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However, until Oracle 10g, it has not been possible for developers to intervene in the exception in any way whilst retaining this information (for example to record the exception and its You can find this code in the 12c_utl_call_stack_helper.sql and 12c_utl_call_stack_helper_demo.sql files. SQL> Starting with the call to DISPLAY_CALL_STACK, we can work back through all the nested calls to the original anonymous block. I will continue to use my_putline , since the backtrace could be very long if the call stack is deep (and your program names are long).

Instead, I can very surgically find, display, and/or log the key information I need. If you did want to see this information, you had to allow the exception to go unhandled, at which point the full error backtrace was displayed on the screen or was There is, however, always room for improvement, and that is why Oracle Database 12c added UTL_CALL_STACK. It is useful for alternate formatting of stack traces.

In the below example I redirect the same into dbms_output. /*CALL WITH ERROR BACK TRACE*/ SET SERVEROUTPUT ON; BEGIN PROC4(); EXCEPTION WHEN OTHERS THEN DBMS_OUTPUT.PUT_LINE(‘-------------------------------------------'); DBMS_OUTPUT.PUT_LINE(DBMS_UTILITY.FORMAT_ERROR_STACK); DBMS_OUTPUT.PUT_LINE(DBMS_UTILITY.FORMAT_ERROR_BACKTRACE); DBMS_OUTPUT.PUT_LINE(‘-------------------------------------------'); END; anonymous block That way, I can avoid hard-coding these values later in my program (and possibly more than once). ERROR_MSG : The error message associated with the current line in the error stack. This article explores the problem that this function solves and how best to use it.

The first line of the stack is where the exception was raised. Line Unit --------- --------- -------------------- 1 5 TEST.TEST_PKG 2 13 TEST.TEST_PKG 3 18 TEST.TEST_PKG ***** Backtrace End ***** PL/SQL procedure successfully completed. The DBMS_UTILITY.FORMAT_ERROR_BACKTRACE function gives us the flexibility we have been demanding for years and the information that the DBMS_UTILITY.FORMAT_ERROR_STACK function simply didn't provide. Monday, January 4, 2010 DBMS_UTILITY - Call Stack, Error Stack and Error BackTrace DBMS_UTILITY.FORMAT_CALL_STACK - used to trace calling of programsDBMS_UTILITY.FORMAT_ERROR_STACK - used to seeDBMS_UTILITY.FORMAT_ERROR_BACKTRACE - used to locate the original

The module defines the following functions: traceback.print_tb(tb[, limit[, file]])¶ Print up to limit stack trace entries from the traceback object tb. import sys, traceback def run_user_code(envdir): source = raw_input(">>> ") try: exec source in envdir except: print "Exception in user code:" print '-'*60 traceback.print_exc(file=sys.stdout) print '-'*60 envdir = {} while 1: run_user_code(envdir) Answer to Previous Challenge The PL/SQL Challenge question in last issue’s “SQL in PL/SQL Enhancements” article focused on enhancements for executing SQL from PL/SQL in Oracle Database 12c. For example, if proc1 calls remote procedure remoteproc2, remoteproc2 will not be able to obtain information about proc1 by using UTL_CALL_STACK.

In many applications, however, we work to avoid unhandled exceptions. Name Description BACKTRACE_DEPTH Returns the number of backtrace items in the backtrace BACKTRACE_LINE Returns the line number of the unit at the specified backtrace depth BACKTRACE_UNIT Returns the name of the SQL> BEGIN 2 EXECUTE IMMEDIATE 'garbage'; 3 EXCEPTION 4 WHEN OTHERS THEN 5 DBMS_OUTPUT.PUT_LINE( SQLERRM ); 6 DBMS_OUTPUT.PUT_LINE( DBMS_UTILITY.FORMAT_ERROR_BACKTRACE ); 7 RAISE; 8 END; 9 / ORA-00900: invalid SQL statement ORA-06512: CREATE OR REPLACE PACKAGE test_pkg AS PROCEDURE proc_1; PROCEDURE proc_2; PROCEDURE proc_3; END; / CREATE OR REPLACE PACKAGE BODY test_pkg AS PROCEDURE proc_1 AS BEGIN proc_2; EXCEPTION WHEN OTHERS THEN display_backtrace;

SET SERVEROUTPUT ON EXEC test_pkg.proc_1; ***** Call Stack Start ***** ----- PL/SQL Call Stack ----- object line object handle number name 0xb6d4ac18 4 procedure TEST.DISPLAY_CALL_STACK 0xb6d14298 15 package body TEST.TEST_PKG 0xb6d14298 Traceback Examples¶ This simple example implements a basic read-eval-print loop, similar to (but less useful than) the standard Python interactive interpreter loop. PL/SQL offers a powerful and flexible exception architecture. It will aid greatly in resolving the cause of the error.

Listing 3 shows an example of such an occurrence. traceback.print_exception(etype, value, tb[, limit[, file]])¶ Print exception information and up to limit stack trace entries from the traceback tb to file. Line 14 calls the LEXICAL_DEPTH function to display the depth in the stack of each entry. Take the Challenge Each Oracle Magazine PL/SQL article by Steven Feuerstein offers a quiz to test your knowledge of the information provided in it.

In general it will work only after an exception has reached an interactive prompt (see sys.last_type). Of course, DBMS_OUTPUT.PUT_LINE will raise an exception if you pass it a string that is longer than 255 characters, so I will display the error message using my own enhanced version With the passing of Thai King Bhumibol, are there any customs/etiquette as a traveler I should be aware of? In the above example, the call to DBMS_UTILITY.FORMAT_ERROR_BACKTRACE was from the exception section of the outermost procedure in the stack (p3).

CONCATENATE_SUBPROGRAM then obtains the fully qualified name of that subprogram. SQL> BEGIN 2 DBMS_OUTPUT.put_line ('calling p3'); 3 p3; 4 END; 5 / calling p3 in p3, calling p2 in p2 calling p1 in p1, raising error Error stack from p1: ORA-06512: The quiz appears below and also at the PL/SQL Challenge (plsqlchallenge.com), a website that offers online quizzes on the PL/SQL language as well as SQL, Oracle Application Express, database design, and Line Unit'); DBMS_OUTPUT.put_line('--------- --------- --------------------'); FOR i IN 1 ..

We could easily reverse it to display first to last. -- Procedure to display the call stack. ERROR_DEPTH : The number of errors on the error stack. Cheers, Vijay Posted by Vijayaragavan at 10:55:00 pm Email This BlogThis! Navigation index modules | next | previous | Python » 2.7.12 Documentation » The Python Standard Library » 28.

traceback.format_list(extracted_list)¶ Given a list of tuples as returned by extract_tb() or extract_stack(), return a list of strings ready for printing. The very first step in my info function is to perform a set of INSTR calls to identify the starting and ending locations of the various elements of the string that CREATE OR REPLACE PROCEDURE display_call_stack AS BEGIN DBMS_OUTPUT.put_line('***** Call Stack Start *****'); DBMS_OUTPUT.put_line(DBMS_UTILITY.format_call_stack); DBMS_OUTPUT.put_line('***** Call Stack End *****'); END; / -- Test package to show a nested call. Can Dandelion defeat you?