ADD mysql settings

src/main.cpp

@@ -76,7 +76,12 @@ int main(int argc, char* argv[])
     }
 
 
-    SQLHelper::Open();
+    bool sqlConnected= SQLHelper::Open();
+    if (!sqlConnected)
+    {
+        //TODO: 数据库连接失败错误
+        exit(-99);
+    }
     MainWindow w;
     DialogManager::Default()->init(&w);
     UserOperationLog::Default()->init();