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The previous query requires UPDATE rights to the AdventureWorks database. If the data source account is restricted, the report will fail to execute even if the report doesn t use any of the dataset fields. The reason for this is that when a report is requested, the Report Server executes all report queries to populate the report datasets. For this reason, we recommend that you delete this dataset as soon as you are finished experimenting so that it doesn t interfere with report processing.
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Using expression-based queries A second scenario where you will need to use the Generic Query Designer is when you are working with expression-based queries. Unlike the Graphical Query Designer, the Generic Query Designer doesn t attempt to parse the query text to ensure it is syntactically correct. Instead, it allows you to type whatever you want, and once the query is constructed, it passes the query directly to the data source. For users familiar with Microsoft Access, the Access equivalent is a pass-through query. We haven t covered expressions yet (see chapter 5), but consider the case in which you want to restrict the results returned from the SalesOrderDetail table only if the OrderID is specified. To achieve this, use a Visual Basic .NET (VB .NET) expression, similar to this one:
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= "select * from Sales.SalesOrderDetail " & _ Iif(Parameters!OrderID.Value Is Nothing, "", _ " where SalesOrderID =" & Parameters!OrderID.Value)
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Expression-based queries are susceptible to SQL injection attacks. SQL injection happens when some (malicious) SQL code is appended to the legitimate SQL statement contained within the report query. For example, the SQL statement we ve just discussed is vulnerable to a SQL injection attack. A hacker could pass another SQL statement to the OrderID report parameter for example, a data modification statement to update, insert, or delete data; or a statement to alter or even drop database objects. As a result, the expression-based statement may look like this:
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= "select * from Sales.SalesOrderDetail where SalesOrderID = 1;UPDATE Sales.SalesOrderDetail (SET // perform data changes here
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There are a number of strategies for using expression-based statements safely in your reports. One is to filter out the report parameters for valid SQL characters for example, the semicolon delimiter character in our case.
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When the Generic Query Designer determines that expressions are used, it doesn t give you a choice to execute the query by clicking on the exclamation point. As a result, you won t be able to get the dataset fields. Instead, you need to add the fields manually, using either the Fields toolbox or the Fields tab in the dataset properties. Next, drag the fields to the report layout and execute the report. Finally, if the query is based on an expression, as in the above case, don t forget to prefix the text with = . We would like to fast-forward a bit and mention that the ability to use an expression to generate the SQL statement on the fly opens a whole new world of opportunities. Your report can call a piece of code defined as an expression or in an external assembly to get the query statement custom-tailored, based on certain conditions. The example that follows is simple but illustrates the expression s flexibility. Say you have a function that returns a SQL statement, like the one shown here:
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Function GetSQL (ByVal orderID as Integer) as String Return "select * from Sales.SalesOrderDetail where " _ & "SalesOrderID = " _ & orderID End Function
The GetSQL function can be defined as an embedded function in the report or located in an external assembly for example, in the application data layer. We discuss extending RS with custom code in detail in chapter 6. Once the GetSQL function is ready, you can use the Generic Query Designer to set your query text to
= Code.GetSQL(Parameters!OrderID.Value)
In this case, you are calling the GetSQL function and passing the value of the OrderID report parameter. Once you manually define the fields that the query AUTHORING DATASET QUERIES 89
returns, you can base our report on the results of this generated on-the-fly query. Talk about flexibility! Now that you know how to use the Query Designers to create basic dataset queries, let s see how to make them more flexible by using parameters.
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