diff --git a/20231207/index-01.html b/20231207/index-01.html
new file mode 100644
index 0000000000000000000000000000000000000000..f6702da84cbbe4cd2cbffe859eba4c3a987f79e0
--- /dev/null
+++ b/20231207/index-01.html
@@ -0,0 +1,8 @@
+<html>
+ <body>
+ <form action="welcome-01.php" method="post">
+ Your name: <input type="text" name="name"><br>
+ <input type="submit">
+ </form>
+ </body>
+</html>
diff --git a/20231207/index-02.html b/20231207/index-02.html
new file mode 100644
index 0000000000000000000000000000000000000000..f03af4ba2891fee02fe1312216263ec9566c06b4
--- /dev/null
+++ b/20231207/index-02.html
@@ -0,0 +1,9 @@
+<html>
+ <body>
+ <form action="welcome-02.php" method="post">
+ Your name: <input type="text" name="name"><br>
+ <input type="hidden" name="answer" value="42">
+ <input type="submit">
+ </form>
+ </body>
+</html>
diff --git a/20231207/school-01.php b/20231207/school-01.php
new file mode 100644
index 0000000000000000000000000000000000000000..fb680c47f34b25db19ddda96de9365b9b3aa4b08
--- /dev/null
+++ b/20231207/school-01.php
@@ -0,0 +1,45 @@
+<html>
+ <body>
+ <?php
+ try
+ {
+ $db = new PDO ('pgsql: host = localhost; dbname = testdb; user = dbs; password = 1234');
+ }
+ catch (\PDOException $e)
+ {
+ echo '<p>';
+ echo $e->getMessage();
+ echo '</p>';
+ echo '<p>';
+ exit ('cannot connect to database');
+ echo '</p>';
+ }
+ $db->exec ('INSERT INTO students (first_name, family_name) VALUES ( '
+ .$_POST["first_name"].', '.$_POST["familty_name"]
+ .' );');
+ $stmt = $db->query ('SELECT * FROM student;');
+ echo '<table><tr>';
+ while ($row = $stmt->fetch())
+ {
+ echo '<tr><td>';
+ echo $row['id'];
+ echo '</td><td>';
+ echo $row['first_name'];
+ echo '</td><td>';
+ echo $row['family_name'];
+ echo '</td></tr>';
+ }
+ echo '</tr></table>';
+ ?>
+ </body>
+</html>
+
+<!-- Aus den Log-Dateien des Web-Servers:
+
+ [Thu Dec 07 12:50:06.952167 2023] [php:error] [pid 163970] [client ::1:52394]
+ PHP Fatal error: Uncaught PDOException: SQLSTATE[42601]: Syntax error: 7
+ FEHLER: Syntaxfehler bei \xc2\xbb)\xc2\xab\nLINE 1: ... INTO students
+ (first_name, family_name) VALUES ( Peter, );\n
+ ^ in /var/www/dbs/school-01.php:17\nStack trace:\n#0
+ /var/www/dbs/school-01.php(17): PDO->exec()\n#1 {main}\n thrown in
+ /var/www/dbs/school-01.php on line 17
diff --git a/20231207/school-02.php b/20231207/school-02.php
new file mode 100644
index 0000000000000000000000000000000000000000..21016a853166631c95ee48667d9de772484dd5e3
--- /dev/null
+++ b/20231207/school-02.php
@@ -0,0 +1,47 @@
+<html>
+ <body>
+ <?php
+ try
+ {
+ $db = new PDO ('pgsql: host = localhost; dbname = testdb; user = dbs; password = 1234');
+ }
+ catch (\PDOException $e)
+ {
+ echo '<p>';
+ echo $e->getMessage();
+ echo '</p>';
+ echo '<p>';
+ exit ('cannot connect to database');
+ echo '</p>';
+ }
+ $db->exec ("INSERT INTO students (first_name, family_name) VALUES ( '"
+ .$_POST["first_name"]."', '".$_POST["family_name"]
+ ."' );");
+ $stmt = $db->query ('SELECT * FROM students;');
+ echo '<table><tr>';
+ while ($row = $stmt->fetch())
+ {
+ echo '<tr><td>';
+ echo $row['id'];
+ echo '</td><td>';
+ echo $row['first_name'];
+ echo '</td><td>';
+ echo $row['family_name'];
+ echo '</td></tr>';
+ }
+ echo '</tr></table>';
+ ?>
+ </body>
+</html>
+
+<!-- Aus den Log-Dateien des Web-Servers:
+
+ [Thu Dec 07 12:50:06.952167 2023] [php:error] [pid 163970] [client ::1:52394]
+ PHP Fatal error: Uncaught PDOException: SQLSTATE[42601]: Syntax error: 7
+ FEHLER: Syntaxfehler bei \xc2\xbb)\xc2\xab\nLINE 1: ... INTO students
+ (first_name, family_name) VALUES ( Peter, );\n
+ ^ in /var/www/dbs/school-01.php:17\nStack trace:\n#0
+ /var/www/dbs/school-01.php(17): PDO->exec()\n#1 {main}\n thrown in
+ /var/www/dbs/school-01.php on line 17
+
+-->
diff --git a/20231207/school.html b/20231207/school.html
new file mode 100644
index 0000000000000000000000000000000000000000..4299afcc1b7f4d6b8373dae2028d0c5266fa2e50
--- /dev/null
+++ b/20231207/school.html
@@ -0,0 +1,10 @@
+<html>
+ <body>
+ <h3>Register new student</h3>
+ <form action="school-02.php" method="post">
+ First name: <input type="text" name="first_name"><br>
+ Family name: <input type="text" name="family_name"><br>
+ <input type="submit">
+ </form>
+ </body>
+</html>
diff --git a/20231207/tiere-01.php b/20231207/tiere-01.php
new file mode 100644
index 0000000000000000000000000000000000000000..734d14467ee386516252f23c27d2b7c2d0a39c26
--- /dev/null
+++ b/20231207/tiere-01.php
@@ -0,0 +1,32 @@
+<html>
+ <body>
+ <?php
+ $db = new PDO ('pgsql: host = localhost; dbname = testdb; user = dbs; password = abcd');
+ $stmt = $db->query ('SELECT * FROM tier;');
+ echo '<table><tr>';
+ while ($row = $stmt->fetch())
+ {
+ echo '<tr><td>';
+ echo $row['name'];
+ echo '</td><td>';
+ echo $row['tierart'];
+ echo '</tr></tr>';
+ }
+ echo '</tr></table>';
+ ?>
+ </body>
+</html>
+
+<!-- Aus den Log-Dateien des Web-Servers:
+
+ [Thu Dec 07 12:27:14.834918 2023] [php:error] [pid 130668] [client ::1:60980]
+ PHP Fatal error: Uncaught PDOException: SQLSTATE[08006] [7] connection to
+ server at "localhost" (::1), port 5432 failed: FATAL:
+ Passwort-Authentifizierung f\xc3\xbcr Benutzer \xc2\xbbdbs\xc2\xab
+ fehlgeschlagen\nconnection to server at "localhost" (::1), port 5432 failed:
+ FATAL: Passwort-Authentifizierung f\xc3\xbcr Benutzer \xc2\xbbdbs\xc2\xab
+ fehlgeschlagen in /var/www/dbs/tiere-01.php:4\nStack trace:\n#0
+ /var/www/dbs/tiere-01.php(4): PDO->__construct()\n#1 {main}\n thrown in
+ /var/www/dbs/tiere-01.php on line 4
+
+-->
diff --git a/20231207/tiere-02.php b/20231207/tiere-02.php
new file mode 100644
index 0000000000000000000000000000000000000000..0df5e72048b7aa3f734e3193b52859e57d952ccb
--- /dev/null
+++ b/20231207/tiere-02.php
@@ -0,0 +1,34 @@
+<html>
+ <body>
+ <?php
+ try
+ {
+ $db = new PDO ('pgsql: host = localhost; dbname = testdb; user = dbs; password = abcd');
+ }
+ catch (\PDOException $e)
+ {
+ echo $e->getMessage();
+ }
+ $stmt = $db->query ('SELECT * FROM tier;');
+ echo '<table><tr>';
+ while ($row = $stmt->fetch())
+ {
+ echo '<tr><td>';
+ echo $row['name'];
+ echo '</td><td>';
+ echo $row['tierart'];
+ echo '</tr></tr>';
+ }
+ echo '</tr></table>';
+ ?>
+ </body>
+</html>
+
+<!-- Aus den Log-Dateien des Web-Servers:
+
+ [Thu Dec 07 12:32:31.413292 2023] [php:error] [pid 163972] [client ::1:55210]
+ PHP Fatal error: Uncaught Error: Call to a member function query() on null in
+ /var/www/dbs/tiere-02.php:12\nStack trace:\n#0 {main}\n thrown in
+ /var/www/dbs/tiere-02.php on line 12
+
+-->
diff --git a/20231207/tiere-03.php b/20231207/tiere-03.php
new file mode 100644
index 0000000000000000000000000000000000000000..93941fe6a7e616cd33647f4c851cf47289128c9b
--- /dev/null
+++ b/20231207/tiere-03.php
@@ -0,0 +1,30 @@
+<html>
+ <body>
+ <?php
+ try
+ {
+ $db = new PDO ('pgsql: host = localhost; dbname = testdb; user = dbs; password = abcd');
+ }
+ catch (\PDOException $e)
+ {
+ echo '<p>';
+ echo $e->getMessage();
+ echo '</p>';
+ echo '<p>';
+ exit ('cannot connect to database');
+ echo '</p>';
+ }
+ $stmt = $db->query ('SELECT * FROM tier;');
+ echo '<table><tr>';
+ while ($row = $stmt->fetch())
+ {
+ echo '<tr><td>';
+ echo $row['name'];
+ echo '</td><td>';
+ echo $row['tierart'];
+ echo '</tr></tr>';
+ }
+ echo '</tr></table>';
+ ?>
+ </body>
+</html>
diff --git a/20231207/tiere-04.php b/20231207/tiere-04.php
new file mode 100644
index 0000000000000000000000000000000000000000..5f78851f6aad553a863c30eebecdcf6b3a454f1c
--- /dev/null
+++ b/20231207/tiere-04.php
@@ -0,0 +1,29 @@
+<html>
+ <body>
+ <?php
+ try
+ {
+ $db = new PDO ('pgsql: host = localhost; dbname = testdb; user = dbs; password = abcd');
+ }
+ catch (\PDOException $e)
+ {
+ echo '<p>';
+ echo $e->getMessage();
+ echo '</p>';
+ echo '<p>';
+ exit ("cannot connect to database\n</p></body></html>");
+ }
+ $stmt = $db->query ('SELECT * FROM tier;');
+ echo '<table><tr>';
+ while ($row = $stmt->fetch())
+ {
+ echo '<tr><td>';
+ echo $row['name'];
+ echo '</td><td>';
+ echo $row['tierart'];
+ echo '</tr></tr>';
+ }
+ echo '</tr></table>';
+ ?>
+ </body>
+</html>
diff --git a/20231207/tiere-05.php b/20231207/tiere-05.php
new file mode 100644
index 0000000000000000000000000000000000000000..59903734d3fa17ddf490ffcb3691e2b20aac2912
--- /dev/null
+++ b/20231207/tiere-05.php
@@ -0,0 +1,30 @@
+<html>
+ <body>
+ <?php
+ try
+ {
+ $db = new PDO ('pgsql: host = localhost; dbname = testdb; user = dbs; password = 1234');
+ }
+ catch (\PDOException $e)
+ {
+ echo '<p>';
+ echo $e->getMessage();
+ echo '</p>';
+ echo '<p>';
+ exit ('cannot connect to database');
+ echo '</p>';
+ }
+ $stmt = $db->query ('SELECT * FROM tier;');
+ echo '<table><tr>';
+ while ($row = $stmt->fetch())
+ {
+ echo '<tr><td>';
+ echo $row['name'];
+ echo '</td><td>';
+ echo $row['tierart'];
+ echo '</tr></tr>';
+ }
+ echo '</tr></table>';
+ ?>
+ </body>
+</html>
diff --git a/20231207/welcome-01.php b/20231207/welcome-01.php
new file mode 100644
index 0000000000000000000000000000000000000000..de6e75cb85dc696080b2320ae3d767460d847303
--- /dev/null
+++ b/20231207/welcome-01.php
@@ -0,0 +1,5 @@
+<html>
+ <body>
+ Hello, <?php echo $_POST["name"]; ?>!
+ </body>
+</html>
diff --git a/20231207/welcome-02.php b/20231207/welcome-02.php
new file mode 100644
index 0000000000000000000000000000000000000000..ba73e932fd2d89a96870a736b9e453191d5e786a
--- /dev/null
+++ b/20231207/welcome-02.php
@@ -0,0 +1,6 @@
+<html>
+ <body>
+ Hello, <?php echo $_POST["name"]; ?>!<br/>
+ The answer is <?php echo $_POST["answer"]; ?>.
+ </body>
+</html>