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SQL - Data projection - Part 7 - Encrypting the View
Haziran 4, 2012 by sql tutorial

Article Information



This SQL Tutorial contains and tries to cover following subjects:
- Explanation of encrypting query of view in sql.
- Example to ecrypt the query of view in sql

Articles tries to provide answer to following questions
- How to protect view in sql?
- How to hide query of view from access in sql?
- How to disable generation script from view in sql?
- How to encrypt the content of view in sql?

Article covers followings indirectly:
- alter view in sql
- sys.sql_modules

Articles pre-requisites following information:
- General knowledge of SQL Server Management Studio
- General knowledge of Views


Encrypting the query of View


View in sql are mainly used to limit access the important data as we covered in earlier articles.

In earlier articles, we covered how to restrict inserts and updates through view to underlying table. then we covered how to protect view with binding it to database schema to prevent underlying table from being modified. Those are features to protect a view in sql.

Now lets ssume that the select query of view is important. In normal case, it is possible to see what SELECT query exist in a View with sys.sql_modules system view.

Lets first create a view and try to see SELECT statement of view with sys.sql_modules.

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As above sql query indicates it, it is possible to inspect statements within view. There will be cases that the view query details of view to protect from public access. To achieve this, we will need to encrypt the view.

To encrypt the query of view, "WITH ENCRYPTION" is added to the view. Encrypting view also causes script generation from view to be blocked also. Lets alter our view to encrypt its sql query and test the sys.sql_modules again.

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As above image indicates, this time, sys.sql_modules could not retrieve query information from the view. Furthermore, if an user tries to generate CREATE script from the view to see its query, it will produce an error to prevent access to query. Error message as follows from script generation try:

TITLE: Microsoft SQL Server Management Studio

Property TextHeader is not available for View '[dbo].[V_customerOrders]'. This property may not exist for this object, or may not be retrievable due to insufficient access rights. The text is encrypted. (Microsoft.SqlServer.Smo)

ProdVer=10.50.2500.0+((KJ_PCU_Main).110617-0026+)&EvtSrc=Microsoft.SqlServer.Management.Smo.ExceptionTemplates.PropertyCannotBeRetrievedExceptionText&EvtID=TextHeader&LinkId=20476

View is encrypted.



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