Pl Sql Error Handling No Data Found
Contents |
errors. The latter are called exceptions. Note: The language of warning and error pl sql exception handling examples messages depends on the NLS_LANGUAGE parameter. For information about this
No Data Found Exception In Oracle
parameter, see Oracle Database Globalization Support Guide. Topics Compile-Time Warnings Overview of Exception Handling Internally Defined
Pl Sql Continue After Exception
Exceptions Predefined Exceptions User-Defined Exceptions Redeclared Predefined Exceptions Raising Exceptions Explicitly Exception Propagation Unhandled Exceptions Error Code and Error Message Retrieval Continuing Execution After Handling Exceptions Retrying
Pl Sql Exception Handling Best Practices
Transactions After Handling Exceptions See Also: "Exception Handling in Triggers" "Handling FORALL Exceptions After FORALL Statement Completes" Tip: If you have problems creating or running PL/SQL code, check the Oracle Database trace files. The USER_DUMP_DEST initialization parameter specifies the current location of the trace files. You can find the value of this parameter user defined exception in pl sql by issuing SHOW PARAMETER USER_DUMP_DEST. For more information about trace files, see Oracle Database Performance Tuning Guide. Compile-Time Warnings While compiling stored PL/SQL units, the PL/SQL compiler generates warnings for conditions that are not serious enough to cause errors and prevent compilation—for example, using a deprecated PL/SQL feature. To see warnings (and errors) generated during compilation, either query the static data dictionary view *_ERRORS (described in Oracle Database Reference) or, in the SQL*Plus environment, use the command SHOW ERRORS. The message code of a PL/SQL warning has the form PLW-nnnnn. For the message codes of all PL/SQL warnings, see Oracle Database Error Messages. Table 11-1 summarizes the categories of warnings. Table 11-1 Compile-Time Warning Categories Category Description Example SEVERE Condition might cause unexpected action or wrong results. Aliasing problems with parameters PERFORMANCE Condition might cause performance problems. Passing a VARCHAR2 value to a NUMBER column in an INSERT statement INFORMATIONAL Condition does not affect performance or correctness,
shot at without result. —Winston Churchill 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 functions for error trapping are contained in which section of a pl/sql block handle certain kinds of errors meaningful to your PL/SQL program. With many programming pl sql exception when others languages, unless you disable error checking, a run-time error such as stack overflow or division by zero stops normal processing pl/sql raises an exception in which two of the following cases 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 https://docs.oracle.com/cd/E11882_01/appdev.112/e25519/errors.htm these topics: Overview of PL/SQL Runtime Error Handling Advantages of PL/SQL Exceptions Summary of 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 Compile-Time Warnings Overview of PL/SQL Runtime Error Handling In PL/SQL, an error condition is called an exception. Exceptions can be https://docs.oracle.com/cd/B13789_01/appdev.101/b10807/07_errs.htm internally defined (by the runtime 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, control returns to the host environment. The following example calculates a price-to-earnings ratio for a company. If the company has zero earnings, the division operation raises the predefined
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more http://stackoverflow.com/questions/221909/oracle-pl-sql-are-no-data-found-exceptions-bad-for-stored-procedure-performanc about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges http://www.java2s.com/Tutorial/Oracle/0480__PL-SQL-Programming/NOdatafound.htm Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Oracle PL/SQL - Are NO_DATA_FOUND Exceptions bad for stored procedure performance? up vote 20 down vote favorite 6 I'm writing a stored procedure that needs to have a lot pl sql of conditioning in it. With the general knowledge from C#.NET coding that exceptions can hurt performance, I've always avoided using them in PL/SQL as well. My conditioning in this stored proc mostly revolves around whether or not a record exists, which I could do one of two ways: SELECT COUNT(*) INTO var WHERE condition; IF var > 0 THEN SELECT NEEDED_FIELD INTO otherVar WHERE condition; .... -or- SELECT NEEDED_FIELD INTO var WHERE condition; EXCEPTION WHEN NO_DATA_FOUND .... pl sql exception The second case seems a bit more elegant to me, because then I can use NEEDED_FIELD, which I would have had to select in the first statement after the condition in the first case. Less code. But if the stored procedure will run faster using the COUNT(*), then I don't mind typing a little more to make up processing speed. Any hints? Am I missing another possibility? EDIT I should have mentioned that this is all already nested in a FOR LOOP. Not sure if this makes a difference with using a cursor, since I don't think I can DECLARE the cursor as a select in the FOR LOOP. sql oracle exception plsql share|improve this question edited Oct 21 '08 at 14:05 asked Oct 21 '08 at 13:37 AJ. 9,1351459115 add a comment| 12 Answers 12 active oldest votes up vote 26 down vote accepted I would not use an explicit cursor to do this. Steve F. no longer advises people to use explicit cursors when an implicit cursor could be used. The method with count(*) is unsafe. If another session deletes the row that met the condition after the line with the count(*), and before the line with the select ... into, the code will throw an exception that will not get handled. The second version from the original post does not have this problem, and it is generally preferr
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 PrivilegeNO data found : Handle Exception«PL SQL Programming«Oracle PL/SQL TutorialOracle PL/SQL TutorialPL SQL ProgrammingHandle ExceptionSQL> SQL> SQL> create table employee ( 2 id number, 3 employee_type_id number, 4 external_id varchar2(30), 5 first_name varchar2(30), 6 middle_name varchar2(30), 7 last_name varchar2(30), 8 name varchar2(100), 9 birth_date date , 10 gender_id number ); Table created. SQL> SQL> SQL> create table gender ( 2 id number, 3 code varchar2(30), 4 description varchar2(80), 5 active_date date default SYSDATE not null, 6 inactive_date date ); Table created. SQL> SQL> SQL> SQL> insert into gender ( id, code, description ) values ( 1, 'F', 'Female' ); 1 row created. SQL> insert into gender ( id, code, description ) values ( 2, 'M', 'Male' ); 1 row created. SQL> insert into gender ( id, code, description ) values ( 3, 'U', 'Unknown' ); 1 row created. SQL> SQL> SQL> SQL> set serveroutput on size 1000000; SQL> SQL> declare 2 3 d_birth_date employee.birth_date%TYPE; 4 n_gender_id employee.gender_id%TYPE; 5 n_selected number := -1; 6 n_id employee.id%TYPE; 7 v_first_name employee.first_name%TYPE; 8 v_last_name employee.last_name%TYPE; 9 v_middle_name employee.middle_name%TYPE; 10 v_name employee.name%TYPE; 11 12 begin 13 v_first_name := 'JOHN'; 14 v_middle_name := 'J.'; 15 v_last_name := 'DOUGH'; 16 v_name := rtrim(v_last_name||', '||v_first_name||' '||v_middle_name); 17 d_birth_date := to_date('19800101', 'YYYYMMDD'); 18 19 begin 20 select id