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external keyword


external keyword

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super48
super48
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what is external keyword when and where we use it?
please give example?
Andrew G
Andrew G
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It's used when creating a CLR function, the reserved word EXTERNAL is part of the reserved phrase "EXTERNAL NAME"

See books online example from http://msdn.microsoft.com/en-AU/library/ms186755.aspx:

DECLARE @SamplesPath nvarchar(1024);
-- You may have to modify the value of this variable if you have
-- installed the sample in a location other than the default location.
SELECT @SamplesPath = REPLACE(physical_name, 'Microsoft SQL Server\MSSQL11.MSSQLSERVER\MSSQL\DATA\master.mdf', 'Microsoft SQL Server\100\Samples\Engine\Programmability\CLR\')
FROM master.sys.database_files
WHERE name = 'master';

CREATE ASSEMBLY [SurrogateStringFunction]
FROM @SamplesPath + 'StringManipulate\CS\StringManipulate\bin\debug\SurrogateStringFunction.dll'
WITH PERMISSION_SET = EXTERNAL_ACCESS;
GO

CREATE FUNCTION [dbo].[len_s] (@str nvarchar(4000))
RETURNS bigint
AS EXTERNAL NAME [SurrogateStringFunction].[Microsoft.Samples.SqlServer.SurrogateStringFunction].[LenS];
GO


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