You will also see planes landing from other destinations. From there, you will be able to see planes taking off for other destinations. Imagine yourself at any airport in the world. What Does the Bill of Materials Pattern Have to Do with Flights? We’ll start with a common example: the many-to-many relationship between flights and airports.
Once you can recognize a BOM, you’ll be able to make use of this powerful design pattern. Instead, we’ll focus on examples of where BOM structures might occur in database design. Without taking these into consideration, BOM management can become quite unmanageable.īut this specialist area is beyond the scope of this article. Changing a small part of a product can have multiple impacts on other product BOMs. Advanced modelling techniques are required to handle configurable products, component variations, or substitute components. BOMs that describe sub-assemblies like this are referred to as modular BOMs.įor manufacturers, a BOM is a critical piece of product information, a record that lists everything needed to manufacture a product. So if that assembly was to change, then all other BOM’s that use it will automatically be updated.
Once you define an assembly, its structure is automatically imported into any other assemblies that make use of it. For example, it’s important to know that one assembly needs 10 bolts, but another assembly might need 15 bolts of the same specification.
There often needs to be a hierarchy-specific quantity. For example, the same kind of bolt can be used in different types of assembly. Assemblies, sub-assemblies, and individual components can be reused. Here’s the simple product hierarchy from the Car example: ParentīOMs in manufacturing tend to have the same kind of major properties: This is the classic BOM structure, where a single table has two relationships with a junction table. The most basic manufacturing BOM model looks like this: The process of decomposition can go down to the very last nut and bolt – or even dab of glue – but you get the picture.Īt the simplest level, you’re joining two parts together in the form of a hierarchy – a parent part to a child part – from the top of the hierarchy right down to the bottom. There are different types of bodies: 3-door, 5-door, and estate (also known as a wagon or station wagon). In this example, there are different types of engines: V6 and V8. Broadly speaking, a Car has an Engine and a Body. It starts with the top-level product, Car. To illustrate a BOM, look at the conceptual model below. Other terms for the same thing are product structure, bill of material, and associated list. You can look at it as a hierarchical decomposition of a product. It is a list of the raw materials, sub-assemblies, intermediate assemblies, sub-components, parts, and the quantities of each needed to manufacture an end product. What Is a Bill of Materials, or BOM?Ī bill of materials has its roots in manufacturing. This article will introduce three very different examples to help you to recognize the pattern in your own projects. Historically, it’s been employed to model product structures, but the pattern can be used to do much more than simply define a hierarchy. The bill of materials (BOM) design pattern is deceptively simple, yet incredibly powerful.
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