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Figure 5-5. Adding a stored procedure to the project The final step in adding the new stored procedure is to name it. Figure 5-6 shows the window that will appear after clicking Stored Procedure. The Stored Procedure template is selected, and the procedure has been named GetSalesPerTerritoryByMonth. Developers should remember that, just as in naming T-SQL stored procedures, descriptive, self-documenting names go a long way towards making development especially maintenance easier.

Normally SQL Server uses a non pre-emptive threading model, whereby SQL Server controls the threads running and determines when to yield one thread process to allow other threads to run. When SQL code is executing within SQL Server, each active query will have its own thread. As a lock is placed or removed on a row, a page, or a table, or the next leaf of data is being read in to the I/O buffers, that processing thread will enter a wait state. This thread will therefore yield execution back to SQL Server to allow it to process another thread or give more processing to threads currently running. CLR assembly code within SQL Server offers a different, pre-emptive threading model, whereby the operating system schedules which thread to run. To allow these two models to coexist, the CLR will call synchronization objects within SQL Server to allow SQL Server to manage the threading of any CLR object that is being executed within the SQL Server. For example, garbage collection is a function of CLR that cleans up memory allocated during your assembly execution that hasn t been explicitly deallocated. SQL Server will know that garbage collection is occurring and therefore can yield processing to another thread.

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After the new stored procedure has been added the project, the following code will be appear in the editing window: using using using using using System; System.Data; System.Data.SqlClient; System.Data.SqlTypes; Microsoft.SqlServer.Server;

Read-only property that returns an System.Collections.IEnumerable-implementing object containing precedence-constraint objects.

public partial class StoredProcedures { [Microsoft.SqlServer.Server.SqlProcedure] public static void GetSalesPerTerritoryByMonth() { // Put your code here } }; There are a few important features to notice here. First of all, note that the Microsoft.SqlServer. Server and System.Data.SqlTypes namespaces have been automatically included in this project. Both of these namespaces have very specific purposes within a routine and will be necessary within most SQL Server CLR projects.

Read-only property that returns an System.Collections.IEnumerable-implementing object containing Properties objects.

Once garbage collection is finished and the thread terminates, the SQL Server synchronization object will be notified and processing can continue. This is similar to when SQL Server places locks on tables, rows, and so forth. Also, any other threads within the assembly that are processing will pause to allow garbage collection to run exclusively for that assembly, avoiding possible memory corruption. The main point to bear in mind is that, since the CLR uses its own threading model, it is probably wise to avoid writing assemblies that control their own threading or synchronization (and the same argument applies to memory allocation).

The MicrosoftSqlServerServer namespace is necessary, as previously mentioned, for the attributes that must decorate all routines to be hosted within SQL Server In this case, the GetSalesPerTerritoryByMonth method has been decorated with the SqlProcedure attribute This indicates that the method is a stored procedure The method has also been defined as static since this method will be called without an object instantiation, it would not be available if not defined as static The namespace is also included in order to provide access to the calling context, for data access and returning data but more on that shortly The SystemDataSqlTypes namespace is also included This namespace provides datatypes that correspond to each of the SQL Server datatypes For instance, the equivalent of SQL Server s INTEGER datatype isn t NET s SystemInt32 datatype Instead, it s SqlTypesSqlInt32.

Although these types can be cast between each other freely, not all types have direct equivalents many of the SQL Server types have slightly different implementations than what would seem to be their NET siblings For that reason, and to provide some insulation in case of future underlying structural changes, it s important to use these types instead of the native NET types when dealing with data returned from SQL Server, including both parameters to the routine and data read using a SqlDataReader or DataSet Aside from the included namespaces, note that the return type of the GetSalesPerTerritoryByMonth method is void SQL Server stored procedures can return either 32-bit integers or nothing at all In this case, the stored procedure won t have a return value.

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