Question

QT下使用SqlQueryModel转化SQL语句select * from car where substr(car_number,1,1) ='粤'（setFilter）

model->setFilter(QString("substr(number,1,1)=%1").arg(pro1));这样写对不对

Answer 1

printPreviewDialog1.PrintPreviewControl.StartPage = 0;
class Composite : Component
{
private List children = new List();
public Composite(string name) : base(name) { }
public override void Add(Component c)
{
children.Add(c);
}
public override void Remove(Component c)
{
children.Remove(c);
}