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Overview of Lists
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I mentioned earlier in the book that lists in SharePoint are not much more than database tables on steroids. Although that is true, I would like to elaborate a bit on what I mean by that.
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CHAPTER 6 WHAT LURKS IN THE FOREST OF LISTS
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Lists consist of columns, which I will discuss in much more detail in 9. Lists are the primary storage facility of SharePoint, and most everything is stored in some kind of list. Even libraries, wiki sites, and web portals are just lists of files, articles, and pages. If you are SQL savvy, it should be easy to understand how the features of SharePoint lists map to database tables. Table 6-1 shows several of the features and the similarities to a database table. Table 6-1. SharePoint Lists Compared to Database Tables
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SharePoint Terminology
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List Item Column Event receivers Field type View List forms
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Table Row Column, sort of Triggers Data type View Nothing, really
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Although not exhaustive, this table should make it clear that lists can be compared to database tables. That being said, plenty of factors differ as well. For instance, the concept of referential integrity does not exist in SharePoint. You can have lookup fields that reference other tables, but there is nothing that prevents you from deleting the referenced items or even lists. Another example is CAML vs. SQL. You do have some SQL ideas in CAML, but CAML is nothing near as powerful for data definition and data manipulation. So, I might actually rephrase the initial statement a bit: a SharePoint list is like a database table on steroids but with a limp.
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The Road Ahead
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OK, let s get down to the fun parts, the technical stuff. Lists, being the primary storage facility and being compared earlier to database tables, offer surprising amounts of flexibility and customization options. To understand these options, you need to understand the underlying definitions that create and manipulate lists. But first, as always, let s look at a cool screenshot and some annotations. That way, you can show the book to your boss and say, Hey, here s a book that shows how SharePoint lists work, and your boss will understand. Bosses like that. See Figure 6-1. You should make sure your boss is happy. Bj rn the Elder
CHAPTER 6 WHAT LURKS IN THE FOREST OF LISTS
Figure 6-1. A SharePoint list. Note the Maybe annotation; it is important. Now, I am not trying to insult your intelligence by showing you this. As SharePoint developers, we are very familiar with this view, but it might still hold some clues that are important. The page you see in Figure 6-1 is a list form, the AllItems.aspx form actually, and as you will discover later in this chapter, list forms can be highly customized. In fact, they are nothing more than plain ASP .NET pages, and once you know that, you also know you can make them look and behave just as you like. The same applies to other forms that are associated with the list. When you click an item, you go to the DisplayForm. When you edit an item, well, that would be the EditForm. And if I tell you there is a form called NewForm, I am going to credit you with enough brains to figure out what that form does. I ll talk more about forms later. Another interesting aspect of Figure 6-1 is that it shows most of the components of a list. You have the columns there, the items, a list form, the list name and description, the toolbar all these components are defined in the list definition, which is basically just a set of CAML files that tell SharePoint how the list should be created. The list definition consists of a list template as well as a list instance. Compare this to the object-oriented way of thinking, and the list template is the class, while the list instance is the object. As such, the list template defines how the list should look and behave, while the list instance is the actual storage medium for items in the list. I will cover both list templates and list instances later as well.
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