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Blog
Posts from October, 2012
Tuesday, October 30, 2012PrintSubscribe
Order Form Sample–Part 25

The calculation will analyze Order ID and current Freight value:

If the order total is greater than $100, then Freight will be $19.95 flat.
Otherwise, Freight is $3.95.

The Order Form page will allow overriding the Freight value.

In the Project Explorer, double-click on Orders / Fields / Freight (Decimal) field node.

Freight field node selected in Orders controller of the Project Explorer.

Change the Context Fields:

Property New Value
Context Fields OrderDetails,Freight

Press OK to save.

If you implemented an SQL Business Rule to calculate Subtotal and Total, continue reading the next section. If you implemented the C# / Visual Basic Business rule, skip the next section. You may also use JavaScript – skip the next two sections.

SQL Business Rule

In the Project Explorer, double-click on Orders / Business Rules / Calculate (Sql / Execute) node.

Calculate SQL Business Rule in Orders controller of Project Explorer.

Append the script:

Property New Value
Script
select @Subtotal = sum(unitprice * quantity * (1 - discount)) 
from [Order Details] 
where OrderID = @OrderID

set @Total = @Subtotal + @Freight

if (@Freight is not null or @Freight = 0 
    or @Freight = 3.95 or @Freight = 19.95)
begin
    if (@Total > 100)
        set @Freight = 19.95
    else 
        set @Freight = 3.95
end

Press OK to save.

Code Business Rule

Right-click on Orders / Business Rules / Calculate (Code / Execute) node, and select Edit Rule in Visual Studio.

Edit Rule in Visual Studio context menu option for a Calculate code business rule.

Append the following code.

C#:

using System;
using MyCompany.Data;

namespace MyCompany.Rules
{
    public partial class OrdersBusinessRules : MyCompany.Data.BusinessRules
    {

        [Rule("r101")]
        public void r101Implementation(
                    int? orderID,
                    string customerID,
                    string customerCompanyName,
                    int? employeeID,
                    string employeeLastName,
                    DateTime? orderDate,
                    DateTime? requiredDate,
                    DateTime? shippedDate,
                    int? shipVia,
                    string shipViaCompanyName,
                    decimal? freight,
                    string shipName,
                    string shipAddress,
                    string shipCity,
                    string shipRegion,
                    string shipPostalCode,
                    string shipCountry,
                    decimal? subtotal)
        {
            object total = null;
            using (SqlText calc = new SqlText(@"select sum(unitprice * 
                    quantity * (1 - discount)) from 
                    [Order Details] where OrderID= @OrderID"))
            {
                calc.AddParameter("@OrderID", orderID);
                total = calc.ExecuteScalar();
            }

            if (DBNull.Value.Equals(total))
            {
                UpdateFieldValue("Subtotal", 0);
                UpdateFieldValue("Total", 0);
            }
            else
            {
                UpdateFieldValue("Subtotal", Convert.ToDecimal(total));
                UpdateFieldValue("Total", Convert.ToDecimal(total) + freight);
            }

            if (!freight.HasValue || freight.Value == 0 ||
            freight.Value == 3.95m || freight.Value == 19.95m)
                if (Convert.ToDecimal(total) > 100)
                    UpdateFieldValue("Freight", 19.95);
                else
                    UpdateFieldValue("Freight", 3.95);
        }
    }
}

Visual Basic:

Imports MyCompany.Data
Imports System

Namespace MyCompany.Rules

    Partial Public Class OrdersBusinessRules
        Inherits MyCompany.Data.BusinessRules

        <Rule("r101")> _
        Public Sub r101Implementation( _
                    ByVal orderID As Nullable(Of Integer), _
                    ByVal customerID As String, _
                    ByVal customerCompanyName As String, _
                    ByVal employeeID As Nullable(Of Integer), _
                    ByVal employeeLastName As String, _
                    ByVal orderDate As Nullable(Of DateTime), _
                    ByVal requiredDate As Nullable(Of DateTime), _
                    ByVal shippedDate As Nullable(Of DateTime), _
                    ByVal shipVia As Nullable(Of Integer), _
                    ByVal shipViaCompanyName As String, _
                    ByVal freight As Nullable(Of Decimal), _
                    ByVal shipName As String, _
                    ByVal shipAddress As String, _
                    ByVal shipCity As String, _
                    ByVal shipRegion As String, _
                    ByVal shipPostalCode As String, _
                    ByVal shipCountry As String, _
                    ByVal subtotal As Nullable(Of Decimal))
            Dim total As Object = Nothing
            Using calc As SqlText = New SqlText(
                    "select sum(unitprice * quantity * (1 - discount)) " +
                    "from [Order Details] where OrderID=@OrderID")
                calc.AddParameter("@OrderID", orderID)
                total = calc.ExecuteScalar()
            End Using
            If DBNull.Value.Equals(total) Then
                UpdateFieldValue("Subtotal", 0)
                UpdateFieldValue("Total", 0)
            Else
                UpdateFieldValue("Subtotal", Convert.ToDecimal(total))
                UpdateFieldValue("Total", Convert.ToDecimal(total) + freight)
            End If
            If Not freight.HasValue Or freight.Value = 0 Or
                freight.Value = 3.95 Or freight.Value = 19.95 Then
                If total >= 100 Then
                    UpdateFieldValue("Freight", 19.95)
                Else
                    UpdateFieldValue("Freight", 3.95)
                End If
            End If
        End Sub
    End Class
End Namespace

Save the file.

JavaScript Business Rule

Double-click on Orders / Business Rules / Calculate (JavaScript / After) node.

Calculate JavaScript Business Rule in Orders controller of Project Explorer.

Append the following:

Property New Value
Script
[Total] = [Subtotal] + [Freight];


if ([Freight] || [Freight] == 0 || 
    [Freight] == 3.95 || [Freight] == 19.95)
{
    if ([Total] > 100)
    {
        [Freight] = 19.95;
    }
    else 
    {
        [Freight] = 3.95;
    }
}

Press OK to save.

Viewing the Results

On the toolbar, press Browse. Edit an order, and change the Freight to “0”. When you tab away from the field, the freight will be recalculated.

When Freight is cleared and Total is below $100, freight is calculated to be $3.95.

If you change the order details so that the Subtotal is greater than $100, you will see Freight be recalculated to $19.95.

When Freight is cleared and Total is above $100, freight is calculated to be $19.95.

Tuesday, October 30, 2012PrintSubscribe
Order Form Sample–Part 24

Currently, the new fields Total and Subtotal do not allow sorting or filtering. You can see this on the grid of Order Form – the Total column does not have a dropdown available, and the field is not displayed as an option in the advanced search bar.

'Total' field in Order Form is not searchable or filterable.

Let’s enable sorting and filtering for these two fields. Switch back to the Project Explorer, and double-click on Orders / Fields / Subtotal* (Currency, read-only).

Subtotal field in the Orders controller of the Project Explorer.

Change the following settings:

Property New Value
Allow Query-by-Example true
Allow Sorting true

Press OK to save the field. Now, double-click on Total field node.

Total field in the Orders controller of the Project Explorer.

Make the same changes:

Property New Value
Allow Query-by-Example true
Allow Sorting true

Save the field, and regenerate the application. On the Order Form page, you can see that the Subtotal and Total fields are now available as options on the advanced search bar.

Subtotal and Total available as options on the advanced search bar.

Both columns also have sorting and filtering options available on the column header dropdown.

Subtotal and Total column header dropdowns are now enabled.

Tuesday, October 30, 2012PrintSubscribe
Order Form Sample–Part 23

Let’s add a Total field to the Orders controller. This field will add Subtotal and Freight together to show the final cost of the whole order.

Adding the Field

In the Project Explorer, right-click on Orders / Fields node. Press New Field.

New Field context menu option for Orders data controller.

Give this new field the following settings:

Property Value
Name Total
Type Currency
The value of this field is computed at run-time by SQL Expression true
SQL Formula
(select sum(UnitPrice*Quantity*(1-Discount)) 
from "Order Details" 
where "Order Details".OrderID = Orders.OrderID) + Orders.Freight
The value of this field is calculated by a business rule expression true
Label Total
Values of this field cannot be edited True
Data Format String c
Context Fields OrderDetails, Freight

Press OK to save this field.

Binding the Field to Views

Drop Orders / Fields / Total* (Currency, read-only) field node onto Orders / Views / grid1 node.

Dropping Total field node onto 'grid1' view.     Total data field created in view 'grid1'.

Drop Total field node onto Orders / Views / editForm1 view node.

Dropping Total field node onto 'editForm1' view.     Total data field created in view 'editForm1'.

SQL Business Rule

If you used an SQL Business Rule to handle Subtotal, double-click on Orders / Business Rules / Calculate (Sql / Execute) node.

Calculate SQL Business Rule in Orders controller.

Append the following highlighted line to the Script property:

Property New Value
Script
select @Subtotal = sum(unitprice * quantity * (1 - discount)) 
from [Order Details] 
where OrderID = @OrderID

set @Total = @Subtotal + @Freight

Code Business Rule

If you are using C# or Visual Basic to handle the Subtotal field, right-click on Orders / Business Rules and press Edit Rule in Visual Studio.

Edit Rule in Visual Studio context menu option for a code business rule.

Make the following changes to the code base:

C#:

using System;
using MyCompany.Data;

namespace MyCompany.Rules
{
    public partial class OrdersBusinessRules : MyCompany.Data.BusinessRules
    {

        [Rule("r101")]
        public void r101Implementation(
                    int? orderID,
                    string customerID,
                    string customerCompanyName,
                    int? employeeID,
                    string employeeLastName,
                    DateTime? orderDate,
                    DateTime? requiredDate,
                    DateTime? shippedDate,
                    int? shipVia,
                    string shipViaCompanyName,
                    decimal? freight,
                    string shipName,
                    string shipAddress,
                    string shipCity,
                    string shipRegion,
                    string shipPostalCode,
                    string shipCountry,
                    decimal? subtotal)
        {
            using (SqlText calc = new SqlText(@"select sum(unitprice * 
                    quantity * (1 - discount)) from 
                    [Order Details] where OrderID= @OrderID"))
            {
                calc.AddParameter("@OrderID", orderID);
                object total = calc.ExecuteScalar();
                if (DBNull.Value.Equals(total))
                {
                    UpdateFieldValue("Subtotal", 0);
                    UpdateFieldValue("Total", 0);
                }
                else
                {
                    UpdateFieldValue("Subtotal", Convert.ToDecimal(total));
                    UpdateFieldValue("Total", Convert.ToDecimal(total) + freight);
                }
            }
        }
    }
}

Visual Basic:

Imports MyCompany.Data
Imports System

Namespace MyCompany.Rules

    Partial Public Class OrdersBusinessRules
        Inherits MyCompany.Data.BusinessRules

        <Rule("r101")> _
        Public Sub r101Implementation( _
                    ByVal orderID As Nullable(Of Integer), _
                    ByVal customerID As String, _
                    ByVal customerCompanyName As String, _
                    ByVal employeeID As Nullable(Of Integer), _
                    ByVal employeeLastName As String, _
                    ByVal orderDate As Nullable(Of DateTime), _
                    ByVal requiredDate As Nullable(Of DateTime), _
                    ByVal shippedDate As Nullable(Of DateTime), _
                    ByVal shipVia As Nullable(Of Integer), _
                    ByVal shipViaCompanyName As String, _
                    ByVal freight As Nullable(Of Decimal), _
                    ByVal shipName As String, _
                    ByVal shipAddress As String, _
                    ByVal shipCity As String, _
                    ByVal shipRegion As String, _
                    ByVal shipPostalCode As String, _
                    ByVal shipCountry As String, _
                    ByVal subtotal As Nullable(Of Decimal))
            Using calc As SqlText = New SqlText(
                    "select sum(unitprice * quantity * (1 - discount)) " +
                    "from [Order Details] where OrderID=@OrderID")
                calc.AddParameter("@OrderID", orderID)
                Dim total As Object = calc.ExecuteScalar()
                If DBNull.Value.Equals(total) Then
                    UpdateFieldValue("Subtotal", 0)
                    UpdateFieldValue("Total", 0)
                Else
                    UpdateFieldValue("Subtotal", Convert.ToDecimal(total))
                    UpdateFieldValue("Total", Convert.ToDecimal(total) + freight)
                End If
            End Using
        End Sub
    End Class
End Namespace

JavaScript Business Rule

You can also implement a JavaScript business rule that will use the returned value of Subtotal and sum it with Freight to calculate the value of Total.

Right-click on Orders / Business Rules, and press New Business Rule.

New Business Rule context menu option for Orders controller.

Assign the following values:

Property Value
Type JavaScript
Command Name Calculate
Phase After
Script
[Total] = [Subtotal] + [Freight];

Viewing the Results

On the toolbar, press Browse to regenerate the application. Navigate to the Order Form page, and select any order. You will see a Total field that sums up Subtotal and Freight.

Total field present in the Orders edit form.

When any of the order detail records are changed, the Subtotal and Total will be updated.

Total field updated when order details change.