Align the text of the varchar2 column data

Hello

It is in reference below thread:
Re: Align the text of varchar2

I think I should post my question in this forum, rather than General database,

I created a table and inserted the same that in the thread that above, and when I said:
Select ID, FILLED_TEXT(DESCRIPTION,30) FROM T;

It does not show the data in the column as aligned in 30 word boundaries. I thought, that I would be able to resolve the issue with the help of the http://soft.buaa.edu.cn/oracle/bookshelf/Oreilly/prog2/ch11_02.htm link, but failed.

Kindly help me more.

Kind regards.

Okay, so you're saying there is already a tags in the code to indicate where the line breaks are necessary, so a small adjustment of the data to include these tags and also the code...

DROP TABLE test_data
/
CREATE TABLE test_data as
select 1 as id, q'[For several days after leaving Nantucket, nothing above hatches was seen of Captain Ahab. The mates regularly relieved each other at the watches, and for aught that could be seen to the contrary, they seemed to be the only commanders of the ship; only they sometimes issued from the cabin with orders so sudden and peremptory, that after all it was plain they but commanded vicariously.<>Yes, their supreme lord and dictator was there, though hitherto unseen by any eyes not permitted to penetrate into the now sacred retreat of the cabin.]' as txt from dual union all
select 2, q'[Every time I ascended to the deck from my watches below, I instantly gazed aft to mark if any strange face were visible; for my first vague disquietude touching the unknown captain, now in the seclusion of the sea, became almost a perturbation. This was strangely heightened at times by the ragged Elijah's diabolical incoherences uninvitedly recurring to me, with a subtle energy I could not have before conceived of. But poorly could I withstand them, much as in other moods I was almost ready to smile at the solemn whimsicalities of that outlandish prophet of the wharves.<> But whatever it was of apprehensiveness or uneasiness - to call it so - which I felt, yet whenever I came to look about me in the ship, it seemed against all warrantry to cherish such emotions. For though the harpooneers, with the great body of the crew, were a far more barbaric, heathenish, and motley set than any of the tame merchant-ship companies which my previous experiences had made me acquainted with, still I ascribed this - and rightly ascribed it - to the fierce uniqueness of the very nature of that wild Scandinavian vocation in which I had so abandonedly embarked. But it was especially the aspect of the three chief officers of the ship, the mates, which was most forcibly calculated to allay these colorless misgivings, and induce confidence and cheerfulness in every presentment of the voyage. Three better, more likely sea-officers and men, each in his own different way, could not readily be found, and they were every one of them Americans; a Nantucketer, a Vineyarder, a Cape man. Now, it being Christmas when the ship shot from out her harbor, for a space we had biting Polar weather, though all the time running away from it to the southward; and by every degree and minute of latitude which we sailed, gradually leaving that merciless winter, and all its intolerable weather behind us. It was one of those less lowering, but still grey and gloomy enough mornings of the transition, when with a fair wind the ship was rushing through the water with a vindictive sort of leaping and melancholy rapidity, that as I mounted to the deck at the call of the forenoon watch, so soon as I levelled my glance towards the taffrail, foreboding shivers ran over me. Reality outran apprehension; Captain Ahab stood upon his quarter-deck. End]' from dual
/

CREATE OR REPLACE FUNCTION wordwrap (p_txt IN VARCHAR2, p_linesize IN NUMBER) RETURN t_wordwrap_txt PIPELINED IS
  cursor cur_wordwrap(p_txt in varchar2) is
    select rn, txt
    from (
          select rownum as rn
                ,trim(regexp_substr(p_txt,'.{1,'||p_linesize||'}( |$)',1,rownum)) as txt
          from dual
          connect by rownum <= ceil(length(p_txt)/p_linesize)+10
         )
    where txt is not null
    order by rn;
  v_txt varchar2(4000);
  v_length number := 0;
  v_paratxt varchar2(4000) := p_txt;
  v_paratxt_part varchar2(4000);
  v_pos number;
  v_srch varchar2(100) := '<>';
begin
  loop
    exit when v_paratxt is null;
    v_pos := instr(v_paratxt,v_srch);
    v_paratxt_part := case when v_pos = 0 then v_paratxt else substr(v_paratxt,1,v_pos-1) end;
    v_paratxt := case when v_pos = 0 then null else trim(substr(v_paratxt,v_pos+length(v_srch))) end;
    for w in cur_wordwrap(v_paratxt_part)
    loop
      v_txt := w.txt;
      loop
        exit when length(v_txt) = p_linesize or instr(v_txt,' ') = 0;
        for i in 1..p_linesize-length(v_txt)
        loop
          v_txt := regexp_replace(v_txt,'([^ ]) ','\1  ',1,i);
        end loop;
      end loop;
      v_length := v_length + length(v_txt);
      if length(v_txt) > 0 then
        pipe row(v_txt);
      end if;
    end loop;
    if v_paratxt is not null then
      pipe row(''); -- new line before next part
    end if;
  end loop;
  return;
end;
/

results...

SQL> select test_data.id, x.column_value
  2  from test_data, table(wordwrap(test_data.txt,50)) x
  3  /

        ID COLUMN_VALUE
---------- ---------------------------------------------------
         1 For  several days after leaving Nantucket, nothing
         1 above  hatches was seen of Captain Ahab. The mates
         1 regularly  relieved each other at the watches, and
         1 for aught that could be seen to the contrary, they
         1 seemed to be the only commanders of the ship; only
         1 they  sometimes  issued from the cabin with orders
         1 so  sudden  and  peremptory, that after all it was
         1 plain     they    but    commanded    vicariously.
         1
         1 Yes,  their  supreme  lord and dictator was there,
         1 though  hitherto  unseen by any eyes not permitted
         1 to  penetrate  into  the now sacred retreat of the
         1 cabin.
         2 Every  time I ascended to the deck from my watches
         2 below,  I  instantly  gazed  aft  to  mark  if any
         2 strange  face  were  visible;  for  my first vague
         2 disquietude  touching  the unknown captain, now in
         2 the   seclusion   of  the  sea,  became  almost  a
         2 perturbation.  This  was  strangely  heightened at
         2 times    by   the   ragged   Elijah's   diabolical
         2 incoherences  uninvitedly  recurring to me, with a
         2 subtle  energy  I  could not have before conceived
         2 of.  But poorly could I withstand them, much as in
         2 other  moods  I  was  almost ready to smile at the
         2 solemn  whimsicalities  of that outlandish prophet
         2 of                   the                  wharves.
         2
         2 But   whatever   it  was  of  apprehensiveness  or
         2 uneasiness  -  to  call  it so - which I felt, yet
         2 whenever  I  came to look about me in the ship, it
         2 seemed  against  all  warrantry  to  cherish  such
         2 emotions.  For  though  the  harpooneers, with the
         2 great  body of the crew, were a far more barbaric,
         2 heathenish,  and  motley  set than any of the tame
         2 merchant-ship    companies   which   my   previous
         2 experiences  had  made me acquainted with, still I
         2 ascribed  this  - and rightly ascribed it - to the
         2 fierce  uniqueness of the very nature of that wild
         2 Scandinavian   vocation   in   which   I   had  so
         2 abandonedly  embarked.  But  it was especially the
         2 aspect  of  the  three chief officers of the ship,
         2 the  mates,  which was most forcibly calculated to
         2 allay   these  colorless  misgivings,  and  induce
         2 confidence  and  cheerfulness in every presentment
         2 of   the   voyage.   Three   better,  more  likely
         2 sea-officers  and  men,  each in his own different
         2 way,  could  not  readily  be found, and they were
         2 every  one  of  them  Americans;  a Nantucketer, a
         2 Vineyarder,  a  Cape  man. Now, it being Christmas
         2 when  the  ship  shot  from  out her harbor, for a
         2 space  we had biting Polar weather, though all the
         2 time running away from it to the southward; and by
         2 every  degree  and  minute  of  latitude  which we
         2 sailed,  gradually  leaving that merciless winter,
         2 and  all its intolerable weather behind us. It was
         2 one  of  those  less  lowering, but still grey and
         2 gloomy  enough  mornings  of  the transition, when
         2 with  a fair wind the ship was rushing through the
         2 water  with  a  vindictive  sort  of  leaping  and
         2 melancholy rapidity, that as I mounted to the deck
         2 at  the  call  of the forenoon watch, so soon as I
         2 levelled   my   glance   towards   the   taffrail,
         2 foreboding  shivers  ran  over  me. Reality outran
         2 apprehension;   Captain   Ahab   stood   upon  his
         2 quarter-deck.                                  End

65 rows selected.

SQL>

Tags: Database

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