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Create stored procedures using SQLCLR. Create scalar user-defined functions (UDFs) using SQLCLR. Create table-valued UDFs using SQLCLR. Create triggers using SQLCLR. Create user-defined types using SQLCLR. Create user-defined aggregates using SQLCLR. Store BLOBs in SQL Server using a Filestream object.
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Estimated lesson time: 60 minutes
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The Basics of Using SQLCLR
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To use CLR within the database, you must perform the following steps:
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1. 2. 3. 4. 5.
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You must set the SQL Server instance to allow CLR code to run. You must write the code that the object uses with a .NET language (in this chapter, we include C# and Visual Basic .NET code examples for reference). You must compile the code to an assembly (a CLR executable). You must load the assembly into SQL Server. Finally, you must create the database object and point it to the assembly using Data Definition Language (DDL).
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We now follow each of these steps to create a very simple CLR stored procedure that should simply execute the SQL statement SELECT * FROM Sales.Customer WHERE CustomerID = CustomerID. Even though you would never use the CLR for this particular stored procedure, it is a good example because it allows you to see clearly the difference between creating
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Lesson 2: Using SQLCLR and Filestream
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a stored procedure using T-SQL to run a parameterized query and using SQLCLR to run a parameterized query. For reference, the T-SQL version of the stored procedure is shown here:
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CREATE PROCEDURE Sales.spCustomerGet @CustomerID INT AS BEGIN SELECT * FROM Sales.Customer WHERE CustomerID = @CustomerID; END
To run the same query using SQLCLR, first we allow SQLCLR code to be executed within this SQL Server instance by executing the T-SQL code shown here. Note that system types and functions that use SQLCLR (such as the spatial types geography and geometry) do not require the CLR to be enabled; it is required only for user code:
EXEC sp_configure 'clr enabled', 1; RECONFIGURE;
The first line of code changes the 'CLR enabled setting to 1 (true) and the second line of code tells SQL Server to start using any changed configuration settings. Now it is time to write the .NET code (C# or Visual Basic .NET) for the stored procedure. In this example, we create a single file containing the .NET code and then compile it using the command prompt.
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If you have Microsoft Visual Studio handy, you can use it to create the files. Use the SQL Server Project template, which can be found under the Database project type heading, to create your CLR database objects. Visual Studio can even deploy CLR database objects directly to SQL Server (meaning that Visual Studio performs for you the rest of the steps that we describe here).
We create a file called CLRStoredProc.cs (if you are using C#) or CLRStoredProc.vb (if you are using Visual Basic .NET) and add the following code to it:
'VB: Imports System Imports System.Data.SqlTypes Imports System.Data.SqlClient Imports Microsoft.SqlServer.Server
Namespace TK433.Clr Public Class Demo Public Shared Sub CustomerGetProcedure(ByVal customerId As SqlInt32) Using conn As SqlConnection = New SqlConnection("context connection=true") Dim cmd As SqlCommand = conn.CreateCommand()
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cmd.CommandText = "SELECT * FROM Sales.Customer " & vbCrLf & _ "WHERE CustomerID = @CustomerID;" cmd.Parameters.AddWithValue("@CustomerID", customerId) conn.Open()
' Execute the command and send the results to the caller. SqlContext.Pipe.ExecuteAndSend(cmd) End Using End Sub End Class End Namespace
//C#: using System; using System.Data.SqlTypes; using System.Data.SqlClient; using Microsoft.SqlServer.Server;
namespace TK433.Clr { public class Demo { static public void CustomerGetProcedure(SqlInt32 customerId) { using (SqlConnection conn = new SqlConnection("context connection=true")) { SqlCommand cmd = conn.CreateCommand(); cmd.CommandText = @"SELECT * FROM Sales.Customer WHERE CustomerID = @CustomerID"; cmd.Parameters.AddWithValue("@CustomerID", customerId); conn.Open();
// Execute the command and send the results to the caller. SqlContext.Pipe.ExecuteAndSend(cmd); } } } }
Note the following points in this example:
The connection string context connection=true tells the SqlConnection object to connect to the SQL Server instance within which you are already executing. Note that you are still in the same session as you were in outside the CLR code. This means that you are not blocked by any locks that are held by the session that executed this CLR code. The additional namespaces used are the following:
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