergen['name']. ", ";
|
||||
$verwendete_allergene_string .= "<sup>". htmlspecialchars($row_allergen['code']) ."</sup> ". htmlspecialchars($row_allergen['name']) . ", ";
|
||||
|
||||
// Zeile 214f
|
||||
echo $besucherCount;
|
||||
echo $newletterCount;
|
||||
|
||||
echo htmlspecialchars($besucherCount);
|
||||
echo htmlspecialchars($newletterCount);
|
||||
|
||||
// Zeile 220
|
||||
echo $ausgabe["COUNT(id)"];
|
||||
echo htmlspecialchars($ausgabe["COUNT(id)"]);
|
||||
````
|
||||
Bei der Newsletteranmeldung sollte man sich auch ggf. überlegen, wie man die Eingaben prüft un zu vermeiden, das schadhafter Code gespeichert und später abgerufen wird.
|
||||
|
||||
# Aufgabe 4
|
||||
> Dauer 1,5 h
|
||||
1. Eindeutigkeit für die Kombination aus Gericht und Kategorie sicherstellen
|
||||
````sql
|
||||
ALTER TABLE gericht_hat_kategorie
|
||||
ADD CONSTRAINT gericht_kategorie_unique UNIQUE (gericht_id, kategorie_id);
|
||||
````
|
||||
2. In der Tabelle gericht soll eine Abfrage nach Name beschleunigt werden.
|
||||
````sql
|
||||
ALTER TABLE gericht
|
||||
ADD INDEX idx_name (name);
|
||||
````
|
||||
3. Bei Löschung eines Gerichts sollen
|
||||
1) die zugehörigen Zuordnungen zu einer Kategorie sowie
|
||||
````sql
|
||||
ALTER TABLE gericht_hat_kategorie
|
||||
DROP FOREIGN KEY gericht_hat_kategorie_ibfk_1, -- (gericht_id) -> gericht(id)
|
||||
ADD CONSTRAINT gericht_hat_kategorie_ibfk_1_new
|
||||
FOREIGN KEY (gericht_id) REFERENCES gericht(id)
|
||||
ON DELETE CASCADE;
|
||||
````
|
||||
2) die zugehörigen Zuordnungen zu Allergenen automatisch mit gelöscht werden.
|
||||
````sql
|
||||
ALTER TABLE gericht_hat_allergen
|
||||
DROP FOREIGN KEY gericht_hat_allergen_ibfk_2, -- (gericht_id) -> gericht(id)
|
||||
ADD CONSTRAINT gericht_hat_allergen_ibfk_2_new
|
||||
FOREIGN KEY (gericht_id) REFERENCES gericht(id)
|
||||
ON DELETE CASCADE;
|
||||
````
|
||||
4. Eine Kategorie kann nur dann gelöscht werden, wenn
|
||||
1) dieser keine Gerichte zugeordnet sind und
|
||||
````sql
|
||||
ALTER TABLE gericht_hat_kategorie
|
||||
ADD CONSTRAINT fk_gericht_hat_kategorie_kategorie_id
|
||||
FOREIGN KEY (kategorie_id) REFERENCES kategorie(id)
|
||||
ON DELETE RESTRICT;
|
||||
````
|
||||
2) diese keine Kindkategorien besitzt.
|
||||
````sql
|
||||
ALTER TABLE kategorie
|
||||
ADD CONSTRAINT fk_kategorie_eltern_id
|
||||
FOREIGN KEY (eltern_id) REFERENCES kategorie(id)
|
||||
ON DELETE RESTRICT;
|
||||
````
|
||||
5. Wird der Code eines Allergens verändert, so ändert sich dieser Code automatisch in den referenzierenden Datensätzen.
|
||||
````sql
|
||||
ALTER TABLE gericht_hat_allergen
|
||||
DROP FOREIGN KEY gericht_hat_allergen_ibfk_1, -- (code) -> allergen(code)
|
||||
ADD CONSTRAINT gericht_hat_allergen_ibfk_1_new
|
||||
FOREIGN KEY (code) REFERENCES allergen(code)
|
||||
ON UPDATE CASCADE;
|
||||
````
|
||||
6. Eine Kombination aus ``gericht_id`` und ``kategorie_id`` in ``gericht_hat_kategorie`` soll als Primärschlüssel dienen.
|
||||
````sql
|
||||
ALTER TABLE gericht_hat_kategorie
|
||||
ADD PRIMARY KEY (gericht_id, kategorie_id);
|
||||
````
|
||||
|
||||
# Aufgabe 6
|
||||
> Dauer 20 min
|
||||
|
||||
# Aufgabe 7
|
||||
> Dauer 2,5 h
|
||||
|
||||
# Aufgabe 8
|
||||
> Dauer 1 h
|
||||
Reference in New Issue
Block a user