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Part IV
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PART IV
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Figure 14-1 Con ict resolution object relationships
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TIP Depending on the profile of your application, you may find that you use LINQ most often for querying data as opposed to making changes Furthermore, you ll generally be making changes to a very small dataset, whereas you may be querying much larger datasets In this situation, maintaining a separate DataContext object for updates is usually the most efficient approach In effect, you ll have one DataContext with object-tracking enabled that you can use for updates, and another with objecttracking disabled that you can use for queries Figure 14-1 shows the relationship between the conflict resolution objects Conflict resolution is covered in more detail later in this chapter in the section Record Level Conflict Resolution I ve covered the main functional elements of the gateway class for LINQ to SharePoint, and a few other objects are significant as well, such as EntityList, EntityRef, and EntitySet I won t cover these in detail since their operation is practically identical to similar objects used on other variants of LINQ; their usage will become apparent in the code samples that follow The DataContext object has special significance since it provides the gateway to using standard LINQ syntax, although, as you ll see when we look at SPMetal, generally the DataContext object isn t used directly; instead, common practice is to create a number of derived classes that represent each list in the data structure
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Hopefully, you now have a clear understanding of what LINQ is and how it works We need to use entity objects that represent the data in our application if we want to use LINQ syntax To illustrate the use of LINQ to SharePoint and the tools for generating entity classes, consider the following scenario: Your company is involved in renting industrial machinery You re working on a webbased application that allows customers to view a list of the items that the company currently rents, together with details of the individual rental contracts Customers come from a number of geographical locations and sometimes relocate equipment from one location to another To make it easier for customers to track the location of the rented equipment, your application allows the customer to add multiple notes for each item, and these notes should also be visible in your web application
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14
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LINQ to SharePoint and SPMetal
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NOTE You might appreciate a bit of clarification regarding some of the terminology used here You non-British readers rent equipment, and equipment is said to be rented from the company In the United Kingdom, we hire equipment, and equipment is said to be on hire when it is rented So an on-hire asset refers to an asset that can be rented and is subject to a rental contract (or hire contract) Since your company has a relatively small number of large customers, you ve opted for an extranet solution Each customer has a private site within your SharePoint farm that they can use to assist with managing their account with your company Since Hire Contracts are standard documents used by all customers, you ve defined a Hire Contract content type in your farm Each customer site has a Contracts document library that contains Hire Contract documents Additionally, you ve defined an On-Hire Asset content type that represents the individual item of machinery that is subject to the rental contract Each asset has a unique asset tag, and you allow customers to add notes against each asset tag in a separate list called Asset Notes If implemented using a relational database, your data structure would look similar to Figure 14-2 A common misconception is to equate a list or document library in SharePoint with a logical entity in your data structure However, this isn t necessarily the best approach and often making such an assumption makes you miss out on a lot of the real power of the SharePoint platform A more useful parallel is to equate a logical entity with a content type Since lists and document libraries can contain items of more than one content type, and sites can contain more than one list with the same content type, using lists and documents libraries to store items is mainly useful for setting security on a subset of items or for grouping items based on their status or some other business-specific reason Bearing this in mind, when we translate our data structure into a SharePoint model, we end up with something similar to Figure 14-3 Logically, we still end up with the same collections of entities, but our use of content types allows us to create an unlimited number of web sites, each with the same structure and permissions to view only the customer-specific subset of data
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