CASE 6: Finally ran case where my unnamed block did some ok inserts, I called a proc that did some more ok updates, then I called a proc that did some You must raise user-defined exceptions explicitly. This allows us to create 1000 unique error codes for our logical errors throughout our application. If the transaction fails, control transfers to the exception handler, where you roll back to the savepoint undoing any changes, then try to fix the problem. this page
Commits define the end of a transaction (and start of a new one) - rollbacks only define the end of a transaction if they rollback to the last commit, rather than When the INSERT statement implicitly raises the predefined exception INVALID_NUMBER, the exception handler does not handle it. Tips for Handling PL/SQL Errors In this section, you learn three techniques that increase flexibility. The keyword OTHERS cannot appear in the list of exception names; it must appear by itself. https://docs.oracle.com/cd/A97630_01/appdev.920/a96624/07_errs.htm
Notice how it loses the information of the original error on line 5, so it is vital to store the back trace whenever we catch an exception. DECLARE ---------- sub-block begins past_due EXCEPTION; BEGIN ... Finally, the example recompiles the procedure, and the compiler generates a warning about the unreachable code.
Below that, the unnamed block itself has 'sub' savepoints - one foreach insert/update/delete statement in it, and one for each subprogram unit. You can write handlers for predefined exceptions using the names in the following list: Exception Oracle Error SQLCODE Value ACCESS_INTO_NULL ORA-06530 -6530 CASE_NOT_FOUND ORA-06592 -6592 COLLECTION_IS_NULL ORA-06531 -6531 CURSOR_ALREADY_OPEN ORA-06511 -6511 If there is no enclosing block, control returns to the host environment. Pl/sql Raises An Exception In Which Two Of The Following Cases A SQL statement cannot invoke SQLCODE or SQLERRM.
Example 11-10 Explicitly Raising Predefined Exception DROP TABLE t; CREATE TABLE t (c NUMBER); CREATE PROCEDURE p (n NUMBER) AUTHID DEFINER IS default_number NUMBER := 0; BEGIN IF n < 0 Pl Sql Exception Handling Continue Loop 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. Handling Raised PL/SQL Exceptions When an exception is raised, normal execution of your PL/SQL block or subprogram stops and control transfers to its exception-handling part, which is formatted as follows: EXCEPTION visit The error number and message can be trapped like any Oracle error.
Example 11-3 Single Exception Handler for Multiple Exceptions CREATE OR REPLACE PROCEDURE select_item ( t_column VARCHAR2, t_name VARCHAR2 ) AUTHID DEFINER IS temp VARCHAR2(30); BEGIN temp := t_column; -- For error User Defined Exception In Pl Sql ACCESS_INTO_NULL Your program attempts to assign values to the attributes of an uninitialized (atomically null) object. You need only include an exception-handling part in each block where errors might occur. That way, an exception handler written for the predefined exception can process other errors, as the following example shows: DECLARE acct_type INTEGER := 7; BEGIN IF acct_type NOT IN (1, 2,
These statements complete execution of the block or subprogram; control does not return to where the exception was raised. click COMPILE statement, the current session setting might be used, or the original setting that was stored with the subprogram, depending on whether you include the REUSE SETTINGS clause in the statement. Pl Sql Exception Handling Examples The outer block declares the exception, so the exception name exists in both blocks, and each block has an exception handler specifically for that exception. Pl Sql Exception Handling Best Practices To handle other Oracle errors, you can use the OTHERS handler.
Exception handlers written for the globally declared exception become unable to handle it—unless you qualify its name with the package name STANDARD. this website If the exception handler is in an anonymous block, then control transfers to the host environment (for example, SQL*Plus) If an exception is raised in a block that has no exception This chapter discusses the following topics: Overview of PL/SQL Error Handling Advantages of PL/SQL Exceptions Predefined PL/SQL Exceptions Defining Your Own PL/SQL Exceptions How PL/SQL Exceptions Are Raised How PL/SQL Exceptions In Example 11-3, a procedure uses a single exception handler to handle the predefined exception NO_DATA_FOUND, which can occur in either of two SELECT INTO statements. Functions For Error Trapping Are Contained In Which Section Of A Pl/sql Block
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 BEGIN BEGIN RAISE no_data_found; END; EXCEPTION WHEN no_data_found THEN ... Consider the following example: BEGIN DECLARE ---------- sub-block begins past_due EXCEPTION; due_date DATE := trunc(SYSDATE) - 1; todays_date DATE := trunc(SYSDATE); BEGIN IF due_date < todays_date THEN RAISE past_due; END IF; Get More Info ora_server_error_depth LOOP dbms_output.put_line(ora_server_error_msg(i) ); END LOOP; dbms_output.put_line( '--------------------' ); END e_trigger; / Simple Error Handling Procedure Function To Identify The User Logged Onto Oracle CREATE OR
All Rights Reserved. Pl Sql Exception When Others Internal exceptions are raised implicitly (automatically) by the run-time system. You can avoid problems by declaring scalar variables with %TYPE qualifiers and record variables to hold query results with %ROWTYPE qualifiers.
After an exception handler runs, the current block stops executing and the enclosing block resumes with the next statement. To handle unexpected Oracle errors, you can use the OTHERS handler. But remember, an exception is an error condition, not a data item. How Can We Handle Errors In Pl Sql The error_code is an integer in the range -20000..-20999 and the message is a character string of at most 2048 bytes.
Examples of internally defined exceptions include division by zero and out of memory. The other internal exceptions can be given names. dbms_output.put('Complete Call Stack:'); dbms_output.put(' Object Handle Line Number Object Name'); dbms_output.put_line(' ------------- ----------- -----------'); FOR v_CallRec in c_CallCur LOOP dbms_output.put(RPAD(' ' || v_CallRec.object_handle, 15)); dbms_output.put(RPAD(' see here Examples of internally defined exceptions are ORA-00060 (deadlock detected while waiting for resource) and ORA-27102 (out of memory).
Examples of bad input data are incorrect or null actual parameters and queries that return no rows or more rows than you expect. This program asks for a customer ID, when the user enters an invalid ID, the exception invalid_id is raised. The following example calculates a price-to-earnings ratio for a company. Although you cannot anticipate all possible errors, you can plan to handle certain kinds of errors meaningful to your PL/SQL program.
The ORA-06512 is merely telling us the line number. Again, the unnamed block seems to set an invisible savepoint. Leave a response Cancel Reply → * Required * Required Notify me of followup comments via e-mail. TIMEOUT_ON_RESOURCE ORA-00051 The activity took too long and timed out.
Your session Use the ALTER SESSION statement, described in Oracle Database SQL Language Reference. Table 11-2 Exception Categories Category Definer Has Error Code Has Name Raised Implicitly Raised Explicitly Internally defined Runtime system Always Only if you assign one Yes OptionallyFoot1 Predefined Runtime system Always