December 2001
Intermediate to advanced
800 pages
17h 55m
English
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Extended Stored Procedures
Extended procedures are routines residing in DLLs that function similarly to regular stored procedures. They receive parameters and return results via SQL Server's Open Data Services API and are usually written in C or C++. They must reside in the master database and run within the SQL Server process space.
Although the two are similar, calls to extended procedures work a bit differently than calls to system procedures. Extended procedures aren't automatically located in the master database and they don't assume the context of the current database when executed. To execute an extended procedure from a database other than the master, you have to fully qualify the reference (e.g., EXEC master.dbo.xp_cmdshell 'dir').
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