s OBJECT-ORIENTED APPLICATION DESIGN in Visual Basic .NET

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CHAPTER 6 s OBJECT-ORIENTED APPLICATION DESIGN
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Though this procedure updates multiple tables, it does not include transactional code. Although you could manage the transaction at this level, you can gain flexibility by allowing the business object to manage the transaction. Using the CSLA .NET framework, you have the option to run the data access code within a System.Transactions transactional context, to run it within an Enterprise Services distributed transaction, or to manually manage the transaction. When using either System.Transactions or Enterprise Services, transactional statements in the stored procedures will cause exceptions to occur. If you opt to handle the transactions manually, you can choose to put the transactional statements here in the stored procedure, or use an ADO.NET Transaction object within the business object s data access code.
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addAssignment
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When adding or editing a project or a resource, the user may also add or change the associated data in the Assignments table. The addAssignment procedure adds a new record as follows: CREATE PROCEDURE addAssignment ( @projectID uniqueidentifier, @resourceID varchar(10), @assigned datetime, @role int, @newLastChanged timestamp output ) AS INSERT INTO Assignments (ProjectId,ResourceId,Assigned,Role) VALUES (@projectId,@resourceId,@assigned,@role) SELECT @newLastChanged = LastChanged FROM Assignments WHERE ProjectId=@projectId AND ResourceId=@resourceId RETURN This procedure may be called during the adding or editing of either a Project or a Resource object in the application. Like addProject, this procedure ends with a SELECT statement that returns the new value of the LastChanged column for the row as an output parameter. This value must be maintained by the business object to allow for future updates of the row using the updateAssignment stored procedure.
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Likewise, there s a requirement to update records in the Assignments table: CREATE PROCEDURE updateAssignment ( @projectId uniqueidentifier, @resourceId int, @assigned datetime, @role int, @lastChanged timestamp, @newLastChanged timestamp output )
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CHAPTER 6 s OBJECT-ORIENTED APPLICATION DESIGN
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AS UPDATE Assignments SET Assigned=@assigned, Role=@role WHERE ProjectId=@projectId AND ResourceId=@resourceId AND LastChanged=@lastChanged IF @@ROWCOUNT = 0 RAISERROR('Row has been edited by another user', 16, 1) SELECT @newLastChanged = LastChanged FROM Assignments WHERE ProjectId=@projectId AND ResourceId=@resourceId RETURN As with addAssignment, this may be called when updating data from either a Project or a Resource object. Notice the @lastChanged parameter. It is used in the same way the parameter was used in updateProject: to implement first-write-wins optimistic concurrency. If the UPDATE statement succeeds, the new value of the LastChanged column is returned as a result through an output parameter so that the business object can maintain the new value.
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As part of the process of updating a project or resource, it is possible that a specific record will be deleted from the Assignments table. An assignment is a child entity beneath a project or resource; and a user can remove a resource from a project, or a project from a resource. In either case, that specific assignment record must be removed from the database: CREATE PROCEDURE deleteAssignment ( @projectId uniqueidentifier, @resourceId int ) AS DELETE Ass ignments WHERE ProjectId=@projectId AND ResourceId=@resourceId RETURN This completes the operations that can be performed on the Assignments data. Notice that there s no getAssignments procedure. This is because assignments are always children of a project and a resource. The business objects never retrieve just a list of assignments, except as part of retrieving a project or resource. The getProject procedure, for instance, also retrieves a list of assignments associated with the project.
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getResources
The ResourceList object needs to be able to retrieve a list of basic information about all the records in the Resources table, as follows: CREATE PROCEDURE getResources AS SELECT Id,LastName,FirstName FROM Resources RETURN This information will be used to populate the read-only ResourceList business object.
CHAPTER 6 s OBJECT-ORIENTED APPLICATION DESIGN
existsResource
The existsResource procedure is used to determine if a resource s data is in the database: CREATE PROCEDURE dbo.existsResource ( @id int ) AS SELECT COUNT(*) FROM Resources WHERE Id=@id RETURN Like existsProject, the procedure just returns the number of resource rows with a matching Id value.
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