February 2003
Intermediate to advanced
128 pages
2h 46m
English
book
Oracle PL/SQL Language Pocket Reference, Second Edition
by Steven Feuerstein, Bill Pribyl, Chip Dawes
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Java Language Integration
Java™ programmers can write server-side classes that invoke SQL and PL/SQL using standard JDBC™ or SQLJ calls. PL/SQL programmers can call server-side Java methods by writing a PL/SQL cover or call spec for Java using Oracle DDL.
Server-side Java in Oracle may be faster than PL/SQL for compute-intensive programs, but not as nimble for database access. PL/SQL is much more efficient for database-intensive routines because, unlike Java, it doesn’t have to pay the overhead for converting SQL datatypes for use inside the stored program. Oracle programmers will want to continue to use PL/SQL for programs that perform a lot of database I/O, and use Java for the best raw computation performance.
The first step in creating a Java stored procedure (JSP) is writing or otherwise obtaining functional Java code. Having source code is not necessary, though, so you can use class libraries from third parties. The classes must, however, meet the following requirements:
Methods published to SQL and PL/SQL must be declared static. PL/SQL has no mechanism for instantiating non-static Java classes.
The classes must not issue any GUI calls (for example, to AWT) at runtime.
If you write your own JSP, and it needs to connect to the database for access to tables or stored procedures, use standard JDBC and/or SQLJ calls in your code. Many JDBC and SQLJ reference materials are available to provide assistance in calling SQL or PL/SQL from Java, but be sure to review the Oracle-specific ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.