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3 Persistence layer zoomed to show To better understand these concerns internal layered design and how they re managed, it helps to separate the persistence layer into three basic parts: the abstraction layer, the persistence framework, and the driver or interface, as shown in the lower part of figure 13 Let s take a closer look at each of these three parts The abstraction layer The role of the abstraction layer is to provide a consistent and meaningful interface to the persistence layer It is a set of classes and methods that act as a fa ade to the persistence implementation details Methods in the abstraction layer should never require any implementation-specific parameters, nor should it return any values or throw any exceptions that are exclusive to the persistence implementation.

The built-in functions len, min, and max can be quite useful. The function len returns the number of elements a sequence contains. min and max return the smallest and largest element of the sequence, respectively. (You learn more about comparing objects in 5, in the section Comparison Operators. ) >>> >>> 3 >>> 678 >>> 34 >>> 3 >>> 2 numbers = [100, 34, 678] len(numbers) max(numbers) min(numbers) max(2, 3) min(9, 3, 2, 5)

If all goes according to plan, you should see a direct mapping from the DSL model and the structure of the data model reflected in the database..

With a proper abstraction layer in place, the entire persistence approach including both the persistence API and the storage infrastructure should be able to change without modifications to the abstraction layer or any of.

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How this works should be clear from the previous explanation, except possibly the last two expressions. In those, max and min are not called with a sequence argument; the numbers are supplied directly as arguments.

Parameter tag attributes (continued) This value is used to append to the tag s resulting body content. The append value will not be appended if the tag s resulting body content is empty. This attribute value defines whether the first nested content-producing tag will have its prepend value removed.

close (optional) removeFirstPrepend (optional)

In the previous examples, I ve used lists quite a bit. You ve seen how useful they are, but this section deals with what makes them different from tuples and strings: lists are mutable that is, you can change their contents and they have many useful specialized methods.

Think of the word schema as meaning a complete description of a database in a formal language supported by the database management system. A schema will include a formal description of all tables included in the database, their relationships and constraints, and other information needed for creating or reconstructing the database. A schema should be a complete description of the structure of the database, but will say nothing about the actual data contained in it. I introduce the term here because, in the context of SQL Server Modeling, it can often be used more or less synonymously with the word model. Schema is more appropriately used in the database context, whereas model is used in the modeling context. But the two terms are closely linked in the context of the SQL Server Modeling framework.

Table 8.7 Parameter tags Determines whether a parameter object is present Determines whether the parameter does not exist

<select id="getProducts" resultClass="Product"> SELECT * FROM Products <isParameterPresent prepend="WHERE "> <isNotEmpty property="productType"> productType=#productType# </isNotEmpty> </ isParameterPresent > </select>

Because strings can t be modified in the same way as lists, sometimes it can be useful to create a list from a string. You can do this with the list function:1 >>> list('Hello') ['H', 'e', 'l', 'l', 'o'] Note that list works with all kinds of sequences, not just strings.

In this example, we create a simple select statement again, and this time we optionally create the WHERE for filtering the results based on the productType parameter.

Getting back to the exercise, before you go any further, you should save your code. Save the DSL Grammar code by clicking in the center pane so that it has focus, then click the File Save As menu option. Click the Create New Folder icon in the Save As dialog box and rename New Folder to LunchCounter, as shown in Figure 3-30. Save the code in the untitled1* DSL Grammar Mode pane as LunchCounter.mg in the new LunchCounter folder. (The mg file extension is short for Mgrammar, another term for DSL Grammar.) Click in the left pane, then follow a similar procedure (except for creating the new folder), and save the DSL sandwich code as SandwichLanguage.dsl in the LunchCounter folder.

Tip To convert a list of characters such as the preceding code back to a string, you would use the following expression:

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