When i was preparing installation for our customer to use PSQL plugin i had to add to install folder among dependant QtCore.dll, QtGui.dll and QtSql.dll (and maybe what ever else you are using) folder called sqldrivers. Where your plugin should be located. But be aware of other possible dependencies of your mysql driver. E.g. PSQL plugin needs other dlls distributed with client's package of Postgres. But probably i answered different question. :-| I would say that for development it should be enough to put your plugin to plugins folder under QT install dir.
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