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set serveroutput on; BEGIN insert into test values(1); insert into test values(1); COMMIT; dbms_output.put_line('PRINT SOMETHING 1'); EXCEPTION WHEN OTHERS THEN if sqlcode <> 0 then dbms_output.put_line(SQLCODE || ' ' || SQLERRM); Steven Feuerstein ([email protected]) is Quest Software's PL/SQL evangelist. ALTER PROCEDURE hello COMPILE PLSQL_WARNINGS='ENABLE:PERFORMANCE'; -- Recompile with extra checking. i also used to use raise_exception. http://iipseconline.com/pl-sql/pl-sql-error-handling-procedure.html

This capability was added in Oracle Database 10g Release 2 and is enormously helpful in tracking down the cause of errors. PL/SQL warning messages all use the prefix PLW. If an exception is raised in the declaration section of a block, the exception will propagate to the outer block. Syntax for Procedures The syntax for the WHEN OTHERS clause in a procedure is: CREATE [OR REPLACE] PROCEDURE procedure_name [ (parameter [,parameter]) ] IS [declaration_section] BEGIN executable_section EXCEPTION WHEN exception_name1 THEN

Pl Sql Exception Handling Examples

IF ... Check out the loop in lines 16 through 18: it looks like an infinite loop (it contains no EXIT statement), but, in fact, it will stop when UTL_FILE raises NO_DATA_FOUND. If you ever encounter this scenario, simply reconnect to your schema.

When the sub-block ends, the enclosing block continues to execute at the point where the sub-block ends. Exceptions declared in a block are considered local to that block and global to all its sub-blocks. To reraise an exception, simply place a RAISE statement in the local handler, as shown in the following example: DECLARE out_of_balance EXCEPTION; BEGIN ... Oracle Raise Exception With Message Although you cannot anticipate all possible errors, you can plan to handle certain kinds of errors meaningful to your PL/SQL program.

Following are two important aspects for the EXIT WHEN statement: Until the condition is true, the EXIT-WHEN statement acts like a NULL statement, except for evaluating the condition, and does not Pl Sql Continue After Exception Here are some examples of WHEN clauses: Catch the NO_DATA_FOUND exception, usually raised when a SELECT-INTO statement is executed and finds no rows. You can place RAISE statements for a given exception anywhere within the scope of that exception. WHEN OTHERS THEN -- optional handler sequence_of_statements3 END; To catch raised exceptions, you write exception handlers.

Frequently Asked Questions Question: Is there any way to get the ORA error number (and/or description) for the errors that will fall into OTHERS? Functions For Error Trapping Are Contained In Which Section Of A Pl/sql Block If you want two or more exceptions to execute the same sequence of statements, list the exception names in the WHEN clause, separating them by the keyword OR, as follows: EXCEPTION For example, perhaps a table you query will have columns added or deleted, or their types changed. However, if you exit with an unhandled exception, PL/SQL does not assign values to OUT parameters (unless they are NOCOPY parameters).

Pl Sql Continue After Exception

WHEN OTHERS THEN -- optional handler sequence_of_statements3 END; To catch raised exceptions, you write exception handlers. That way, an exception handler written for the predefined exception can process other errors, as Example 11-7 shows. Pl Sql Exception Handling Examples Something like: WHEN OTHERS THEN 'Error number ' & Err.Number & ' has happened.' Answer: Yes, you can use SQLCODE function to retrieve the error number and SQLERRM function to retrieve Pl Sql Exception Handling Best Practices The user (or the script that is being run) will not know that there was a problem.

The optional OTHERS handler catches all exceptions that the block does not name specifically. For example, PL/SQL raises the predefined exception NO_DATA_FOUND if a SELECT INTO statement returns no rows. Oracle Database provides functions for retrieving these values when you are handling an exception (see Table 1). You might be tempted to simply pass back NULL to indicate "no data found," but that value (or, rather, lack of a value) may sometimes be a legitimate column value. Pl Sql Return

To refer to all warning messages, use the keyword All. DECLARE name VARCHAR2(20); ans1 VARCHAR2(3); ans2 VARCHAR2(3); ans3 VARCHAR2(3); suffix NUMBER := 1; BEGIN ... For example, if you declare an exception named invalid_number and then PL/SQL raises the predefined exception INVALID_NUMBER internally, a handler written for INVALID_NUMBER will not catch the internal exception. have a peek at these guys Also, a GOTO statement cannot branch from an exception handler into the current block.

That lets you refer to any internal exception by name and to write a specific handler for it. Pl/sql Raises An Exception In Which Two Of The Following Cases That lets you refer to any internal exception by name and to write a specific handler for it. So I can now save the new row in my error log, and a later rollback of the business transaction will not wipe out this information.

Make your programs robust enough to work even if the database is not in the state you expect.

Words that are both anagrams and synonyms of each other more hot questions question feed lang-sql about us tour help blog chat data legal privacy policy work here advertising info mobile When an error occurs, an exception is raised. You can write handlers for predefined exceptions using the names in Table 11-1. Pl Sql Stop Execution For example, you might want to roll back a transaction in the current block, then log the error in an enclosing block.

You have to write lots of code to store the error information. INVALID_NUMBER 01722 -1722 n 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 If an exception occurs when you try to initialize a package-level variable, that exception will propagate unhandled out of the package, even if the initialization section contains an exception section. http://iipseconline.com/pl-sql/pl-sql-exit-on-error.html Internal exceptions are raised implicitly (automatically) by the run-time system.

That is, the exception reproduces itself in successive enclosing blocks until a handler is found or there are no more blocks to search. If you redeclare a global exception in a sub-block, the local declaration prevails. Once you know the error code, you can use it with pragma EXCEPTION_INIT and write a handler specifically for that error. Redeclaring predefined exceptions is error prone because your local declaration overrides the global declaration.

Every exception has an error code and an error message associated with it. Home Book List Contents Index MasterIndex Feedback 18/89 11 Handling PL/SQL Errors PL/SQL run-time errors can arise from design faults, coding mistakes, hardware failures, and many other sources. The message begins with the Oracle error code. SELECT ...