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Daniel Schubert
2019-02-28 09:57:43 +01:00
parent cfb12c0aa3
commit c8563fb01e
35 changed files with 378 additions and 12 deletions
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@@ -51,18 +51,7 @@
<section data-transition="slide" data-background="#b5533c" data-background-transition="convex"> <h3>lampp stack</h3> </section>
<section>
<ul>
<li>mysql basics</li>
<li>wordpress tabellen ansehen</li>
<li>apache vhost</li>
<li>letsencrypt</li>
<li></li>
<li></li>
<li></li>
</ul>
</section>
<section>
<pre><code class="bash">~$ sudo apt install apache2 mysql-server phpmyadmin</code></pre>
@@ -80,6 +69,138 @@ MariaDB [(none)]> \q
</ul>
</section>
<section>
<h3>mysql</h3>
</section>
<section>
mysql ist eine „relationale Datenbank”
<p><cite> Relationale Datenbanken versuchen die Realität in einem Datenmodell abzubilden.</cite>
<ul>
<li>Jede Zeile einer Tabelle ist ein Datensatz</li>
<li>Jede Zeile ( Tupel ) besteht aus Attributen ( die Spalten )</li>
<li>Über Primärschlüssel werden Beziehungen hergestellt</li>
<li>Eine Datenbank kann viele Tabellen beinhalten</li>
</ul>
<img src="img/relationales_datenbankmodell_beispiel.jpg">
<p><small style="font-size:.4em">Quelle: http://www.datenbanken-verstehen.de/datenbank-grundlagen/datenbankmodell/relationales-datenbankmodell/</small>
</section>
<section>
<h4>Normalisierung</h4>
Aufteilung der Attribute (Spalten) in mehrere Relationen ( Tabellen ), so dass eine Form ohne Redundanzen entsteht.
</section>
<section>
<img src="img/Aufspaltung_einer_Tabelle_in_zwei_(Beispiel).svg">
</section>
<section>
<img src="img/Wp_Normal_1_301208_165800.JPG">
</section>
<section>
Verbindung aufnehmen:
<pre><code class="bash">~$ sudo mysql
# oder:
~$ mysql -u BENUTZERNAME -p -h localhost
</code></pre>
<ul>
<li class="fragment ">this</li>
</ul>
</section>
<section>Datenbank erstellen
<pre><code class="sql">CREATE DATABASE IF NOT EXISTS test;
USE test;
CREATE TABLE IF NOT EXISTS books (
BookID INT NOT NULL PRIMARY KEY AUTO_INCREMENT,
Title VARCHAR(100) NOT NULL,
SeriesID INT, AuthorID INT);
CREATE TABLE IF NOT EXISTS authors
(id INT NOT NULL PRIMARY KEY AUTO_INCREMENT);
CREATE TABLE IF NOT EXISTS series
(id INT NOT NULL PRIMARY KEY AUTO_INCREMENT);
INSERT INTO books (Title,SeriesID,AuthorID)
VALUES('The Fellowship of the Ring',1,1),
('The Two Towers',1,1), ('The Return of the King',1,1),
('The Sum of All Men',2,2), ('Brotherhood of the Wolf',2,2),
('Wizardborn',2,2), ('The Hobbbit',0,1);</code></pre>
</section>
<section>Tabellen anzeigen
<pre><code class="sql">
SHOW TABLES;
+----------------+
| Tables_in_test |
+----------------+
| authors |
| books |
| series |
+----------------+
3 rows in set (0.00 sec)
</code></pre>
</section>
<section>
<pre><code class="sql">DESCRIBE books;
+----------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+----------+--------------+------+-----+---------+----------------+
| BookID | int(11) | NO | PRI | NULL | auto_increment |
| Title | varchar(100) | NO | | NULL | |
| SeriesID | int(11) | YES | | NULL | |
| AuthorID | int(11) | YES | | NULL | |
+----------+--------------+------+-----+---------+----------------+
</code></pre>
</section>
<section>
Daten anzeigen:
<pre><code class="sql">SELECT * FROM books;
+--------+----------------------------+----------+----------+
| BookID | Title | SeriesID | AuthorID |
+--------+----------------------------+----------+----------+
| 1 | The Fellowship of the Ring | 1 | 1 |
| 2 | The Two Towers | 1 | 1 |
| 3 | The Return of the King | 1 | 1 |
| 4 | The Sum of All Men | 2 | 2 |
| 5 | Brotherhood of the Wolf | 2 | 2 |
| 6 | Wizardborn | 2 | 2 |
| 7 | The Hobbbit | 0 | 1 |
+--------+----------------------------+----------+----------+
7 rows in set (0.00 sec)</code></pre></section>
<section>Daten einfügen:
<pre><code class="sql">INSERT INTO books (Title, SeriesID, AuthorID)
VALUES ("Lair of Bones", 2, 2);
Query OK, 1 row affected (0.00 sec)</code></pre>
<pre><code>SELECT * FROM books;</code></pre></section>
<section>
Daten modifizieren:
<pre><code class="sql">UPDATE books
SET Title = "The Hobbit"
WHERE BookID = 7;
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0</code></pre>
</section>
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<section>