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rem -----------------------------------------------------------------------
rem URL: http://www.orafaq.com/scripts/plsql/readlong.txt
rem Filename: readlong.sql
rem Purpose: Fetch Long column values piece-wise from PL/SQL
rem Date: 12-Jan-1999
rem Author: Frank Naude (frank@ibi.co.za)
rem -----------------------------------------------------------------------
set serveroutput on
-- Create test table
drop table longtable;
create table longtable (longcol long) tablespace TOOLS;
insert into longtable values ( rpad('x', 257, 'QWERTY') );
DECLARE
cur1 PLS_INTEGER := DBMS_SQL.OPEN_CURSOR;;
rc NUMBER;
long_piece VARCHAR2(256);
piece_len INTEGER := 0;
long_tab DBMS_SQL.VARCHAR2S;
long_len INTEGER := 0;
BEGIN
DBMS_SQL.PARSE(cur1, 'select longcol from longtable', DBMS_SQL.NATIVE);
DBMS_SQL.DEFINE_COLUMN_LONG(cur1, 1);
rc := DBMS_SQL.EXECUTE(cur1);
rc := DBMS_SQL.FETCH_ROWS(cur1); -- Get one row
-- Loop until all pieces of the long column are processed
LOOP
DBMS_SQL.COLUMN_VALUE_LONG(cur1, 1, 256, long_len, long_piece, piece_len);
EXIT WHEN piece_len = 0;
DBMS_OUTPUT.PUT_LINE('Long piece len='|| piece_len);
long_tab( NVL(long_tab.LAST, 0)+1 ) := long_piece; -- Add piece to table
long_len := long_len + piece_len;
END LOOP;
DBMS_SQL.CLOSE_CURSOR(cur1);
DBMS_OUTPUT.PUT_LINE('Total long col fetched, len='|| long_len);
END;
/
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