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Parameters
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Parameters are big within application definition files, as they describe the values you re passing in to filter at the back-end data source, as well as the data that the back end is returning to you. We ll therefore break this up further into input parameters and output parameters.
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INPUT PARAMETERS
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For each parameter described in a SQL statement or stored procedure, we also need to define it in our definition file. These parameters may or may not also be filter descriptors more on the why not later! Let s look at our first parameter, as shown in listing 2.9.
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Listing 2.9 How to create an input parameter for an entity
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<Parameter Direction="In" Name="@ProductId"> Direction and name <TypeDescriptor TypeName="System.Int32" of parameter Name="ProductID" AssociatedFilter="ProductId" IdentifierName="[ProductID]"> <DefaultValues> <DefaultValue MethodInstanceName="dbo.[Product]Finder" Type="System.Int32">1</DefaultValue> </DefaultValues> </TypeDescriptor> </Parameter>
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While this input parameter initially seems complex, once you understand it, it ll seem easy. The first part to mention is the name of the parameter. This maps to the name given to a parameter in either our SQL statement or stored procedure.
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Understanding the application definition file
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The direction is marked as In, meaning this is a value we re going to pass in to our query or stored procedure. Within our parameter, we have a TypeDescriptor element. A TypeDescriptor is a way of defining the parameter s data type. For input parameters, they re generally only a single level deep, but we ll soon see that, for Out parameters, type descriptors can be multilevel and get quite complex. Back to looking at our particular type descriptor, we can see here we have a TypeName, which casts the values as a particular .NET framework type. If the parameter you re passing in is being used against a column that s also marked as an Identifier, you must mark it as such by adding the IdentifierName in the type descriptor. This isn t necessarily used in the finder method, but we ll see why it s important in a SpecificFinder method shortly. If this parameter is something for which a user can dynamically supply a value, this will be achieved by matching the parameter with a filter descriptor. We do this by adding an AssociatedFilter attribute to the parameter s type descriptor with the value matching a filter descriptor. Within our TypeDescriptor element for our input parameter, we have some DefaultValues elements. Our SQL statement could contain one, two, or three parameters, for example, username, age, city. The user may want to filter only by username, so to allow the statement to be executed with just this one userentered filter default values are described that can be substituted in if they re not supplied by the user. You ll see our DefaultValue element has a MethodInstance attribute. Method instances are defined at the end of a method, which we ll cover shortly. For now just remember that your DefaultValue element will need a MethodInstance element. Our DefaultValue also has to have a type, such as System.Int32. Again, this is a .NET type, the same as the TypeName of our main Parameter element. Input parameters won t be directly mapped to filter descriptors for SpecificFinder methods. This is because the parameter that s used to return a unique row by the SpecificFinder is only really ever used internally by the BDC, and not in the user interface. In fact, it only really makes sense to create filter descriptors for the Finder method. So that covers input parameters. Pretty simple, huh Now we come to output parameters quite a scary beast!
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OUTPUT PARAMETERS
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The Business Data Catalog utilizes the ADO.NET data access classes to retrieve data and return it to the SharePoint front end. The classes it utilizes are
Introducing the application definition file
DataReader and DataRecord, and these must be defined in the return parameter. Let s take a look at XML, shown in listing 2.10.
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