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Once you have a User often from request.user, but possibly through one of the other methods discussed shortly you have a number of fields and methods available on that object. AnonymousUser objects emulate some of this interface, but not all of it, so you should always check user.is_authenticated() before assuming you re dealing with a bona fide user object. Tables 12-3 and 12-4 list the fields and methods, respectively, on User objects. Table 12-3. Fields on User Objects

Providing graceful error handling when something goes awry Since persistence involves interacting with an external file system, database management system, application server, and/or network, there are many potential points of failure that are outside of an application s immediate control The best we can do as application developers is to anticipate and programmatically recover from such issues whenever possible..

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SQL offers an alternative way to specify equijoins, allowing you to explicitly specify the columns you want to participate in the equijoin operation. As you saw in Listing 8-8, you can use the ON clause followed by fully specified join predicates. You can also use the USING clause, specifying column names instead of full predicates. See Listing 8-10 for an example. Listing 8-10. JOIN ... USING Example select e.ename, e.bdate , h.deptno, h.msal from employees e join history h using (empno) where e.job = 'ADMIN'; ENAME -------JONES MILLER MILLER MILLER MILLER BDATE DEPTNO MSAL ----------- -------- -------03-DEC-1969 30 800 23-JAN-1962 10 1275 23-JAN-1962 10 1280 23-JAN-1962 10 1290 23-JAN-1962 10 1300

By the end of this chapter, you ll have a solid appreciation of these matters, regardless of what type of persistence you ultimately choose for a given application.

Required; 30 characters or fewer. Alphanumeric characters only (letters, digits, and underscores). Optional; 30 characters or fewer. Optional; 30 characters or fewer. Optional. Email address. Required. A hash of, and metadata about, the password (Django doesn t store the raw password). See the Passwords section for more about this value. Boolean. Designates whether this user can access the admin site.

In this section, we ll look at the fundamentals of the Java file input/output (I/O), which is based on streams or the reading and writing of data from various sources.

Note that you need tuple variables again, because you join over only the EMPNO column; the columns h.DEPTNO and e.DEPTNO are now different. Figure 8-3 shows the syntax diagram of the ANSI/ISO join syntax, including the NATURAL JOIN operator, the ON clause, and the USING clause.

The basic Java approach that we re going to use for reading records one by one from a text file involves two special types of Java object. 1. First, we ll instantiate a FileReader, a type of Java object that knows how to open a file and read data from the file one character at a time. 2. Next, we ll pass a reference to this FileReader object as an argument to the constructor for a BufferedReader, a more sophisticated type of object that effectively encapsulates the FileReader. The BufferedReader s readLine method knows how to internally gather up, or buffer, individual characters as read by the FileReader until an end-of-line character is detected, at which point the BufferedReader hands back a complete line/record of data to client code. This process is illustrated conceptually in Figure 15-4. Both the FileReader and BufferedReader classes are defined in the java.io package.

Boolean. Designates whether this account can be used to log in. Set this flag to False instead of deleting accounts. Boolean. Designates that this user has all permissions without explicitly assigning them. A datetime of the user s last login. This is set to the current date/time by default. A datetime designating when the account was created. This is set to the current date/time by default when the account is created.

Figure 15-4. A BufferedReader returns complete records to client code with help from an encapsulated FileReader. Here s a bit of pseudocode to illustrate the basics of reading from a file. I ve left out some of the fine-point details, but you ll see this process carried out in earnest in the various SRS classes that we ll review later in this chapter.

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