"C:mysql.exe" --host=localhost --user=root --password=pass --execute="SELECT SCHEMA_NAME FROM INFORMATION_SCHEMA.SCHEMATA WHERE SCHEMA_NAME = 'DB_Name'"

Exec(ExpandConstant('{tmp}mysql.exe'), '--host='+eServer.text+' --user='+eUser.text+' --password='+ePass.text+' --port='+ePort.text+' --execute="SELECT SCHEMA_NAME FROM INFORMATION_SCHEMA.SCHEMATA WHERE SCHEMA_NAME = '+''''+eDBname.text+''''+'"', '', SW_HIDE, ewWaitUntilTerminated, ResultCode);

    if (ResultCode <> 0)then
        MsgBox('Error when connecting to server', mbError, MB_OK);