the method named "select()" of QSqlTableModel

[silentyears]

when i use the method as follows, i find that sometimes select() return false and the next methods can still
work! who knows why or any tips?
Thanks very much!

for()
{
    ...
    QSqlTableModel model;
    model->setEditStrategy(QSqlTableModel::OnManualSubmit);
    model.setTable("tableA");
    model.select();
    model.insertRow(0);
    ...
    model.submitAll();
}

for()
{
    ...
    QSqlTableModel model;
    model->setEditStrategy(QSqlTableModel::OnManualSubmit);
    model.setTable("tableA");
    model.select();
    model.insertRow(0);
    ...
    model.submitAll();
}

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