Difference Between Value Error Invalid Number Pl Sql
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sure if I can talk about it or not.One of the chapters is on "Exceptions" and I noticed a line from the Oracle documentation which ora-01722 invalid number in oracle I didn't notice before. The VALUE_ERROR (ORA-6502) and INVALID_NUMBER (ORA-1722) are predefined exception, which
01722. 00000 - "invalid Number"
can be handled by name in your exception handler.Quote from the docs:"...In procedural statements, VALUE_ERROR is raised if the conversion of
Convert String To Number In Oracle
a character string into a number fails. (In SQL statements, INVALID_NUMBER is raised.)"Let's first check the latter part, about the SQL statements:SQL> select to_number ('a') 2 from dual 3 /select to_number ('a') *ERROR at
Ora-01722 Invalid Number Solution
line 1:ORA-01722: invalid numberNow let's check the procedural part, in PL/SQL.Based on the description, this statement would cause a VALUE_ERROR exceptionSQL> declare 2 n number; 3 begin 4 n := 'a'; 5 exception 6 when value_error 7 then 8 dbms_output.put_line ('Value Error'); 9 end; 10 /Value ErrorPL/SQL procedure successfully completed....and it does.But what if you would use a SQL statement in PL/SQL?Would this also raise a VALUE_ERROR?SQL> declare ora-01722 invalid number to_char 2 n number; 3 begin 4 select 'a' 5 into n 6 from dual 7 ; 8 exception 9 when value_error 10 then 11 dbms_output.put_line ('Value Error'); 12 end; 13 /Value ErrorPL/SQL procedure successfully completed.Yes, it does. In accordance with the documentation, doing a conversion in procedural statement will raise the VALUE_ERROR exception,... One last option, let's use the first SQL statement from this blog and use it in PL/SQL:SQL> declare 2 n number; 3 begin 4 select to_number('a') 5 into n 6 from dual 7 ; 8 exception 9 when value_error 10 then 11 dbms_output.put_line ('Value Error'); 12 when invalid_number 13 then 14 dbms_output.put_line ('Invalid Number'); 15 end; 16 /Invalid NumberPL/SQL procedure successfully completed.As you can see, it raises the INVALID_NUMBER exception. I expected that it would raise the VALUE_ERROR as well.Tracing the statements reveals the explanation. With the implicit datatype conversion, this is the statement that is executed by the SQL engine (I added some text to the statement to identify the actual statement):SELECT /*+ implicit_conversion */'a' FROM DUAL and with the explicit datatype conversion, this SQL statement gets executedSELECT /*+ explicit_conversion */ TO_NUMBER('a') FROM DUAL Sometimes it's too easy to ignore these little things. I learned something about exceptions again.Link:Oracle Document
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ORA-01722: ora-01722 invalid number to_number invalid number tips Oracle Error Tips by Burleson Consulting Oracle docs offer this information regarding Oracle ORA-01722: invalid number phone ORA-01722 invalid number Cause: The attempted conversion of a character string to a number failed because the character string was not a valid numeric literal. Only numeric fields or character http://nuijten.blogspot.com/2009/02/value-error-and-invalid-number.html fields containing numeric data may be used in arithmetic functions or expressions. Only numeric fields may be added to or subtracted from dates. Action: Check the character strings in the function or expression. Check that they contain only numbers, a sign, a decimal point, and the character "E" or "e" and retry the operation. Jonathan Gennick provides information regarding Oracle ORA-01722 in conjunction http://www.dba-oracle.com/sf_ora_01722_invalid_number.htm with subqueries and Oracle Optimizer. To exhibit how Oracle ORA-01722 is often thrown, this query is given as an example: SELECT * FROM ( SELECT FLAG, TO_NUMBER ( NUM ) NUM FROM SUBTEST WHERE FLAG = 'N' ) WHERE NUM > 0 ; Here, from in the FROM clause of a query, the user is attempting to have a subquery of the original query, which is causing Oracle ORA-01722 to be thrown. The Oracle ORA-01722 error is thrown with the failure because of the outer query. This is because it is trying to test the NUM > 0 condition first because it is assumed it might be more useful. Gennick goes on to show that Oracle ORA-01722 is thrown because the Oracle optimizer has re-written the query as: SELECT FLAG, TO_NUMBER ( NUM ) NUM FROM SUBTEST WHERE TO_NUMBER ( NUM ) > 0 AND FLAG = 'N' ; This throws Oracle ORA-01722 because the re-written query causes the system to convert a non-numeric NUM value of the WHERE clause into numbers. OraFaq also has notes on Oracle ORA-01722. Here, it is explained that Oracle ORA-01722 is thrown becauseto check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that http://www.dbforums.com/showthread.php?1005596-invalid_number-amp-value_error you want to visit from the selection below. Results 1 to 6 of 6 http://www.computerfixersin.com/difference-between-value-error-and-invalid-number-in-pl-sql.php Thread: invalid_number & value_error Tweet Thread Tools Show Printable Version Subscribe to this Thread… Search Thread Advanced Search Display Linear Mode Switch to Hybrid Mode Switch to Threaded Mode 07-26-04,09:59 #1 getmathan View Profile View Forum Posts Registered User Join Date Feb 2004 Location Chennai Posts 53 Unanswered: invalid_number & value_error can anyone tell the invalid number diff between these exceptions invalid_number & value_error think that in procedural stmts we get only value_error, in that case how to differentiate(identify) them Thanks in advance -Mathan For a quick pocket reference of oracle refer http://pocketoracle.blogspot.com/ Reply With Quote 07-26-04,10:36 #2 andrewst View Profile View Forum Posts Visit Homepage Moderator. Join Date Sep 2002 Location UK Posts 5,171 Provided Answers: 1 Luckily for you, Oracle document all these things!! Tony 01722 invalid number Andrews http://tinyurl.com/tonyandrews Reply With Quote 07-26-04,10:56 #3 pinakdb View Profile View Forum Posts Registered User Join Date Feb 2004 Posts 108 Break and learn DECLARE n1 VARCHAR2(1) NOT NULL := 'x' ; BEGIN n1 := 'LongString' ; EXCEPTION WHEN OTHERS THEN dbms_output.put_line(SQLERRM) ; END ; And ... SELECT TO_NUMBER('1234,5678.999') FROM dual; Reply With Quote 07-26-04,12:00 #4 andrewst View Profile View Forum Posts Visit Homepage Moderator. Join Date Sep 2002 Location UK Posts 5,171 Provided Answers: 1 I see what you mean: VALUE_ERROR is raised for both types of error. You can tell which is which by lookign at SQLERRM: Code: SQL> declare 2 x number(2); 3 begin 4 x := 123; 5 exception 6 when value_error then say ('value error: '||sqlerrm); 7 when invalid_number then say ('invalid number: '||sqlerrm); 8 end; 9 / value error: ORA-06502: PL/SQL: numeric or value error: number precision too large PL/SQL procedure successfully completed. SQL> declare 2 x number(2); 3 begin 4 x := 'x'; 5 exception 6 when value_error then say ('value error: '||sqlerrm); 7 when invalid_number then say ('invalid number: '||sqlerrm); 8 end; 9 / value error: ORA-06502: PL/SQL: numeric or value error: character to number conversion error PL/SQL procedure successfully completed. (say is just my shorthand for dbms_output.put_line!) Tony Andrew
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