basic plsql question

[jmaxsherkimer]

i had a basic question on plsql, if i have a variable as varchar2,
containing some text like 'A12345', how do i write a function to make
sure that the first char. is the letter 'A' or 'a' and the next five
characters are numbers? sorry about asking a basic question, but i'm
not the dba here, he recently left and i'm just the web developer
having to do this for now.

[Jim Kennedy]

"jmaxsherkimer" <jm***********@hotmail.com> wrote in message
news:f8**************************@posting.google.c om...

i had a basic question on plsql, if i have a variable as varchar2,
containing some text like 'A12345', how do i write a function to make
sure that the first char. is the letter 'A' or 'a' and the next five
characters are numbers? sorry about asking a basic question, but i'm
not the dba here, he recently left and i'm just the web developer
having to do this for now.

Look in the docs you can find documentation at otn.oracle.com. Look in the
SQL Reference guide. (there are a ton of docs, but that is the one you want)
You will probably use substr and translate. You can test it in sqlplus by
select substr('A12345',1,1) from dual;

etc.
That will allow you to evaluate the expression so you can test your function
quickly. Once you are satisfied with your exprerssion you can put the
expression in your code.
Jim

[Wario]

This function will let you test the format any string up to 50
characters. You may modify is needed.

function word_format (word varchar2) return varchar2 is
fmt varchar2(50);
ltr char(1);
begin
for x in 1..length(word) loop
ltr := substr(word,x,1);
fmt := fmt || case
when ltr between 'A' and 'Z' then 'X'
when ltr between 'a' and 'z' then 'X'
when ltr between '0' and '9' then '9'
else ltr
end;
end loop;

return fmt;
end;
/

if word_format('A54698') = 'X99999' then
.....
end if;

[Wario]

This procedure is better. You could use the translate function alone,
but the string parameters would make your code long and unwieldy.

create function word_fmt (word varchar2) return varchar2 is
begin
return translate(word,
'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVW XYZ0123456789',
'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXX9999999999'
);
end;

if word_fmt('a52132') = 'X99999' then
.....
end if;

or

if translate(word, 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVW XYZ0123456789',
'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXX9999999999') =
'X99999' then
....
end if;

[Pedro Lopes]

You can use regular expressions on 10g.

see the documentation at http://tahiti.oracle.com

bye,
pedro
jmaxsherkimer wrote:

i had a basic question on plsql, if i have a variable as varchar2,
containing some text like 'A12345', how do i write a function to make
sure that the first char. is the letter 'A' or 'a' and the next five
characters are numbers? sorry about asking a basic question, but i'm
not the dba here, he recently left and i'm just the web developer
having to do this for now.

[Alex Filonov]

r0***@insightbb.com (Wario) wrote in message news:<92**************************@posting.google. com>...

This procedure is better. You could use the translate function alone,
but the string parameters would make your code long and unwieldy.

create function word_fmt (word varchar2) return varchar2 is
begin
return translate(word,
'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVW XYZ0123456789',
'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXX9999999999'
);
end;

First character should be 'a' or 'A', other four characters are digits,
so translate function call can look like

translate(word, 'aA0123456789', 'AA9999999999')

if word_fmt('a52132') = 'X99999' then
.....
end if;

or

if translate(word, 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVW XYZ0123456789',
'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXX9999999999') =
'X99999' then
....
end if;