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CHAPTER 4 INTRODUCTION TO QUADRANT
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Level 2 corresponds to the highest level subsystems of the car, such as the drive train or suspension or body. Level 3 corresponds to subsystems of the Level 2 systems, and so on down the tree, until you reach the atomic level (in the system perspective) of nuts, bolts, washers, and other things that can t be deconstructed any further. Description: Text indicates unrestricted text, as with the name, and the appended Kleene operator ( ) indicates either 0 or 1 occurrence. In other words, the Description text is optional, or in database parlance, nullable. PartOfComponent: CarComponent where value in CarComponents means that the type instance can be null (the Kleene operator again), or can be part of another CarComponent instance. If a component is part of another subsystem, the parent system must be in the CarComponents collection. In fewer words, the parent component must exist in the extent. This illuminates a self-referential aspect to the model: One entity in the model can be a parent or child entity of another entity in themodel, and the PartOfComponent Id will be a foreign key referring to another entity existing in the scope of the same model and (in the database perspective) table. Quantity: This indicates the number of components needed to complete the system or parent subsystem. For example, eight pistons are required for a V8 engine, and four wheels are required for a car.
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Note that the terminating semicolon (;) after the ending right brace in the code indicates the end of the type definition. Line 14: Where identity (Id); This line of code assigns the identity (primary key in the context of the database) to the value of Id. Line 17: CarComponents: {CarComponent*}; This declares the CarComponents extent (which results in creating a table of the same name in the database). Think of an extent in the model context as mapping directly to a table in the database context, with each entity within the extent corresponding to a record in the database table. In the present context, the extent is declared to be the collection of all CarComponents. The curly braces indicate a collection, and the asterisk is a Kleene operator indicating 0 or more occurrences of CarComponent instances within the collection. Kleene operators are also called repetition operators in the M language specification, and there are three of these: * means zero or more occurrences of an item (as previously described). + means one or more occurrences of an item. means zero or one occurrence of an item. This essentially means the item is nullable, or optional.
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This is the complete code for the simple car model. It allows you to model the car as a composite of subsystems and components in any number of different system levels. You could, if you wanted to, take this down to the level of nuts, bolts, O-rings, grommets, and gaskets, with thousands of records for these subsystems and components in the table.
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CHAPTER 4 INTRODUCTION TO QUADRANT
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To save this code as an M file, click File Save File As in the Quadrant menu bar (see Figure 4-5), and save the file as CarModel.m.
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Figure 4-5. Saving the Car.Model code as Car.Model.m
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Deploying the Model to SQL Server
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Once the M file is saved, you re ready to deploy the model as a schema to SQL Server. In Quadrant, you are able to deploy the model directly to the SQL Server database without having to use the commandline tool set as you did in the last chapter. To use this procedure for deploying the model, click Data Deploy in the menu bar (see Figure 4-6). (As the menu indicates, Ctrl+F5 will also work.)
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CHAPTER 4 INTRODUCTION TO QUADRANT
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Figure 4-6. Deploying CarModel.m to SQL Server A dialog box will pop up, as shown in Figure 4-7, giving you the option to deploy to the existing database session, to replace an existing database (this would replace the database, including schema and data), or create a new database.
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