By Donald Bales
Start with PL/SQL, the integrated language that each Oracle developer and database administrator needs to comprehend, in starting PL/SQL, a fast paced and example-filled instructional. examine from writer Don Bales' huge adventure to find the main commonplace elements of PL/SQL with out losing time with imprecise and out of date features.Author Don Bales takes his 20+ years of expertise and a wealth of facts he is accumulated on PL/SQL utilization over these years and applies the 80/20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 such a lot wanted and utilized by PL/SQL pros and stay away from what is no longer worthwhile! the result's a publication that covers all of the key good points of PL/SQL with no wasting precious time discussing esoteric and out of date elements of the language. examine what fairly concerns, for you to get to paintings feeling convinced with what you recognize approximately PL/SQL. * detect the 20% of PL/SQL that offers you eighty% of the bang - key issues coated contain variables and datatypes, executing statements, operating with cursors, real-world items, debugging, checking out, and extra. * how one can write production-level, object-oriented PL/SQL - you will discover relational PL/SQL, yet in contrast to so much different books at the topic, Don Bales emphasizes using PL/SQL's object-oriented positive aspects besides. * paintings via actual examples of utilizing of PL/SQL - you are going to examine PL/SQL through making use of it to real-world company difficulties, no longer by means of heavy theory.What you will research * How very important SQL is in PL/SQL * tips on how to use PL/SQL in either a relational and object-relational surroundings * how you can createmaintainable, modular, and reusable PL/SQL application devices * the significance of trying out as you move, and of establishing an everlasting try out plan for every module * the significance of creating debugging functions into your code and development an enduring debug facility for every module * the significance of documenting as you cross, and within the strategy construction an everlasting documentation set to your reusable modules * how one can practice modular PL/SQL to unravel real-world problemsWho is that this e-book for?Anyone who desires to the best way to create saved systems opposed to an Oracle database utilizing PL/SQL. Programmers constructing purposes to be deployed opposed to an Oracle database will desire PL/SQL to take complete good thing about the ability Oracle has to supply. Database directors who desire to enforce performance uncovered in basic terms through PL/SQL package deal interfaces also will locate this e-book useful.About the Apress starting SeriesThe starting sequence from Apress is the precise option to get the data you want to land that the most important entry-level task. those books will educate you a customary and demanding expertise from the floor up simply because they're explicitly designed to take you from "novice to expert. you will begin your trip by means of seeing what you want to be aware of - yet with out unnecessary conception and filler. you are going to construct your ability set by way of studying how you can prepare real-world initiatives step-by-step. So no matter if your target is your subsequent occupation problem or a brand new studying chance, the start sequence from Apress will take you there - it's your depended on advisor via strange territory!"
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Additional info for Beginning PL/SQL
Possible Trigger Events Against a Table Event SQL Level AFTER UPDATE FOR EACH ROW AFTER UPDATE INSTEAD OF DELETE INSTEAD OF DELETE INSTEAD OF INSERT INSTEAD OF INSERT INSTEAD OF UPDATE INSTEAD OF UPDATE FOR EACH ROW FOR EACH ROW FOR EACH ROW So let’s say we want to play a practical joke. Are you with me here? We don’t want anyone to ever be able to add the name Jonathan Gennick (my editor, who is actually a genius in his own right, but it’s fun to mess with him) to our list of database geniuses.
Oh, it didn’t work? Well then try, try again until it does—or cheat and look at the examples in the appropriate source code listing directory for the book. Hey, you know what? We were supposed to put the data in the database in uppercase so we could perform efficient case-insensitive queries. Well, we should fix that. I guess we’ll need to use the UPDATE statement. C HA PTER 1 ■ G ENES IS Update An UPDATE statement allows you to selectively update one or more column values for one or more rows in a specified table.
Let’s fix that quickly! Type ROLLBACK; at your SQL*Plus prompt and then press the Enter key. The transaction— everything you did from the last time you executed a COMMIT or ROLLBACK statement—has been rolled back. So it’s as though we never deleted Darwen’s entries. You didn’t really think I was going to let you delete Darwen, did you? Now we are ready to reach the summit of the mountain SQL, the ultimate, heavy-duty query statement: SELECT. Select In the end, all the power of a relational database comes down to its ability to manipulate data.