how to generate and print barcode in c# windows application Lesson 2: Using SQLCLR and Filestream in Visual C#.NET

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Lesson 2: Using SQLCLR and Filestream
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The System.Data.SqlClient namespace contains the SqlConnection and SqlCommand classes used in the example. These classes are used to connect to SQL Server and execute the query. Note that these classes are the same ones that you use when connecting from an application. The System.Data.SqlTypes namespace contains the SqlInt32 type used in the example. This type mimics the behavior of an INTEGER in SQL Server. You can use the Value property of the SqlInt32 type to retrieve a CLR integer. The Microsoft.SqlServer.Server namespace contains the SqlContext and SqlPipe classes (needed for the SqlContext.Pipe call) used in the example. These classes are specific to the SQLCLR implementation and are used to communicate to the SQL Server session within which you are executing.
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The code is very similar to any code that accesses SQL Server from an application. This seems pretty cumbersome for executing only this simple SELECT statement. As you can clearly see, you won t want to use SQLCLR for simple stored procedures like the one in this example.
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The next step is to compile the code to a CLR assembly. This is accomplished by executing the C# compiler (csc.exe) or the Visual Basic .NET compiler (vbc.exe). Both these compilers can typically be found in the directory C:\Windows\Microsoft.NET\Framework\v3.5. To compile the code from a command prompt, execute the following command within the directory where you store the source code. (Note that you must have your path set up so that it points to the directory containing the compiler.)
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'VB: vbc.exe /target:library /out:CLRStoredProc.dll CLRStoredProc.vb
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//C#: csc.exe /target:library /out:CLRStoredProc.dll CLRStoredProc.cs
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The /target:library switch tells the compiler that you are compiling an assembly without a starting point; that is, the assembly can t be executed directly. It is simply a type library, and therefore, it should use the .dll extension. The /out switch simply tells the compiler what it should name the created assembly. Now it is time to load the created assembly into your database. This is accomplished by using the CREATE ASSEMBLY statement. When the statement is executed, the assembly is copied physically into the database to which you are attached. Therefore, you can delete the .dll assembly file after it has been loaded because SQL Server doesn t need it. Having the assembly stored within the database is very useful when you are moving a database to another instance because all assemblies within the database are moved with the database. To see which assemblies exist within a database, you can query the sys.assemblies catalog view.
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Extending Microsoft SQL Server Functionality with XML, SQLCLR, and Filestream
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The following T-SQL code loads the assembly into the AdventureWorks database and displays its properties by querying the sys.assemblies catalog view:
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USE AdventureWorks;
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CREATE ASSEMBLY TK433ClrDemo FROM 'C:\TK433Clr\CLRStoredProc.dll';
SELECT assembly_id, name FROM sys.assemblies WHERE name = 'TK433ClrDemo';
The result should look like this:
assembly_id name ------------- -----------------------65544 TK433ClrDemo
It is finally time for the last step: creating the stored procedure so that it can be executed by users. The following T-SQL code creates a stored procedure named Sales.spCustomerGetClr that points to the CLR method named CustomerGetProcedure in the class TK433.Clr.Demo in the assembly TK433ClrDemo. After creating the stored procedure in the next example, we also query the sys.assembly_modules catalog view for information regarding this CLR stored procedure. T-SQL modules can be found in the sys.sql_modules catalog view:
CREATE PROCEDURE Sales.spCustomerGetClr @CustomerID INT AS EXTERNAL NAME TK433ClrDemo."TK433.Clr.Demo".CustomerGetProcedure; GO
SELECT assembly_id, assembly_class, assembly_method FROM sys.assembly_modules WHERE object_id = OBJECT_ID('Sales.spCustomerGetClr');
The result should look like this:
assembly_id assembly_class assembly_method ------------- ---------------- ---------------------65544 TK433.Clr.Demo CustomerGetProcedure
After the stored procedure has been created, we can execute it. Note that executing the stored procedure looks exactly like executing a T-SQL stored procedure:
EXEC Sales.spCustomerGetClr @CustomerID = 1;
Here is the result (which has been truncated for clarity):
CustomerID TerritoryID AccountNumber CustomerType. . . ------------- ------------- --------------- ------------. . . 1 1 AW00000001 S ...
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