.NET/ASP.NET/C#/VB.NET PDF Document SDK

his book deals with F#, a language situated in the context of NET-based software construction and engineering As an expert F# programmer, you will need more than a knowledge of the F# language; you will also need to use a range of software engineering tools and methodologies wisely to let you build software that is truly valuable for the situation where it is deployed We touched on some important tools in the previous chapter In this final chapter, we look at some of the methodological issues related to F# library design In particular: We take a look at designing vanilla NET libraries according to existing NET design conventions and that minimize the use of F#-specific constructs We briefly consider some of the elements of functional programming design methodology, which offers important and deep insights into programming but doesn t address several important aspects of the library or component design problems.

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If your application security is compromised and a malicious end user is able to connect to the database using this all-in-one database account, he can potentially delete data from the tables, drop schema objects, and take all kinds of similar destructive actions Contrast this with the case where you have a design in which the end user account does not own the data or the data access layer, but just has execute privileges on the procedural API that the user indirectly executes when logged in as the application user (through the application) In this case, the user can perform none of the aforementioned destructive actions, simply because he has not been granted the privileges to do so Thus, ideally we should have a separate database schema for the end user, data access layer, and data database accounts, as shown in Figure 15-1..

cm.CommandType = CommandType.StoredProcedure; cm.Parameters.Add( "@PageName", SqlDbType.VarChar, 400).Value = Request.Url.AbsoluteUri; cm.Parameters.Add( "@SessionID", SqlDbType.VarChar, 50).Value = vsk.Value; cm.Parameters.Add( "@StateData", SqlDbType.Image).Value = ms.ToArray(); cn.Open(); cm.ExecuteNonQuery(); cn.Close(); } protected override object LoadPageStateFromPersistenceMedium() { if (Request.Params["__VIEWSTATE_KEY"] == null) return null; string viewstatekey = Request.Params["__VIEWSTATE_KEY"].ToString(); SqlConnection cn = new SqlConnection(connStr); SqlCommand cm = new SqlCommand("usp_LoadState", cn); SqlDataReader dr = null; cm.CommandType = CommandType.StoredProcedure; cm.Parameters.Add( "@PageName", SqlDbType.VarChar, 400).Value = Request.Url.AbsoluteUri; cm.Parameters.Add( "@SessionID", SqlDbType.VarChar, 50).Value = viewstatekey; try { cn.Open(); dr = cm.ExecuteReader();

We give some specific suggestions on designing NET and F# libraries, including naming conventions, how to design types and modules, and guidelines for using exceptions F# is often seen as a functional language, but, as we have emphasized in this book, it is in reality a multiparadigm language; the OO, functional, imperative, and language-manipulation paradigms are all well supported That is, F# is a function-oriented language many of the defaults are set up to encourage functional programming, but programming in the other paradigms is effective and efficient, and a combination is often best of all A multiparadigm language brings challenges for library designs and coding conventions It is a common misconception that the functional and object-oriented programming methodologies are competing; it fact, they are largely orthogonal.

Data access layer (PL/SQL)

However, it is important to note that functional programming does not directly solve many of the practical and prosaic issues associated with practical library design for solutions to these problems, we must turn elsewhere In the context of NET programming, this means turning first to the NET Library Design Guidelines, published online by Microsoft and as a book by Addison-Wesley In the official documents, the NET library design is described in terms of conventions and guidelines for the use of the following constructs in public framework libraries: Assemblies, namespaces, and types (see s 6 and 7 in this book) Classes and objects, containing properties, methods, and events (see 6) Interfaces (in other words, object interface types; see 6).

As illustrated in Figure 15-1, the data schema owns the tables and the data within these tables. The data access layer contains PL/SQL code to manipulate data. The PL/SQL packages in this schema have privileges to insert, delete, update, and select data as required on appropriate tables they need to work on. The end user accounts are given privileges only to execute the PL/SQL packages they need to execute to get their job done. In the next section, we ll look at an application example that illustrates the concepts we ve covered so far.

if (dr.Read()) { LosFormatter bf = new LosFormatter(); object data = bf.Deserialize (new MemoryStream((byte[])dr[0])); return data; } else return null; } finally { if (dr != null) dr.Close(); cn.Close(); } } }