diff --git a/src/Core/DBHandler.cpp b/src/Core/DBHandler.cpp
new file mode 100644
index 0000000..dbf9c16
--- /dev/null
+++ b/src/Core/DBHandler.cpp
@@ -0,0 +1,26 @@
+#include "DBHandler.hpp"
+
+#include <iostream>
+//"host = localhost port = 5432 dbname = postgres user = postgres password = AlbertBridge1?"
+
+
+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;
+    }
+
+};
+
+
+
+
+
+
+
diff --git a/src/Core/DBHandler.hpp b/src/Core/DBHandler.hpp
new file mode 100644
index 0000000..71f9db7
--- /dev/null
+++ b/src/Core/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
\ No newline at end of file
diff --git a/src/Core/DBLogin.cpp b/src/Core/DBLogin.cpp
new file mode 100644
index 0000000..191aa34
--- /dev/null
+++ b/src/Core/DBLogin.cpp
@@ -0,0 +1,40 @@
+#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(int id, std::string pw) {
+
+    try {
+        pqxx::work worker(connectionObject);
+
+        std::string query =
+            "SELECT admin FROM studenten_veranstalterr WHERE id = $1 AND passwort = $2";
+
+        pqxx::result response = worker.exec_params(query, id, pw);
+
+        if (response.affected_rows() > 0) {
+
+            std::cout << response[0][0] << std::endl;
+            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;
+    }
+
+}
+
diff --git a/src/Core/DBLogin.hpp b/src/Core/DBLogin.hpp
new file mode 100644
index 0000000..f29e0c0
--- /dev/null
+++ b/src/Core/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(int id, std::string pw);
+};
+
+
+
+#endif
\ No newline at end of file
diff --git a/src/Core/DBPlan.cpp b/src/Core/DBPlan.cpp
new file mode 100644
index 0000000..bd1fe11
--- /dev/null
+++ b/src/Core/DBPlan.cpp
@@ -0,0 +1,483 @@
+#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);
+        versendeEmails();
+
+    }
+    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();
+        versendeEmails();
+    }
+    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();
+        versendeEmails();
+    }
+    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;
+    }
+}
+
+void DBPlan::versendeEmails() {
+    std::cout << "Der Einsatzplan wurde geupdated" << std::endl;
+}
+
+
diff --git a/src/Core/DBPlan.hpp b/src/Core/DBPlan.hpp
new file mode 100644
index 0000000..b0f5b40
--- /dev/null
+++ b/src/Core/DBPlan.hpp
@@ -0,0 +1,49 @@
+#ifndef _DBPLAN_HPP_
+#define _DBPLAN_HPP_
+
+
+#include "DBHandler.hpp"
+#include <iostream>
+#include <vector>
+
+class DBPlan : public DBHandler {
+private:
+	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 updateStandort(std::string tag, std::string stunde);
+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();
+	void incarbeitszeit(std::string tag, std::string stunde, std::string amount);
+
+	std::vector<std::string> getPlan();
+
+
+
+};
+
+#endif
\ No newline at end of file