So, only an OTHERS handler can catch the exception. If the optional third parameter is TRUE, the error is placed on the stack of previous errors. VALUE_ERROR An arithmetic, conversion, truncation, or size-constraint error occurs. Because the exception propagates immediately to the host environment, the exception handler does not handle it. http://back2cloud.com/pl-sql/pl-sql-error-exception-handling.php
ORA-06511 INVALID_CURSOR When you perform an invalid operation on a cursor like closing a cursor, fetch data from a cursor that is not opened. Here you can list down as many as exceptions you want to handle. Example 11-17 Exception Raised in Exception Handler is Not Handled CREATE PROCEDURE print_reciprocal (n NUMBER) AUTHID DEFINER IS BEGIN DBMS_OUTPUT.PUT_LINE(1/n); -- handled EXCEPTION WHEN ZERO_DIVIDE THEN DBMS_OUTPUT.PUT_LINE('Error:'); DBMS_OUTPUT.PUT_LINE(1/n || ' is Place the sub-block inside a loop that repeats the transaction. https://docs.oracle.com/cd/A97630_01/appdev.920/a96624/07_errs.htm
For more information, see "User-Defined Exceptions". END; Normally, this is not a problem. For example, an exception-handling part could have this syntax: EXCEPTION WHEN ex_name_1 THEN statements_1 -- Exception handler WHEN ex_name_2 OR ex_name_3 THEN statements_2 -- Exception handler WHEN OTHERS THEN statements_3 --
SELF_IS_NULL A program attempts to call a MEMBER method, but the instance of the object type has not been initialized. 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. EXCEPTION WHEN NO_DATA_FOUND THEN ... -- Which SELECT statement caused the error? Functions For Error Trapping Are Contained In Which Section Of A Pl/sql Block Make the last statement in the OTHERS exception handler either RAISE or an invocation of the RAISE_APPLICATION_ERROR procedure. (If you do not follow this practice, and PL/SQL warnings are enabled, then
Design your programs to work when the database is not in the state you expect. How Can A User Defined Exception Be Raised WHEN OTHERS THEN -- optional handler sequence_of_statements3 END; To catch raised exceptions, you write exception handlers. STORAGE_ERROR ORA-06500 A hardware problem: Either RAM or disk drive. https://docs.oracle.com/cd/E11882_01/appdev.112/e25519/errors.htm Associate the name with the error code of the internally defined exception.
You can also assign a number and description to the exception using RAISE_APPLICATION_ERROR. Pl/sql Raises An Exception In Which Two Of The Following Cases In that case, we change the value that needs to be unique and continue with the next loop iteration. For user-defined exceptions, SQLCODE returns +1 and SQLERRM returns the message: User-Defined Exception. Exception handlers written for the globally declared exception become unable to handle it—unless you qualify its name with the package name STANDARD.
For each exception handler, carefully decide whether to have it commit the transaction, roll it back, or let it continue. Raise the user-defined exception based on a specific business rule in the execution section. 3. Pl Sql Exception Handling Examples Thus, the RAISE statement and the WHEN clause refer to different exceptions. Pl Sql Exception Handling Continue Loop DECLARE huge_quantity EXCEPTION; CURSOR product_quantity is SELECT p.product_name as name, sum(o.total_units) as units FROM order_tems o, product p WHERE o.product_id = p.product_id; quantity order_tems.total_units%type; up_limit CONSTANT order_tems.total_units%type := 20; message VARCHAR2(50);
WHEN others THEN exception3-handling-statements END; Example Let us write some simple code to illustrate the concept. this website END; Omitting the exception name in a RAISE statement--allowed only in an exception handler--reraises the current exception. You can also perform a sequence of DML operations where some might fail, and process the exceptions only after the entire operation is complete, as described in "Handling FORALL Exceptions with The number that SQLCODE returns is negative unless the Oracle error is no data found, in which case SQLCODE returns +100. Pl Sql Exception Handling Best Practices
The inner block does not have an exception handler for C, so exception C propagates to the outer block. Oracle provides many predefined exceptions in the STANDARD package. dbms_output.put_line(TO_CHAR(v_TimeStamp, 'DD-MON-YY HH24:MI:SS')); dbms_output.put(' Module: ' || p_Module); dbms_output.put(' Error #' || p_SeqNum || ': '); dbms_output.put_line(v_ErrorMsg); -- Output the call stack. Get More Info If there are nested PL/SQL blocks like this.
The built-in parameter SELF points to the object, and is always the first parameter passed to a MEMBER method. STORAGE_ERROR PL/SQL runs out of memory or memory has been Exception Part Can Be Defined Twice In Same Block Recompile procedure: ALTER PROCEDURE unreachable_code COMPILE; Result: SP2-0805: Procedure altered with compilation warnings Show errors: SHOW ERRORS Result: Errors for PROCEDURE UNREACHABLE_CODE: LINE/COL ERROR -------- ----------------------------------------------------------------- 7/5 PLW-06002: Unreachable code DBMS_WARNING For example, the following declaration raises an exception because the constant credit_limit cannot store numbers larger than 999: DECLARE credit_limit CONSTANT NUMBER(3) := 5000; -- raises an exception BEGIN ...
Example 11-2 uses an ALTER SESSION statement to disable all warning messages for the session and then compiles a procedure that has unreachable code. CASE_NOT_FOUND ORA-06592 None of the choices in the WHEN clauses of a CASE statement is selected and there is no ELSE clause. You can also perform a sequence of DML operations where some might fail, and process the exceptions only after the entire operation is complete, as described in "Handling FORALL Exceptions with In Which Section Are Exception Raised After an exception handler runs, the current block stops executing and the enclosing block resumes with the next statement.
Therefore, the RAISE statement and the WHEN clause refer to different exceptions. If earnings are zero, the function DECODE returns a null. ROWTYPE_MISMATCH The host cursor variable and PL/SQL cursor variable involved in an assignment have incompatible return types. see here THEN -- handle the error WHEN ...
Everything got rolled back. However, an exception name can appear only once in the exception-handling part of a PL/SQL block or subprogram.