Home > Pl Sql > Pl Sql Error Handling Examples

Pl Sql Error Handling Examples


IF number_on_hand < 1 THEN RAISE out_of_stock; END IF; EXCEPTION WHEN out_of_stock THEN -- handle the error END; You can also raise a predefined exception explicitly. But, according to the scope rules, enclosing blocks cannot reference exceptions declared in a sub-block. When an error occurs, an exception is raised. THEN RAISE past_due; -- this is not handled END IF; END; ------------- sub-block ends EXCEPTION WHEN past_due THEN -- does not handle RAISEd exception ... http://setiweb.org/pl-sql/pl-sql-error-handling.php

Exceptions cannot propagate across remote procedure calls done through database links. PL/SQL procedure successfully completed. You cannot use SQLCODE or SQLERRM directly in a SQL statement. You can avoid unhandled exceptions by coding an OTHERS handler at the topmost level of every PL/SQL program. https://docs.oracle.com/cd/A97630_01/appdev.920/a96624/07_errs.htm

Pl Sql Exception Handling Examples

With exceptions, you can handle errors conveniently without the need to code multiple checks, as follows: BEGIN SELECT ... Place the sub-block inside a loop that repeats the transaction. The built-in parameter SELF points to the object, and is always the first parameter passed to a MEMBER method.

DECLARE name VARCHAR2(20); ans1 VARCHAR2(3); ans2 VARCHAR2(3); ans3 VARCHAR2(3); suffix NUMBER := 1; BEGIN ... TIMEOUT_ON_RESOURCE A time-out occurs while Oracle is waiting for a resource. To call RAISE_APPLICATION_ERROR, use the syntax raise_application_error(error_number, message[, {TRUE | FALSE}]); where error_number is a negative integer in the range -20000 .. -20999 and message is a character string up to User Defined Exception In Pl Sql You code the pragma EXCEPTION_INIT in the declarative part of a PL/SQL block, subprogram, or package using the syntax PRAGMA EXCEPTION_INIT(exception_name, -Oracle_error_number); where exception_name is the name of a previously declared

PL/SQL declares predefined exceptions globally in package STANDARD, which defines the PL/SQL environment. Pl Sql Exception Handling Continue Loop 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. Oracle technology is changing and we strive to update our BC Oracle support information. https://docs.oracle.com/cd/E11882_01/appdev.112/e25519/errors.htm Internal exceptions are raised implicitly (automatically) by the run-time system.

That way, you can report errors to your application and avoid returning unhandled exceptions. Pl/sql Raises An Exception In Which Two Of The Following Cases You can have a single exception handler for all division-by-zero errors, bad array indexes, and so on. If none of the blocks handle the exception the program ends abruptly with an error. 3) Types of Exception. Again, the unnamed block seems to set an invisible savepoint.

Pl Sql Exception Handling Continue Loop

LOOP -- could be FOR i IN 1..10 LOOP to allow ten tries BEGIN -- sub-block begins SAVEPOINT start_transaction; -- mark a savepoint /* Remove rows from a table of survey https://www.tutorialspoint.com/plsql/plsql_exceptions.htm 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 -- Pl Sql Exception Handling Examples LOOP -- could be FOR i IN 1..10 LOOP to allow ten tries BEGIN -- sub-block begins SAVEPOINT start_transaction; -- mark a savepoint /* Remove rows from a table of survey Pl Sql Exception Handling Best Practices The other internal exceptions can be given names.

That lets you refer to any internal exception by name and to write a specific handler for it. get redirected here That is, the built-in parameter SELF (which is always the first parameter passed to a MEMBER method) is null. If the company has zero earnings, the predefined exception ZERO_DIVIDE is raised. If earnings are zero, the function DECODE returns a null. Functions For Error Trapping Are Contained In Which Section Of A Pl/sql Block

It also shows how to return the username associated with a specific user_id value. Example 11-1 shows several ALTER statements that set the value of PLSQL_WARNINGS. We can provide a name to this exception and handle it in the exception section as given below. http://setiweb.org/pl-sql/pl-sql-error-handling-example.php After the exception handler runs, control transfers to the host environment.

With some better error checking, we could have avoided the exception entirely, by substituting a null for the answer if the denominator was zero: DECLARE stock_price NUMBER := 9.73; net_earnings NUMBER Pl Sql Exception When Others The usual scoping rules for PL/SQL variables apply, so you can reference local and global variables in an exception handler. COLLECTION_IS_NULL ORA-06531 Attempt to apply collection methods other than EXISTS to an uninitialized (NULL) PL/SQL table or VARRAY.

Example 11-19 is like Example 11-17 except that an enclosing block handles the exception that the exception handler in the inner block raises.

An application can call raise_application_error only from an executing stored subprogram (or method). In such cases, you must use dot notation to specify the predefined exception, as follows: EXCEPTION WHEN invalid_number OR STANDARD.INVALID_NUMBER THEN -- handle the error END; How PL/SQL Exceptions Are Raised With PL/SQL, a mechanism called exception handling lets you "bulletproof" your program so that it can continue operating in the presence of errors. How Can We Handle Errors In Pl Sql Retrieving the Error Code and Error Message: SQLCODE and SQLERRM In an exception handler, you can use the built-in functions SQLCODE and SQLERRM to find out which error occurred and to

These statements complete execution of the block or subprogram; control does not return to where the exception was raised. Exceptions also improve reliability. The following example calculates a price-to-earnings ratio for a company. http://setiweb.org/pl-sql/pl-sql-best-practices-error-handling.php DUP_VAL_ON_INDEX 00001 -1 It is raised when duplicate values are attempted to be stored in a column with unique index.

Enclosing block: Row inserted. Therefore, the RAISE statement and the WHEN clause refer to different exceptions. EXCEPTION WHEN NO_DATA_FOUND THEN ... -- Which SELECT statement caused the error?