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The other primary root object in the object model is Resource. Like Project, a Resource object can be directly created, retrieved, or updated. It also contains a list of child objects. Since I ve already walked through the creation of an editable root business object in detail, there s no need to do the same for the Resource class. However, there are two primary areas of difference that should be discussed. Where the Projects table uses a uniqueidentifier as a primary key, the Resources table uses an int identity column. This means that the database is responsible for assigning the primary key value for any new Resource objects. Additionally, just to show how it is done, I have implemented the Resource, ResourceAssignments, and ResourceAssignment objects to share a common database connection. Where every object in the Project family opens and closes its own database connection, the objects in the Resource family pass a common SqlConnection object between them when doing data access. While this complicates the code somewhat, it may offer some minor performance gains. You can choose the approach that best fits your needs.

In the software world, the easiest way to reduce overhead is to increase reuse, and the best way to get reuse out of an architecture (both design and coding) is to codify it into a framework This doesn t mean that application analysis and design are unimportant quite the opposite! People typically spend far too little time analyzing business requirements and developing good application designs to meet those business needs Part of the reason is that they often end up spending substantial amounts of time analyzing and designing the plumbing that supports the business application, and then run out of time to analyze the business issues themselves What I m proposing here is to reduce the time spent analyzing and designing the low-level plumbing by creating a framework that you can use across many business applications.

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Many databases are designed to use identity columns, where the database is responsible for assigning primary key values to rows of data as they are inserted. While the Guid approach used in Project is somewhat simpler to implement, Resource illustrates how to work with identity columns. The changes are limited to the Data Access region of the code, and in particular the DataPortal_ Insert() method. Where the updateResource stored procedure simply returns the updated timestamp for the row, addResource also returns the newly created identity value: SELECT Id, LastChanged FROM Resources WHERE Id=SCOPE_IDENTITY() This means DataPortal_Insert() needs to retrieve that value and update the object s _id field: [Transactional(TransactionalTypes.TransactionScope)] protected override void DataPortal_Insert() { using (SqlConnection cn = new SqlConnection(Database.PTrackerConnection)) { cn.Open(); using (SqlCommand cm = cn.CreateCommand()) { cm.CommandType = CommandType.StoredProcedure; cm.CommandText = "addResource"; cm.Parameters.AddWithValue("@id", _id); cm.Parameters.AddWithValue("@lastName", _lastName); cm.Parameters.AddWithValue("@firstName", _firstName); SqlParameter param = new SqlParameter("@newId",SqlDbType.Int); param.Direction = ParameterDirection.Output; cm.Parameters.Add(param);

Summary

Is the framework created in this book ideal for every application and every organization Certainly not! You ll have to take the architecture and the framework and adapt them to meet your organization s needs You may have different priorities in terms of performance, scalability, security, fault tolerance, reuse, or other key architectural criteria At the very least, though, the remainder of this book should give you a good start on the design and construction of a distributed, object-oriented architecture and framework..

param = new SqlParameter("@newLastChanged", SqlDbType.Timestamp); param.Direction = ParameterDirection.Output; cm.Parameters.Add(param); cm.ExecuteNonQuery(); _id = (int)cm.Parameters["@newId"].Value; _timestamp = (byte[])cm.Parameters["@newLastChanged"].Value; } // update child objects _assignments.Update(cn, this); } } The method opens the database connection and sets up the SqlCommand object. When the command is executed, it returns both the @newId and @newLastChanged column values, which are used to set the _id and _timestamp fields in the object. The result is that the Resource object s Id property reflects the value assigned by the database as soon as the data is added to the database. Notice that the child objects are updated after this value has been retrieved, which means that all the child ResourceAssignment objects will have access to their parent object s Id value. This is important since they use this value as a foreign key.

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