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CHAPTER 5 M THE MODELING LANGUAGE
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Figure 5-8. The Car example with the membership constraint for the Engine value in Car added You no longer have any error indications for the two modules in this code. This means that this code should successfully create the T-SQL code for generating the schema and table definition on the SQL Server side of the house.
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Generating T-SQL Code for the Car Model
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To generate the T-SQL code for this model, you will need to switch to Intellipad. Save your code in Quadrant as Car&EngineModel.m, and then exit Quadrant. Next bring up Intellipad and open this file. When the file is loaded, Intellipad will switch to M mode, which you will see in the menu bar. Select the M Mode T-SQL Preview menu option (as shown in Figure 5-9).
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CHAPTER 5 M THE MODELING LANGUAGE
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Figure 5-9. Setting up to generate a T-SQL code preview Figure 5-10 shows the generated T-SQL in the Intellipad right pane.
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CHAPTER 5 M THE MODELING LANGUAGE
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Figure 5-10. CarTypeExample with generated T-SQL Appendix E shows the complete listing for the generated T-SQL. You can see that the generated TSQL is substantially more complex than the M code used to define this simple two-type model. (There are a total of 254 lines in the generated T-SQL, including blank lines.) Defining a model in T-SQL from the ground up can be complex, error prone, and difficult to debug. This illustrates an important advantage of the M language and the SQL Server Modeling framework, which is the relative ease of defining a model quickly. The generated T-SQL could be used to deploy this model directly to SQL Server by creating the tables and schema, but this could also be done directly using the deployment facility in Quadrant.
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Computed Values
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M provides two ways in which values can be created: Stored values: You ve already seen stored values defined in type definitions for example, Mfr is a stored value of type Text for the manufacturer in a Car type definition. Stored values are also called fields, and translate to columns in a SQL table definition. Computed values: Computed values are derived by evaluating an expression and always occur within a module declaration, just as do type and extent definitions. Computed values can be considered equivalent to functions and can have zero or more arguments.
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CHAPTER 5 M THE MODELING LANGUAGE
An example of a computed value definition might be one that returns the sum of two numbers: Add(x : Integer32, y : Integer32) {x + y};
Here s an example of a computed value definition for the square of a number: Square(x : Integer32) {x*x};
In the instance of the CarTypeExample, you could add a HorsepowerPerCylinder computed value in EngineModule with the following line: HorsepowerPerCylinder(Eng : Engine) {Eng.Horsepower / Eng.Cylinders} Figure 5-11 shows the code in Intellipad with this computed value definition added, but the return value and arguments are ascribed to a Decimal19 so that a reasonable precision can be returned from dividing the two integers.
Figure 5-11. The Car example with a computed value definition.
CHAPTER 5 M THE MODELING LANGUAGE
M generates a T-SQL function definition for this computed value definition, as shown in the Intellipad T-SQL preview pane in Figure 5-12.
Figure 5-12. T-SQL code generated for the HorsepowerPerCylinder computed value in the M code. You might have noticed that this definition for the computed value could potentially have resulted in a divide-by-zero error in certain situations had you not constrained the number of cylinders to be an integer between 1 and 12 (line 15 back in Figure 5-3). The generated T-SQL code for this example, including the computed value, is shown in Appendix E.
Overloading
Overloading of computed value definitions is supported in M. This means that multiple computed values with the same name can be defined, as long as each definition has a different number of arguments. Selection of which definition is used by the compiler is determined by the number of arguments in the invocation. For example, the formula for the volume of a sphere, given the radius r is: V(r) = 4/3 r3 (where 3.14159) and would translate into the following expression for a computed value in M: Volume(R : Decimal19) {((4/3) : Decimal19) * 3.14159 * (R*R*R)}. You could have another computed value with the same name (Volume) for a rectangular cuboid with sides of length A, B and C:
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