con = DriverManager.getConnection(url);
                        Statement pst=con.createStatement();
                        String date1="2000-10-12";
                        String sql = "update Mydate set 日期="+date1+"where ID='10001' ";
                        pst.executeUpdate(sql);


                  我把date1换成2000-10-12 就没问题；像这样就会出问题？请问这是什么原因？求指点！

学习了

哎  知道了  掉了个''

String sql = "update Mydate set 日期= '"+date1+" 'where ID='10001' ";