changed more raw pointers to smart pointers

database.cpp

@@ -7,15 +7,13 @@
 using std::vector;
 
 DataBase::DataBase() {
-    this->db = new QSqlDatabase();
+    this->db = std::make_shared<QSqlDatabase>();
     *this->db = QSqlDatabase::addDatabase("QSQLITE");
     this->db->setDatabaseName("Renndatenbank.sqlite");
     // std::cout << "Konstruktor Database" << std::endl;
 }
 DataBase::~DataBase() {
     // std::cout << "Destruktor aus Datenbank" << std::endl;
-    delete this->db;
-    // delete this;
 }
 
 vector<vector<QString>> DataBase::getData2(std::string statement, int cols) {
@@ -58,14 +56,15 @@ QStringList DataBase::getDataQStringList(std::string statement) {
 
 vector<vector<QString>> DataBase::getData(std::string statement, int cols) {
 
-    char * buffer = new char[statement.length() + 1];
-    strcpy(buffer, statement.c_str());
+    // char * buffer = new char[statement.length() + 1];
+    std::shared_ptr<char> buffer(new char[statement.length() + 1]);
+    strcpy(buffer.get(), statement.c_str());
     vector<QString> data;
     vector<vector<QString>> lines;
     bool ok = this->db->open();
     QString qstr;
     if (ok) {
-        QSqlQuery query(buffer);
+        QSqlQuery query(buffer.get());
 
         while (query.next()) {
 
@@ -78,16 +77,16 @@ vector<vector<QString>> DataBase::getData(std::string statement, int cols) {
         }
     }
     this->db->close();
-    delete[] buffer;
+    // delete[] buffer;
     return lines;
 }
 
 void DataBase::setData(std::string statement) {
-    char * buffer = new char[statement.length() + 1];
-    strcpy(buffer, statement.c_str());
+    std::shared_ptr<char> buffer(new char[statement.length() + 1]);
+    strcpy(buffer.get(), statement.c_str());
     bool ok = this->db->open();
     if (ok) {
-        QSqlQuery query(buffer);
+        QSqlQuery query(buffer.get());
     }
     this->db->close();
 }