? read from clob and store each line in database

Question

Greetings,
i would like to read LINE BY LINE the contents of a CLOB column( which stores the contents of a plain file .txt)
and store each line into a table.
Is that possible?

Answer 1

pollywog wrote:
with t as (select to_clob('fdsafdsafdafdsaffdsafdsafdsafdsafdafdafdsdsfdsa
fdsafdsafdafdsaffdsafdsafdsafdsafdafdafdsdsfdsa
fdsafdsafdafdsaffdsafdsafdsafdsafdafdafdsdsfdsa
fdsafdsafdafdsaffdsafdsafdsafdsafdafdafdsdsfdsa
fdsafdsafdafdsaffdsafdsafdsafdsafdafdafdsdsfdsa
fdsafdsafdafdsaffdsafdsafdsafdsafdafdafdsdsfdsa
fdsafdsafdafdsaffdsafdsafdsafdsafdafdafdsdsfdsa
fdsafdsafdafdsaffdsafdsafdsafdsafdafdafdsdsfdsa
fdsafdsafdafdsaffdsafdsafdsafdsafdafdafdsdsfdsa
fdsafdsafdafdsaffdsafdsafdsafdsafdafdafdsdsfdsa
fdsafdsafdafdsaffdsafdsafdsafdsafdafdafdsdsfdsa
fdsafdsafdafdsaffdsafdsafdsafdsafdafdafdsdsfdsa
fdsafdsafdafdsaffdsafdsafdsafdsafdafdafdsdsfdsa
fdsafdsafdafdsaffdsafdsafdsafdsafdafdafdsdsfdsa
fdsafdsafdafdsaffdsafdsafdsafdsafdafdafdsdsfdsa
fdsafdsafdafdsaffdsafdsafdsafdsafdafdafdsdsfdsa
fdsafdsafdafdsaffdsafdsafdsafdsafdafdafdsdsfdsa
fdsafdsafdafdsaffdsafdsafdsafdsafdafdafdsdsfdsa
v
fdsafdsafdafdsaffdsafdsafdsafdsafdafdafdsdsfdsa
fdsafdsafdafdsaffdsafdsafdsafdsafdafdafdsdsfdsa
fdsafdsafdafdsaffdsafdsafdsafdsafdafdafdsdsfdsa
fdsafdsafdafdsaffdsafdsafdsafdsafdafdafdsdsfdsa
fdsafdsafdafdsaffdsafdsafdsafdsafdafdafdsdsfdsa
fdsafdsafdafdsaffdsafdsafdsafdsafdafdafdsdsfdsa') x from dual
select
text
from t
model return updated rows
dimension by (0 d)
measures (dbms_lob.substr( x, 4000, 1 ) text, 0 position_of_return )  -- the position of return is where the next carriage return is
rules iterate(100) until position_of_return[iteration_number+1] = 0
position_of_return[iteration_number + 1] = instr(text[0],chr(10),1,iteration_number + 1),
text[iteration_number + 1] = substr(text[0],
position_of_return[iteration_number],
position_of_return[iteration_number + 1] - position_of_return[iteration_number]
Hi;
Thank you for your kind help. The query is very fast. But i would like to ask a question about it. My CLOB contains more than 4000 characters. Is it possible to change the *1* in dbms_lob.substr( x, 4000, *1* ) to start again from where it left.
I did that by making a pipelined function and loop ing until i get to end of clob. But is there a faster way using just sql..
Best Regards
Fatih
FUNCTION get_clob_lines(cl_data CLOB) RETURN t_x_clob_table
PIPELINED IS
yrecords t_x_clob_record;
CURSOR c_lines(n_start_position IN NUMBER) IS
SELECT position_of_return
,text
FROM (SELECT position_of_return
,text
FROM dual model RETURN updated rows
dimension BY(0 d)
measures(dbms_lob.substr(cl_data, 4000, n_start_position) text, 0 position_of_return)
rules iterate(4000) until position_of_return [ iteration_number + 1 ] = 0
(position_of_return [ iteration_number + 1 ] = instr(text [ 0 ], chr(10), 1, iteration_number + 1),
text [ iteration_number + 1 ] = substr(text [ 0 ],
position_of_return [ iteration_number ] + 1, position_of_return [ iteration_number + 1 ] - (position_of_return [ iteration_number ] + 1))
) ccc
WHERE ccc.position_of_return <> 0
ORDER BY ccc.position_of_return;
l_n_max_position NUMBER;
l_n_start_position NUMBER;
BEGIN
l_n_start_position := 1;
WHILE l_n_start_position < dbms_lob.getlength(cl_data) LOOP
FOR r_lines IN c_lines(l_n_start_position) LOOP
yrecords := t_x_clob_record(n_position => r_lines.position_of_return,
v_text => r_lines.text);
l_n_max_position := r_lines.position_of_return;
PIPE ROW(yrecords);
END LOOP;
l_n_start_position := l_n_start_position + l_n_max_position;
END LOOP;
RETURN;
END;