sebse/postgrachelorcppapplication
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added "some" functionality

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Now available: insert, select, update for questions and categories. TODO: delete for both, questions and categories
This commit is contained in:
Benjamin Petsch
2017-03-19 23:24:17 +01:00
parent 2ba7cb25ee
commit 069b40dc0f
6 changed files with 748 additions and 42 deletions
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288
project/dbclient.pgc
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@@ -4,9 +4,23 @@
using namespace std;
void initdb();
void insertCategory();
void menuInsert();
void select();
void menuSelect();
void menuUpdate();
void menuDelete();
void insertCategory();
void insertQuestion();
void selectCategory();
void selectQuestion();
void updateCategory();
void updateQuestion();
void deleteCategory();
void deleteQuestion();
void cinClear();
int main()
@@ -20,15 +34,22 @@ int main()
cout << endl << endl << endl << "Was wollen Sie tun?:" << endl;
cout << "(e): Daten eingeben" << endl;
cout << "(a): Daten anzeigen" << endl;
cout << "" << endl;
cout << "(n): Daten aendern" << endl;
cout << "(l): Daten loeschen" << endl;
cout << "(s): schliessen" << endl;
cin >> choice;
switch(choice){
case 'e':
insertCategory();
menuInsert();
break;
case 'a':
select();
menuSelect();
break;
case 'n':
menuUpdate();
break;
case 'l':
menuDelete();
break;
case 's':
exit = 1;
@@ -44,7 +65,67 @@ void initdb(){
}
void menuInsert(){
insertCategory();
char choice = 0;
cout << "Welche Tabelle?:" << endl;
cout << "(k): Kategorien" << endl;
cout << "(f): Fragen" << endl;
cin >> choice;
switch(choice){
case 'k':
insertCategory();
break;
case 'f':
insertQuestion();
break;
}
}
void menuSelect(){
char choice = 0;
cout << "Welche Tabelle?:" << endl;
cout << "(k): Kategorien" << endl;
cout << "(f): Fragen" << endl;
cin >> choice;
switch(choice){
case 'k':
selectCategory();
break;
case 'f':
selectQuestion();
break;
}
}
void menuUpdate(){
char choice = 0;
cout << "In welcher Tabelle?:" << endl;
cout << "(k): Kategorien" << endl;
cout << "(f): Fragen" << endl;
cin >> choice;
switch(choice){
case 'k':
updateCategory();
break;
case 'f':
updateQuestion();
break;
}
}
void menuDelete(){
char choice = 0;
cout << "Aus welcher Tabelle?:" << endl;
cout << "(k): Kategorien" << endl;
cout << "(f): Fragen" << endl;
cin >> choice;
switch(choice){
case 'k':
deleteCategory();
break;
case 'f':
deleteQuestion();
break;
}
}
void insertCategory(){
@@ -52,12 +133,15 @@ void insertCategory(){
char eingna[51];
EXEC SQL END DECLARE SECTION;
string h = "";
cout << "Eingabe Name: ";
cin >> eingna;
if (!cin) cinClear();
getline(cin, h);
getline(cin, h);
if (eingna)
//cout << h << endl;
if (!(h.empty()||!strcmp(h.c_str(),"\n")))
{
strcpy(eingna, h.c_str());
EXEC SQL INSERT INTO gr2.test(name) VALUES (:eingna);
if (!strcmp(sqlca.sqlstate, "23505")) cout << "GIBT'S SCHON" << endl;
cout << "state: " << sqlca.sqlstate << endl;
@@ -65,14 +149,45 @@ void insertCategory(){
}
}
void select(){
void insertQuestion(){
EXEC SQL BEGIN DECLARE SECTION;
char question[181];
char ans0[181];
char ans1[181];
char ans2[181];
char ans3[181];
int category;
EXEC SQL END DECLARE SECTION;
cout << "Frage: ";
cin >> question;
cout << "Richtige Antwort: ";
cin >> ans0;
cout << "1. Falsche Antwort: ";
cin >> ans1;
cout << "2. Falsche Antwort: ";
cin >> ans2;
cout << "3. Falsche Antwort: ";
cin >> ans3;
cout << "ID der Kategorie:" << endl << "moegliche ";
selectCategory();
cin >> category;
if(category){
EXEC SQL INSERT INTO gr2.testquestions(question,answer0,answer1,answer2,answer3,category) VALUES (:question,:ans0,:ans1,:ans2,:ans3,:category);
if(!strcmp(sqlca.sqlstate, "23503")) cout << "Das ist keine gueltige Kategorie!" << endl;
cout << "state: " << sqlca.sqlstate << endl;
EXEC SQL COMMIT;
}
}
void selectCategory(){
//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;
cout << "Kategorien:" << endl;
EXEC SQL DECLARE xxx CURSOR FOR SELECT "ID",name FROM gr2.test ORDER BY "ID";
EXEC SQL OPEN xxx;
@@ -93,6 +208,157 @@ void select(){
EXEC SQL COMMIT;
}
void selectQuestion(){
//Die Ausgabe funktioniert nur dann korrekt, wenn die ids eindeutig sind!!!
EXEC SQL BEGIN DECLARE SECTION;
int id;
char question[181];
char ans0[181];
char ans1[181];
char ans2[181];
char ans3[181];
char cat[51];
EXEC SQL END DECLARE SECTION;
string hQuestion = "", hAns0 = "", hAns1 = "", hAns2 = "", hAns3 = "", hCat = "";
cout << "Fragen:" << endl << endl;
EXEC SQL DECLARE yyy CURSOR FOR SELECT q."ID",q.question,q.answer0,q.answer1,q.answer2,q.answer3,c.name FROM gr2.testquestions q JOIN gr2.test c ON q."ID" = c."ID" ORDER BY c."ID";
EXEC SQL OPEN yyy;
int residl;
residl = id;
EXEC SQL FETCH FIRST FROM yyy INTO :id,:question, :ans0, :ans1, :ans2, :ans3, :cat;
if(!strcmp(sqlca.sqlstate, "00000")){
hQuestion = question;
hAns0 = ans0;
hAns1 = ans1;
hAns2 = ans2;
hAns3 = ans3;
hCat = cat;
hQuestion.erase(hQuestion.find_last_not_of(" \n\r\t")+1);
hAns0.erase(hAns0.find_last_not_of(" \n\r\t")+1);
hAns1.erase(hAns1.find_last_not_of(" \n\r\t")+1);
hAns2.erase(hAns2.find_last_not_of(" \n\r\t")+1);
hAns3.erase(hAns3.find_last_not_of(" \n\r\t")+1);
hCat.erase(hCat.find_last_not_of(" \n\r\t")+1);
cout << "Schema:" << endl;
cout << "Frage: Kategorie" << endl << "\tRichtige Antwort" << endl << "\tFalsche Antwort 1" << endl << "\tFalsche Antwort 2" << endl << "\tFalsche Antwort 3" << endl << endl << endl;
cout << hQuestion << ": " << hCat << endl;
cout << "\t" << hAns0 << endl;
cout << "\t" << hAns1 << endl;
cout << "\t" << hAns2 << endl;
cout << "\t" << hAns3 << endl;
}
else if(!strcmp(sqlca.sqlstate, "02000")) cout << "Die Tabelle ist leer!";
while(id != residl)
{
residl = id;
EXEC SQL FETCH NEXT FROM yyy INTO :id,:question, :ans0, :ans1, :ans2, :ans3, :cat;
if(!strcmp(sqlca.sqlstate, "00000")){
hQuestion = question;
hAns0 = ans0;
hAns1 = ans1;
hAns2 = ans2;
hAns3 = ans3;
hCat = cat;
hQuestion.erase(hQuestion.find_last_not_of(" \n\r\t")+1);
hAns0.erase(hAns0.find_last_not_of(" \n\r\t")+1);
hAns1.erase(hAns1.find_last_not_of(" \n\r\t")+1);
hAns2.erase(hAns2.find_last_not_of(" \n\r\t")+1);
hAns3.erase(hAns3.find_last_not_of(" \n\r\t")+1);
hCat.erase(hCat.find_last_not_of(" \n\r\t")+1);
cout << hQuestion << ": " << hCat << endl;
cout << "\t" << hAns0 << endl;
cout << "\t" << hAns1 << endl;
cout << "\t" << hAns2 << endl;
cout << "\t" << hAns3 << endl;
}
}
EXEC SQL COMMIT;
}
void updateCategory(){
EXEC SQL BEGIN DECLARE SECTION;
int id;
char name[51];
EXEC SQL END DECLARE SECTION;
cout << "Welche Kategorie soll bearbeitet werden? (ID eingeben):" << endl;
selectCategory();
cin >> id;
cout << "Welchen neuen Namen soll die Kategorie bekommen?" << endl;
cin >> name;
if(id){
EXEC SQL UPDATE gr2.test SET name = :name WHERE "ID" = :id;
if(!strcmp(sqlca.sqlstate, "02000")) cout << "Kein derartiger Datensatz gefunden!";
EXEC SQL COMMIT;
}
}
void updateQuestion(){
EXEC SQL BEGIN DECLARE SECTION;
int id;
char question[181];
char ans0[181];
char ans1[181];
char ans2[181];
char ans3[181];
int cat;
EXEC SQL END DECLARE SECTION;
char choice = 0;
cout << "Welche Frage soll bearbeitet werden? (ID eingeben):" << endl;
cin >> id;
if(id){
cout << "Was soll an der Frage geaendert werden?" << endl << "(f): Die Fragenstellung" << endl << "(0): Die richtige Antwort" << endl << "(1)-(3): Eine der falschen Antworten" << endl << "(k): Die Kategorie" << endl;
cin >> choice;
switch(choice){
case 'f':
cout << "Neue Fragenstellung: ";
cin >> question;
EXEC SQL UPDATE gr2.testquestions SET question = :question WHERE "ID" = :id;
break;
case '0':
cout << "Neue richtige Antwort: ";
cin >> ans0;
EXEC SQL UPDATE gr2.testquestions SET answer0 = :ans0 WHERE "ID" = :id;
break;
case '1':
cout << "Neue falsche Antwort: ";
cin >> ans1;
EXEC SQL UPDATE gr2.testquestions SET answer1 = :ans1 WHERE "ID" = :id;
break;
case '2':
cout << "Neue falsche Antwort: ";
cin >> ans2;
EXEC SQL UPDATE gr2.testquestions SET answer2 = :ans2 WHERE "ID" = :id;
break;
case '3':
cout << "Neue falsche Antwort: ";
cin >> ans3;
EXEC SQL UPDATE gr2.testquestions SET answer3 = :ans3 WHERE "ID" = :id;
break;
case 'k':
cout << "Neue Kategorie (ID):" << endl;
selectCategory();
cin >> cat;
EXEC SQL UPDATE gr2.testquestions SET category = :cat WHERE "ID" = :id;
break;
}
EXEC SQL COMMIT;
}
}
void deleteCategory(){
}
void deleteQuestion(){
}
void cinClear() {
char Muell;
cin.clear();