Binding a Windows DataGrid to Master-Detail Data

[ Team LiB ]


Recipe 7.12 Binding a Windows DataGrid to Master-Detail Data
Problem
You need to bind both a parent table and child table within a DataSet to a DataGrid so
that the child data is displayed when the parent is expanded, and update the database with
edits made to data in both tables.
Solution
Use the approach demonstrated in the sample code.
The sample uses eight stored procedures, which are shown in Example 7-20
through
Example 7-27
:
GetOrders
Used to retrieve a single record from the Orders table if the optional @OrderId
parameter is specified or all Orders records if it is not
DeleteOrders
Used to delete the record specified by the @OrderId parameter from the Orders
table
InsertOrders
Used to insert a record into the Orders table and return the OrderID identity value
for the new record
UpdateOrders
Used to update all field values for the record in the Orders table specified by the
@OrderId input parameter
GetOrderDetails
Used to retrieve a single record from the Order Details table if the optional
@OrderId and @ProductID parameters are specified, or all Order Details records
if it is not
DeleteOrderDetails

Used to delete the record specified by the @OrderId and @ProductID parameters
from the Order Details table
InsertOrderDetails
Used to insert a record into the Order Details table
UpdateOrderDetails
Used to update all field values for the record in the Order Details table specified
by the @OrderId and @ProductID input parameters
Example 7-20. Stored procedure: GetOrders
CREATE PROCEDURE GetOrders
@OrderID int=null
AS
SET NOCOUNT ON

if @OrderID is not null
begin
select
OrderID,
CustomerID,
EmployeeID,
OrderDate,
RequiredDate,
ShippedDate,
ShipVia,
Freight,
ShipName,
ShipAddress,
ShipCity,
ShipRegion,
ShipPostalCode,
ShipCountry

from
Orders
where
OrderID=@OrderID

return 0
end

select
OrderID,
CustomerID,
EmployeeID,
OrderDate,
RequiredDate,
ShippedDate,
ShipVia,
Freight,
ShipName,
ShipAddress,
ShipCity,
ShipRegion,
ShipPostalCode,
ShipCountry
from
Orders

return 0
Example 7-21. Stored procedure: DeleteOrders
CREATE PROCEDURE DeleteOrders
@OrderID int

AS
SET NOCOUNT ON

delete
from
Orders
where
OrderID=@OrderID

return 0
Example 7-22. Stored procedure: InsertOrders
CREATE PROCEDURE InsertOrders
@OrderID int output,
@CustomerID nchar(5),
@EmployeeID int,
@OrderDate datetime,
@RequiredDate datetime,
@ShippedDate datetime,
@ShipVia int,
@Freight money,
@ShipName nvarchar(40),
@ShipAddress nvarchar(60),
@ShipCity nvarchar(15),
@ShipRegion nvarchar(15),
@ShipPostalCode nvarchar(10),
@ShipCountry nvarchar(15)
AS
SET NOCOUNT ON

insert Orders(

CustomerID,
EmployeeID,
OrderDate,
RequiredDate,
ShippedDate,
ShipVia,
Freight,
ShipName,
ShipAddress,
ShipCity,
ShipRegion,
ShipPostalCode,
ShipCountry)
values (
@CustomerID,
@EmployeeID,
@OrderDate,
@RequiredDate,
@ShippedDate,
@ShipVia,
@Freight,
@ShipName,
@ShipAddress,
@ShipCity,
@ShipRegion,
@ShipPostalCode,
@ShipCountry)

if @@rowcount=0
return 1

set @OrderID=Scope_Identity( )

select @OrderId OrderId

return 0
Example 7-23. Stored procedure: UpdateOrders
CREATE PROCEDURE UpdateOrders
@OrderID int,
@CustomerID nchar(5),
@EmployeeID int,
@OrderDate datetime,
@RequiredDate datetime,
@ShippedDate datetime,
@ShipVia int,
@Freight money,
@ShipName nvarchar(40),
@ShipAddress nvarchar(60),
@ShipCity nvarchar(15),
@ShipRegion nvarchar(15),
@ShipPostalCode nvarchar(10),
@ShipCountry nvarchar(15)
AS
SET NOCOUNT ON

update
Orders
set
CustomerID=@CustomerID,
EmployeeID=@EmployeeID,

OrderDate=@OrderDate,
RequiredDate=@RequiredDate,
ShippedDate=@ShippedDate,
ShipVia=@ShipVia,
Freight=@Freight,
ShipName=@ShipName,
ShipAddress=@ShipAddress,
ShipCity=@ShipCity,
ShipRegion=@ShipRegion,
ShipPostalCode=@ShipPostalCode,
ShipCountry=@ShipCountry
where
OrderID=@OrderID

if @@rowcount=0
return 1

return 0
Example 7-24. Stored procedure: GetOrderDetails
CREATE PROCEDURE GetOrderDetails
@OrderID int=null,
@ProductID int=null
AS
SET NOCOUNT ON

if @OrderID is not null and @ProductID is not null
begin
select
OrderID,
ProductID,

UnitPrice,
Quantity,
Discount
from
[Order Details]
where
OrderID=@OrderID and
ProductID=@ProductID

return 0
end

select
OrderID,
ProductID,
UnitPrice,
Quantity,
Discount
from
[Order Details]