Question

is number function

Asked by: SahirProjects

is there a function in oracle which serves the same functionality as isnumber() in vb6 i.e to find out whether passed parameter is umber or not

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Asked On
2004-03-11 at 02:59:13ID20915177
Tags

oracle

,

number

,

isnumber

,

function

Topic

Oracle Database

Participating Experts
6
Points
125
Comments
11

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Answers

 

by: catchmeifuwantPosted on 2004-03-11 at 03:36:55ID: 10570162

No there's no in-built function.You can use a function & to_number() to check this.

Function Code
----------------
create or replace function fun_number(in_var in varchar2)
return number
is
v_number number;
begin

select to_number(in_var)
into v_number
from dual;

return 0; ---- Number...

exception
when others then
return 1; --- Not a number..

end;
/

------------------------
Output
======


SQL> select fun_number('1234') from dual;

FUN_NUMBER('1234')
------------------
                 0

SQL> select fun_number('12s34') from dual;

FUN_NUMBER('12S34')


-------------------
                  1

SQL>

--

HTH

 

by: morphmanPosted on 2004-03-11 at 03:37:20ID: 10570165

how about this?

  1* select decode(translate('A123456','1234567890','Y'),'Y','Y','N') from dual

D
-
N


  1* select decode(translate('123456','1234567890','Y'),'Y','Y','N') from dual

D
-
Y

 

by: catchmeifuwantPosted on 2004-03-11 at 03:43:57ID: 10570199

short & sweet solution...!!!

 

by: patilyogeshPosted on 2004-03-11 at 04:04:55ID: 10570301

comment from patilyogesh

Solution given by catchmeifuwant  is correct.

 

by: kannankumaraPosted on 2004-03-11 at 04:25:46ID: 10570448

Hi All

You dont even write a select statement... so a cutdown version is...

create or replace function fun_number(in_var in varchar2)
return number
is
v_number number;
begin

begin
  v_number := in_var;
  v_number := 0; ---- Number...
exception
  when value_error then
    v_number := 1; --- Not a number..
end;

return( v_number );

end;
/

Similar question available in ...

http://www.experts-exchange.com/Databases/Oracle/Q_20910341.html

catchmeifuwant gave you this idea first, so deserves point.

Mine is just an enhanced version...

 

by: mandar0Posted on 2004-03-11 at 11:00:41ID: 10574207

One caution:
Do not use TRANSLATE.
  1. In it current form it will not recognize 123.456
  2. If you decide to translate ".", then 123.456.789 will be treated as current number.

Best way to use is kannankumara enhancement.

 

by: gotaluvmePosted on 2004-03-11 at 15:28:45ID: 10576596

How about this function


function is_number(p varchar2) return number is
    v number;
  begin
    v := to_number(p);
    return 1;
  exception when others then return 0;
  end;

 

by: kannankumaraPosted on 2004-03-11 at 15:45:47ID: 10576715

gotaluvme

you dont even need to convert the parameter to number using to_number built-in. Just assign the value to the numeric variable, value_error will be raised if the internal number conversion is not possible. Thats what shown in the function above.

 

by: gotaluvmePosted on 2004-03-12 at 09:07:04ID: 10582268

thank you, i'm learning :-)

20120131-EE-VQP-002

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