Home > Pl Sql > Pl Sql Error Handling

Pl Sql Error Handling

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. Example 11-12 Raising User-Defined Exception with RAISE_APPLICATION_ERROR CREATE PROCEDURE account_status ( due_date DATE, today DATE ) AUTHID DEFINER IS BEGIN IF due_date < today THEN -- explicitly raise exception RAISE_APPLICATION_ERROR(-20000, 'Account Copyright © 2003-2016 TechOnTheNet.com. Advertisement About Us Contact Us Testimonials Donate Follow us Home Oracle / PLSQL Exceptions TechOnTheNet.com requires javascript to work properly. this page

HandleAll should be called from all exception handlers where you want the error to be logged. SUBSCRIPT_BEYOND_COUNT 06533 -6533 A program references a nested table or varray element using an index number larger than the number of elements in the collection. They might point out something in the subprogram that produces an undefined result or might create a performance problem. 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 --

All rights reserved. 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. That is, the exception reproduces itself in successive enclosing blocks until a handler is found or there are no more blocks to search.

Databases SQL Oracle / PLSQL SQL Server MySQL MariaDB PostgreSQL SQLite MS Office Excel Access Word Web Development HTML CSS Color Picker Languages C Language More ASCII Table Linux UNIX Java ORA-01001 NO_DATA_FOUND When a SELECT...INTO clause does not return any row from a table. Errors can also arise from problems that are independent of your code—for example, disk storage or memory hardware failure—but your code still must take corrective action. In Example 11-17, when n is zero, the calculation 1/n raises the predefined exception ZERO_DIVIDE, and control transfers to the ZERO_DIVIDE exception handler in the same block.

For example, Example 10-16 is a procedure with unnecessary code that could be removed. 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 If the transaction fails, control transfers to the exception-handling part of the sub-block, and after the exception handler runs, the loop repeats. Revising salary from 20000 to 10000.

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 When an exception is raised, Oracle searches for an appropriate exception handler in the exception section. For more information, see "User-Defined Exceptions". 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

Redeclaring Predefined Exceptions Remember, PL/SQL declares predefined exceptions globally in package STANDARD, so you need not declare them yourself. Consider the following example: EXCEPTION WHEN INVALID_NUMBER THEN INSERT INTO ... -- might raise DUP_VAL_ON_INDEX WHEN DUP_VAL_ON_INDEX THEN ... -- cannot catch the exception END; Branching to or from an Exception So, you need not declare them yourself. Example 10-1 Runtime Error Handling DECLARE stock_price NUMBER := 9.73; net_earnings NUMBER := 0; pe_ratio NUMBER; BEGIN -- Calculation might cause division-by-zero error.

Start with the index at the beginning of the string *; v_Index := 1; /* Loop through the string, finding each newline A newline ends this website PROGRAM_ERROR ORA-06501 Internal PL/SQL error. For Example: Lets consider the product table and order_items table from sql joins to explain user-defined exception. Instead, you must assign their values to local variables, then use the variables in the SQL statement, as shown in the following example: DECLARE err_num NUMBER; err_msg VARCHAR2(100); BEGIN ...

For a workaround, see "Defining Your Own Error Messages: Procedure RAISE_APPLICATION_ERROR". For example, in Example 11-23, after the SELECT INTO statement raises ZERO_DIVIDE and the exception handler handles it, execution cannot continue from the INSERT statement that follows the SELECT INTO statement. Continuing after an Exception Is Raised An exception handler lets you recover from an otherwise fatal error before exiting a block. http://back2cloud.com/pl-sql/pl-sql-script-error-handling.php Passing a positive number to SQLERRM always returns the message user-defined exception unless you pass +100, in which case SQLERRM returns the message no data found.

If the parameter is FALSE (the default), the error replaces all previous errors. PROGRAM_ERROR PL/SQL has an internal problem. In the following example, you call raise_application_error if an employee's salary is missing: CREATE PROCEDURE raise_salary (emp_id NUMBER, amount NUMBER) AS curr_sal NUMBER; BEGIN SELECT sal INTO curr_sal FROM emp WHERE

The technique is: Encase the transaction in a sub-block.

The invoker does not handle the exception, so PL/SQL returns an unhandled exception error to the host environment. When Invalid Cursor Exception Demo CREATE OR REPLACE PROCEDURE invcur_exception IS CURSOR x_cur is SELECT * FROM all_tables; x_rec x_cur%rowtype; BEGIN LOOP -- note the cursor was not opened So, your program cannot open that cursor inside the loop. NOT_LOGGED_ON 01012 -1012 It is raised when a database call is issued without being connected to the database.

into the errors table INSERT INTO errors (module, seq_number, error_stack, call_stack, timestamp) VALUES (p_Module, v_SeqNum, v_ErrorStack, v_CallStack, SYSDATE); /* Unwind the error stack to get Execution of the handler is complete, so the sub-block terminates, and execution continues with the INSERT statement. In that case, we change the value that needs to be unique and continue with the next loop iteration. see here Exceptions can be internally defined (by the run-time system) or user defined.

In Example 10-6, you alert your PL/SQL block to a user-defined exception named out_of_stock. WHEN others THEN exception3-handling-statements END; Example Let us write some simple code to illustrate the concept.