Skip to Main Content
Oracle PL/SQL Programming: A Developer's Workbook
book

Oracle PL/SQL Programming: A Developer's Workbook

by Steven Feuerstein, Andrew Odewahn
May 2000
Intermediate to advanced content levelIntermediate to advanced
594 pages
11h 32m
English
O'Reilly Media, Inc.
Content preview from Oracle PL/SQL Programming: A Developer's Workbook

Intermediate

Q:

20-11.

The following function uses the MOD function to determine whether a number is odd:

CREATE OR REPLACE FUNCTION is_odd (i_val IN NUMBER)
   RETURN BOOLEAN
IS
BEGIN
   RETURN MOD (i_val, 2) = 1;
END;

Q:

20-12.

(d). The SQLERRM function returns the error code for a passed error number.

Q:

20-13.

You can print a general error message (or save it to a log) by using SQLCODE and SQLERRM in the WHEN OTHERS exception:

CREATE OR REPLACE PROCEDURE code_test
IS
   dummy_val VARCHAR2 (5);
BEGIN
   dummy_val := 'This string is way too big!';
EXCEPTION
   WHEN OTHERS
   THEN
      DBMS_OUTPUT.put_line (
         'Error Code (' || TO_CHAR (SQLCODE) || '):' || SQLERRM
      );
END;

Running this procedure in SQL*Plus generates the following output:

SQL> EXEC code_test
Error Code (-6502):ORA-06502: PL/SQL: numeric or value error

PL/SQL procedure successfully completed.

SQL>

Q:

20-14.

This table shows the formats required to produce the desired dates:

Desired Date

Required Format

May 21, 1994

‘Month dd, yyyy’

05/21/94

‘MM/DD/YY’

The 21st of May, 1994

‘“The “DDth” of “Mon”, “YYYY’

Quarter 2

‘“Quarter “Q’

Week 21

‘“Week “WW’

Week 3 in Month 05

‘“Week “W” in Month “MM’

The 3rd week in May

‘“The “Wth” week in “Month"’

Q:

20-15.

You can use the NVL function to rewrite the code snippet in one line:

name_list ( NVL(name_list.LAST,0) + 1) := next_name ;

Q:

20-16.

The following function uses the TO_NUMBER built-in function to determine whether the passed string is a number:

CREATE OR REPLACE FUNCTION is_number (i_val IN VARCHAR2) RETURN BOOLEAN IS tmp NUMBER; BEGIN ...
Become 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,
and much more.
Start your free trial

You might also like

Oracle Database 12c PL/SQL Programming

Oracle Database 12c PL/SQL Programming

Michael McLaughlin
Oracle PL/SQL for DBAs

Oracle PL/SQL for DBAs

Arup Nanda, Steven Feuerstein
Oracle PL/SQL For Dummies

Oracle PL/SQL For Dummies

Michael Rosenblum, Paul Dorsey

Publisher Resources

ISBN: 9781449324070Supplemental ContentErrata Page