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The Users API consists of a UserService, a User object, and a UserServiceFactory that creates a new UserService. Methods for the service and User object are described in Tables 6-1 and 6-2. In addition to the Users API, you can use the standard Servlet API and access the request object s getUserPrincipal() method to determine if the user has logged in with his Google account. The servlet can also access a user s e-mail address with getUserPrincipal.getName(). According to the documentation, App Engine supports storing the User object in Bigtable as its own special data type, however it does caution against using it as a stable identifier. You can add entities to the data store that contain a User object but querying with these identifiers returns no results. Google says that it may update this service to utilize this user type, but for now your best practice is to persist the user s e-mail address instead. Table 6-1. Methods in the UserService class Method createLoginURL createLogoutURL Description Returns a URL that can be used to display a login page to the user. Returns a URL that can be used to log the current user out of this application.

Figure 13-31. The Change Data Source dialog box in VWDE offers more data source types than the same dialog box in VBE.

Now, are the spreadsheet skills I ve applied to these examples the kinds of things you can learn right away Well, maybe not right away; but with a modicum of determination and reflection and some concerted practice time, the skills begin to build After all, everyone starts at square one Excel is a vast application, and there s always more to learn about it There s a batch of features you have to know in order to be able to use Excel productively; there s also a large trove of features that are very nice to know, but not quite as indispensible No one expects you to learn all there is to know about the software, and your spreadsheet needs might be rather unprepossessing, after all.

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Figure 13-32. The Add Connection dialog box for Database Explorer in the VWDE Website project can reconfigure depending on the type of data source that you select. If you are working with database files that can remain local to a solution, such as SQL Server Express or Microsoft Access database files, you can copy them into the App_Data folder for a VWDE Website project. One easy way to copy database files to a VWDE project is with Windows Explorer.

A database connection in Database Explorer to an Access database in the App_Data folder of the current Tip VWDE project does not persist beyond the current session. However, a database connection to another folder outside the current project can persist across multiple sessions. As a result of this behavior, you have two options for working with Database Explorer database connections to Access database files. First, you can just re-create the database connection whenever you need it. Second, you can save the database file to another location, such as one outside the current VWDE project, in order to avoid having to re-create the database connection in Database Explorer whenever you need it between sessions.

I know you can keep a secret, and so I may as well confess in the interests of transparency that I ve never calculated a right-tailed student s t-distribution with Excel But the tool for doing so is there, however, and somebody out there is using it On the other hand, I have used other built-in formulas (called functions) named INDIRECT, RANDBETWEEN, and SMALL, and a raft of others that might actually help you do the work you need to do even if you don t realize it yet This book will strive diligently to introduce and explain the have-to-knows and many of the niceto-knows, too but all the while keep in mind that, in the matter of spreadsheets, more really is better Know more about Excel, and your ability to add value to your data analysis will burgeon This is an important point.

Figure 13-33 shows the WebCh13 Website project in VWDE with the App_Data folder expanded and selected. You can see the two primary database files. The northwnd_log.ldf file is related to the northwnd.mdf file. You can show the .ldf file by clicking the Expansion node (+) next to northwnd.mdf. The four database connections created for the WebCh13 Website project show in Database Explorer.

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