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A Row Data Gateway acts as an object that exactly mimics a single record, such as one database row In it each column in the database becomes one field The Row Data Gateway will usually do any type conversion from the data source types to the in-memory types, but this conversion is pretty simple This pattern holds the data about a row so that a client can then access the Row Data Gateway directly The gateway acts as a good interface for each row of data This approach works particularly well for Transaction Scripts (110)
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With a Row Data Gateway you're faced with the questions of where to put the find operations that generate this pattern You can use static find methods, but they preclude polymorphism should you want to substitute different finder methods for different data sources In this case it often makes sense to have separate finder objects so that each table in a relational database will have one finder class and one gateway class for the results (Figure 102)
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Figure 102 Interactions for a find with a row-based Row Data Gateway
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It's often hard to tell the difference between a Row Data Gateway and an Active Record (160) The crux of the matter is whether there's any domain logic present; if there is, you have an Active Record (160) A Row Data Gateway should contain only database access logic and no domain logic
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As with any other form of tabular encapsulation, you can use a Row Data Gateway with a view or query as well as a table Updates often turn out to be more complicated this way, as you have to update the underlying tables Also, if you have two Row Data Gateways that operate on the same underlying tables, you may find that the second Row Data Gateway you update undoes the changes on the first There's no general way to prevent this; developers just have to be aware of how virtual Row Data Gateways are formed After all, the same thing can happen with updatable views Of course, you can choose not to provide update operations
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Row Data Gateways tend to be somewhat tedious to write, but they're a very good candidate for code generation based on a Metadata Mapping (306) This way all your database access code can be automatically built for you during your automated build process
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The choice of Row Data Gateway often takes two steps: first whether to use a gateway at all and second whether to use Row Data Gateway or Table Data Gateway (144)
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I use Row Data Gateway most often when I'm using a Transaction Script (110) In this case it nicely factors out the database access code and allows it to be reused easily by different Transaction Scripts (110)
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I don't use a Row Data Gateway when I'm using a Domain Model (116) If the mapping is simple, Active Record (160) does the same job without an additional layer of code If the mapping is complex, Data
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Mapper (165) works better, as it's better at decoupling the data structure from the domain objects because the domain objects don't need to know the layout of the database Of course, you can use the Row Data Gateway to shield the domain objects from the database structure That's a good thing if you're changing the database structure when using Row Data Gateway and you don't want to change the domain logic However, doing this on a large scale leads you to three data representations: one in the business logic, one in the Row Data Gateway, and one in the database and that's one too many For that reason I usually have Row Data Gateways that mirror the database structure
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Interestingly, I've seen Row Data Gateway used very nicely with Data Mapper (165) Although this seems like extra work, it can be effective iff the Row Data Gateways are automatically generated from metadata while the Data Mappers (165) are done by hand
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If you use Transaction Script (110) with Row Data Gateway, you may notice that you have business logic that's repeated across multiple scripts; logic that would make sense in the Row Data Gateway Moving that logic will gradually turn your Row Data Gateway into an Active Record (160), which is often good as it reduces duplication in the business logic
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Example: A Person Record (Java)
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