Oracle PL/SQL Programming: Guide to Oracle8i Features by Steven Feuerstein

By Steven Feuerstein

This concise and interesting consultant offers you a leap commence at the new PL/SQL beneficial properties of Oracle8i (Oracle's progressive "Internet database"). It covers self sustaining transactions, invoker rights, local dynamic SQL, bulk binds and collects, system-level database triggers, new integrated programs, fine-grained entry keep an eye on, calling Java tools from inside PL/SQL, and masses extra. encompasses a diskette containing a hundred records of reusable resource code and examples.

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40 41 A few weeks later, I start getting calls from my coworkers. " "Steven, I asked it to drop my table, and runddl said that there is no such table. " "Steven. . " Well, you get the idea. I begin to have serious doubts about sharing my code with other people. Sheesh, if they can't use something as simple as runddl without screwing things up . . but I decide to withhold judgment and do some research. I log into the COMMON schema and find that, sure enough, all of the objects people were trying to create or drop or alter were sitting here in COMMON.

NDS supports all SQL datatypes available in Oracle8i. So, for example, define variables and bind arguments can be collections, large objects (LOBs), instances of an object type, and REFs. On the other hand, NDS does not support datatypes that are specific to PL/SQL, such as Booleans, index-by tables, and user-defined record types. The INTO clause may, however, contain a PL/SQL record. Let's take a look at a few examples: 1. Create an index: EXECUTE IMMEDIATE 'CREATE INDEX emp_u_1 ON employee (last_name)'; It can't get much easier than that, can it?

Pkg */ CREATE OR REPLACE PACKAGE retry IS PROCEDURE incr_attempts (item IN VARCHAR2); PROCEDURE set_limit (item IN VARCHAR2, limit IN INTEGER); FUNCTION limit (item IN VARCHAR2) RETURN INTEGER; FUNCTION limit_reached (item IN VARCHAR2) RETURN BOOLEAN; PROCEDURE clear_attempts (item IN VARCHAR2); FUNCTION attempts (item IN VARCHAR2) RETURN INTEGER; FUNCTION attempts_left (item IN VARCHAR2) RETURN INTEGER; FUNCTION attempted_at (item IN VARCHAR2) RETURN DATE; PROCEDURE show_retries (item IN VARCHAR2 := '%'); END retry; / The programs are self-explanatory; the implementations are also very straightforward.

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