对于mingw和Windows:从以下位置下载C(而非c ++)连接器:

For mingw and Windows: Download the C (not c++) connector from: https://dev.mysql.com/downloads/connector/c/, then copy the library: libmysql.dll, to the folder: D:\Qt\5.5\mingw492_32\bin. This should solve the problem for the not loaded driver.