How to lock a row containing a LOB value?

I use a process called "lob_replace":

CREATE OR REPLACE
PROCEDURE lob_replace
(
p_lob IN OUT CLOB,
p_what IN VARCHAR2,
p_with IN VARCHAR2)
AS
n NUMBER.
BEGIN
n: = dbms_lob.instr (p_lob, p_what);
IF (NVL (n, 0) & gt; 0) THEN
DBMS_LOB. Copy (p_lob, p_lob, dbms_lob.getlength (p_lob), n-LENGTH (p_with), n-LENGTH (p_what));
DBMS_LOB. Write (p_lob, (p_with) LENGTH, n, p_with);
IF (LENGTH (p_what) & gt; Length (p_with)) THEN
DBMS_LOB. Trim (p_lob, dbms_lob.getlength (p_lob)-((p_what)-(p_with) LENGTH LENGTH));
END IF;
END IF;
END;
/

I'm testing this procedure:

DECLARE
a_lob CLOB.
CURSOR my_cur
IS
SELECT b.data
OF h_content_mgt m.
h_articlemgr am,
h_clob b
WHERE m.menu_id = 1915
AND m.type = 1
AND $m.name = 'WWWSITE_CORPCITIZEN_OVERVIEW_HTML. '
AND am.id = m.content_id
AND b.id = am.clob_id;
BEGIN
OPEN my_cur.
SEEK my_cur INTO a_lob;

lob_replace (a_lob, 'Hello', 'Goodbye');
CLOSE My_cur;
END;
/

Each time, I get the following results:

Error report:
ORA-22920: the row containing the LOB value is not locked
ORA-06512: at "SYS." DBMS_LOB", line 429
ORA-06512: at "T_DB. LOB_REPLACE', line 11
ORA-06512: at line 18 level
22920 00000 - "the row containing the LOB value is not locked.
* Cause: The row containing the LOB value must be locked before updating the LOB value.
* Action: Lock the row containing the LOB value before updating the LOB value.

I'm new to PL\SQL and I use the book by Feuerstein Oracle PL/SQL Programming . How to lock a row containing a LOB value?

Try this

Specify the clause
in select it.
UPDATE

CURSOR toys_cur IS
   SELECT name, manufacturer, preference_level, sell_at_yardsale_flag
     FROM my_sons_collection
    WHERE hours_used = 0
      FOR UPDATE;

Published by: alvinder on March 5, 2009 10:12

Tags: Database

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