This process of “hiding” the way you implement and populate your log will make it easier and more productive to log errors. TIMEOUT_ON_RESOURCE ORA-00051 The activity took too long and timed out. Oracle Country Country Communities I am a... The number that SQLCODE returns is negative unless the Oracle error is no data found, in which case SQLCODE returns +100.
The exception section makes it easy to centralize all your exception handling logic and thereby manage it more effectively. WHEN NO_DATA_FOUND OR DUP_VAL_ON_INDEX THEN Catch any exception: WHEN OTHERS THEN You can have multiple WHEN clauses in your exception section, but if you have a WHEN OTHERS clause, it must Therefore, the values of explicit cursor attributes are not available in the handler. Defining Your Own PL/SQL Exceptions PL/SQL lets you define exceptions of your own. https://www.techonthenet.com/oracle/exceptions/sqlerrm.php
For more information, see "User-Defined Exceptions". END; Handlers in the current block cannot catch the raised exception because an exception raised in a declaration propagates immediately to the enclosing block. Once the exception has been raised, all you can do is handle the exception—or let it “escape” unhandled to the host environment. Oracle Sqlcode List Example 10-1 calculates a price-to-earnings ratio for a company.
Example 11-5 gives the name deadlock_detected to the internally defined exception ORA-00060 (deadlock detected while waiting for resource) and uses the name in an exception handler. Pl Sql Sqlcode The inner block does not have an exception handler for C, so exception C propagates to the outer block. If an error occurs, and that error is handled at any level by the time we're back at the SQL*Plus prompt, we only rollback to the immediate savepoint at the start So, only an OTHERS handler can catch the exception.
However, other user-defined exceptions must be raised explicitly by RAISE statements. Oracle Raise Exception With Message 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. Redeclaring Predefined Exceptions Remember, PL/SQL declares predefined exceptions globally in package STANDARD, so you need not declare them yourself. If earnings are zero, the function DECODE returns a null.
The syntax is: PRAGMA EXCEPTION_INIT (exception_name, error_code) For semantic information, see "EXCEPTION_INIT Pragma". https://docs.oracle.com/cd/E11882_01/appdev.112/e25519/errors.htm All I have to do is make this procedure an autonomous transaction by adding the pragma statement and the COMMIT, as shown in Listing 3. Functions For Error Trapping Are Contained In Which Section Of A Pl/sql Block For example, in the Oracle Precompilers environment, any database changes made by a failed SQL statement or PL/SQL block are rolled back. Oracle Sql Error Codes If I ever need to change the structure of the error_log table, I will have to change all the INSERT statements to accommodate this change.
However, the same scope rules apply to variables and exceptions. In Example 11-15, the VALUE_ERROR exception handler is in the same block as the declaration that raises VALUE_ERROR. You can pass an error number to SQLERRM, in which case SQLERRM returns the message associated with that error number. A runtime error occurs during program execution, however. Oracle Sql Codes List
BEGIN ---------- sub-block begins ... In the following example, you declare an exception named past_due: DECLARE past_due EXCEPTION; Exception and variable declarations are similar. The developer raises the exception explicitly. You could simply record information about an error and then not reraise the exception.
After an exception handler runs, control transfers to the next statement of the enclosing block. Pl Sql Exception Handling Examples If you recompile the subprogram with a CREATE OR REPLACE statement, the current settings for that session are used. Now consider a TimesTen example where the exception is not handled, again run with autocommit disabled: create table mytable (num int not null primary key); set serveroutput on insert into mytable
The inner block raises the exception, and its exception handler does the initial handling and then reraises the exception, passing it to the outer block for further handling. The functions SQLCODE and SQLERRM are especially useful in the OTHERS handler because they return the Oracle error code and message text. statementN; EXCEPTION WHEN OTHERS THEN DBMS_OUTPUT.put_line (SQLCODE); END; When I execute the block, Oracle Database will try to assign the value 100 to l_number. Sqlerror Revising salary from 20000 to 10000.
Unlike variables, exceptions cannot appear in assignment statements or SQL statements. You must raise user-defined exceptions explicitly. All Rights Reserved. Why do neural network researchers care about epochs?
Usually raised by trying to cram a 6 character string into a VARCHAR2(5) variable ZERO_DIVIDE ORA-01476 Not only would your math teacher not let you do it, computers won't either. Redeclaring Predefined Exceptions Remember, PL/SQL declares predefined exceptions globally in package STANDARD, so you need not declare them yourself. INVALID_NUMBER In a SQL statement, the conversion of a character string into a number fails because the string does not represent a valid number. (In procedural statements, VALUE_ERROR is raised.) This Error Code and Error Message Retrieval In an exception handler, for the exception being handled: You can retrieve the error code with the PL/SQL function SQLCODE, described in "SQLCODE Function".
That way you don’t have to rely on your users to give you information such as the error code or the error message. 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 User-defined You can declare your own exceptions in the declarative part of any PL/SQL anonymous block, subprogram, or package. You can read and take the quiz here in Oracle Magazine and then check your answers in the next issue.
I want to... Scope Rules for PL/SQL Exceptions You cannot declare an exception twice in the same block. WHEN OTHERS THEN -- handles all other errors ROLLBACK; END; -- exception handlers and block end here The last example illustrates exception handling, not the effective use of INSERT statements.