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Namespace TK433.ClrLab Public Class ScalarUdf Public Shared Function DateTimeToString( _ ByVal dateTime As SqlDateTime, ByVal format As SqlString) _ As SqlString
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If dateTime.IsNull Or format.IsNull Then Return SqlString.Null End If
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Return dateTime.Value.ToString(format.Value) End Function End Class End Namespace
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Extending Microsoft SQL Server Functionality with XML, SQLCLR, and Filestream
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//C#: using System; using System.Data.SqlTypes;
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namespace TK433.ClrLab { public class ScalarUdf { static public SqlString DateTimeToString(SqlDateTime dateTime, SqlString format) { if(dateTime.IsNull || format.IsNull) return SqlString.Null;
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return dateTime.Value.ToString(format.Value); } } }
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Open a new command prompt and enter the following commands to set the path environment variable to point to the directory that contains the CLR compilers and to change the folder in which you saved your source code:
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PATH "C:\Windows\Microsoft.NET\Framework\v3.5" C: CD \TK433SQLCLR
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In the same command prompt, enter the following command to compile the assembly:
//C#: csc /target:library /out:ScalarUDF.dll ScalarUDF.cs
'VB: vbc /target:library /out:ScalarUDF.dll ScalarUDF.vb
6. 7.
If necessary, open SSMS and connect to the appropriate instance of SQL Server 2008. In a new query window, type and execute the following SQL statements to create the ScalarUDF assembly in the AdventureWorks database:
USE AdventureWorks; GO
CREATE ASSEMBLY ScalarUDF FROM 'C:\TK433SQLCLR\ScalarUDF.dll';
Lesson 2: Using SQLCLR and Filestream
In the existing query window, type, highlight, and execute the following SQL statements to create the fnDateTimeToString UDF.
CREATE FUNCTION dbo.fnDateTimeToString ( @DateTime DATETIME ,@Format NVARCHAR(50) ) RETURNS NVARCHAR(50) AS EXTERNAL NAME ScalarUDF."TK433.ClrLab.ScalarUdf".DateTimeToString;
In the same query window, type, highlight, and execute the following SELECT statement to execute the fnDateTimeToString UDF:
SELECT TOP(5) CustomerID ,dbo.fnDateTimeToString(OrderDate, N'yyyy_MM_dd') FROM Sales.SalesOrderHeader;
The result should look like this:
CustomerID ------------- ----------676 117 442 227 510 2001_07_01 2001_07_01 2001_07_01 2001_07_01 2001_07_01
e xercise 2
Create a Table-Valued UDF
In this exercise, you create a table-valued UDF that returns a numbers table. Because of the extra code involved with using Visual Basic .NET, only a C# solution is provided.
1. 2.
In the C:\TK433SQLCLR directory created in Exercise 1, create a new file called TableValuedUDF.cs. Type the following code block into the file using a text editor such as Notepad.exe, and then save and close the file:
//C# using System; using System.Collections; using System.Data.SqlTypes; using Microsoft.SqlServer.Server;
namespace TK433.ClrLab { public class TableValuedUdf
Extending Microsoft SQL Server Functionality with XML, SQLCLR, and Filestream
{ [SqlFunction(FillRowMethodName = "GetNumbersTableFillRow", TableDefinition = "Number INT")] static public IEnumerable GetNumbersTable( SqlInt32 startNumber, SqlInt32 endNumber) { for (int number = startNumber.Value; number <= endNumber.Value; ++number) { yield return number; } }
static private void GetNumbersTableFillRow( object value, out SqlInt32 number) { number = (int)value; } } }
Open a command prompt and enter the following commands to set the path environment variable to point to the directory that contains the CLR compilers and change to the folder in which you saved the source code:
PATH "C:\Windows\Microsoft.NET\Framework\v3.5" C: CD \TK433SQLCLR
In the same command window, enter the following command to compile the assembly.
csc /target:library /out:TableValuedUDF.dll TableValuedUDF.cs
5. 6.
If necessary, open SSMS and connect to the appropriate instance of SQL Server 2008. In a new query window, type and execute the following SQL statements to create the TableValuedUDF assembly in the AdventureWorks database:
USE AdventureWorks; GO
CREATE ASSEMBLY TableValuedUDF FROM 'C:\TK433SQLCLR\TableValuedUDF.dll';
In the existing query window, type, highlight, and execute the following SQL statements to create the fnGetNumbersTable UDF.
CREATE FUNCTION dbo.fnGetNumbersTable ( @StartNumber INT ,@EndNumber INT )
Lesson 2: Using SQLCLR and Filestream
RETURNS TABLE (Number INT) AS EXTERNAL NAME TableValuedUDF."TK433.ClrLab.TableValuedUdf".GetNumbersTable;
In the existing query window, type, highlight, and execute the following SELECT statement to execute the fnGetNumbersTable UDF.
SELECT * FROM dbo.fnGetNumbersTable(501, 505) AS n;
The result should look like this:
Number ----------501 502 503 504 505
Extending Microsoft SQL Server Functionality with XML, SQLCLR, and Filestream
chapter Review
To practice and reinforce the skills you learned in this chapter further, you can do any or all of the following:
n n n
Review the chapter summary. Review the list of key terms introduced in this chapter. Complete the case scenario. This scenario sets up a real-world situation involving the topics of this chapter and asks you to create solutions. Complete the suggested practices. Take a practice test.
Summary
Consider whether using XML as a transport protocol between your application (or parts of your application) and SQL Server is the right solution for your business needs. Think twice about storing data in the database as XML; only do so if storing these values in tabular form either is not possible or is very cumbersome. Consider the pros and cons of using XML schema collections to validate your XML. Remember that schema validation isn t always beneficial. Before using SQLCLR, make sure that it is allowed on the SQL Server instance that your application is using. Think twice about using SQLCLR. As with XML, only do so if it is clearly the right way to meet your business needs; for instance, if the performance is a lot better than T-SQL or perhaps because it makes the code much easier to write and maintain. Remember that there is extra work associated with deploying SQLCLR objects (installing assemblies and so forth).
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