Pl Sql Select Error Handling
Therefore, the RAISE statement and the WHEN clause refer to different exceptions. A problem I see time and time again is that companies invest heavily in coding their business logic into a middle tier layer on an application server. TimesTen reports errors to your application so you can avoid returning unhandled exceptions. Pre-defined Exceptions PL/SQL provides many pre-defined exceptions, which are executed when any database rule is violated by a program. this content
EXCEPTION WHEN OTHERS THEN err_num := SQLCODE; err_msg := SUBSTR(SQLERRM, 1, 100); INSERT INTO errors VALUES (err_num, err_msg); END; The string function SUBSTR ensures that a VALUE_ERROR exception (for truncation) is The functions SQLCODE and SQLERRM are especially useful in the OTHERS exception handler because they tell you which internal exception was raised. That is, the built-in parameter SELF (which is always the first parameter passed to a MEMBER method) is null. Then I reran everything just as in case4, except that the stored procedure was the one with the error trap and unnamed block the one without an error trap.
Pl Sql Exception Handling Examples
STORAGE_ERROR ORA-06500 -6500 PL/SQL ran out of memory or memory was corrupted. ORA-01422 ZERO_DIVIDE When you attempt to divide a number by zero. IF ... Are illegal immigrants more likely to commit crimes?
Example 11-1 Setting Value of PLSQL_WARNINGS Compilation Parameter For the session, enable all warnings—highly recommended during development: ALTER SESSION SET PLSQL_WARNINGS='ENABLE:ALL'; For the session, enable PERFORMANCE warnings: ALTER SESSION SET PLSQL_WARNINGS='ENABLE:PERFORMANCE'; When the sub-block ends, the enclosing block continues to execute at the point where the sub-block ends. END; In this example, if the SELECT INTO statement raises a ZERO_DIVIDE exception, the local handler catches it and sets pe_ratio to zero. Pl/sql Raises An Exception In Which Two Of The Following Cases WHEN OTHERS THEN DBMS_OUTPUT.PUT_LINE('ERROR IS : ' || SQLCODE || ' : ' || SQLERRM); –Mahi_0707 Jun 6 '15 at 21:55 @Mahi007 - SQLERRM already includes SQLCODE.
Redeclaring predefined exceptions is error prone because your local declaration overrides the global declaration. You can avoid unhandled exceptions by coding an OTHERS handler at the topmost level of every PL/SQL program. So, the sub-block cannot reference the global exception unless it was declared in a labeled block, in which case the following syntax is valid: block_label.exception_name The following example illustrates the scope https://docs.oracle.com/cd/E11882_01/timesten.112/e21639/exceptions.htm COLLECTION_IS_NULL ORA-06531 -6531 Program attempted to apply collection methods other than EXISTS to an uninitialized nested table or varray, or program attempted to assign values to the elements of an uninitialized
Scripting on this page enhances content navigation, but does not change the content in any way. Which Of The Following Is Not A Type Of Pl/sql Exception I will elaborate on these points to explain why this approach is so successful. share|improve this answer answered Jul 17 '13 at 18:51 MassuguGo 14218 1 Nice tip! As the following example shows, you would see TimesTen error 8507, then the associated ORA error message. (ORA messages, originally defined for Oracle Database, are similarly implemented by TimesTen.) Command> DECLARE
User Defined Exception In Pl Sql
Would there be no time in a universe with only light? https://www.tutorialspoint.com/plsql/plsql_exceptions.htm In the following example, you pass positive numbers and so get unwanted results: DECLARE err_msg VARCHAR2(100); BEGIN /* Get all Oracle error messages. */ FOR err_num IN 1..9999 LOOP err_msg := Pl Sql Exception Handling Examples RAISE_APPLICATION_ERROR is part of package DBMS_STANDARD, and as with package STANDARD, you do not need to qualify references to it. Functions For Error Trapping Are Contained In Which Section Of A Pl/sql Block The command succeeded.
Also, if a stored subprogram fails with an unhandled exception, PL/SQL does not roll back database work done by the subprogram. http://iipseconline.com/pl-sql/pl-sql-error-handling-sql-code.html For more information about trace files, see Oracle Database Performance Tuning Guide. Your session Use the ALTER SESSION statement, described in Oracle Database SQL Language Reference. RAISE_APPLICATION_ERROR is used for the following reasons, a) to create a unique id for an user-defined exception. Pl Sql Exception Handling Best Practices
Design your programs to work when the database is not in the state you expect. SUBSCRIPT_BEYOND_COUNT Your program references a nested table or varray element using an index number larger than the number of elements in the collection. I suggest you move your logic for handling this exception after the update itself: IF (SQL%ROWCOUNT = 0) THEN dbms_output.put_line ('No more data to update.'); share|improve this answer answered Sep 29 http://iipseconline.com/pl-sql/pl-sql-error-handling-example.html To find the number of X completed, when can I subtract two numbers and when do I have to count?
Avoid unhandled exceptions by including an OTHERS exception handler at the top level of every PL/SQL program. Exception Handling In Oracle 11g How to explain the existence of just one religion? SQLERRM returns the corresponding error message.
The runtime system raises predefined exceptions implicitly (automatically).
END; Handlers in the current block cannot catch the raised exception because an exception raised in a declaration propagates immediately to the enclosing block. Oracle PostersOracle Books Oracle Scripts Ion Excel-DB Don Burleson BlogError Handling in PL/SQL Oracle Tips by Burleson These statements complete execution of the block or subprogram; control does not return to where the exception was raised. How Can We Handle Errors In Pl Sql Non-predefined exceptions include any standard TimesTen errors.
This is also noted in "TimesTen error messages and SQL codes". Put the sub-block inside a LOOP statement. A user-defined exception must be declared and then raised explicitly, using either a RAISE statement or the procedure DBMS_STANDARD.RAISE_APPLICATION_ERROR. http://iipseconline.com/pl-sql/pl-sql-error-handling-loop.html By using the WHEN OTHERS exception handler, or 2.
The usual scoping rules for PL/SQL variables apply, so you can reference local and global variables in an exception handler. EXCEPTION WHEN deadlock_detected THEN ... Example 11-20 Exception Raised in Exception Handler is Not Handled CREATE PROCEDURE descending_reciprocals (n INTEGER) AUTHID DEFINER IS i INTEGER; i_is_one EXCEPTION; BEGIN i := n; LOOP IF i = 1 SET SERVEROUTPUT ON DECLARE l_user_id all_users.username%TYPE := 999999; l_username all_users.username%TYPE; BEGIN SELECT username INTO l_username FROM all_users WHERE user_id = l_user_id; DBMS_OUTPUT.put_line('l_username=' || l_username);
If an error occurs anywhere in the block (including inside a sub-block), then an exception handler handles it. NOT_LOGGED_ON 01012 -1012 It is raised when a database call is issued without being connected to the database. Example 4-4 ttIsql show errors command Again consider Example 2-17. Example 11-5 Naming Internally Defined Exception DECLARE deadlock_detected EXCEPTION; PRAGMA EXCEPTION_INIT(deadlock_detected, -60); BEGIN ...
Example 11-11 Reraising Exception DECLARE salary_too_high EXCEPTION; current_salary NUMBER := 20000; max_salary NUMBER := 10000; erroneous_salary NUMBER; BEGIN BEGIN IF current_salary > max_salary THEN RAISE salary_too_high; -- raise exception END IF; INVALID_CURSOR ORA-01001 -1001 There is an illegal cursor operation. EXCEPTION_INIT will associate a predefined Oracle error number to a programmer_defined exception name. Example 11-4 Locator Variables for Statements that Share Exception Handler CREATE OR REPLACE PROCEDURE loc_var AUTHID DEFINER IS stmt_no POSITIVE; name_ VARCHAR2(100); BEGIN stmt_no := 1; SELECT table_name INTO name_ FROM
For more information, see "User-Defined Exceptions". For example, PL/SQL raises the predefined exception NO_DATA_FOUND if a SELECT INTO statement returns no rows. An exception handler for a named internally defined exception handles that exception whether it is raised implicitly or explicitly. Example 11-9 Declaring, Raising, and Handling User-Defined Exception CREATE PROCEDURE account_status ( due_date DATE, today DATE ) AUTHID DEFINER IS past_due EXCEPTION; -- declare exception BEGIN IF due_date < today THEN
BEGIN Execution section EXCEPTION WHEN NO_DATA_FOUND THEN dbms_output.put_line ('A SELECT...INTO did not return any row.'); END; b) Unnamed System Exceptions Those system exception for which oracle does not provide a name The procedure compiles without warnings. DECLARE default_number NUMBER := 0; i NUMBER := 5; invalid_number EXCEPTION; -- redeclare predefined exception BEGIN INSERT INTO t VALUES(TO_NUMBER('100.00', '9G999')); EXCEPTION WHEN INVALID_NUMBER THEN DBMS_OUTPUT.PUT_LINE('Substituting default value for invalid number.'); INVALID_NUMBER ORA-01722 -1722 Conversion of character string to number failed.
SUBSCRIPT_BEYOND_COUNT ORA-06533 -6533 A program referenced a nested table or varray using an index number larger than the number of elements in the collection.