MySQL database ,Garbled

[weixj2003ld]

I create a mysql database in my application,and it is name with Chinese.

QString dataBaseDir=mysqlDir+DatabaseName;//DatabaseName(In Chinese)
if(!dir.mkdir(dataBaseDir)){....}

QString dataBaseDir=mysqlDir+DatabaseName;//DatabaseName(In Chinese)
if(!dir.mkdir(dataBaseDir)){....}

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When I connect the database,I get the following error:Unknown database '????' QMYSQL:Unable to connect.Please help me.