Can I (should I) use my DBClientConnection as a global variable?

[Therefore]

Writing a single-threaded MongoDB tool with the C++ driver. I always pass the DBClientConnection as a reference argument to any function that requires access to MongoDB. Can I use a global variable instead so that I don't have to pass the argument?

This came up when using Qt's QKeyEvent. This is implemented with this prototype:

   void keyPressEvent(QKeyEvent * key_event);

reimplementing:

   void QWidget::keyPressEvent ( QKeyEvent * event )

From which function I want to call a MongoDB function but I do not have access to the DBClientConnection within keyPressEvent. Hence why I'm considering making DBClientConnection a global.

If I don't pass the DBClientConnection and instead create a new connection at each function call, won't that be more significantly more overhead than with a persistent connection?

[Eliot Horowitz]

No, you should be using ScopedDbConnection, which is backed by a
connection pool for use cases like that.

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