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As you can see, the table designer in an Access project is very similar to the one in a desktop database. (See Figure 2-7 on page 25.) In an SQL Server database, fields are called columns. SQL Server supports a wider variety of data types than does an Access desktop database. Many of the data types are identical, but they have different names in SQL Server. For example, the int data type in SQL Server is the same as the Long Integer data type in a desktop database. If you want, you can click the View button to switch to Datasheet view, but you ll find that Datasheet view in an Access project is identical to that in a desktop database. You can learn all the details for creating tables in a project in 17, Building Tables in an Access Project. Close the table design window to return to the Database window. 49

standard safe mode except that Windows runs the command prompt application (Cmd.exe) instead of Windows Explorer as the shell when the system enables GUI mode. Windows includes a fourth safe mode Directory Services Restore mode which is different from the standard and networking-enabled safe modes. You use Directory Services Restore mode to boot the system into a mode where the Active Directory service of a domain controller is offline and unopened. This allows you to perform repair operations on the database or restore it from backup media. All drivers and services, with the exception of the Active Directory service, load during a Directory Services Restore mode boot. In cases where you can t log on to a system because of Active Directory database corruption, this mode enables you to repair the corruption.

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It s also important to note that Add will properly handle content that implements IEnumerable. When a content item that implements IEnumerable is passed to the Add method, each item within the IEnumerable is recursively added to the XElement. This allows LINQ queries to be used to construct XML, since the standard query operators, as well as all of the XML query axis methods provided by LINQ to XML, return IEnumerable<XElement>. In chapter 10, we ll discuss the querying capabilities of LINQ to XML in depth and show how the functional construction pattern of creating XML can be combined with query expressions to create and transform XML. For the time being, let s look at the following example, which shows how we can leverage the support for IEnumerable within the Add method to add all the child elements in an existing XML document to an XElement.

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XElement existingBooks = XElement.Load("existingBooks.xml"); XElement books = new XElement("books"); books.Add(existingBooks.Elements("book"));

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Although all query objects in a desktop database are called simply queries, you ll find that SQL Server stores three different types of objects views, functions, and stored procedures that Access displays when you click the Queries button on the Object bar in the Database window, as shown in Figure 2-32.

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By default, when an item is added to an XElement, it is added as the last child of the element. If the content being added is an XElement, the element is added as the last child element. If the content is an XAttribute, the attribute is the last attribute defined within the element. If this isn t the behavior you re after, don t worry. XElement offers several alternate methods. To add the child as the first child, you can call AddFirst. Alternatively, if you know precisely where you want the element placed, you can navigate to an element and call AddAfterSelf or

Figure 2-32. The list of views, functions, and stored procedures displayed as queries in the Contacts.adp sample project file.

A view returns a filtered view of data from one or more tables A function can return a table, or it can perform a calculation and return a single value, much like a Visual Basic function The difference is that a function you see in the queries list in a project file Database window executes on SQL Server, and the server returns the result to your project A stored procedure can be as simple as an SQL statement that returns rows from one or more tables, or it can contain a complex program written in Transact-SQL (the programming language for SQL Server) that tests conditions and perhaps updates one or more tables in your database In many cases, you can design a view, function, or stored procedure using a query designer that is similar to the designer you use in a desktop database.

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