Stored Procedure s and Functions for Quer ying in C#

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Stored Procedure s and Functions for Quer ying
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A stored procedure returning an entity type
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The replacement of the autogenerated type brings up the con rmation dialog shown in Figure 103 Click the Yes button, and save the dbml le to method regenerate the code, including the
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Stored procedure returning an entity type
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The be used as follows:
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method returns
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10: Using Stored Procedure s and Database Functions
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The result of executing this code is the execution of the corresponding stored procedure and the materialization of a set of Order entities for the The returned entities can be modi ed just like enticustomer with ID ties retrieved using dynamic SQL The following listing shows the generated SQL for stored procedure execution and the rst order in the results:
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So far we have looked at stored procedures that return single results However, stored procedures can also return multiple results Currently, the graphical designer doesn t support mapping of such stored procedures However, you can use the command-line tool SqlMetalexe or map them manually, as shown next You will go through three steps to learn how to use a stored procedure that returns multiple results First you will create a stored procedure, and then you will map it to a method Finally, you will execute the method to obtain multiple results The sample Northwind database does not have a suitable stored procedure returning multiple entities So rst, add a suitable stored procedure to the sample Northwind database The following stored procedure returns suppliers and customers from a given city as two distinct results As before, right-click the Northwind database in Server Explorer, select New Query, and run the following SQL:
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Stored Procedure s and Functions for Quer ying
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Next, add a partial class for the generated class Right-click the designer surface and select View Code The designer creates a separate le for you to write code, with a stub declaration for the corresponding partial class Add the following code for mapping the newly created stored procedure The mapping speci es the stored procedure name and the result types The method parameter indicates the corresponding stored procedure parameter The method body is similar to the one generated by the designer for executing any stored procedure based on the mapexposes multiple results ping attributes The return type that you will use next
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Now the method is available for getting suppliers and customers Add the following code to Programcs to use the multiple results returned by the stored procedure:
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10: Using Stored Procedure s and Database Functions
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Executing this code brings back suppliers and customers from London as two separate results Here, only the rst customer is shown; the others are elided:
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Using Table-Valued Functions Stored procedures return results but do not allow further query composition on the server You cannot use a stored procedure in place of a table to write a SQL query You can use LINQ to Objects to further query the results of a stored procedure However, such a query is executed entirely on the mid-tier or client machine and cannot bene t from the indexes in the database or the capabilities of the SQL query optimizer A table-valued function (TVF) can be used in place of a table in an SQL query LINQ to SQL lets you exploit this capability by allowing a method mapped to a TVF in a LINQ query in a composable fashion Such a query expression is translated to SQL, and it is executed entirely by the database server Let s add the following TVF to the copy of the sample Northwind database You can use the same steps described earlier to run the following SQL
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Stored Procedure s and Functions for Quer ying
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for a TVF in Visual Studio using the Server Explorer The TVF returns the orders shipped by a particular shipper identi ed by the TVF parameter
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The LINQ to SQL designer lets you map a TVF just like a stored procedure Expand the Functions node in Server Explorer to view the newly created TVF Drag it to the designer surface In the property grid, change the return type from autogenerated to Order Next, save the dbml le to generate the corresponding method In Northwinddesignercs, a new method appears as follows:
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Unlike the case of a stored procedure, the resulting method is marked as property of the mapping composable using the attribute This tells the LINQ to SQL runtime that the method may be used in place of a table The following code in Programcs does just that:
The rst statement shows how the mapped method can be used with the appropriate parameter in place of the table , lets us see the execution The second statement, semantics As in the case of LINQ to SQL queries shown in previous chapters, and unlike the stored procedure executions shown in this chapter so