Raise Error Sql Oracle
executable statements ... However, if you exit with an unhandled exception, PL/SQL does not assign values to OUT parameters (unless they are NOCOPY parameters). With DBMS_WARNING subprograms, you can save the current PLSQL_WARNINGS setting, change the setting to compile a particular set of subprograms, and then restore the setting to its original value. Reraising Current Exception with RAISE Statement In an exception handler, you can use the RAISE statement to"reraise" the exception being handled. this contact form
Example 11-18 Exception Raised in Exception Handler is Handled by Invoker CREATE PROCEDURE print_reciprocal (n NUMBER) AUTHID DEFINER IS BEGIN DBMS_OUTPUT.PUT_LINE(1/n); EXCEPTION WHEN ZERO_DIVIDE THEN DBMS_OUTPUT.PUT_LINE('Error:'); DBMS_OUTPUT.PUT_LINE(1/n || ' is undefined'); In the exception-handling part, you can include exception handlers for both specific and unknown errors. SQL> create or replace procedure test_var2 (n_test IN number := 0,3 n_result OUT number)4 as5 begin 6 if n_test > 100 then7 raise_application_error(-20010,'Number Too Large');8 end if;9 n_result := n_test;10 end; RAISE_APPLICATION_ERROR raises an exception but does not handle it.
The exception handler cannot transfer control back to its own block. 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. Because I include a handler for that specific problem, the application does not abort when this code is executed. EXCEPTION WHEN OTHERS THEN -- cannot catch the exception ...
Exception Propagation If an exception is raised in a block that has no exception handler for it, then the exception propagates. Figure 11-1 Exception Does Not Propagate Description of "Figure 11-1 Exception Does Not Propagate" In Figure 11-2, the inner block raises exception B. Because the exception propagates immediately to the host environment, the exception handler does not handle it. Using Exception Handling we can test the code and avoid it from exiting abruptly.
If one set of values raises an unhandled exception, then PL/SQL rolls back all database changes made earlier in the FORALL statement. The outer block handles the exception with an OTHERS exception handler. If ex_name_1 was raised, then statements_1 run. The programmer raises an unnamed, programmer-defined exception.
If either ex_name_2 or ex_name_3 was raised, then statements_2 run. This exception will not, however, be handled by the VALUE_ERROR handler in the anonymous block's exception section. Redeclaring predefined exceptions is error prone because your local declaration overrides the global declaration. For more information about PL/SQL units and compiler parameters, see "PL/SQL Units and Compilation Parameters".
LOGIN_DENIED Your program attempts to log on to Oracle with an invalid username and/or password. Associate the name with the error code of the internally defined exception. A cursor FOR loop automatically opens the cursor to which it refers. An internally defined exception does not have a name unless either PL/SQL gives it one (see "Predefined Exceptions") or you give it one.
The message code of a PL/SQL warning has the form PLW-nnnnn. http://lebloggeek.com/raise-error/raise-error-in-vb-6-0.html After the exception handler runs, control transfers to the host environment. Continuing after an Exception Is Raised An exception handler lets you recover from an otherwise fatal error before exiting a block. See Also: Example 12-13, where a bulk SQL operation continues despite exceptions Retrying Transactions After Handling Exceptions To retry a transaction after handling an exception that it raised, use this technique:
It is easy to overlook a possible error or a place where it might occur, especially if the error is not immediately detectable (for example, bad data might be undetectable until STORAGE_ERROR PL/SQL runs out of memory or memory has been corrupted. Propagation of Exceptions Raised in Exception Handlers An exception raised in an exception handler propagates immediately to the enclosing block (or to the invoker or host environment if there is no http://lebloggeek.com/raise-error/raise-error-vb-net.html INVALID_NUMBER In 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 raised.) This
Passing the value of 'True' adds the error to the current stack, while the default is 'False'. For example: NO_DATA_FOUND and ZERO_DIVIDE are called Named System exceptions. Exceptions can be internally defined (by the run-time system) or user defined.
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
For user-defined exceptions, SQLCODE returns +1 and SQLERRM returns the message: User-Defined Exception. 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. Predefined PL/SQL Exceptions An internal exception is raised implicitly whenever your PL/SQL program violates an Oracle rule or exceeds a system-dependent limit. Answer: The raise_application_error is actually a procedure defined by Oracle that allows the developer to raise an exception and associate an error number and message with the procedure.
BEGIN -- Second sub-block. ... PROGRAM_ERROR PL/SQL has an internal problem. Finally, we tell our procedure what to do when the no_sales exception is encountered by including code in the WHEN clause: WHEN no_sales THEN raise_application_error (-20001,'You must have sales in order his comment is here The default exception will be handled using WHEN others THEN: DECLARE
Recompile procedure: ALTER PROCEDURE unreachable_code COMPILE; Result: SP2-0805: Procedure altered with compilation warnings Show errors: SHOW ERRORS Result: Errors for PROCEDURE UNREACHABLE_CODE: LINE/COL ERROR -------- ----------------------------------------------------------------- 7/5 PLW-06002: Unreachable code DBMS_WARNING You might want to use a FOR or WHILE loop to limit the number of tries. The general syntax to declare unnamed system exception using EXCEPTION_INIT is: DECLARE exception_name EXCEPTION; PRAGMA EXCEPTION_INIT (exception_name, Err_code); BEGIN Execution section EXCEPTION WHEN exception_name THEN handle the exception END; For Example: Here product_id is a primary key in product table and a foreign key in order_items table.
WHEN OTHERS THEN -- optional handler sequence_of_statements3 END; To catch raised exceptions, you write exception handlers. But, according to the scope rules, enclosing blocks cannot reference exceptions declared in a sub-block. Figure 11-3 PL/SQL Returns Unhandled Exception Error to Host Environment Description of "Figure 11-3 PL/SQL Returns Unhandled Exception Error to Host Environment" A user-defined exception can propagate beyond its scope (that If you also want to name your exception, you'll need to use the EXCEPTION_INIT pragma in order to associate the error number to the named exception.
ORA-01476 For Example: Suppose a NO_DATA_FOUND exception is raised in a proc, we can write a code to handle the exception as given below. As the following example shows, use of the OTHERS handler guarantees that no exception will go unhandled: EXCEPTION WHEN ...