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Most Record Set implementations use an implicit interface This means that to get information out of the Record Set you invoke a generic method with an argument to indicate which field you want For example, to get the passenger on an airline reservation you use an expression like aReservation["passenger"] An explicit interface requires a real reservation class with defined methods and properties With an explicit reservation the expression for a passenger might be aReservationpassenger
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Implicit interfaces are flexible in that you can use a generic Record Set for any kind of data This saves you having to write a new class every time you define a new kind of Record Set In general, however, I find implicit interfaces to be a Bad Thing If I'm programming with a reservation, how do I know how to get the passenger Is the appropriate string "passenger" or "guest" or "flyer" The only way I can tell is to wander around the code base trying to find where reservations are created and used If I have an explicit interface I can look at the definition of the reservation to see what property I need
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This problem is exacerbated with statically typed languages If I want the last name of the passenger, I have to resort to some horrible expression such as ((Person)aReservation["passenger"])lastName, but then the compiler loses all type information and I have to manually enter it in to get the information I want An explicit interface can keep the type information so I can use aReservationpassengerlastName
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For these reasons, I generally frown on implicit interfaces (and their evil cousin, passing data around in dictionaries) I'm also not too keen on them with Record Sets, but the saving grace here is that the Record Set usually carries information on the legal columns in it Furthermore, the column names are defined by the SQL that creates the Record Set, so it's not too difficult to find the properties when you need them
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But it's nice to go further and have an explicit interface ADONET provides this with its strongly typed data sets, generated classes that provide an explicit and fully typed interface for a Record Set Since an ADONET data set can contain many tables and the relationships between them, strongly typed data sets also provide properties that can use that relationship information The classes are generated from the XSD data set definition
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Implicit interfaces are more common, so I've used untyped data sets in my examples for this book For production code in ADONET, however, I suggest using data sets that are typed In a non-ADONET environment, I suggest using code generation for your own explicit Record Sets
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To my mind the value of Record Set comes from having an environment that relies on it as a common way of manipulating data A lot of UI tools use Record Set, and a compelling reason to use them yourself If you have such an environment, you should use Table Module (125) to organize your domain logic: Get a Record Set
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from the database; pass it to a Table Module (125) to calculate derived information; pass it to a UI for display and editing; and pass it back to a Table Module (125) for validation Then commit the updates to the database
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In many ways the tools that make Record Set so valuable appeared because of the ever-presence of relational databases and SQL and the absence of any real alternative structure and query language Now, of course, there's XML, which has a widely standardized structure and a query language in XPath, and I think it's likely that we'll see tools that use a hierarchic structure in the same way that current tools now use Record Set Perhaps this is actually a particular case of a more generic pattern: something like Generic Data Structure But I'll leave thinking about that pattern until then
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