add: added function onAuth

auth.cpp

@@ -33,4 +33,16 @@ auth::auth (QWidget *parent)
 void
 auth::onAuth ()
 {
+    QSqlDatabase *db = new QSqlDatabase(QSqlDatabase::addDatabase("QPSQL"));
+    db->setHostName(_addressEdit->text());
+    db->setPort(_portEdit->text().toInt());
+    db->setDatabaseName("cards");
+    db->setUserName(_nicknameEdit->text());
+    db->setPassword(_passwordEdit->text());
+    bool ok = db->open();
+    if (!ok) {
+        // Error to open db
+        close();
+    }
+    emit dbOpenned(db);
 }

auth.h

@@ -4,6 +4,7 @@
 #include <QLabel>
 #include <QLineEdit>
 #include <QPushButton>
+#include <QSqlDatabase>
 #include <QVBoxLayout>
 #include <QWidget>
 
@@ -28,6 +29,7 @@ private:
 public slots:
   void onAuth ();
 signals:
+    void dbOpenned(QSqlDatabase *);
 };
 
 #endif // AUTH_H