By Donald Bales
Beginning Oracle PL/SQL will get you all started in utilizing the integrated language that each Oracle developer and database administrator needs to be aware of. Oracle Database is brim-full of integrated software beneficial properties which are unfastened for the utilizing, and PL/SQL is your price tag to studying approximately and utilizing these good points out of your personal code. With it, you could centralize enterprise common sense within the database, you could offload program good judgment, and you may automate database- and application-administration projects.
Author Don Bales presents in Beginning Oracle PL/SQL a fast paced and example-filled instructional. study from Don’s large adventure to find the main regular features of PL/SQL, with out losing time on vague and out of date positive aspects.
The writer takes his 20+ years of expertise and a wealth of facts he is accumulated on PL/SQL utilization over these years and applies the 80/20 rule: hide what is so much wanted and utilized by PL/SQL pros and stay away from what is now not invaluable! the result's a booklet that covers all of the key positive aspects of PL/SQL with out wasting precious time discussing esoteric and out of date elements of the language. research what rather concerns, for you to get to paintings feeling convinced with what you recognize approximately PL/SQL.
- Covers the main themes that subject, together with variables and datatypes, executing statements, operating with cursors, bulk operations, real-world items, debugging, checking out, and more.
- Teaches you to jot down production-level, object-oriented PL/SQL. you will discover relational PL/SQL, yet not like so much different books at the topic, this one emphasizes using PL/SQLs object-oriented good points as well.
- Guides you in operating via genuine examples of utilizing of PL/SQL. you are going to examine PL/SQL by way of utilizing it to real-world company difficulties, now not by way of heavy theory.
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Extra info for Beginning Oracle PL/SQL
END: Every PL/SQL block ends with the keyword END. Anonymous Blocks We’ll start with an anonymous PL/SQL block. It’s called anonymous because it’s not going to be saved in the database, so it will never have a name. In practice, you won’t find yourself using anonymous blocks in production, but you’ll use them throughout the development process. They’re perfect for creating test units that you’ll eventually move into your stored PL/SQL blocks. You’ll learn more about that in Chapter 8. For now, let’s look at an example.
An Example of Nesting Blocks As you saw, the test unit for procedure pl() in Listing 2-7 stopped executing after line 28 because line 28 caused the following error: ORA-20000: ORU-10028: line length overflow, limit of 32767 bytes per line 48 Chapter 2 ■ Blocks, Functions, and Procedures In Listing 2-8, I’ve recoded the pl() test unit. This time, I’ve blocked the lines that I expect to fail, so the program will catch any raised exceptions and continue processing the code all the way to the end of the source code listing.
Listing 1-22. sql 1 2 3 SELECT name FROM authors ORDER BY name; NAME ------------------CHRIS J DATE EDGAR F CODD HUGH DARWEN 21 Chapter 1 ■ Relational SQL Listing 1-22 actually shows the query (SELECT statement) executed in SQL*Plus, along with the database’s response. The syntax of the SELECT statement in Listing 1-22 is as follows: SELECT