In the following example, if the SELECT INTO statement raises ZERO_DIVIDE, you cannot resume with the INSERT statement: DECLARE pe_ratio NUMBER(3,1); BEGIN DELETE FROM stats WHERE symbol = 'XYZ'; SELECT price You can avoid unhandled exceptions by coding an OTHERS handler at the topmost level of every PL/SQL program. In the exception-handling part, you can include exception handlers for both specific and unknown errors. For internal exceptions, SQLCODE returns the number of the Oracle error.
Code that can never run By setting the compilation parameter PLSQL_WARNINGS, you can: Enable and disable all warnings, one or more categories of warnings, or specific warnings Treat specific warnings as But remember, an exception is an error condition, not a data item. When invoked, raise_application_error ends the subprogram and returns a user-defined error number and message to the application. To see any warnings generated during compilation, you use the SQL*Plus SHOW ERRORS command or query the USER_ERRORS data dictionary view. https://www.techonthenet.com/oracle/exceptions/sqlerrm.php
Place the statement in its own sub-block with its own exception handlers. Example 11-10 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 You cannot use SQLCODE or SQLERRM directly in a SQL statement.
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 Functions For Error Trapping Are Contained In Which Section Of A Pl/sql Block Code that can never be executed You can also treat particular messages as errors instead of warnings. 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 https://docs.oracle.com/database/121/LNPLS/errors.htm If the company has zero earnings, the division operation raises the predefined exception ZERO_DIVIDE, the execution of the block is interrupted, and control is transferred to the exception handlers.
To retrieve the message associated with the exception, the exception handler in the anonymous block invokes the SQLERRM function, described in "Error Code and Error Message Retrieval". Oracle Sqlcode List DUP_VAL_ON_INDEX Your program attempts to store duplicate values in a database column that is constrained by a unique index. 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 Table 11-3 lists the names and error codes of the predefined exceptions.
To reraise an exception, use a RAISE statement without an exception name, which is allowed only in an exception handler, as in Example 11-9. a fantastic read The technique is: Encase the transaction in a sub-block. Oracle Raise Exception With Message VALUE_ERROR 06502 -6502 An arithmetic, conversion, truncation, or size-constraint error occurs. Pl Sql Exception Handling Examples Some common internal exceptions have predefined names, such as ZERO_DIVIDE and STORAGE_ERROR.
Unlike predefined exceptions, user-defined exceptions must be declared and must be raised explicitly by RAISE statements. Topics Propagation of Exceptions Raised in Declarations Propagation of Exceptions Raised in Exception Handlers Propagation of Exceptions Raised in Declarations An exception raised in a declaration propagates immediately to the enclosing CALL DBMS_WARNING.SET_WARNING_SETTING_STRING('ENABLE:ALL' ,'SESSION'); -- Check the current warning setting. Similar Posts by Content Area: error, ide, PL/SQL, sqldev 6 comments add yours Lanre posted 1 year ago Hey Jeff, How can I view more than 20 errors in SQL Developer? Pl Sql Sqlcode
Table 11-1 Predefined PL/SQL Exceptions Exception Name ORA Error SQLCODE Raised When ... That way, an exception handler written for the predefined exception can process other errors, as Example 11-7 shows. Use error-checking code wherever bad input data can cause an error. For more information, see "User-Defined Exceptions".
Trapping exceptions This section describes how to trap predefined TimesTen errors or user-defined errors. Pl Sql Exception Handling Best Practices If autocommit is enabled and an unhandled exception occurs in TimesTen, the entire transaction is rolled back. If an error occurs in the sub-block, a local handler can catch the exception.
If any other exception was raised, then statements_3 run. WHEN ZERO_DIVIDE THEN -- handles 'division by zero' error dbms_output.put_line('Company must have had zero earnings.'); pe_ratio := null; WHEN OTHERS THEN -- handles all other errors dbms_output.put_line('Some other kind of error CURSOR_ALREADY_OPENED ORA-06511 -6511 Program attempted to open an already opened cursor. Sqlerror To retrieve the associated error message, you can use either the packaged function DBMS_UTILTY.FORMAT_ERROR_STACK or the built-in function SQLERRM.
Example 11-6 Anonymous Block Handles ZERO_DIVIDE DECLARE stock_price NUMBER := 9.73; net_earnings NUMBER := 0; pe_ratio NUMBER; BEGIN pe_ratio := stock_price / net_earnings; -- raises ZERO_DIVIDE exception DBMS_OUTPUT.PUT_LINE('Price/earnings ratio = ' A cursor must be closed before it can be reopened. Can a bike computer be used on the rear wheel? Also, it can use the pragma EXCEPTION_INIT to map specific error numbers returned by RAISE_APPLICATION_ERROR to exceptions of its own, as the following Pro*C example shows: EXEC SQL EXECUTE /* Execute
The optional OTHERS exception handler, which is always the last handler in a block or subprogram, acts as the handler for all exceptions not named specifically. NO_DATA_FOUND A SELECT INTO statement returns no rows, or your program references a deleted element in a nested table or an uninitialized element in an index-by table. Thus, the RAISE statement and the WHEN clause refer to different exceptions. NOT_LOGGED_ON ORA-01012 -1012 Program issued a database call without being connected to the database.
In the following example, you alert your PL/SQL block to a user-defined exception named out_of_stock: DECLARE out_of_stock EXCEPTION; number_on_hand NUMBER(4); BEGIN ... For information about this parameter, see Oracle Database Globalization Support Guide.