Question about method named rowCount() of QSqlTableModel

[silentyears]

The behaviour is described in http://qt-project.org/doc/qt-4.8/qsq....html#rowCount
To see if it supports returning the size you can use the hasFeature() function (there is a link to the function in the rowcount documentation)
To get all rows you can do a sql select that returns all rows (SELECT * FROM tablename) you can replace * with a column name u need

If you don't mind me asking why do you want to get a count of all rows?

Thank you first！ sorry for reply late，I just see it。
To get all rows，I can handle every row though a loop（eg· for（int i=0；i<rowcount；i++））
Is there any better idea to traverse a table without rowcount of qsqltablemodel？thanks！