Review and next steps
When we have completed this step, all of our SQL statements will be inside Gateway
classes, and no longer in our page scripts or other non-Gateway classes. We will also have tests for our Gateway
classes.
From here on out, any time we need to add new calls to the database, we will do so only in the Gateway
classes. Any time we need to fetch or save data, we will use the Gateway
methods instead of writing embedded SQL. This gives us a clear separation of concerns between the database interactions and our future model layer and entity objects.
Now that we have separated our database interactions into their own layer, we are going to inspect all the calls to the Gateway
objects throughout the legacy application. We will examine ...
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