Polling SQL connection to test connectivity.

There is currently a suggestion to add this feature as the one function that should serve this purpose doesn’t currently do it.

http://bugreports.qt.nokia.com/browse/QTBUG-223

There isn’t actually a signal or any other indicator to poll the status of a connection in this case. The workaround for this is to send a query that you know will always be returned true, and if it returns false, you will know that the connection is down.

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