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Tip of the Day
Language: Enterprise
Expertise: Beginner
Sep 8, 1999

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Hide Implementation Details of Stored Procedures

You can hide the implementation details of your stored procedures from end users of the application using WITH ENCRYPTION option. ENCRYPTION indicates that SQL Server encrypts the syscomments table entry containing the text of the CREATE PROCEDURE statement. The WITH ENCRYPTION clause hides the text of a stored procedure from users. During an upgrade, SQL Server uses the encrypted comments stored in syscomments to re-create encrypted procedures.

Here is an example that creates an encrypted stored procedure:

  
/* Stored Procedure to insert a new record in 
    the Sample Table */
CREATE PROCEDURE sp_AddRecordToSampleTable 
@SampleIdNo int,
@SampleName VARCHAR(20),
@SampleDesc VARCHAR(200)
WITH ENCRYPTION
AS 
BEGIN
/* Add record into the table using the values given 
    by the user*/
INSERT INTO SampleTable(SampleIdNo, SampleName, SampleDesc) 
   VALUES(@SampleIdNo, @SampleName, @SampleDesc)
END
go 
If the user tries to use system stored procedure sp_helptext to view the text of an encrypted stored procedure directly from the syscomments table then SQL Server gives a message: "The object comments have been encrypted."
Deepak Pant
 
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