Thursday, July 17, 2008 8:32 PM,
Filed Under
SQL
SQLCLR
Have you been shying out of putting extra functions on your SQL Server 2005 using SQL CLR simply because you would like to avoid DLL Hell?!
Well, the good news is that you need not be so worried, since SQL Server does not link to the dll itself, but instead it embeds the assembly in the database. What's even better is that you can deploy your assembly by simply scripting it.
Lets do this with an example, in the previous post there is a sample that shows how to create support for regular expressions using SQL CLR. To deploy this on your production server without having to copy any url's you simply need to open Sql Server Management Studio and go to:
DB > Programmability > Assemblies > AssemblyName > RightClick > ScriptAssembly As > Create To > Clipboard | File | New Window
like so:
In fact this will create the following sql script for you:
CREATE ASSEMBLY [TextFunctions]
AUTHORIZATION [dbo]
FROM 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WITH PERMISSION_SET = SAFE
Without having the dll nor the requirement to link to any dll you now have part of your change script for deploying this assembly to your production server.
Of course, the server still needs to be CLR Enabled, if it is not CLR Enabled you will need to enable it before creating the assembly:
sp_configure 'clr enabled', 1
RECONFIGURE WITH OVERRIDE
Before we can test our assembly we register our new functions
CREATE Function RegExMatch(@Input NVARCHAR(512),@Pattern NVARCHAR(127))
RETURNS BIT
EXTERNAL NAME TextFunctions.RegularExpressions.RegExMatch
GO
CREATE Function RegExReplace(@Input NVARCHAR(512),@Pattern NVARCHAR(127), @Replacement NVARCHAR(512))
RETURNS NVARCHAR(512)
EXTERNAL NAME TextFunctions.RegularExpressions.RegExReplace
GO
Now we lets test our newly available functions:
Select dbo.RegExMatch('333-4444','\d{3}-\d{4}')
--returns 1
Select dbo.RegExReplace('333-4444','(\d+)-(\d+)', '$2-$1')
--reverses two numbers seperated by a dash returns 4444-333
And that's all needed. If you would like to check out the source code for creating the original dll and compiling it, have a look here