Merge pull request #3 from Crylia/database

Database
2024-07-06 11:45:56 +02:00
parent 55c49a9e83 1c8fa4c7c4
commit 981c2f27d1
8 changed files with 778 additions and 0 deletions
--- a/DBHandler/DBHandler.cpp
+++ b/DBHandler/DBHandler.cpp
@@ -0,0 +1,25 @@
+#include "DBHandler.hpp"
+
+#include <iostream>
+//host = localhost port = 5432 dbname = postgres user = postgres password = ****
+
+
+DBHandler::DBHandler(std::string connStr) : connectionObject(connStr.c_str()) {
+    try {
+        if (connectionObject.is_open()) {
+            std::cout << "Databased connected" << std::endl;
+        }
+        else
+            std::cout << "Failed to connect to Databased" << std::endl;
+    }
+    catch (const std::exception& e) {
+        std::cerr << "Error: " << e.what() << std::endl;
+    }
+};
+
+
+ 
+  
+
+
+
--- a/DBHandler/DBHandler.hpp
+++ b/DBHandler/DBHandler.hpp
@@ -0,0 +1,14 @@
+#ifndef DBHANDLER_HPP_
+#define DBHANDLER_HPP_
+#include <pqxx/pqxx>
+#include <string>
+
+class DBHandler {
+protected:
+	pqxx::connection connectionObject;
+
+public:
+	DBHandler(std::string connStr);
+};
+
+#endif
--- a/DBHandler/DBLogin.cpp
+++ b/DBHandler/DBLogin.cpp
@@ -0,0 +1,41 @@
+#include "DBLogin.hpp"
+#include <iostream>
+
+DBLogin::DBLogin(std::string connStr) : DBHandler(connStr) {};
+
+
+
+/*
+
+return 1 if admin | 0 if not admin | -1 if failed
+
+*/
+
+int DBLogin::checkValidLogin(std::string id, std::string pw) {
+
+    try {
+        pqxx::work worker(connectionObject);
+
+        std::string query =
+            "SELECT admin FROM studenten_veranstalter WHERE id = $1 AND passwort = $2";
+
+        pqxx::result response = worker.exec_params(query, id, pw);
+
+        if (response.affected_rows() > 0) {
+
+           
+            if (response[0][0].is_null())
+                return 0;
+            return response[0][0].as<bool>();
+
+        }
+
+        return -1;
+    }
+    catch (const std::exception& e) {
+        std::cerr << "Error: " << e.what() << std::endl;
+    }
+
+}
+
+
--- a/DBHandler/DBLogin.hpp
+++ b/DBHandler/DBLogin.hpp
@@ -0,0 +1,18 @@
+#ifndef _DBLOGIN_HPP_
+#define _DBLOGIN_HPP_
+#include "DBHandler.hpp"
+
+class DBLogin : public DBHandler {
+public:
+	DBLogin(std::string connStr);
+	/*
+
+return 1 if admin | 0 if not admin | -1 if failed
+
+*/
+	int checkValidLogin(std::string id, std::string pw);
+};
+
+
+
+#endif
--- a/DBHandler/DBPlan.cpp
+++ b/DBHandler/DBPlan.cpp
@@ -0,0 +1,477 @@
+#include "DBPlan.hpp"
+
+DBPlan::DBPlan(std::string connStr) : DBHandler(connStr) {
+};
+
+
+void DBPlan::vertretung(std::string tag, std::string stunde, std::string dauer) {
+    try {
+        std::string prevStunde = std::to_string(std::stoi(stunde) - 1);
+        std::string cap = std::to_string(18 - std::stoi(dauer));
+        std::string nextStunde;
+        std::string nextTag = tag;
+        std::string prevTag = tag;
+        if (dauer == "4") {
+           
+           nextStunde = std::to_string(std::stoi(stunde) + 2);
+           std::cout << nextStunde << std::endl;
+        }
+        else {
+           nextStunde = std::to_string(std::stoi(stunde) + 1);
+           std::cout << nextStunde << std::endl;
+        }
+
+        if (prevStunde == "0") {
+            prevStunde = "5";
+            prevTag = std::to_string(std::stoi(tag) - 1);
+            if (prevTag == "0") {
+                prevTag = "5";
+            }
+        }
+
+        if (nextStunde == "6") {
+            nextStunde = "1";
+            nextTag = std::to_string(std::stoi(tag)+1);
+            if (nextTag == "6") {
+                nextTag = "1";
+            }
+        }
+
+        pqxx::work worker(connectionObject);
+
+        
+        std::string query =
+            "UPDATE Veranstalter_Veranstaltung_Uhrzeit SET Veranstalter_ID = "
+            "(SELECT ID FROM Veranstalter WHERE ID != (SELECT Veranstalter_ID FROM Veranstalter_Veranstaltung_Uhrzeit WHERE uhrzeit_id = $1 AND tag = $2) "
+            "AND ID != (SELECT Veranstalter_ID FROM Veranstalter_Veranstaltung_Uhrzeit WHERE uhrzeit_id = $3 AND tag = $4) LIMIT 1) WHERE uhrzeit_id = $5 AND tag = $6; ";
+       
+
+        pqxx::result response = worker.exec_params(query, prevStunde, prevTag, nextStunde, nextTag, stunde, tag);
+       
+        worker.commit();
+        
+
+    }
+    catch (const std::exception& e) {
+        std::cerr << "Error: " << e.what() << std::endl;
+
+    }
+}
+
+void DBPlan::sucheVertretung(std::string tag, std::string stunde) {
+    std::string dauer = getDauer(tag, stunde);
+    vertretung(tag, stunde, dauer);
+    incarbeitszeit(tag, stunde, dauer);
+
+    if (dauer == "4") {
+        upperHour(tag, stunde);
+    }
+
+ 
+
+}
+
+void DBPlan::meldeKrank(std::string id, std::string tag, std::string stunde) {
+
+    try {
+        
+        pqxx::work worker(connectionObject);
+        std::string query =
+            "UPDATE Veranstalter SET krank = TRUE WHERE ID = $1";
+
+        pqxx::result response = worker.exec_params(query, id);
+        worker.commit();
+        
+        sucheVertretung(tag, stunde);
+        meldeGesund(id);
+
+    }
+    catch (const std::exception& e) {
+        std::cerr << "Error: " << e.what() << std::endl;
+
+    }
+}
+
+
+void DBPlan::meldeGesund(std::string id) {
+    try {
+        pqxx::work worker(connectionObject);
+        std::string query =
+            "UPDATE Veranstalter SET krank = FALSE WHERE ID = $1";
+
+        pqxx::result response = worker.exec_params(query, id);
+        worker.commit();
+    }
+    catch (const std::exception& e) {
+        std::cerr << "Error: " << e.what() << std::endl;
+    }
+}
+
+
+
+
+void DBPlan::deleteVeranstalterForeign(std::string id) {
+    try {
+        pqxx::work worker(connectionObject);
+        std::string query =
+            "UPDATE Veranstalter_Veranstaltung_Uhrzeit SET Veranstalter_ID = NULL WHERE Veranstalter_ID = $1;";
+
+        pqxx::result response = worker.exec_params(query, id);
+        worker.commit();
+    }
+    catch (const std::exception& e) {
+        std::cerr << "Error: " << e.what() << std::endl;
+    }
+}
+
+void DBPlan::deleteVeranstalter(std::string id) {
+
+    deleteVeranstalterForeign(id);
+    
+    try {
+        pqxx::work worker(connectionObject);
+        std::string query =
+            "DELETE FROM Veranstalter WHERE ID = $1";
+
+        pqxx::result response = worker.exec_params(query, id);
+        worker.commit();
+    }
+    catch (const std::exception& e) {
+        std::cerr << "Error: " << e.what() << std::endl;
+    }
+}
+
+
+void DBPlan::deleteVeranstaltungForeign(std::string id) {
+    try {
+        pqxx::work worker(connectionObject);
+        std::string query =
+            "UPDATE Veranstalter_Veranstaltung_Uhrzeit SET Veranstaltung_ID = NULL WHERE Veranstalter_ID = $1;";
+
+        pqxx::result response = worker.exec_params(query, id);
+        worker.commit();
+    }
+    catch (const std::exception& e) {
+        std::cerr << "Error: " << e.what() << std::endl;
+    }
+}
+
+void DBPlan::deleteVeranstaltung(std::string id) {
+    deleteVeranstaltungForeign(id);
+
+    try {
+        pqxx::work worker(connectionObject);
+        std::string query =
+            "DELETE FROM Veranstaltung WHERE ID = $1";
+
+        pqxx::result response = worker.exec_params(query, id);
+        worker.commit();
+    }
+    catch (const std::exception& e) {
+        std::cerr << "Error: " << e.what() << std::endl;
+    }
+
+}
+
+
+void DBPlan::hinzufuegenVeranstaltung(std::string name, std::string dauer, std::string ort, std::string raum) {
+    try {
+        pqxx::work worker(connectionObject);
+        std::string query =
+            "INSERT INTO Veranstaltung (name, dauer, ort, raum) VALUES ($1, $2, $3, $4);";
+        pqxx::result response = worker.exec_params(query, name, dauer, ort, raum);
+        worker.commit();
+    }
+    catch (const std::exception& e) {
+        std::cerr << "Error: " << e.what() << std::endl;
+    }
+
+}
+
+
+void DBPlan::hinzufuegenVeranstalter(std::string email, std::string name, std::string pw, std::string admin) {
+    try {
+        pqxx::work worker(connectionObject);
+        std::string query =
+            "INSERT INTO Veranstaltung (email, name, pw, admin) VALUES ($1, $2, $3, $4);";
+        pqxx::result response = worker.exec_params(query, email, name, pw, admin);
+        worker.commit();
+    }
+    catch (const std::exception& e) {
+        std::cerr << "Error: " << e.what() << std::endl;
+    }
+
+}
+
+
+void DBPlan::deleteStudent(std::string id) {
+    try {
+        pqxx::work worker(connectionObject);
+        std::string query =
+            "DELETE FROM studenten WHERE ID = $1;";
+        pqxx::result response = worker.exec_params(query, id);
+        worker.commit();
+    }
+    catch (const std::exception& e) {
+        std::cerr << "Error: " << e.what() << std::endl;
+    }
+
+}
+
+
+void DBPlan::hinzufuegenStudent(std::string email, std::string name, std::string pw) {
+
+    try {
+        pqxx::work worker(connectionObject);
+        std::string query =
+            "INSERT INTO studenten (email, name, pw) VALUES ($1, $2, $3);";
+        pqxx::result response = worker.exec_params(query, email, name, pw);
+        worker.commit();
+    }
+    catch (const std::exception& e) {
+        std::cerr << "Error: " << e.what() << std::endl;
+    }
+
+
+}
+
+
+
+std::string DBPlan::getDauer(std::string tag, std::string stunde) {
+    try {
+        pqxx::work worker(connectionObject);
+        std::string query =
+            "SELECT dauer FROM Veranstaltung WHERE ID = (SELECT Veranstaltung_ID FROM Veranstalter_Veranstaltung_Uhrzeit WHERE uhrzeit_id = $1 AND tag = $2);";
+       
+        pqxx::result response = worker.exec_params(query, stunde, tag);
+        
+        worker.commit();
+        
+        
+        return response[0][0].c_str();
+    }
+    catch (const std::exception& e) {
+        std::cerr << "Error: " << e.what() << std::endl;
+    }
+}
+
+
+
+
+
+
+
+
+
+
+void DBPlan::addFirstOfDayTwo(std::string tag) {
+    try {
+        pqxx::work worker(connectionObject);
+        std::string query =
+            "UPDATE Veranstalter_Veranstaltung_Uhrzeit SET Veranstalter_ID = (SELECT ID FROM Veranstalter WHERE arbeitszeit <= 16 AND krank = FALSE LIMIT 1) "
+            "WHERE uhrzeit_id = 1 AND tag = $1;";
+        pqxx::result response = worker.exec_params(query, tag);
+        worker.commit();
+      
+    }
+    catch (const std::exception& e) {
+        std::cerr << "Error: " << e.what() << std::endl;
+    }
+}
+
+void DBPlan::addTwoHour(std::string tag, std::string stunde) {
+    try {
+        
+        std::string prevStunde = std::to_string(std::stoi(stunde) - 1);
+
+        std::cout  << " prevStunde: " << prevStunde << " Tag: " << tag << " stunde " << stunde << std::endl;
+        pqxx::work worker(connectionObject);
+        std::string query =
+            "UPDATE Veranstalter_Veranstaltung_Uhrzeit SET Veranstalter_id = (SELECT ID FROM Veranstalter "
+               "WHERE arbeitszeit <= 16 AND krank = FALSE "
+               "AND(standort = (SELECT ort FROM Veranstaltung WHERE ID = (SELECT veranstaltung_ID FROM Veranstalter_Veranstaltung_Uhrzeit WHERE uhrzeit_id = $1 AND tag = $2)) "
+                   "AND ID != (SELECT veranstalter_ID FROM Veranstalter_Veranstaltung_Uhrzeit WHERE uhrzeit_id = $1 AND tag = $2)) "
+              "ORDER BY random() LIMIT 1) "
+           "WHERE uhrzeit_id = $3 AND tag = $4;";
+        pqxx::result response = worker.exec_params(query, prevStunde, tag, stunde, tag);
+        worker.commit();
+
+    }
+    catch (const std::exception& e) {
+        std::cerr << "Error: " << e.what() << std::endl;
+    }
+}
+
+void DBPlan::addFirstOfDayFour(std::string tag) {
+    try {
+        pqxx::work worker(connectionObject);
+        std::string query =
+            "UPDATE Veranstalter_Veranstaltung_Uhrzeit SET Veranstalter_ID = (SELECT ID FROM Veranstalter WHERE arbeitszeit <= 14 AND krank = FALSE LIMIT 1) "
+            "WHERE uhrzeit_id = 1 AND tag = $1;";
+        pqxx::result response = worker.exec_params(query, tag);
+        worker.commit();
+
+    }
+    catch (const std::exception& e) {
+        std::cerr << "Error: " << e.what() << std::endl;
+    }
+}
+
+void DBPlan::addFourHour(std::string tag, std::string stunde) {
+    try {
+        
+        std::string prevStunde = std::to_string(std::stoi(stunde) - 1);
+        pqxx::work worker(connectionObject);
+        std::string query =
+           "UPDATE Veranstalter_Veranstaltung_Uhrzeit SET Veranstalter_id = (SELECT ID FROM Veranstalter "
+                "WHERE arbeitszeit <= 14 AND krank = FALSE "
+                "AND(standort = (SELECT ort FROM Veranstaltung WHERE ID = (SELECT veranstaltung_ID FROM Veranstalter_Veranstaltung_Uhrzeit WHERE uhrzeit_id = $1 AND tag = $2)) "
+                    "AND ID != (SELECT veranstalter_ID FROM Veranstalter_Veranstaltung_Uhrzeit WHERE uhrzeit_id = $1 AND tag = $2)) "
+                "ORDER BY random() LIMIT 1) "
+            "WHERE uhrzeit_id = $3 AND tag = $4;";
+        pqxx::result response = worker.exec_params(query, prevStunde, tag, stunde, tag);
+        worker.commit();
+
+    }
+    catch (const std::exception& e) {
+        std::cerr << "Error: " << e.what() << std::endl;
+    }
+}
+
+void DBPlan::upperHour(std::string tag, std::string stunde) {
+    try {
+        
+        std::string nextStunde = std::to_string(std::stoi(stunde) + 1);
+
+        pqxx::work worker(connectionObject);
+        std::string query =
+            "UPDATE Veranstalter_Veranstaltung_Uhrzeit SET Veranstalter_ID = (SELECT Veranstalter_ID FROM Veranstalter_Veranstaltung_Uhrzeit WHERE uhrzeit_id = $1 AND tag = $2)"
+            "WHERE uhrzeit_id = $3 AND tag = $2;";
+        pqxx::result response = worker.exec_params(query, stunde, tag, nextStunde);
+        worker.commit();
+
+    }
+    catch (const std::exception& e) {
+        std::cerr << "Error: " << e.what() << std::endl;
+    }
+}
+
+
+void DBPlan::updateStandort(std::string tag, std::string stunde) {
+    try {
+
+      
+        pqxx::work worker(connectionObject);
+        std::string query =
+            "UPDATE Veranstalter SET standort = (SELECT ort FROM Veranstaltung WHERE ID = (SELECT Veranstaltung_ID FROM Veranstalter_Veranstaltung_Uhrzeit WHERE uhrzeit_id = $1 AND tag = $2)) WHERE ID = (SELECT Veranstalter_ID FROM Veranstalter_Veranstaltung_Uhrzeit WHERE uhrzeit_id = $1 AND tag = $2);";
+        pqxx::result response = worker.exec_params(query, stunde, tag);
+        worker.commit();
+
+    }
+    catch (const std::exception& e) {
+        std::cerr << "Error: " << e.what() << std::endl;
+    }
+}
+
+void DBPlan::incarbeitszeit(std::string tag, std::string stunde, std::string amount) {
+    try {
+
+
+        pqxx::work worker(connectionObject);
+        
+            std::string query =
+            "UPDATE Veranstalter SET arbeitszeit = arbeitszeit + $1 WHERE ID = (SELECT Veranstalter_ID FROM Veranstalter_Veranstaltung_Uhrzeit WHERE uhrzeit_id = $2 AND tag = $3);";
+
+        pqxx::result response = worker.exec_params(query,amount, stunde, tag);
+        worker.commit();
+
+    }
+    catch (const std::exception& e) {
+        std::cerr << "Error: " << e.what() << std::endl;
+    }
+}
+
+void DBPlan::createPlan() {
+
+
+    
+    try {
+        for (int tag = 1; tag < 6; tag++) {
+            std::string tagStr = std::to_string(tag);
+            for (int stunde = 1; stunde < 6; stunde++) {
+                std::string stundeStr = std::to_string(stunde);
+                //get dauer of next class
+                
+                if (std::stoi(getDauer(tagStr, stundeStr)) == 2) {
+                    if (stunde == 1) {
+                        addFirstOfDayTwo(tagStr);
+                    }
+                    else {
+                        addTwoHour(tagStr, stundeStr);
+                    }
+                    updateStandort(tagStr, stundeStr);
+                    incarbeitszeit(tagStr, stundeStr, "2");
+                }
+                else {
+                    if (stunde == 1) {
+                        addFirstOfDayFour(tagStr);
+                        
+                    }
+                    else {
+                        addFourHour(tagStr, stundeStr);
+                    }
+                    upperHour(tagStr, stundeStr);
+                    incarbeitszeit(tagStr, stundeStr, "4");
+                    updateStandort(tagStr, stundeStr);
+                    stunde++;
+                }
+
+            }
+            
+        }
+    }
+    catch (const std::exception& e) {
+        std::cerr << "Error: " << e.what() << std::endl;
+    }
+
+}
+
+
+
+std::vector<std::string> DBPlan::getPlan() {
+    try {
+
+        std::vector<std::string> plan;
+
+        pqxx::work worker(connectionObject);
+
+        std::string query =
+            "SELECT tag, u.anfangszeit, u.endzeit, o.ort, o.name, v.name, v.ID FROM Veranstalter_Veranstaltung_Uhrzeit LEFT JOIN Veranstalter v ON Veranstalter_Veranstaltung_Uhrzeit.veranstalter_ID = v.ID "
+            "LEFT JOIN Uhrzeit u ON Veranstalter_Veranstaltung_Uhrzeit.uhrzeit_ID = u.ID "
+            "LEFT JOIN Veranstaltung o ON Veranstalter_Veranstaltung_Uhrzeit.veranstaltung_ID = o.ID "
+            "ORDER BY tag, uhrzeit_ID;";
+
+        pqxx::result response = worker.exec(query);
+        worker.commit();
+
+        for (const auto& row : response) {
+            std::string rowstring;
+            for (const auto& col : row) {
+                rowstring.append(col.c_str());
+                rowstring.append(" , ");
+            }
+            plan.push_back(rowstring);
+            
+        }
+
+        return plan;
+       
+
+    }
+    catch (const std::exception& e) {
+        std::cerr << "Error: " << e.what() << std::endl;
+    }
+}
+
+
+
--- a/DBHandler/DBPlan.hpp
+++ b/DBHandler/DBPlan.hpp
@@ -0,0 +1,50 @@
+#ifndef _DBPLAN_HPP_
+#define _DBPLAN_HPP_
+
+
+#include "DBHandler.hpp"
+#include <iostream>
+#include <vector>
+
+class DBPlan : public DBHandler {
+private:
+	//Functions needed for creation and updating of the plan
+	std::string getDauer(std::string tag, std::string stunde);
+	void addFirstOfDayTwo(std::string tag);
+	void addTwoHour(std::string tag, std::string stunde);
+	void addFirstOfDayFour(std::string tag);
+	void upperHour(std::string tag, std::string stunde);
+	void addFourHour(std::string tag, std::string stunde);
+	void sucheVertretung(std::string tag, std::string stunde);
+	void vertretung(std::string tag, std::string stunde, std::string dauer);
+	void deleteVeranstalterForeign(std::string id);
+	void deleteVeranstaltungForeign(std::string id);
+	void updateStandort(std::string tag, std::string stunde);
+	void incarbeitszeit(std::string tag, std::string stunde, std::string amount);
+public:
+	DBPlan(std::string connStr);
+
+	void meldeKrank(std::string id, std::string tag, std::string stunde);
+	void meldeGesund(std::string id);
+	void deleteVeranstaltung(std::string id);
+	void hinzufuegenVeranstaltung(std::string name, std::string dauer, std::string ort, std::string raum);
+	
+
+	void deleteVeranstalter(std::string id);
+	void hinzufuegenVeranstalter(std::string email, std::string name, std::string pw, std::string admin);
+	
+
+	void deleteStudent(std::string id);
+	void hinzufuegenStudent(std::string email, std::string name, std::string pw);
+	
+
+	void createPlan();
+
+	//Each string in form of (tag , anfangszeit , endzeit , Ort , Veranstaltung , Mitarbeiter , mitarbeiterID , )  
+	std::vector<std::string> getPlan();
+
+
+
+};
+
+#endif
--- a/2
+++ b/2
@@ -0,0 +1,2 @@
+Code written with libpqxx-version 7.4.1
+install-guide: http://en.wiki.imlint.org/Pqxx_tutorial
--- a/script.sql
+++ b/script.sql
@@ -0,0 +1,151 @@
+
+DROP VIEW studenten_veranstalter;
+DROP TABLE Veranstalter_Veranstaltung_Uhrzeit;
+DROP TABLE Studenten;
+DROP TABLE Veranstalter;
+DROP TABLE Uhrzeit;
+DROP TABLE veranstaltung;
+DROP SEQUENCE global_id_seq;
+
+
+
+
+
+CREATE SEQUENCE global_id_seq;
+
+CREATE TABLE Studenten (
+    matrikelnummer INTEGER PRIMARY KEY DEFAULT nextval('global_id_seq'),
+    name VARCHAR(30) NOT NULL,
+    email VARCHAR(30) NOT NULL,
+    passwort VARCHAR(30) NOT NULL
+);
+
+
+CREATE OR REPLACE FUNCTION random_between_two()
+RETURNS VARCHAR AS $$
+BEGIN
+    IF random() < 0.5 THEN
+        RETURN 'A';
+    ELSE
+        RETURN 'B';
+    END IF;
+END;
+$$ LANGUAGE plpgsql;
+
+
+CREATE TABLE Veranstalter (
+    ID INTEGER PRIMARY KEY DEFAULT nextval('global_id_seq'), 
+    name VARCHAR(30),
+    email VARCHAR(30),
+    passwort VARCHAR(30),
+    arbeitszeit INTEGER DEFAULT 0,
+    standort VARCHAR(30) DEFAULT random_between_two(),
+    krank BOOLEAN DEFAULT FALSE,
+    admin BOOLEAN NOT NULL DEFAULT FALSE
+);
+
+
+
+
+            
+ CREATE VIEW studenten_veranstalter AS 
+ SELECT matrikelnummer AS id, passwort, NULL AS admin FROM Studenten 
+     UNION ALL 
+ SELECT ID, passwort, admin FROM Veranstalter;
+
+
+
+ CREATE TABLE Veranstaltung ( 
+            ID SERIAL PRIMARY KEY, 
+            ort VARCHAR(30) NOT NULL, 
+            raum INTEGER NOT NULL, 
+            name VARCHAR(90) NOT NULL,
+            dauer INTEGER NOT NULL 
+            );
+
+
+
+
+   CREATE TABLE Uhrzeit ( 
+            ID SERIAL PRIMARY KEY, 
+            anfangszeit TIME NOT NULL, 
+            endzeit TIME NOT NULL );
+
+
+
+    INSERT INTO Uhrzeit (anfangszeit, endzeit) VALUES 
+            ('08:00:00', '10:00:00'), 
+            ('10:00:00', '12:00:00'), 
+            ('12:00:00', '14:00:00'), 
+            ('14:00:00', '16:00:00'), 
+            ('16:00:00', '18:00:00'); 
+
+
+    CREATE TABLE Veranstalter_Veranstaltung_Uhrzeit (
+        uhrzeit_ID INTEGER REFERENCES Uhrzeit(ID),
+        tag INTEGER NOT NULL,
+        veranstalter_ID INTEGER REFERENCES Veranstalter(ID),
+        veranstaltung_ID INTEGER REFERENCES Veranstaltung(ID),
+        PRIMARY KEY(uhrzeit_ID, tag)
+    );
+
+
+    INSERT INTO Veranstalter (name, email, passwort, admin) VALUES
+       ('tech_guru', 'admin@example.com', 'password123', TRUE),
+('code_master', 'user1@example.com', 'password1', FALSE),
+('binary_hero', 'user2@example.com', 'password2', FALSE),
+('debug_ninja', 'user3@example.com', 'password3', FALSE),
+('data_wizard', 'user4@example.com', 'password4', FALSE),
+('script_samurai', 'user5@example.com', 'password5', FALSE),
+('dev_genius', 'user6@example.com', 'password6', FALSE),
+('cyber_maven', 'user7@example.com', 'password7', FALSE),
+('net_knight', 'user8@example.com', 'password8', FALSE),
+('bit_boss', 'user9@example.com', 'password9', FALSE),
+('sys_sensei', 'user10@example.com', 'password10', FALSE),
+('crypto_champ', 'user11@example.com', 'password11', FALSE);
+
+
+    INSERT INTO Veranstaltung (ort, raum, name, dauer) VALUES 
+    ('A', '101', 'Grundlagen der Programmierung', 2),
+('B', '202', 'Algorithmen und Datenstrukturen', 4),
+('A', '103', 'Netzwerkgrundlagen', 2),
+('B', '204', 'Betriebssystemkonzepte', 4),
+('A', '105', 'Softwareentwicklung', 2),
+('B', '206', 'Intelligente Systeme', 4),
+('A', '107', 'Datenbanksysteme', 2),
+('B', '208', 'Webtechnologien', 2),
+('A', '109', 'Computergrafikgrundlagen', 2),
+('B', '210', 'Maschinelles Lernen', 2);
+
+
+INSERT INTO Veranstalter_Veranstaltung_Uhrzeit (uhrzeit_ID, tag, veranstaltung_ID) VALUES
+(1, 1, 1),
+(2, 1, 7),
+(3, 1, 8),
+(4, 1, 3),
+(5, 1, 10),
+
+(1, 2, 4),
+(2, 2, 4),
+(3, 2, 5),
+(4, 2, 6),
+(5, 2, 6),
+
+(1, 3, 7),
+(2, 3, 8),
+(3, 3, 9),
+(4, 3, 10),
+(5, 3, 1),
+
+(1, 4, 2),
+(2, 4, 2),
+(3, 4, 3),
+(4, 4, 4),
+(5, 4, 4),
+
+(1, 5, 5),
+(2, 5, 6),
+(3, 5, 6),
+(4, 5, 7),
+(5, 5, 8);
+