April 2002
Intermediate to advanced
336 pages
9h 58m
English
Content preview from Mastering Oracle SQLBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 11. PL/SQL
There are many fine books on the market that cover the PL/SQL language in great detail.[23] Because this is a book about Oracle SQL, the focus of this chapter is the use of PL/SQL within SQL statements as well as the use of SQL within PL/SQL programs.
What Is PL/SQL?
PL/SQL is a procedural programming language from Oracle Corporation that combines the following elements:
Logical constructs such as IF-THEN-ELSE and WHILE
SQL DML statements, built-in functions, and operators
Transaction control statements such as COMMIT and ROLLBACK
Cursor control statements
Object and collection manipulation statements
Despite its humble origins as a scripting language in Version 6.0, PL/SQL became an integral part of the Oracle server with release 7.0, which correlates to release 2.0 of PL/SQL. Because release 7.0 included the ability to compile and store PL/SQL programs within the server, Oracle began using the language to provide server functionality and to assist in database installation and configuration. When release 2.1 of PL/SQL was included with the 7.1 release of the server, Oracle added a new feature of particular use to SQL programmers: the ability to call PL/SQL stored functions from SQL statements (more on this later).
Along with the array of new features made available with each release of PL/SQL, Oracle began supplying prefabricated sets of PL/SQL functionality to allow programmers to tackle more sophisticated programming tasks and to help integrate with various Oracle ...
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