Use only single database

database.cpp

@@ -15,7 +15,7 @@ bool Database::init(const QLatin1String &connectionName)
     QString path = QStandardPaths::writableLocation(QStandardPaths::AppDataLocation);
     QDir dir(path);
 
-    QSqlDatabase database = QSqlDatabase::addDatabase("QSQLITE", connectionName);
+    database = QSqlDatabase::addDatabase("QSQLITE", connectionName);
 
     if(!dir.mkpath("."))
         return false;
@@ -27,7 +27,7 @@ bool Database::init(const QLatin1String &connectionName)
         {
             QSqlQuery query(database);
             query.exec("PRAGMA foreign_keys = ON");
-            int version = checkVersion();
+            int version = checkVersion(database);
             if(version == 0)
             {
                 query.exec("PRAGMA user_version = 1");
@@ -76,6 +76,14 @@ bool Database::init(const QLatin1String &connectionName)
             }
             qDebug() << error.text();
         }
+        else
+        {
+            qDebug() << "Failed to open database" << connectionName;
+        }
+    }
+    else
+    {
+        qDebug() << "Database is invalid";
     }
     return false;
 }
@@ -146,10 +154,9 @@ bool Database::checkError(QSqlQuery &query)
     }
 }
 
-int Database::checkVersion()
+int Database::checkVersion(QSqlDatabase &db)
 {
-    QSqlDatabase db = QSqlDatabase::database();
-    QSqlQuery query("PRAGMA user_version");
+    QSqlQuery query("PRAGMA user_version", db);
     if(query.next())
         return query.value(0).toInt();
     return -1;