QSqlField::length() always return -1 when using QODBC3 driver and QSqlDatabase::record()

QSqlField::length() always return -1 when using QODBC3 driver and QSqlDatabase::record().

This happens when using QSqlDatabase::record(), but not when using QSqlQuery::record() thus a workaround is to execute a query that selects the columns from the table and then call record() on the query object.