MVC pattern - update the view

Here's the scenario. The application is based on the MVC pattern.

The model reads and stores the data in a database.

Whenever I clicked on one to save, edit, or delete Viewbutton, the model updates the database without any problems.

However, I failed to make the model to update the view by using this.subscribers [i] .update () in the notifyChanges of the observer method;

To improvise, I used the logic very developed to "recreate" view whenever the database is updated. This is why the number of cases is increasing rapidly.

I need help to update the same instance of the view, without having to "recreate".

See below the complex logic of the main class that makes me worth:

Whenever the area add, change or Remove button is clicked, two things happen.

1: public newData Boolean is set to true.

2nd: a "refreshData" event is dispatched. In response to the event "refreshData", the database is updated via nodel.updateDatabase ().

After completing the update of the database, a "dataReady" event is dispatched. In response to the 'dataReady' event, with addChild (view) is executed.

This results in thousands of instances of the composite view of the child with her children.

package {}

import flash.events.EventDispatcher;
import flash.display.Sprite;
import flash.display. *;
import flash.events. *.

SerializableAttribute public class Main extends Sprite {}

private var: model;

public void Main() {}

model = new Model10Vns();

model.addEventListener ("refreshData", refreshData);
model.addEventListener ("dataReady", runStrategy);


function refreshData(event:Event):void {}
{if (Model.newData)}
model.updateDatabase (); Database update
}
}


}
private void runStrategy(event:Event):void {}
controller: controller of var = new Controller (model);
view of var = new View(model,controller);
addChild (view);
}

}
}

You cannot use super in an anonymous function.

Tags: Adobe Animate

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    You will need create an INSTEAD OF trigger to update the base table of way...

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     EMPID DT                        SALES       COMM
---------- -------------------- ---------- ----------
         1 26-SEP-2009 10:19:05        200          0
         1 29-SEP-2009 10:19:05        300          0
         1 06-OCT-2009 10:19:05        100          0
         2 01-OCT-2009 10:19:05        400          0
         2 04-OCT-2009 10:19:05        150          0

SQL> create view vw_sales as
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  3  group by empid;

View created.

SQL> select * from vw_sales;

     EMPID      SALES       COMM
---------- ---------- ----------
         1        600          0
         2        550          0

SQL> update vw_sales set comm = sales*0.1;
update vw_sales set comm = sales*0.1
       *
ERROR at line 1:
ORA-01732: data manipulation operation not legal on this view

    So, as a standard, we can update the display because it contains aggregates.

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    SQL> ed
Wrote file afiedt.buf

  1  create or replace trigger trg_vw_sales instead of update on vw_sales
  2  begin
  3    update test1
  4    set comm = :new.comm / (select count(*) from test1 where empid = :new.empid)
  5    where empid = :new.empid;
  6* end;
SQL> /

Trigger created.

    So now, we should be able to update the view...

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2 rows updated.

SQL> select * from vw_sales;

     EMPID      SALES       COMM
---------- ---------- ----------
         1        600         60
         2        550         55

    It's looks right. The commission shall be 10% of the total value of sales. :)

    And if we check the base table...

    SQL> select * from test1;

     EMPID DT                        SALES       COMM
---------- -------------------- ---------- ----------
         1 26-SEP-2009 10:19:05        200         20
         1 29-SEP-2009 10:19:05        300         20
         1 06-OCT-2009 10:19:05        100         20
         2 01-OCT-2009 10:19:05        400       27.5
         2 04-OCT-2009 10:19:05        150       27.5

SQL>

    ... the commission is evenly distributed over the sales as we wanted.

    ;)

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