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The following example is from Chapter 21 of the book Oracle8 PL/SQL Programming by Scott Urman (you'd pass in the query against your fsp_viewport_drawings table as the first parameter when you run it):
CREATE OR REPLACE PROCEDURE Long2Lob(
-- Uses DBMS_SQL to select a LONG column identified by p_LongQuery, and
-- returns it in p_CLob.
p_LongQuery IN VARCHAR2,
p_CLob IN OUT CLOB)
AS
c_ChunkSize CONSTANT INTEGER := 100;
v_CursorID INTEGER;
v_RC INTEGER;
v_Chunk VARCHAR2(100);
v_ChunkLength INTEGER;
v_Offset INTEGER := 0;
BEGIN
-- Open the cursor, define, execute, and fetch.
v_CursorID := DBMS_SQL.OPEN_CURSOR;
DBMS_SQL.PARSE(v_CursorID, p_LongQuery, DBMS_SQL.V7);
DBMS_SQL.DEFINE_COLUMN_LONG(v_CursorID, 1);
v_RC := DBMS_SQL.EXECUTE_AND_FETCH(v_CursorID);
-- Loop over the LONG, fetching c_ChunkSize characters at a time from
-- the LONG and adding them to the LOB.
LOOP
DBMS_SQL.COLUMN_VALUE_LONG(v_CursorID, 1, c_ChunkSize, v_Offset, v_Chunk, v_ChunkLength);
DBMS_LOB.WRITE(p_CLob, v_ChunkLength, v_Offset + 1, v_Chunk);
IF v_ChunkLength < c_ChunkSize THEN
EXIT;
ELSE
v_Offset := v_Offset + v_ChunkLength;
END IF;
END LOOP;
DBMS_SQL.CLOSE_CURSOR(v_CursorID);
EXCEPTION
WHEN OTHERS THEN
-- Clean up, and reraise the error.
DBMS_SQL.CLOSE_CURSOR(v_CursorID);
RAISE;
END Long2Lob;
/
This code worked fine in my quick tests. Hope it helps.For More Information
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