Using contains in a PLSQL procedure?

Question

This works
select
index_words, ctxsys.score( 1) scr
from
cryo_distinct_index_words2
where
ctxsys.contains(index_words ,'test',1) > 0
order
by ctxsys.score( 1) desc
This does not:
CREATE OR REPLACE PROCEDURE Assign_Catagory2 IS
Cursor select_titles is
select title from cryo_titles
order by title;
t_score number(5);
t_title varchar2(1000);
t_category varchar2(1000);
query_phrase varchar2(1000);
BEGIN
open select_titles;
loop
fetch select_titles into t_title;
exit when select_titles%notfound;
query_phrase := t_title;
for c1 in (select index_words, ctxsys.score(1) scr
from cryo_distinct_index_words2
where ctxsys.contains(index_words,t_title,1) > 0
order by ctxsys.score(1) desc)
loop
insert into cryo_title_category values (t_title, t_category);
end loop;
end loop;
END Assign_Catagory2;
PLS-00320: the declaration of the type of this expression is incomplete or malformed
I've tried to use:
where ctxsys.contains(index_words,''t_title'',1) > 0
or
where ctxsys.contains(index_words,'''||t_title||''',1) > 0
but nothing seems to work.
Any ideas?

Answer 1

If there are any null values in ct.title, that will produce the error. Try adding "and ct.title is not null". Please see the demonstration below. Also, there is another more appropriate discussion group on these forums that is devoted exclusively to text.
scott@ORA92> CREATE TABLE cryo_distinct_index_words2
  2    (INDEX_WORDS VARCHAR2(1000))
  3  /
Table created.
scott@ORA92> INSERT ALL
  2  INTO  cryo_distinct_index_words2 VALUES (NULL)
  3  INTO  cryo_distinct_index_words2 VALUES ('test')
  4  SELECT * FROM DUAL
  5  /
2 rows created.
scott@ORA92> CREATE TABLE cryo_titles
  2    (TITLE         VARCHAR2(1000),
  3       SELECTED    VARCHAR2(1))
  4  /
Table created.
scott@ORA92> INSERT ALL
  2  INTO cryo_titles VALUES (NULL, NULL)
  3  INTO cryo_titles VALUES ('test', NULL)
  4  SELECT * FROM DUAL
  5  /
2 rows created.
scott@ORA92> CREATE TABLE cryo_title_category
  2    (title         VARCHAR2(1000),
  3       category    VARCHAR2(1000),
  4       score         NUMBER)
  5  /
Table created.
scott@ORA92> CREATE INDEX cdiw_iw_idx
  2  ON cryo_distinct_index_words2 (index_words)
  3  INDEXTYPE IS CTXSYS.CONTEXT
  4  /
Index created.
scott@ORA92> -- reproduction of error:
scott@ORA92> insert into cryo_title_category (TITLE, CATEGORY, SCORE)
  2  select title title, index_words index_words, ctxsys.score(1) scr
  3  from   cryo_distinct_index_words2 cdiw, cryo_titles ct
  4  where  ctxsys.contains(cdiw.index_words,ct.title,1) > 0
  5  /
insert into cryo_title_category (TITLE, CATEGORY, SCORE)
ERROR at line 1:
ORA-29902: error in executing ODCIIndexStart() routine
ORA-20000: Oracle Text error:
DRG-50901: text query parser syntax error on line 1, column 1
scott@ORA92> -- correction:
scott@ORA92> insert into cryo_title_category (TITLE, CATEGORY, SCORE)
  2  select title title, index_words index_words, ctxsys.score(1) scr
  3  from   cryo_distinct_index_words2 cdiw, cryo_titles ct
  4  where  ctxsys.contains(cdiw.index_words,ct.title,1) > 0
  5  and    ct.title is not null
  6  /
1 row created.
scott@ORA92> SELECT * FROM cryo_title_category
  2  /
TITLE
CATEGORY
     SCORE
test
test
         4
scott@ORA92>