Pl Sql On Error Continue
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Pl Sql Exception Handling Examples
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User Defined Exception In Pl Sql
each other. Join them; it only takes a minute: Sign up PL/SQL exception handling: do nothing (ignore exception) up vote 12 down vote favorite 1 This is a question I am asked very frequently. Since I couldn't find
Pl Sql Exception Handling Best Practices
any exact duplicate on stackoverflow, I thought I'd post it as a reference. Question: In PL/SQL, I know how to catch exceptions and execute code when they are caught, and how to propagate them to the calling block. For example, in the following procedure, the NO_DATA_FOUND exception is handled directly, while all other exceptions are raised to the calling block: CREATE OR REPLACE PROCEDURE MY_PROCEDURE() IS BEGIN do_stuff(); EXCEPTION WHEN NO_DATA_FOUND THEN -- Do something handle_exception(); pl sql exception when others WHEN OTHERS THEN -- Propagate exception RAISE; END; But what command should I use to ignore one or all raised exceptions and return execution control back to the calling block? oracle exception plsql exception-handling share|improve this question asked Dec 19 '14 at 13:11 silentsurfer 6691318 add a comment| 1 Answer 1 active oldest votes up vote 21 down vote accepted While I agree that 99% of the time it is bad practice to silently ignore exceptions without at least logging them somewhere, there are specific situations where this is perfectly acceptable. In these situations, NULL is your friend: [...] EXCEPTION WHEN OTHERS THEN NULL; END; Two typical situations where ignoring exceptions might be desirable are: 1) Your code contains a statement which you know will fail occasionally and you don't want this fact to interrupt your program flow. In this case, you should enclose you statement in a nested block, as the following example shows: CREATE OR REPLACE PROCEDURE MY_PROCEDURE() IS l_empoyee_name EMPLOYEES.EMPLOYEE_NAME%TYPE; BEGIN -- Catch potential NO_DATA_FOUND exception and continue BEGIN SELECT EMPLOYEE_NAME INTO l_empoyee_name FROM EMPLOYEES WHERE EMPLOYEE_ID = 12345; EXCEPTION WHEN NO_DATA_FOUND THEN NULL; WHEN OTHERS THEN RAISE; END; do_stuff(); EXCEPTION WHEN OTHERS THEN -- Propagate exception RAISE; END; Note that PL/SQL generally does not allow for the On Error Resume Next type of exception handling known from Visual Basic, where all exceptions are igno
class="underline">COMMIT | ROLLBACK] | CONTINUE [COMMIT | ROLLBACK | NONE]} Performs the specified action (exits SQL*Plus by default) if a SQL command or PL/SQL block generates an error. In iSQL*Plus, performs the specified action (stops the functions for error trapping are contained in which section of a pl/sql block current script by default) and returns focus to the Workspace if a pl/sql raises an exception in which two of the following cases SQL command or PL/SQL block generates an error. Terms [SUCCESS | FAILURE | WARNING | n | variable how can we handle errors in pl sql | :BindVariable] Directs SQL*Plus to perform the specified action as soon as it detects a SQL command or PL/SQL block error (but after printing the error message). SQL*Plus will http://stackoverflow.com/questions/27566867/pl-sql-exception-handling-do-nothing-ignore-exception not exit on a SQL*Plus error. EXIT [SUCCESS | FAILURE | WARNING | n | variable | :BindVariable] Directs SQL*Plus to exit as soon as it detects a SQL command or PL/SQL block error (but after printing the error message). SQL*Plus will not exit on a SQL*Plus error. The EXIT clause of WHENEVER SQLERROR follows the same syntax as https://docs.oracle.com/cd/B19306_01/server.102/b14357/ch12052.htm the EXIT command. See EXIT for more information. CONTINUE Turns off the EXIT option. COMMIT Directs SQL*Plus to execute a COMMIT before exiting or continuing and save pending changes to the database. ROLLBACK Directs SQL*Plus to execute a ROLLBACK before exiting or continuing and abandon pending changes to the database. NONE Directs SQL*Plus to take no action before continuing. Usage The WHENEVER SQLERROR command is triggered by SQL command or PL/SQL block errors, and not by SQL*Plus command errors. Examples The commands in the following script cause iSQL*Plus to stop processing the current script and return focus to the Input area on the Workspace if the SQL UPDATE command fails: The commands in the following script cause SQL*Plus to exit and return the SQL error code if the SQL UPDATE command fails: WHENEVER SQLERROR EXIT SQL.SQLCODE UPDATE EMP_DETAILS_VIEW SET SALARY = SALARY*1.1; The following SQL command error causes iSQL*Plus to stop processing the current script and return focus to the Input area on the Workspace if the SELECT command fails: WHENEVER SQLERROR EXIT SQL.SQLCODE select column_
Churchill Run-time errors arise from design faults, coding mistakes, hardware failures, and many other sources. Although you cannot anticipate all possible errors, you https://docs.oracle.com/cd/A97630_01/appdev.920/a96624/07_errs.htm 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 http://www.java2s.com/Tutorial/Oracle/0480__PL-SQL-Programming/Anexampleshowingcontinuingprogramexecutionafterhandlingexception.htm 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 pl sql in the presence of errors. 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 Propagate Reraising a PL/SQL Exception Handling Raised PL/SQL Exceptions Tips for Handling PL/SQL Errors Overview of PL/SQL Error Handling In PL/SQL, a warning or pl sql exception error condition is called an exception. Exceptions can be internally defined (by the run-time system) or user defined. Examples of internally defined exceptions include division by zero and out of memory. Some common internal exceptions have predefined names, such as ZERO_DIVIDE and STORAGE_ERROR. 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 insufficient_funds 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 RAISE 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,
FunctionsRegular Expressions FunctionsStatistical FunctionsLinear Regression FunctionsPL SQL Data TypesPL SQL StatementsPL SQL OperatorsPL SQL ProgrammingCursorCollectionsFunction Procedure PackagesTriggerSQL PLUS Session EnvironmentSystem Tables Data DictionarySystem PackagesObject OrientedXMLLarge ObjectsTransactionUser PrivilegeAn example showing continuing program execution after handling exception : Handle Exception«PL SQL Programming«Oracle PL/SQL TutorialOracle PL/SQL TutorialPL SQL ProgrammingHandle ExceptionSQL> create table product( 2 product_id number(4) not null, 3 product_description varchar2(20) not null 4 ); Table created. SQL> SQL> insert into product values (1,'Java'); 1 row created. SQL> insert into product values (2,'Oracle'); 1 row created. SQL> insert into product values (3,'C#'); 1 row created. SQL> insert into product values (4,'Javascript'); 1 row created. SQL> insert into product values (5,'Python'); 1 row created. SQL> SQL> SQL> DECLARE 2 v_descr VARCHAR2(20); 3 BEGIN 4 BEGIN 5 SELECT product_description 6 INTO v_descr 7 FROM product 8 WHERE product_id =10; 9 dbms_output.put_line(v_descr); 10 EXCEPTION WHEN NO_DATA_FOUND THEN 11 INSERT INTO product VALUES (10,'Assistant'); 12 COMMIT; 13 END; 14 BEGIN 15 SELECT product_description 16 INTO v_descr 17 FROM product 18 WHERE product_id =1; 19 dbms_output.put_line(v_descr); 20 EXCEPTION WHEN NO_DATA_FOUND THEN 21 dbms_output.put_line('ERR:Invalid Data for Hierarchy'); 22 END; 23 EXCEPTION 24 WHEN OTHERS THEN 25 dbms_output.put_line('ERR:An error occurred with info :'|| 26 TO_CHAR(SQLCODE)||' '||SQLERRM); 27 END; 28 / Java PL/SQL procedure successfully completed. SQL> SQL> SQL> drop table product; Table dropped. SQL> 24.15.Handle Exception24.15.1.Code with No Exception Handler24.15.2.Code with Conditional Control to Avoid an Exception24.15.3.Code with Explicit Handler for Predefined Exception24.15.4.Handling an Unnamed Exception24.15.5.Handling a custom exception24.15.6.An example showing cont