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Appendix B
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from managed to native code when running inside SQL Server because SQL Server needs to do additional maintenance on thread-specific settings when switching context between native code and back. Consequently, XPs can significantly outperform managed code running inside SQL Server for cases where there are frequent transitions between managed and native code.
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CLR Code That Solves Common Problems
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One of the challenges that database developers face when considering whether to use CLR code or T-SQL is deciding what problems will be solved within the code. For example, a common problem faced by database developers is how to parse a string of input and use the individual elements. In .NET code, this is easy using the Split() function; however, in T-SQL, the problem requires looping string manipulation. The following code demonstrates a CLR TVF that accepts input in the form of semicolon-delimited strings and returns a single row for each delimited string in the input:
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//C# using using using using using System; System.Data; System.Data.SqlClient; System.Data.SqlTypes; Microsoft.SqlServer.Server;
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public partial class UserDefinedFunctions { [Microsoft.SqlServer.Server.SqlFunction(FillRowMethodName="FillRow",TableDefinition="value nvarchar(60)")] public static IEnumerable SplitString(SqlString str) { return str.Value.Split(';'); } public static void FillRow(object row, out string str) { str = (string)row; } } 'VB Imports Imports Imports Imports Imports
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System System.Data System.Data.SqlClient System.Data.SqlTypes Microsoft.SqlServer.Server
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Partial Public Class UserDefinedFunctions
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SQL Server 2005 Architecture and Internals
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<Microsoft.SqlServer.Server.SqlFunction(FillRowMethodName:="FillRow", _ TableDefinition:="value nvarchar(60)")> _ Public Shared Function SplitString(ByVal str As SqlString) As IEnumerable Return str.Value.Split(";"c) End Function Public Shared Sub FillRow(ByVal row As Object, _ ByRef str As String) str = CType(row, String) End Sub End Class
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Using the TVF in a T-SQL stored procedure is a very simple process. For example, if the UI of an application captured line items for an order in a semicolon-delimited string, a T-SQL stored procedure could be created to accept the full string (with delimiters) and then call the TVF to break apart the string for insert into the LineItems table, as shown in the following T-SQL code:
CREATE PROCEDURE Insert_Order @cust_id int, @lineitems nvarchar(8000) AS BEGIN INSERT LineItems SELECT * FROM dbo.SplitString(@lineitems) END
Another common problem developers face is when to use T-SQL aggregate functions versus using middle tier code to perform aggregations. T-SQL aggregates can be very efficient when the bounds of the aggregation are known at design time; however, it is sometimes appropriate to aggregate data based on a variable. For example, the following code demonstrates a CLR aggregate that can aggregate data based on the value of a column:
//C# using using using using using System; System.Data; System.Data.SqlClient; System.Data.SqlTypes; Microsoft.SqlServer.Server;
[Serializable] [Microsoft.SqlServer.Server.SqlUserDefinedAggregate(Format.Native)] public struct DomesticSales { private double m_domesticSales;
Appendix B
public void Init() { m_domesticSales = 0; } public void Accumulate(SqlString Country) { if (Country == "USA") { ++m_domesticSales; } } public void Merge(DomesticSales Group) { m_domesticSales += Group.m_domesticSales; } public double Terminate() { return m_domesticSales; }
} 'VB Imports Imports Imports Imports Imports
System System.Data System.Data.SqlClient System.Data.SqlTypes Microsoft.SqlServer.Server
<Serializable()> _ <Microsoft.SqlServer.Server.SqlUserDefinedAggregate(Format.Native)> _ Public Structure DomesticSales Private m_DomesticSales As Double Public Sub Init() m_DomesticSales = 0 End Sub Public Sub Accumulate(ByVal Country As SqlString) If Country = "USA" Then m_DomesticSales = m_DomesticSales + 1 End Sub Public Sub Merge(ByVal value As DomesticSales) value.m_DomesticSales = m_DomesticSales
SQL Server 2005 Architecture and Internals
End Sub Public Function Terminate() As Double Return m_DomesticSales End Function End Structure
Deciding When to Use CLR Code
The decision regarding whether to use a stored procedure in conjunction with the SqlPipe object or a TVF depends on several factors: usability requirements, the source of the data, the need for side effects, and the typing requirements for the results.
Usability
It might be desirable to reuse or further manipulate results produced inside a TVF or a stored procedure. Table-valued functions are more versatile from a usability perspective, as the return type of a TVF is a relational rowset that can be used in any place where such a construct is permitted. In particular, it can be used in the FROM clause of SELECT statements, and as such, the results produced can benefit from the usability of SELECT in subqueries, INSERT...SELECT statements, derived tables, table expressions, etc. However, using the T-SQL language, stored procedures can be composed only as part of the INSERT...EXEC combination that enables produced results to be stored in a permanent or temporary table. The INSERT operation represents an actual copy of the data, which will likely have a performance impact. If usability and reuse of results from within the server is a requirement, TVFs are a better alternative. If the results produced need to only be streamed back to the client or middle tier, either approach is reasonable.
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