Home > Pl Sql > Pl Sql Exit Procedure Error

Pl Sql Exit Procedure Error

Contents

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. Because a block can reference only local or global exceptions, enclosing blocks cannot reference exceptions declared in a sub-block. In general, you should log the error, along with any application-specific information that will help you understand what caused it. That way, an exception handler written for the predefined exception can process other errors, as Example 11-7 shows. this page

IF ... unless you used the pragma EXCEPTION_INIT to associate the exception name with an Oracle error number, in which case SQLCODE returns that error number and SQLERRM returns the corresponding error message. The line on which the error occurred. Continuing after an Exception Is Raised An exception handler lets you recover from an otherwise fatal error before exiting a block. http://stackoverflow.com/questions/891458/abort-a-pl-sql-program

Pl Sql Exception Handling Examples

Write out debugging information in your exception handlers. Llewellyn suggests that we group all exceptions into three categories: deliberate, unfortunate , and unexpected. Second, in the revised valerr package (in Listing 2), my variable (g_name) is declared on line 3 but its value isn't assigned until line 15. That way, you can report errors to your application and avoid returning unhandled exceptions.

If you exit a subprogram successfully, PL/SQL assigns values to OUT parameters. END; The enclosing block does not handle the raised exception because the declaration of past_due in the sub-block prevails. Thus, the RAISE statement and the WHEN clause refer to different exceptions. Oracle Raise Exception With Message Because that is not the norm, this logic is often overlooked.

Unlike predefined exceptions, user-defined exceptions must be declared and must be raised explicitly by RAISE statements. For example, you might want to roll back a transaction in the current block, then log the error in an enclosing block. If the exception is not caught by the exception section or there is no exception section, that exception will propagate out of that block to the enclosing block; it will be https://docs.oracle.com/cd/B13789_01/appdev.101/b10807/07_errs.htm Code Listing 2: Initialization section calling the initialize procedure 1 PACKAGE BODY valerr 2 IS 3 g_name VARCHAR2 (1); 4 5 FUNCTION little_name 6 RETURN VARCHAR2 7 IS 8 BEGIN

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, Functions For Error Trapping Are Contained In Which Section Of A Pl/sql Block Using DBMS_WARNING Package If you are writing PL/SQL subprograms in a development environment that compiles them, you can control PL/SQL warning messages by invoking subprograms in the DBMS_WARNING package. absolutely nothing). The functions SQLCODE and SQLERRM are especially useful in the OTHERS exception handler because they tell you which internal exception was raised.

Pl Sql Continue After Exception

You can have any number of exception handlers, and each handler can associate a list of exceptions with a sequence of statements. http://www.oracle.com/technetwork/issue-archive/2008/08-jul/o48plsql-101224.html A predefined exception is an internally defined exception that is assigned a name by PL/SQL. Pl Sql Exception Handling Examples But remember, an exception is an error condition, not a data item. Pl Sql Exception Handling Best Practices Notify me of new posts via email.

To handle raised exceptions, you write separate routines called exception handlers. Declaring PL/SQL Exceptions Exceptions can be declared only in the declarative part of a PL/SQL block, subprogram, or package. That way, you can report errors to your application and avoid returning unhandled exceptions. If you are RAISE ing exeptions in nested blocks then beware of a race condition. Pl Sql Return

Suppose something’s gone wrong in your application and an exception was raised. Again, a single exception handler can trap all division-by-zero errors, bad array subscripts, and so on. In the following example, you declare an exception named past_due: DECLARE past_due EXCEPTION; Exception and variable declarations are similar. http://back2cloud.com/pl-sql/pl-sql-exit-with-error.php You can suppress or display groups of similar warnings during compilation.

EXCEPTION WHEN OTHERS THEN err_num := SQLCODE; err_msg := SUBSTR(SQLERRM, 1, 100); INSERT INTO errors VALUES (err_num, err_msg); END; The string function SUBSTR ensures that a VALUE_ERROR exception (for truncation) is Pl/sql Raises An Exception In Which Two Of The Following Cases Within this handler, you can invoke the functions SQLCODE and SQLERRM to return the Oracle Database error code and message text. If the transaction succeeds, commit, then exit from the loop.

Once you know the error code, you can use it with pragma EXCEPTION_INIT and write a handler specifically for that error.

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. In procedural statements, VALUE_ERROR is raised if the conversion of a character string into a number fails. (In SQL statements, INVALID_NUMBER is raised.) ZERO_DIVIDE 01476 -1476 A program attempts to divide She has decided to use -1 to indicate that the department was not found. Pl Sql Stop Execution Though they share the same name, the two past_due exceptions are different, just as the two acct_num variables share the same name but are different variables.

You might store such information in a separate table. Let's explore this issue. You declare an exception by introducing its name, followed by the keyword EXCEPTION. http://back2cloud.com/pl-sql/pl-sql-exit-on-error.php Associating a PL/SQL Exception with a Number (EXCEPTION_INIT Pragma) To handle error conditions (typically ORA-n messages) that have no predefined name, you must use the OTHERS handler or the pragma EXCEPTION_INIT.

SQLCODE Note: You cannot call this function inside a SQL statement. How do I find a research assistant positions (life science) in USA if you're an international student and outside of USA now? To invoke RAISE_APPLICATION_ERROR, use the following syntax: raise_application_error( error_number, message[, {TRUE | FALSE}]); where error_number is a negative integer in the range -20000..-20999 and message is a character string DUP_VAL_ON_INDEX Your program attempts to store duplicate values in a database column that is constrained by a unique index.

In procedural statements, VALUE_ERROR is raised if the conversion of a character string into a number fails. (In SQL statements, INVALID_NUMBER is raised.) ZERO_DIVIDE A program attempts to divide The built-in parameter SELF points to the object, and is always the first parameter passed to a MEMBER method. STORAGE_ERROR PL/SQL runs out of memory or memory has been Scope Rules for PL/SQL Exceptions You cannot declare an exception twice in the same block. If you use RAISE in an executable section, you must specify the exception you are raising, as in RAISE NO_DATA_FOUND; But inside an exception handler, you can also use RAISE

Do I have to sacrifice this readability for improved error handling? THEN -- handle the error WHEN OTHERS THEN -- handle all other errors END; If you want two or more exceptions to execute the same sequence of statements, list the exception With exceptions, you can reliably handle potential errors from many statements with a single exception handler, as in Example 11-2. If an exception is raised in the declaration section of your block, that exception will propagate out of the block unhandled.

You can place RAISE statements for a given exception anywhere within the scope of that exception. For example, the declaration in Example 11-10 raises an exception because the constant credit_limit cannot store numbers larger than 999. In other words, the exception section of a block can catch only exceptions raised in the executable section of the block. This entry was posted in Oracle, PL/SQL and tagged PL/SQL procedure, RETURN by mikesmithers.

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. This process of “hiding” the way you implement and populate your log will make it easier and more productive to log errors. select dbms_warning.get_warning_setting_string() from dual; -- When we recompile the procedure, we will see a warning about the dead code. I want to...