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Metaprogramming is a technique whereby code can manipulate its own data at either compile time or runtime. Although it has many advantages, the most useful feature by far provided by metaprogramming is introspection, which allows the definition of a business model core that can then be reflected into other components of the system. In practice, that means you can have an entire set of distinct and unrelated user interface elements based on the same class. Recall the Point example from 2: class Point; has 'x' => ( is => 'rw', isa => 'Int' ); has 'y' => ( is => 'rw', isa => 'Int' ); To many of us, Moose is simply a clean, maintainable way to do Perl OO, add accessors and validation, and abstract things we do commonly. But it is actually much more. Its introspection facilities allow us to give semantic meaning to attributes, classes, and methods. You can easily think of the preceding code represented as a database table: CREATE TABLE point ( x INTEGER, y INTEGER );

Listings 9-32 to 9-34 show a first example of a flashback query. First, we select the current situation with a regular query (Listing 9-32). Then we use the AS OF TIMESTAMP option in the FROM clause to go back in time (Listing 9-33). Finally, we look at what happens when you try to go back in time beyond the amount of historical data that Oracle maintains (Listing 9-34). As in examples in earlier chapters, we use the SQL*Plus ampersand (&) substitution trick, which allows us to repeat the query conveniently with different timestamp values. Listing 9-32. Evaluating the current situation select empno, ename, deptno, msal from e; EMPNO ENAME DEPTNO MSAL -------- -------- -------- -------7499 ALLEN 30 1610

If a vendor is to supply data in a Concordance format, the actual names of the files should only use alphanumeric data. No white space or nonalphanumeric characters should be used. A database for the matter John Q. Public vs. The Acme & White Corporation shouldn t be named John Q. Public vs. The Acme & White Corporation.dcb. This name is somewhat unwieldy, and the use of white space, the period, and the & symbol might confuse other software tools that technical staff might use for scanning network files to provide administrative summary reports about network usage. Most firms or corporations use some sort of internal accounting number to identify a project. Perhaps an accounting department has assigned the matter John Q. Public vs. The Acme & White Corporation the abbreviation JQPvAcmeWhite. Some accounting departments will assign a matter a purely arbitrary designation, such as a combination of letters and numbers: JQP00010. These accounting designations are ideal names for databases, with the addition of a date. For example, JQPvAcmeWhite_LOAD_071004.dcb represents a database provided by a vendor on July 10, 2004. If a vendor supplies data in a different format, these same types of naming conventions should be applied. JQPvAcmeWhite_LOAD_071004.txt is a viable name for a delimited load file. The key is that names should be concise and, if possible, should describe the purpose of the file.

Or how about using the metadata you have available so you never have to write a form again <form name="point"> <input name="x" value="..."> <input name="y" value="..."> </form> Both the database table and the HTML from the form can be inferred by the class definition. These are very basic examples, and Reaction allows you to define very complex systems in this manner.

7521 7654 7698 7844 7900

30 30 30 30 30

Field names also should be concise and, if possible, self-explanatory. Concordance has a limit of 12 characters per field name. For example, the field name FILEEXTENSION must be trimmed to FILEEXTENSIO to fit into the allowed space provided by Concordance. The type of data that the field named FILEEXTENSION contains is clear; FILEEXTENSIO is somewhat less self-explanatory. If data is to be supplied in delimited text files, the vendor should be directed to include field names as the first line of each file. Field names should be uniform across all data loads. Without a specific designation of field names, a vendor might provide subsequent sets of data with inconsistent names. For a database that contains a document date field, one data load might use the field name DOCDATE, while another might use the field name CREATE_DATE. This is more than a matter of cosmetics, but also of efficiency: you might be required to load dozens of separate data sets into the same