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This implementation of the stored procedure follows good programming practices and addresses the security flaws mentioned earlier . Keep in mind, however, that when constructing code based on user inputs and stored data/metadata, it is extremely difficult (if at all possible) to achieve complete protection against SQL injection . The stored procedure usp_pivot is created as a user-defined procedure in the InsideTSQL2008 database with the usp_ prefix . This means that it isn t as flexible as the
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previous implementation in the sense that it interacts only with tables and views from InsideTSQL2008 . Note that you can create a view in InsideTSQL2008 that queries objects from other databases, and provide this view as input to the stored procedure . The usp_pivot stored procedure s code takes several measures to try and prevent SQL injection attempts:
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The sizes of the input parameters are limited . Instead of allowing any query as input, the stored procedure accepts only a valid table or view name that exists in the database . Similarly, instead of allowing any T-SQL expression for the arguments @on_rows, @on_cols, and @agg_col, the stored procedure accepts only valid column names that exist in the input table/view . Note that you can create a view with any query that you like and serve it as input to the stored procedure . The code uses QUOTENAME where relevant to quote object and column names with square brackets . The stored procedure s code inspects the @cols variable for possible code strings injected to it through data stored in the rotation column values that are being concatenated .
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The code also performs input validation to verify that all parameters were supplied, that the table/view and column names exist, and that the aggregate function appears in the list of functions that you want to support . The usp_pivot stored procedure might seem much less flexible than sp_pivot, but remember that you can always create a view to prepare the data for usp_pivot . For example, consider the following code used earlier to return the sum of the value qty * unitprice for each employee, pivoted by order year:
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EXEC InsideTSQL2008.dbo.sp_pivot @query = N' SELECT O.orderid, empid, orderdate, qty, unitprice FROM Sales.Orders AS O JOIN Sales.OrderDetails AS OD ON OD.orderid = O.orderid', @on_rows = N'empid', @on_cols = N'YEAR(OrderDate)', @agg_func = N'SUM', @agg_col = N'qty*unitprice';
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You can achieve the same result with usp_pivot by first creating a view that prepares the data:
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USE InsideTSQL2008; IF OBJECT_ID('dbo.ViewForPivot', 'V') IS NOT NULL DROP VIEW dbo.ViewForPivot; GO CREATE VIEW dbo.ViewForPivot AS
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SELECT o.orderid AS orderid, empid AS empid, YEAR(orderdate) AS orderyear, qty * unitprice AS val FROM Sales.Orders AS O JOIN Sales.OrderDetails AS OD ON OD.orderid = O.orderid; GO
Then invoke usp_pivot, as in:
EXEC dbo.usp_pivot @object_name = N'ViewForPivot', @on_rows = N'empid', @on_cols = N'orderyear', @agg_func = N'SUM', @agg_col = N'val';
When you think about it, that s a small price to pay compared to compromising the security of your system . When you re done, run the following code for cleanup:
USE InsideTSQL2008; IF OBJECT_ID('dbo.ViewForPivot', 'U') IS NOT NULL DROP VIEW dbo.ViewForPivot; IF OBJECT_ID('dbo.usp_pivot', 'P') IS NOT NULL DROP PROC dbo.usp_pivot;
Dynamic UNPIVOT
In a similar manner, you can support dynamic unpivoting . To see how the technique works, first run the following code, which creates and populates the CustOrders table with pivoted total yearly order values per customer .
USE InsideTSQL2008; IF OBJECT_ID('dbo.CustOrders', 'U') IS NOT NULL DROP TABLE dbo.CustOrders; GO CREATE TABLE dbo.CustOrders ( custid INT NOT NULL, [2006] NUMERIC(12, 2) NULL, [2007] NUMERIC(12, 2) NULL, [2008] NUMERIC(12, 2) NULL, CONSTRAINT PK_CustOrders PRIMARY KEY(custid) ); WITH PivotInput AS ( SELECT custid, YEAR(orderdate) AS orderyear, val FROM Sales.OrderValues )
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