By Feuerstein S., Pribyl B.
For the earlier ten years, O'Reilly's "Oracle PL/SQL Programming" has been the bestselling publication on PL/SQL, Oracle's robust procedural language. filled with examples and invaluable ideas, the ebook has helped all people - from newcomers to skilled builders, and from Oracle types builders to database directors - utilize PL/SQL.The fourth version is a entire replace, including major new content material and increasing insurance to incorporate the very most recent Oracle model, Oracle Database 10"g" unlock 2. It describes such new gains because the PL/SQL optimizing compiler, conditional compilation, compile-time warnings, average expressions, set operators for nested tables, nonsequential collections in FORALL, the programmer-defined quoting mechanism, the facility to backtrace an exception to a line quantity, numerous new integrated programs, and aid for IEEE 754 compliant floating-point numbers.The re-creation provides brand-new chapters on safety (including encryption, row-level protection, fine-grained auditing, and alertness contexts), dossier, e-mail, and internet I/O (including the integrated programs DBMS_OUTPUT, UTL_FILE, UTL_MAIL, UTL_SMTP, and UTL_HTTP) and globalization and localization.Co-authored by means of the world's top-rated PL/SQL authority, Steven Feuerstein, this vintage reference offers language syntax, most sensible practices, and wide code, starting from basic examples to accomplish purposes - making it a must have in your street to PL/SQL mastery. A spouse website comprises many extra examples and extra technical content material for superior studying.
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Additional info for Oracle PL/SQL Programming
Simplify your SQL statements. All the reasons you have to modularize your PL/SQL code apply to SQL as well -- particularly the need to hide complicated expressions and logic behind a function specification. From the DECODE statement to nested, correlated sub-SELECTs, the readability of many SQL statements will benefit from programmer-defined functions. 1 is the DBMS_SQL package. The modules in this package allow you to execute dynamic SQL DDL and DML statements. A SQL statement is dynamic when it is not parsed and bound at compile time.
A few raise their hands for three, and a special one or two believe in four arguments for INSTR -- four is the correct answer. If you don't know that INSTR has four arguments, then you don't really know what INSTR does -- and can do -- for you. Investigate and discover! Then there are the built-in packages, which greatly expand your horizons. These packages allow you to do things otherwise impossible inside PL/SQL, such as executing dynamic SQL, DDL, and PL/SQL code (DBMS_SQL), passing information through database pipes (DBMS_PIPES), and displaying information from within a PL/SQL program (DBMS_OUTPUT).
If you fetched into a record, however, upon recompiliation that record will take on the new structure of the cursor. • Encapsulate access to your data structures within packages. I recommend, for example, that you never repeat a line of SQL in your application; that all SQL statements be hidden behind a package interface; and that most developers never write any SQL at all. They can simply call the appropriate package procedure or function, or open the appropriate package cursor. If they don't find what they need, they ask the owner of the package (who is intimate with the complex details of the data structure) to add or change an element.