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The Modeling Services Folder Pattern
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Modeling Services uses a folder pattern as the foundation of several of its services, including claimsbased Security, Versioning and Change Management, as well as Auditing. Any table can be given a folder field, so Modeling Services support organizing data into logical folders. In other words, any row from any table can belong to a given folder, and, like file system folders in DOS, Windows, or UNIX, repository folders can be organized in a hierarchical structure. The folder structure in Modeling Services is very simple and is illustrated in Table 6-1. Each folder has three values: An integer Id, which corresponds to its primary key in the folders table A text name An integer folder field, which is null if it is a top-level folder, or the Id of a higher level folder if it is a child folder of the higher level folder.
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Table 6-1 is an example of a folder structure for a very simple quality control (QC) system that you will apply to the CarComponents model discussed in 4.
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APTER 6 SQL SERVER MODELING SERVICES THE FOLDER PATTERN
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Table 6-1. QC Folders for CarComponents
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1 Repository 500 QC 510 QC 520 QC 530 QC
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Name
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Parent Folder
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Level Critical High Standard
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NULL 500 500 500
Example: A Quality Control System for CarModel
Following along the lines of Table 6-1, you will name three QC levels of Critical, High, and Standard. A QC level of Critical might be applied to components that have an important impact on safety-related aspects of the car, such as brakes, air bags, seat belts, suspension, and so forth. A QC level of High might be required for components that affect the mechanical performance of the car, such as the drive train components. A QC level of Standard would be required of the parts not classified in the first two categories, and could include items such as carpeting, dome lights, and so on. QC ratings and criteria apply to all components of the system, so this is a natural area where a horizontal partitioning of the data (across a number of tables or types) works very well. Table 6-2 shows the earlier car components table (cf. 4), with a QCFolder column added, and a QC Folder Id corresponding to one of those enumerated in Table 6-1 assigned for each component. Table 6-2. CarComponents Model with QC Folders Added
1C 2 3 4 Bo 5 5 St 6
Name
ar Drive Train Suspension dy Interior eering Engine
Level
1 2 2 2 3 2 3
Description
Top Level Makes the car go Makes the ride smoother Metallic Blue Seats, carpeting, etc. Makes it turn 220hp V8
Quantity
1 1 1 1 1 1 1
Part Of
NULL Car Car Car Body Car Drive Train
QC Folder
520 520 520 520 530 510 520
CHAPTER 6 SQL SERVER MODELING SERVICES THE FOLDER PATTERN
7 8 9 10 11 12
Pistons Valves Shock Absorbers Wheel Assembly Disk Brake Floor Covering
4 4 3 3 4 4
Drive the crankshaft 8 intake, 8 exhaust One for each wheel One for each wheel One for each wheel Carpeting and Mats
8 16 4 4 4 1
Engine Engine Suspension Drive Train Wheel Assembly Interior
520 520 520 510 510 530
A note to the reader: This very simple QC system is just an example intended to illustrate a possible use of the folder pattern provided by the SQL Server Modeling Services. It isn t intended to emulate the design for a real-world manufacturing QC system, which would be considerably more complex. I could just as easily have said that all parts are painted one of three colors (red, green, or blue) for the purpose of this example. Also, for the purpose of illustrating the folder model, I ve added a few more components than what you saw in the CarModel example used in 4. Finally, the term CarModel refers to the name of the overall model in that example, which is also the name of the M module. (To be entirely accurate, the module name was Car.Model , but I ve dropped the period for the purposes of this discussion.) CarComponent is the type that is defined in that module, and CarComponents is the name of the extent for the CarComponent type. Here is where I can talk about how Repository folders are created, organized, and managed using the SSMod tool set (Intellipad, Quadrant, and the command-line tools) and Visual Studio. Let s open Intellipad and reload (or re-enter) the code for 4 s CarModel example. It should look something like that shown in Intellipad Figure 6-1.
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