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SQL CLR – May 15, 2007

SQL CLR – May 15, 2007. Tony AnzelmoSQL 2005 Microsoft.Net Common Language Runtime C#, VB.Net , C++ (Safe Compilation) UDF, UDA, UDT, USP. Agenda. Intro to Microsoft SQL 2005 CLR Supported Programming Languages When to use T-SQL vs. SQL CLR Demo: Hello World Security & Performance

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SQL CLR – May 15, 2007

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  1. SQL CLR – May 15, 2007 • Tony AnzelmoSQL 2005 • Microsoft.Net Common Language Runtime • C#, VB.Net, C++ (Safe Compilation) • UDF, UDA, UDT, USP

  2. Agenda • Intro to Microsoft SQL 2005 CLR • Supported Programming Languages • When to use T-SQL vs. SQL CLR • Demo: Hello World • Security & Performance • Demo: Regular Expressions • Resources and Question/Answers

  3. Intro to SQL 2005 CLR • SQL CLR/.Net assemblies not for everyone, and only useful for certain circumstances • CLR Integration new to SQL 2005 • Pre-2005 options were extended stored procedures, C/C++, sp_oa OLE automation extended stored procedures • Microsoft.Net V1.0 RTM released January 5, 2002

  4. Complex formula operations String manipulation Alternative ways to bridge between legacy systems Iteration as alternative to cursor Managed .Net code Supported objects: Stored Procedures Aggregates Functions (Scalar & Table) Triggers (DDL & DML) Types SQL CLR Benefits

  5. Supported Programming Languages • C# and VB.Net only supported .Net languages • “Have built-in project templates which guarantee code that is safe for execution in SQLCLR” • Host Protection Attributes • Determines what types are allowed on the host CLR environment and not. Used in conjunction with Code Access Security • C++ is allowed with safe compilation option • compile.exe /safe <source.c>

  6. .Net namespaces • SQL CLR .Net Namespaces • System.Data • System.Data.Sql • System.Data.SqlTypes • Microsoft.SqlServer.Server

  7. Demo: Hello World No need to pay for Visual Studio $$$, just notepad, csc, and osql…. but an IDE like Visual Studio would be very helpful, for things like IntelliSense and debugging tools • Write our class file • Compile into a dynamic linked library/Microsoft.Net assembly • Bring assembly into SQL • Attach assembly to T-SQL endpoints

  8. Enabling SQL CLR sp_configure ‘clr enabled’, 1 AND reconfigure

  9. Demo: Hello World C# using System; using System.Data.SqlClient; using Microsoft.SqlServer.Server; public class SQLLibrary { public static void HelloWorld() { SqlContext.Pipe.Send(String.Format("Hello world! The current time is {0}",System.DateTime.Now.ToString())); } } C:\set path=%path%;c:\windows\Microsoft.Net\Framework\v2.0.50727\ C:\csc /target:library HelloWorld.cs

  10. Demo: Hello World Deploy --deploy.sql use Playground GO if exists(select * from sys.procedures where name = 'HelloWorld') drop procedure HelloWorld GO if exists(select * from sys.assemblies where name = 'SQLAssembly') drop assembly SQLAssembly GO create assembly SQLAssembly from 'c:\drop\test.dll' GO create procedure dbo.HelloWorld as external name SQLAssembly.SQLLibrary.HelloWorld GO exec dbo.HelloWorld GO C:\osql -E -S localhost -i deploy.sql

  11. Assembly DMVs • sys.assemblies • sys.assembly_files • sys.assembly_modules • sys.assembly_references • sys.module_assembly_usages

  12. Security • SQL CLR CAS Permission Sets • SAFE: string, computation, local data access • EXTERNAL_ACCESS: adds on file, network, registry, and environment vars • UNSAFE: adds less restriction, adds ability to call unsafe code like COM (do not allow!) • Role Based Security (User must be logged in with their AD/NTLM account)

  13. Performance Comparisons • Regular Expressions T-SQL vs. CLR

  14. Demo: Regular Expressions using System; using Microsoft.SqlServer.Server; using System.Text.RegularExpressions; public class RegExCompiled { [SqlFunction(IsDeterministic = true, IsPrecise = true)] public static bool RegExCompiledMatch(string pattern, string matchString) { return Regex.Match(matchString.TrimEnd(null), pattern.TrimEnd(null), RegexOptions.Compiled).Success; } }

  15. Demo: UDF Deployment USE PLAYGROUND --Same assembly/procedure drop existing and add logic CREATE FUNCTION dbo.RegExMatch(@RegExPattern nvarchar(4000),@SearchString nvarchar(4000)) RETURNS BIT AS EXTERNAL NAME RegExBase.RegExCompiled.RegExCompiledMatch --assembly_name.class_name.method_name GO

  16. Debugging Options • Debugging SQL CLR routines can be tricky, but there are several options: • Compile time debug/release mode • Try/Catch/Finally code blocks (C#) • Code generated error messages • Debugging logging tables • Visual Studio/Other Debugging Tools

  17. SQL CLR Advanced • User defined aggregates • TransactionScope • Triggers • Method Attributes

  18. Resources and Q&A • Pro. SQL Server 2005 CLR Programming • Derek Comingore, Douglas Hinson (WROX) • $33 on Amazon.com • SQL OS: blogs.msdn.com/slavao/ • CLR: blogs.msdn.com/sqlclr/ • blogs.msdn.com/sqlprogrammability/ • RegExMatch: http://blogs.msdn.com/sqlclr/archive/2005/06/29/regex.aspx

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