Difference Between Value Error And Invalid Number In Pl Sql
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sure if I can talk about it or not.One of the chapters is invalid_number exception example on "Exceptions" and I noticed a line from the Oracle documentation invalid_cursor which I didn't notice before. The VALUE_ERROR (ORA-6502) and INVALID_NUMBER (ORA-1722) are predefined exception, which can be invalid number error in oracle handled by name in your exception handler.Quote from the docs:"...In procedural statements, VALUE_ERROR is raised if the conversion of a character string into a number fails. (In SQL
Value_error
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 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'; oracle to_number 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 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
Oracle Defined and User defined Exceptions User Defined:User defined exceptions are defined in many ways.a.New user defined Exceptions can be created using existing Oracle defined Exceptionsb.Entirely new Exceptions can be according to a users need. Eg: Raise an exception if employee salry should not be negative value.There are mainly 3 ways http://nuijten.blogspot.com/2009/02/value-error-and-invalid-number.html to use User Defined ExceptionsA. RAISE EXCEPTIONdeclareexc_user Exception; -declare exception begin -code- exception when others then raise exc_user; -exception raisedexceptionwhen exc_user then-handler for exc_user. exception handledwhen others then-handler for othersend; B. RAISE_APPLICATION_ERRORdeclareexc_user Exception; -declare exception begin if (
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