请问,我这句有错吗
a:=treeview1.Selected.Text;
adoquery1.Close;
adoquery1.SQL.Clear;
adoquery1.SQL.Add('select * from lqsj where lqzy = ');
adoquery1.SQL.Add(a);
//showmessage(adoquery1.sql.text);
//adodataset1.CommandText:=sql;
//showmessage(adodataset1.CommandText);
//adodataset1.open;
adoquery1.Open;
提示出错,说什么缺少默认值什么的????