#include <iostream>
#include <stdlib.h>

using namespace std;

void initdb();
void insertCategory();
void menuInsert();
void select();
void cinClear();

int main()
{
	initdb();

	char choice;
	int exit = 0;
	for(;!exit;){
        choice = 0;
        cout << endl << endl << endl << "Was wollen Sie tun?:" << endl;
        cout << "(e): Daten eingeben" << endl;
        cout << "(a): Daten anzeigen" << endl;
        cout << "" << endl;
        cout << "(s): schliessen" << endl;
        cin >> choice;
        switch(choice){
            case 'e':
                insertCategory();
                break;
            case 'a':
                select();
                break;
            case 's':
                exit = 1;
                break;
        }
    }
}

void initdb(){
    EXEC SQL CONNECT TO "CSDB@lamp.wlan.hwr-berlin.de" USER gr2 IDENTIFIED BY "2Au-R2n-cQN-uuG";
        cout << "state: " << sqlca.sqlstate << endl;
	EXEC SQL COMMIT;
}

void menuInsert(){
    insertCategory();
}

void insertCategory(){
    EXEC SQL BEGIN DECLARE SECTION;
		char eingna[51];
	EXEC SQL END DECLARE SECTION;

    cout << "Eingabe Name: ";
    cin >> eingna;
    if (!cin) cinClear();

    if (eingna)
    {
        EXEC SQL INSERT INTO gr2.test(name) VALUES (:eingna);
        if (!strcmp(sqlca.sqlstate, "23505")) cout << "GIBT'S SCHON" << endl;
        cout << "state: " << sqlca.sqlstate << endl;
        EXEC SQL COMMIT;
    }
}

void select(){
    //Die Ausgabe funktioniert nur dann korrekt, wenn die ids eindeutig sind!!!
    EXEC SQL BEGIN DECLARE SECTION;
        int id;
        char name[51];
    EXEC SQL END DECLARE SECTION;

    cout << endl << "Ausgabe Tabelle: " << endl;

	EXEC SQL DECLARE xxx CURSOR FOR SELECT "ID",name FROM gr2.test ORDER BY "ID";
	EXEC SQL OPEN xxx;

    int residl;
	residl = id;

    EXEC SQL FETCH FIRST FROM xxx INTO :id, :name;
	if(!strcmp(sqlca.sqlstate, "00000")) cout << id << " " << name << endl;
	else if(!strcmp(sqlca.sqlstate, "02000")) cout << "Die Tabelle ist leer!";

	while(id != residl)
	{
		residl = id;
		EXEC SQL FETCH NEXT FROM xxx INTO :id, :name;
		if(!strcmp(sqlca.sqlstate, "00000")) cout << id << " " << name << endl;
	}
	EXEC SQL COMMIT;
}

void cinClear() {
	char Muell;
	cin.clear();
	do {
		cin.get(Muell);
	} while (Muell != '\n');
}