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Unfortunately, most modeling tools use a proprietary format However, the tool you use should be able to export your models to images and, ideally, to XML documents This capability will make the tool interoperable with a wide range of modeling software and will help you share your model with other users Finally, the tool should be able to export its metadata to as many formats as possible, particularly those used by UML tools
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It is also ideal to be able to import flat files, such as SQL scripts, to generate (reverse-engineer) databases Although you won t use this feature a lot to generate new models, it can be helpful to start with an existing physical model in order to generate a new logical data model If your tool can import the schema of a physical database, it can be a real time-saver
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Several of the available data modeling tools can not only help you generate the logical data model but also help create a physical model for use in the SQL Server 2008 database you are deploying to This feature can also be a huge time-saver during the development phase and, when used with proper change management and source code management, can even assist in deploying databases and managing versions of databases that are deployed In our opinion, this capability is high on the list, particularly for larger environments Most data modeling tools, particularly those that advertise themselves as enterprise class, will offer far more features than these However, these are the primary pieces of functionality that any data modeling tool should offer To make sure it meets the needs of your project or job, be sure to thoroughly review any modeling software before buying
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So far, this book has been about setting the groundwork for building a data model for a realistic scenario We ve covered everything from the basic definition of a data model to the details of each type of data a company may need to store We now have all the tools necessary to begin building a data model for Mountain View Music (we abbreviate the company name as MVM throughout the remainder of this chapter) First, we lay out how our various data points from the requirements gathering phase will map to the objects we ll create in a data model We also discuss implementing business rules in a data model
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When the user interviews and surveys were conducted in the requirements gathering phase, we made sure to take notes regarding certain key words, usually nouns, which represented the types of data that the new model
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(and its eventual database) would have to support We now need to narrow that list to a final list of the most likely suspects For example, Table 71 shows the list of nouns gathered during requirements gathering, along with a brief description of what the noun refers to You ll recognize this is almost the same list from 6; however, we ve added some entities, as we discuss in a moment This list of entities accounts for some specific issues that arise when you try to relate these entities to one another, as well as issues created by moving to an online system Because the other entities have been discussed in detail, we ll review the new ones and explain why they exist
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Lists and List Items These entities account for a type of information that exists only to support the system and is not accounted for in traditional requirements gathering In this case, we realized that we would need to track the status of shipments, and because items in a single order can be shipped in separate shipments, we need to relate the status of all order items and the shipment they are part of Additionally, we need a flexible list of status codes, because that kind of data can change based on business rules Finally, we realized that this subset of information is not the only lookup-style information we might need In the future, there may be needs to create lists of information based on status, product type, and so on So we built a flexible solution by creating these generic Lists and List Items entities Lists represents any list of information we might need for example, the status of an order List Items is simply a lookup table of potential items for the list in this case, the status codes With this solution, we can add any type of list in the future without adding other entities Product Attributes When addressing the existence of a product, you must account for where that product comes from and how it is packaged and sold Additionally, for a company like MVM, it is necessary to deal with the fact that different products have different kinds of attributes For example, a guitar does not have all the same physical attributes as a saxophone (although there are some attributes in common) To model this scenario correctly, it became necessary to create a Product Attributes entity that represents various types of attributes a product can have So instead of including every possible attribute for all products in the Product entity, we ve essentially created an
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