@JonB sorry for that, insert into Dataset(AT) values(?): I know nothing about SQLite. Dataset(AT) is a (syntactically valid) table to insert into, is it? Yes, it is valid statement in sqlite. Also QSqlQuery::prepare() returns a bool for success/failure, which you should be checking. Returns true if the query is prepared successfully; otherwise returns false. Plus, you check QSqlDatabase::lastError() after QSqlQuery::exec() fails, but that says yes, I got error. like QSqlError("","",""); I checked again there was a problem in database but it solved thanks alot. Now, I'm able to insert data into database from QXlsx file.