Indeed it was the driver
Thank you S.Wysota for your try, but table was just some varchar and integer, nothing dangerous.
Instead it comes out that the problem was the driver indeed, as we deducted from present brain storming: now works and I have just built again qsqlmysql4.dll following step-by-step the instructions on this site http://www.jiggerjuice.net/software/qt-sql-drivers.html and *replaced* those in qt/plugins/sqldrivers dir.
I emphatize "replaced" because if previous dll stays in plugin directory, even renamed as "ex qsqlmysql4.dll", the problems shows up again. Actually I don't know the exact motivation, anyway this reason isn't so bad...
Now anyway it works! (Apache-style)
Thank you all for your ever god-blessing help!
See you next mission
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