QSqlQuery does not execute

[weixj2003ld]

I want to insert many records into MySQL,so I do as followings:

...
QSqlQuery mQuery;
if(!mQuery.exec("LOAD DATA INFILE '"+fileName+"' INTO TABLE table1 FIELDS  TERMINATED BY ' ' LINES TERMINATED BY '\r\n'"))
{
   QMessageBox::warning(0,"",mQuery.lastError().text());
   return false;
}
...

...
QSqlQuery mQuery;
if(!mQuery.exec("LOAD DATA INFILE '"+fileName+"' INTO TABLE table1 FIELDS  TERMINATED BY ' ' LINES TERMINATED BY '\r\n'"))
{
   QMessageBox::warning(0,"",mQuery.lastError().text());
   return false;
}
...

To copy to clipboard, switch view to plain text mode 

and there is no respones,that is, table1 has no recorders and there is no error.

But when I execute " LOAD DATA INFILE '"+fileName+"' INTO TABLE table1 FIELDS TERMINATED BY ' ' LINES TERMINATED BY '\r\n'" " in cmd window,it is ok,why?