LONG data type in a database read-only

I would only run this query...

SELECT MAX (nrr_id) AS nrr_id, LENGTH (nrr_narrative) AS nrr_narrative_length
Stories
GROUP OF LENGTH (nrr_narrative)
ORDER BY 2;

The problem is, nrr_narrative is a LONG data type, so LENGTH won't work.

I did the game of legs (on the web) and saw several interesting ways to get around this restriction for the long data type The problem is, they need either SysEx in a new table and redesign of the LONG like a LOB (or similar) or write a stored procedure or function that re - throws the column and returns the length. I can't do either (or one of the other more esoteric suggestions) because the table exists in a database I am not and that I don't have very few privileges.

I could create a link to db on my server to the external source and make the overhaul in a table (or by using a stored procedure) on my server, but the connection is slow and even a simple select on a db link expires quite frequently.

You can write the PL/SQL code. Something like:

DECLARE
    TYPE nrr_id_tbl_type IS TABLE OF NUMBER
      INDEX BY PLS_INTEGER;
    v_nrr_id_tbl nrr_id_tbl_type;
    v_len NUMBER;
BEGIN
    FOR v_rec IN (SELECT nrr_id,nrr_narrative FROM narratives) LOOP
      IF v_nrr_id_tbl.EXISTS(LENGTH(v_rec.nrr_narrative))
        THEN
          v_nrr_id_tbl(LENGTH(v_rec.nrr_narrative)) := GREATEST(
                                                                v_nrr_id_tbl(LENGTH(v_rec.nrr_narrative)),
                                                                v_rec.nrr_id
                                                               );
        ELSE
          v_nrr_id_tbl(LENGTH(v_rec.nrr_narrative)) := v_rec.nrr_id;
      END IF;
    END LOOP;
    v_len := v_nrr_id_tbl.FIRST
    FOR v_i IN 1..v_nrr_id_tbl.COUNT LOOP
      DBMS_OUTPUT.PUT_LINE('LENGTH(nrr_narrative) = ' || v_len || ', MAX(nrr_id) = ' || v_nrr_id_tbl(v_len));
      v_len := v_nrr_id_tbl.NEXT(v_len);
    END LOOP;
END;
/

SY.
P.S. It will not work if nrr_narrative is greater than 32760, which is the maximum length of the LONG PL/SQL data type.

Published by: Solomon Yakobson on 13 December 2011 14:52

Tags: Database

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