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Pl Sql Error Hand
What follows is a re-visiting of some of the tools available in Oracle to help with error logging. You can also catch up on his latest, mostly non-PLSQL rants at http: //feuerthoughts.blogspot.com. Πληροφορίες βιβλιογραφίαςΤίτλοςOracle PL/SQL ProgrammingΣυγγραφείςSteven Feuerstein, Bill PribylΈκδοση4Εκδότης"O'Reilly Media, Inc.", 2005ISBN0596553145, 9780596553142Μέγεθος1200 σελίδες  Εξαγωγή αναφοράςBiBTeXEndNoteRefManΣχετικά με τα Βιβλία Google CREATE or replace procedure ex5b_membership_duration2 is cursor customer_cursor is select customer.customer_id, CUSTOMER.FIRST_NAME, CUSTOMER.LAST_NAME, CUSTOMER.CITY, club_membership.club_id, club_membership.membership_id, round((sysdate - club_membership.MEMBERSHIP_DATE)/365,2) as time_in_club from customer left outer join club_membership on customer.customer_id = club_membership.CUSTOMER_ID; Advantages of PL/SQL Exceptions Using exceptions for error handling has several advantages.
To see any warnings generated during compilation, you use the SQL*Plus SHOW ERRORS command or query the USER_ERRORS data dictionary view. In Example 11-18, when n is zero, the calculation 1/n raises the predefined exception ZERO_DIVIDE, and control transfers to the ZERO_DIVIDE exception handler in the same block. The first is that this function returns up to 2000 characters of the error stack. That is, the exception reproduces itself in successive enclosing blocks until a block has a handler for it or there is no enclosing block (for more information, see "Exception Propagation"). https://docs.oracle.com/cd/B28359_01/appdev.111/b28370/errors.htm
Pl Sql Exception Handling Examples
You cannot use SQLCODE or SQLERRM directly in a SQL statement. Check out past polls. Because this exception is used internally by some SQL functions to signal that they are finished, you should not rely on this exception being propagated if you raise it within a
BEGIN * ERROR at line 1: ORA-01476: divisor is equal to zero ORA-06512: at "HR.DESCENDING_RECIPROCALS", line 19 ORA-06510: PL/SQL: unhandled user-defined exception ORA-06512: at line 2 Example 11-22 is like Example For simplicitys sake in the code block below I am simply outputting the exception code and error message to the console. DBMS_OUTPUT.PUT(dept_rec.DEPARTMENT_ID); DBMS_OUTPUT.PUT_LINE(' ' || dept_rec.LOCATION_ID); EXCEPTION WHEN ROWTYPE_MISMATCH THEN BEGIN DBMS_OUTPUT.PUT_LINE ('Row type mismatch, fetching EMPLOYEES data ...'); FETCH cv INTO emp_rec; DBMS_OUTPUT.PUT(emp_rec.DEPARTMENT_ID); DBMS_OUTPUT.PUT_LINE(' ' || emp_rec.LAST_NAME); END; END; / Result: Pl Sql Exception When Others How to explain the existence of just one religion?
Example 11-26 Retrying Transaction After Handling Exception DROP TABLE results; CREATE TABLE results ( res_name VARCHAR(20), res_answer VARCHAR2(3) ); CREATE UNIQUE INDEX res_name_ix ON results (res_name); INSERT INTO results (res_name, res_answer) Pl Sql Continue After Exception Learn the names and causes of the predefined exceptions. SUBSCRIPT_OUTSIDE_LIMIT 06532 -6532 A program references a nested table or varray element using an index number (-1 for example) that is outside the legal range. Once you know the error code, you can use it with pragma EXCEPTION_INIT and write a handler specifically for that error.
DBI also provides a HandleError attribute which sets an error handler specifically for errors from DBI. Functions For Error Trapping Are Contained In Which Section Of A Pl/sql Block If you know that your database operations might raise specific internally defined exceptions that do not have names, then give them names so that you can write exception handlers specifically for In Example 11-21, the exception-handling part of the procedure has exception handlers for user-defined exception i_is_one and predefined exception ZERO_DIVIDE. Aliasing problems with parameters PERFORMANCE Condition might cause performance problems.
Pl Sql Continue After Exception
SQL> Well, that's different. https://mikesmithers.wordpress.com/2015/07/24/plsql-error-logging-and-quantum-theory/ For more information about PL/SQL compilation parameters, see PL/SQL Units and Compilation Parameters. Pl Sql Exception Handling Examples You can define your own exceptions in the declarative part of any PL/SQL block, subprogram, or package. User Defined Exception In Pl Sql The functions SQLCODE and SQLERRM are especially useful in the OTHERS exception handler because they tell you which internal exception was raised.
Each handler consists of a WHEN clause, which specifies an exception, followed by a sequence of statements to be executed when that exception is raised. Remember, no matter how severe the error is, you want to leave the database in a consistent state and avoid storing any bad data. My code is as followed: DECLARE TYPE lv_student_ID IS TABLE OF NUMBER; BEGIN -- assuming you are trying to find all students who have not yet paid, you can use a In Example 11-6, you alert your PL/SQL block to a user-defined exception named out_of_stock. Pl Sql Exception Handling Best Practices
When the INSERT statement implicitly raises the predefined exception INVALID_NUMBER, the exception handler does not handle it. posted 4 years ago declare CNT number; begin select count(*) into CNT from USER_TABLES where TABLE_NAME = 'whatever'; -- if CNT = 1 then drop table WHATEVER; end if; -- create Example 11-13 Retrying a Transaction After an Exception CREATE TABLE results (res_name VARCHAR(20), res_answer VARCHAR2(3)); CREATE UNIQUE INDEX res_name_ix ON results (res_name); INSERT INTO results VALUES ('SMYTHE', 'YES'); INSERT INTO results Handling Exceptions Raised in Handlers When an exception occurs within an exception handler, that same handler cannot catch the exception.
Table 11-2 PL/SQL Warning Categories Category Description Example SEVERE Condition might cause unexpected action or wrong results. Pl/sql Raises An Exception In Which Two Of The Following Cases A PL/SQL block cannot catch an exception raised by a remote subprogram. ALTER PROCEDURE hello COMPILE PLSQL_WARNINGS='ENABLE:PERFORMANCE'; -- Recompile with extra checking.
Reraising a PL/SQL Exception Sometimes, you want to reraise an exception, that is, handle it locally, then pass it to an enclosing block.
PerlMonks graciously bestowed by Tim Vroom. For general information about PL/SQL compilation parameters, see PL/SQL Units and Compilation Parameters. An exception can be either internally defined (by the run-time system) or user-defined. Raise Application Error Oracle Example User-defined exceptions must be raised explicitly by RAISE statements, which can also raise predefined exceptions.
Movie about a board-game that asks the players touchy questions Bangalore to Tiruvannamalai : Even, asphalt road How much interest did Sauron have in Erebor? Update HandleError (which has been proposed in other answers) is a generalized error trapping system. Remember, amateurs built the ark. If the INSERT succeeds, we exit from the loop immediately.
For details, see "Raising Exceptions Explicitly". Packed with examples and helpful recommendations, the book has helped everyone--from novices to experienced developers, and from Oracle Forms developers to database...https://books.google.gr/books/about/Oracle_PL_SQL_Programming.html?hl=el&id=vUbJkdl6vIcC&utm_source=gb-gplus-shareOracle PL/SQL ProgrammingΗ βιβλιοθήκη μουΒοήθειαΣύνθετη Αναζήτηση ΒιβλίωνΑγορά eBook - 40,80 €Λήψη Expect that at some time, your code will be passed incorrect or null parameters, that your queries will return no rows or more rows than you expect. Blog at WordPress.com.
Errors are especially likely during arithmetic calculations, string manipulation, and database operations. Was Sigmund Freud "deathly afraid" of the number 62? These conditions are not serious enough to produce an error and keep you from compiling a subprogram. For example, the declaration in Example 11-10 raises an exception because the constant credit_limit cannot store numbers larger than 999.
Words that are anagrams of themselves Should I use "teamo" or "skipo"? Has the acronym DNA ever been widely understood to stand for deoxyribose nucleic acid? If you've worked on PL/SQL applications for any length of time, you will almost certainly seen a variation of one of the following in an exception handler : sqlerrm(sqlcode); sqlcode||' : Revising salary from 20000 to 10000.
This is fairly basic stuff. With DBMS_WARNING subprograms, you can save the current PLSQL_WARNINGS setting, change the setting to compile a particular set of subprograms, and then restore the setting to its original value. Example 11-3 Scope of PL/SQL Exceptions DECLARE past_due EXCEPTION; acct_num NUMBER; BEGIN DECLARE ---------- sub-block begins past_due EXCEPTION; -- this declaration prevails acct_num NUMBER; due_date DATE := SYSDATE - 1; todays_date