Replace of characters with storeb prozedure

Question

Hi,
I want to write a stored prozedure that has as source and target a varchars2 field.
What I want wo do is like the follwing:
source:a, k, ch, c
target:d, o, v, ie
Word example:
source: jed
target: and
The text of the source field has to be analysed and transformed not only letter by letter, because some combinations have two letters like the example with ch.
Thanks for help,
Walter

Answer 1

Hi,
Why not have a lookup table with source, target and a sequence to know the order to replace. Because of you need to replace ch and c, you need to know the first to be replace, is ch or c ? The result is not the same.
SQL> select * from replace;
SO TA        SEQ
a  d           1
k  o           2
ch v 3
c ie 4
j  a           5
e  n           6
d  d           7
7 rows selected.
SQL> create or replace function freplace(wstring varchar2)
  2  return varchar2
  3  as
  4  w_string varchar2(4000):=wstring;
  5  begin
  6  for x in (select * from replace order by seq) loop
  7      w_string := replace(w_string,x.source,x.target);
  8  end loop;
  9  return w_string;
10  end;
11  /
Function created.
SQL> select freplace('School') School, freplace('jed') jed from dual;
SCHOOL   JED
Svool         and
SQL> truncate table replace;
Table truncated.
SQL> insert into replace values ('a','d',1);
1 row created.
SQL> insert into replace values ('k','o',2);
1 row created.
SQL> insert into replace values ('c','ie',3);
1 row created.
SQL> insert into replace values ('ch','v',4);
1 row created.
SQL> select * from replace;
SO TA        SEQ
a  d           1
k  o           2
c ie 3
ch v 4
SQL> select freplace('School') from dual;
FREPLACE('SCHOOL')
SiehoolNicolas.
Message was edited by:
N. Gasparotto