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Subscript Out of Range (Run time: Error 9)
Subscript Out of Range Error (Run Time: Error 9) occurs when you refer to an object or try to use a variable in a code that doesn’t exist in the code, in that case, VBA will show this error. As every code that you write is unique, so the cause of the error would be.
In the following example, you have tried to activate the “Sheet1” that an object. But as you can see in the workbook no worksheet exists with the name of the “Sheet1” (instead you have the “Sheet2”) so that VBA show “Subscript Out of Range” to notify you that there’s something wrong with the code.
Subscript Out of Range
There could be one more situation when you have to face this error “Subscript Out of Range Error” when you are trying to declare a dynamic array but forget to use the DIM and ReDim statement to redefine the length of the array.
Now in the above code, you have an array with the name of “myArray” and to make it dynamic we have initially left the array length blank. But before you add an item to you need to redefine the array length using the ReDim statement.
And that’s the mistake we have made in the above code and VBA has returned the “Script Out of Range” error.
How Do I Fix Subscript Out of Range in Excel?
The best way to deal with this Subscript Out of Range is to write effective codes and make sure to debug the code that you have written (Step by Step).
When you run a code step by step it is easy for you to know on which line of that code you have an error as VBA will show you the error message for Error 9 and highlight that line with yellow color.
The other thing that you can do is to use an “Error Handler” to jump to a specific line of error when it happens.
In the following code, we have written a line to activate the sheet but before that, we have used the goto statement to move to the error handler. In the error handler, you have a message box that shows you a message with the Err. Description that an error has occurred.
So, when you run this code and the “Sheet1” is not in the workbook where you are trying to activate it. It will show you a message box just like below.
And if the “Sheet1” is there then there won’t be any message at all.
More on VBA Errors
Type Mismatch (Error 13)
10Handling PL/SQL Errors
Run-time errors arise from design faults, coding mistakes, hardware failures, and many other sources. Although you cannot anticipate all possible errors, you can plan to handle certain kinds of errors meaningful to your PL/SQL program.
With many programming languages, unless you disable error checking, a run-time error such as stack overflow or division by zero stops normal processing and returns control to the operating system. With PL/SQL, a mechanism called exception handling lets you bulletproof your program so that it can continue operating in the presence of errors.
This chapter contains these topics:
Overview of PL/SQL Runtime Error Handling
In PL/SQL, an error condition is called an exception. Exceptions can be internally defined (by the runtime system) or user defined. Examples of internally defined exceptions include and . Some common internal exceptions have predefined names, such as and . The other internal exceptions can be given names.
You can define exceptions of your own in the declarative part of any PL/SQL block, subprogram, or package. For example, you might define an exception named to flag overdrawn bank accounts. Unlike internal exceptions, user-defined exceptions must be given names.
When an error occurs, an exception is raised. That is, normal execution stops and control transfers to the exception-handling part of your PL/SQL block or subprogram. Internal exceptions are raised implicitly (automatically) by the run-time system. User-defined exceptions must be raised explicitly by statements, which can also raise predefined exceptions.
To handle raised exceptions, you write separate routines called exception handlers. After an exception handler runs, the current block stops executing and the enclosing block resumes with the next statement. If there is no enclosing block, control returns to the host environment. For information on managing errors when using , see "Handling FORALL Exceptions with the %BULK_EXCEPTIONS Attribute".
Example 10-1 calculates a price-to-earnings ratio for a company. If the company has zero earnings, the division operation raises the predefined exception , the execution of the block is interrupted, and control is transferred to the exception handlers. The optional handler catches all exceptions that the block does not name specifically.
Example 10-1 Runtime Error HandlingDECLARE stock_price NUMBER := 9.73; net_earnings NUMBER := 0; pe_ratio NUMBER; BEGIN -- Calculation might cause division-by-zero error. pe_ratio := stock_price / net_earnings; DBMS_OUTPUT.PUT_LINE('Price/earnings ratio = ' max_salary v_errm); -- Normally we would call another procedure, declared with PRAGMA -- AUTONOMOUS_TRANSACTION, to insert information about errors. INSERT INTO errors VALUES (v_code, v_errm, SYSTIMESTAMP); END; /
The string function ensures that a exception (for truncation) is not raised when you assign the value of to . The functions and are especially useful in the exception handler because they tell you which internal exception was raised.
When using pragma to assert the purity of a stored function, you cannot specify the constraints and if the function calls or .
Catching Unhandled Exceptions
Remember, if it cannot find a handler for a raised exception, PL/SQL returns an unhandled exception error to the host environment, which determines the outcome. For example, in the Oracle Precompilers environment, any database changes made by a failed SQL statement or PL/SQL block are rolled back.
Unhandled exceptions can also affect subprograms. If you exit a subprogram successfully, PL/SQL assigns values to parameters. However, if you exit with an unhandled exception, PL/SQL does not assign values to parameters (unless they are parameters). Also, if a stored subprogram fails with an unhandled exception, PL/SQL does not roll back database work done by the subprogram.
You can avoid unhandled exceptions by coding an handler at the topmost level of every PL/SQL program.
Tips for Handling PL/SQL Errors
In this section, you learn techniques that increase flexibility.
Continuing after an Exception Is Raised
An exception handler lets you recover from an otherwise fatal error before exiting a block. But when the handler completes, the block is terminated. You cannot return to the current block from an exception handler. In the following example, if the statement raises , you cannot resume with the statement:CREATE TABLE employees_temp AS SELECT employee_id, salary, commission_pct FROM employees; DECLARE sal_calc NUMBER(8,2); BEGIN INSERT INTO employees_temp VALUES (301, 2500, 0); SELECT salary / commission_pct INTO sal_calc FROM employees_temp WHERE employee_id = 301; INSERT INTO employees_temp VALUES (302, sal_calc/100, .1); EXCEPTION WHEN ZERO_DIVIDE THEN NULL; END; /
You can still handle an exception for a statement, then continue with the next statement. Place the statement in its own sub-block with its own exception handlers. If an error occurs in the sub-block, a local handler can catch the exception. When the sub-block ends, the enclosing block continues to execute at the point where the sub-block ends, as shown in Example 10-12.
Example 10-12 Continuing After an ExceptionDECLARE sal_calc NUMBER(8,2); BEGIN INSERT INTO employees_temp VALUES (303, 2500, 0); BEGIN -- sub-block begins SELECT salary / commission_pct INTO sal_calc FROM employees_temp WHERE employee_id = 301; EXCEPTION WHEN ZERO_DIVIDE THEN sal_calc := 2500; END; -- sub-block ends INSERT INTO employees_temp VALUES (304, sal_calc/100, .1); EXCEPTION WHEN ZERO_DIVIDE THEN NULL; END; /
In this example, if the statement raises a exception, the local handler catches it and sets to 2500. Execution of the handler is complete, so the sub-block terminates, and execution continues with the statement. See also Example 5-38, "Collection Exceptions".
You can also perform a sequence of DML operations where some might fail, and process the exceptions only after the entire operation is complete, as described in "Handling FORALL Exceptions with the %BULK_EXCEPTIONS Attribute".
Retrying a Transaction
After an exception is raised, rather than abandon your transaction, you might want to retry it. The technique is:
Encase the transaction in a sub-block.
Place the sub-block inside a loop that repeats the transaction.
Before starting the transaction, mark a savepoint. If the transaction succeeds, commit, then exit from the loop. 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.
In Example 10-13, the statement might raise an exception because of a duplicate value in a unique column. In that case, we change the value that needs to be unique and continue with the next loop iteration. If the INSERT succeeds, we exit from the loop immediately. With this technique, you should use a or loop to limit the number of attempts.
Example 10-13 Retrying a Transaction After an ExceptionCREATE TABLE results ( res_name VARCHAR(20), res_answer VARCHAR2(3) ); CREATE UNIQUE INDEX res_name_ix ON results (res_name); INSERT INTO results VALUES ('SMYTHE', 'YES'); INSERT INTO results VALUES ('JONES', 'NO'); DECLARE name VARCHAR2(20) := 'SMYTHE'; answer VARCHAR2(3) := 'NO'; suffix NUMBER := 1; BEGIN FOR i IN 1..5 LOOP -- try 5 times BEGIN -- sub-block begins SAVEPOINT start_transaction; -- mark a savepoint /* Remove rows from a table of survey results. */ DELETE FROM results WHERE res_answer = 'NO'; /* Add a survey respondent's name and answers. */ INSERT INTO results VALUES (name, answer); -- raises DUP_VAL_ON_INDEX if two respondents have the same name COMMIT; EXIT; EXCEPTION WHEN DUP_VAL_ON_INDEX THEN ROLLBACK TO start_transaction; -- undo changes suffix := suffix + 1; -- try to fix problem name := name Object Required (Error 424)