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No, it s not that you re getting out of shape from sitting there learning about PL/SQL. In this context, BULK COLLECT is about reducing the number of transitions between the PL/SQL engine and SQL engine, in order to improve efficiency and speed of your PL/SQL program. (Although, if I look down, it appears that sitting and writing this book all day long, every day, has led to some bulk collection of another kind.) The idea is simple. Every time you execute SQL from your PL/SQL program, PL/SQL must hand off the SQL statement to the Oracle database s SQL engine. When the SQL engine is finished, it returns its result to the PL/SQL engine. Flip-flopping back and forth from PL/SQL to SQL and back again takes time. Since version 8 of Oracle, you can reduce the number of transitions between PL/SQL and SQL by using the BULK COLLECT command. Rather than fetch one row at a time from the SQL engine, you can fetch perhaps one hundred at a time into a PL/SQL collection, which can be a PL/SQL table (or array). Although three types of PL/SQL collections exist, I m going to cover only the use of associative arrays, or as they were once called, PL/SQL tables. Once you re comfortable programming in PL/SQL, I recommend you go back and learn about the other two in a good reference (such as PL/SQL Programming by Steven Feuerstein and Bill Pribyl).

Tip A useful function for traversing directories is os.walk. Check it out in the Python Library Reference.

Since we ve been working with cursors, let s continue to talk about them. Listing 5-10 is yet another incarnation of Listing 5-1, the select the Doe family assignment. This time, however, it has been coded to use BULK COLLECT. Listing 5-10. An Example of Using BULK COLLECT with a CURSOR, cursor_bulk_collect_the_doe_family.sql. 01 02 03 rem cursor_bulk_collect_the_doe_family.sql rem by Donald J. Bales on 12/15/2006 rem An anonymous PL/SQL procedure to select

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Tapestry is an open source Java Web application framework created by Howard Lewis-Ship and a talented group of contributors Tapestry is distributed under the Apache Software License version 20 In Tapestry, as opposed to other frameworks like Struts, you deal with components and pages (which are themselves components), and interactivity is provided via listeners which interpret the user s actions associated with a component A Tapestry application is made of pages Each page consists of a template and a number of components The templates are standard HTML pages decorated with span tags declaring the Tapestry components Tapestry is built on top of the servlet API, but unlike other frameworks, it completely abstracts the procedural request-response nature of the Web by allowing you to work with pages and components in a similar way that a Java Swing developer works with forms and components.

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The mapping os.environ contains environment variables described earlier in this chapter. For example, to access the environment variable PYTHONPATH, you would use the expression os.environ['PYTHONPATH']. This mapping can also be used to change environment variables, although not all platforms support this. The function os.system is used to run external programs. There are other functions for executing external programs, including execv, which exits the Python interpreter, yielding control to the executed program, and popen, which creates a file-like connection to the program. For more information about these functions, consult the standard library documentation.

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As with many Web frameworks, Tapestry takes the drudgery out of common tasks and functionality like state management, input validation, localization and internationalization, and error reporting But instead of dealing with URLs, HTTP requests, and responses, you work at a higher level of abstraction dealing with user interaction with the pages and components in an object-oriented way As in a Swing application, components and pages know how to respond to events which are mapped from the HTML component view representation to the Java implementation One of the greatest strengths of Tapestry for a Web development team lies in its strong separation of concerns between Web designers and Java developers It also brings true objectoriented development to Web applications As a former Delphi and Swing developer, I was initially attracted to experiment with Tapestry by this factor.

rem the first names for the Doe family from rem the Worker table. set serveroutput on size 1000000; declare cursor c_worker( aiv_last_name in WORKER_T.last_name%TYPE) is select first_name from WORKER_T where last_name like aiv_last_name||'%' order by id; TYPE c_worker_table is table of c_worker%ROWTYPE index by binary_integer; t_worker c_worker_table;