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CHAPTER 11 DATA ACCESS LAYER SERVICES
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SqlContext.Pipe.ExecuteAndSend(cmd); } } }; In this example, you create the SqlConnection and SqlCommand much like you normally would. However, note the connection string passed to the SqlConnection constructor. Since this code is running within the SQL Server process, you simply use the "context connection=true" setting to connect to that SQL Server instance. Once the connection and command are established, the code uses the SqlPipe.ExecuteAndSend() to execute the command and return the results to the caller.
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Note By default, SQL Server 2005 installs with CLR Integration disabled. To try out these examples, you ll
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need to explicitly enable CLR Integration by executing the query sp_configure 'clr enabled', 1.
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This last code example is actually a little more complicated than it needs to be. If you don t explicitly provide a connection object in the SqlCommand constructor, it will use the context connection by default. Therefore, you could rewrite this managed stored procedure as: [SqlProcedure()] public static void GetContactFullName() { // Look Ma - no connection! using (SqlCommand cmd = new SqlCommand ("Select Title, FirstName, LastName From Person.Contact")) { SqlContext.Pipe.ExecuteAndSend(cmd); } } Either way, once this stored procedure is deployed to a SQL Server 2005, you can call it like any other stored procedure. For example, you can call it using a T-SQL query: exec GetContactSalutations Or using ADO.NET in a managed language: using (SqlConnection cnn = new SqlConnection(expressConnect)) { cnn.Open(); SqlCommand cmd = new SqlCommand("GetContactSalutations", cnn); cmd.CommandType = CommandType.StoredProcedure; SqlDataReader reader = cmd.ExecuteReader(); // Loop through the reader ... }
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CHAPTER 11 DATA ACCESS LAYER SERVICES
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Managed stored procedures are most useful when you need to retrieve a set of data, process each row (the procedural logic), and return the results. You can also use a managed stored procedure to encapsulate database update logic. In either case, remember that if there is little or no procedural logic to perform, then a T-SQL stored procedure will generally be easier to write and faster to execute. The sample stored procedure code, for example, can easily be expressed as a T-SQL stored procedure and, therefore, isn t a good example of a case where you should use a managed procedure. User-Defined Functions and Table-Valued Functions After managed stored procedures, the next logical place to apply CLR Integration is when creating managed user-defined functions (UDFs). A UDF is similar to a stored procedure in that it enables you to encapsulate data-oriented logic. However, there are a number of important differences. A UDF can only read data. Updates of any kind are not allowed. A UDF can return only a scalar value. A UDF can be invoked from nearly anywhere within a T-SQL query. The last point highlights the primary reason why you might choose a UDF over a stored procedure. A stored procedure works best as a monolithic, atomic module that encapsulates all the data interaction required for a given request. In fact, a stored procedure is somewhat analogous to a service interface, in that a stored procedure typically sits at the data layer boundary and serves as the interface between the data tier and the middle tier. On the other hand, UDFs are more analogous to components, in that they are intended to implement small, but useful, tasks that can be reused within queries as a part of a larger task. For example, the following code defines a simple managed UDF that returns a single full name from a given title, first name, middle name, and last name. [SqlFunction()] public static SqlString GetFullName(SqlString title, SqlString first, SqlString middle, SqlString last) { StringBuilder fullName = new StringBuilder(); if (!title.IsNull) { fullName.AppendFormat("{0} ", title); } fullName.AppendFormat("{0} ", first); if (!middle.IsNull) { fullName.AppendFormat("{0} ", middle); } fullName.Append(last); return fullName.ToString(); }
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