CLOB to BLOB

Hi,
I have a database (9.2.0.8) with CLOB
which contains word documents (mistake, I know)
When I migrate to 10g (exp/imp) my .doc are no more readable
how can I transform my CLOB to BLOB
so they stay readable when exp/imp to a 10g database ?
Thanks in advance

tconstant wrote:
Hi,
I have a database (9.2.0.8) with CLOB
which contains word documents (mistake, I know)
When I migrate to 10g (exp/imp) my .doc are no more readable
how can I transform my CLOB to BLOB
so they stay readable when exp/imp to a 10g database ?
Thanks in advanceWell, the fact that the word documents have been stored in a CLOB in the first place means that they have probably been corrupted (the binary data of the word documents has not been stored in a binary compatible format). If you can read the documents on your 9.2.0.8 instance, I would suggest getting them out of there a.s.a.p. and backing them up, then reload them into BLOB columns on your new instance so they are stored properly.

Similar Messages

BASE64 (PDF) CLOB to BLOB

Hello everybody! I have to convert a BASE64 representation of a PDF file to BLOB. I found one example on the Internet but there is something wrong with it and I can't figure it out.
create or replace function decode_base64(p_clob_in in clob) return blob is
v_blob           blob;
v_offset         integer;
v_buffer_varchar varchar2(32000);
v_buffer_raw     raw(32000);
v_buffer_size    binary_integer := 32000;
begin
if p_clob_in is null then
return null;
end if;
dbms_lob.CREATETEMPORARY(v_blob, true);
v_offset := 1;
FOR i IN 1..CEIL(dbms_lob.GETLENGTH(p_clob_in) / v_buffer_size)
loop
dbms_lob.READ(p_clob_in, v_buffer_size, v_offset, v_buffer_varchar);
v_buffer_raw := utl_encode.BASE64_DECODE(utl_raw.CAST_TO_RAW(v_buffer_varchar));*
dbms_lob.WRITEAPPEND(v_blob, utl_raw.LENGTH(v_buffer_raw), v_buffer_raw);
v_offset := v_offset v_buffer_size;+
end loop;
return v_blob;
end decode_base64;
The above procedure should work with files of any size (since there is a loop), but it only works when the PDF is smaller than 32 KB.

Just a guess.
You may have additional CRLFs added when encoding.
Try this:
create or replace function replaceClob (opCLob CLOB,cpReplaceStr VARCHAR2,cpReplaceWith VARCHAR2) RETURN CLOB IS
   cBuffer    VARCHAR2 (32767);
   nBuffer    BINARY_INTEGER := 32767;
   nStart     PLS_INTEGER := 1;
   nLen            PLS_INTEGER;
   oCRtn      CLOB := EMPTY_CLOB;
   BEGIN
     DBMS_LOB.CreateTemporary(oCRtn,TRUE);
     nLen := DBMS_LOB.GetLength(opCLob);
     WHILE nStart < nLen
     LOOP
       DBMS_LOB.Read(opCLob, nBuffer, nStart, cBuffer);
       IF cBuffer IS NOT NULL THEN
         cBuffer := REPLACE(cBuffer, cpReplaceStr, cpReplaceWith);
         DBMS_LOB.WriteAppend(oCRtn, LENGTH(cBuffer), cBuffer);
       END IF;
       nStart := nStart + nBuffer;
     END LOOP;
     RETURN oCRtn;
   END;and then add to your code:
create or replace function decode_base64(p_clob_in in clob) return blob is
       v_blob blob;
       v_offset integer;
       v_tem_clob clob;
       v_buffer_varchar varchar2(32000);
       v_buffer_raw raw(32000);
       v_buffer_size binary_integer := 32000;
       --v_buffer_size binary_integer := 3*1024;
       begin
       if p_clob_in is null then
          return null;
       end if;
       -- Add this line
       v_tem_clob := replaceClob(p_clob_in,UTL_TCP.CRLF,'');
       dbms_lob.CREATETEMPORARY(v_blob, true);
       v_offset := 1;
       FOR i IN 1..CEIL(dbms_lob.GETLENGTH(v_tem_clob) / v_buffer_size) loop
           dbms_lob.READ(v_tem_clob, v_buffer_size, v_offset, v_buffer_varchar);
           v_buffer_raw := utl_encode.BASE64_DECODE(utl_raw.CAST_TO_RAW(v_buffer_varchar));
           dbms_lob.WRITEAPPEND(v_blob, utl_raw.LENGTH(v_buffer_raw), v_buffer_raw);
           v_offset := v_offset + v_buffer_size;
       end loop;
       return v_blob;
end decode_base64;Not tested.
HTH
Thomas

?Working with clob and blob - using Dbms_Lob

I need to search through a blob and remove some of the data, but having problems working with dbms_lob.erase.
Reading the documentation, the procedure is supposed to work with either blobs or clobs, but I can't get it to work with the blob.
Here's what I've coded and it does not work correctly for blobs.
What have I've done wrong?
declare
v_start                   integer;
v_stop                    integer;
v_amount                  integer;
v_max_len                  integer:=32676;
v_offset                   integer:=1;
v_new_length               integer;
v_clob clob;
v_blob blob;
begin
update test_clob
set clob_id = clob_id
where clob_id = 1
returning clob_desc into v_clob;
v_start := 0;
v_stop := 0;
v_amount := 0;
v_start := dbms_lob.instr(v_clob, '<property name="Name">SortMode', v_offset );
v_stop := dbms_lob.instr(v_clob, '</property>', v_start );
v_amount := ((v_stop - v_start)+11) ;
dbms_output.put_line('Clob: '||v_clob);
dbms_lob.erase(v_clob, v_amount, v_start);
dbms_output.put_line('Clob: '||v_clob);
rollback;
update test_clob
set clob_id = clob_id
where clob_id = 1
returning blob_desc into v_blob;
v_start := 0;
v_stop := 0;
v_amount := 0;
v_start := dbms_lob.instr(v_blob, utl_raw.cast_to_raw('<property name="Name">SortMode'), v_offset );
v_stop := dbms_lob.instr(v_blob, utl_raw.cast_to_raw('</property>'), v_start );
v_amount := ((v_stop - v_start)+11) ;
dbms_output.put_line('Blob: '||utl_raw.cast_to_varchar2(v_blob) );
dbms_lob.erase(v_blob, v_amount, v_start);
dbms_output.put_line('Blob: '||utl_raw.cast_to_varchar2(v_blob) );
rollback;
end trg_bui_user_assoc_layout;
/This is the output
Clob: this is only a test <property name="Name">SortMode</property> should leave this alone
Clob: this is only a test                                            should leave this alone
Blob: this is only a test <property name="Name">SortMode</property> should leave this alone
Blob: this is only a test

Well, you left out the table DDL and your insert for sample data (would be nice to have) as well as your Oracle version (pretty much a necessity).
Since i had to make my own there could be a difference in how you populated your table, but i can't reproduce your findings.
ME_ORCL?drop table test_clob purge;
Table dropped.
Elapsed: 00:00:00.09
ME_ORCL?
ME_ORCL?create table test_clob
2 (
3     clob_id     number not null primary key,
4     clob_desc   clob,
5     blob_desc   blob
6 );
Table created.
Elapsed: 00:00:00.03
ME_ORCL?
ME_ORCL?insert into test_clob values
2 (
3        1
4     , 'this is only a test <property name="Name">SortMode</property> should leave this alone'
5     , utl_raw.cast_to_raw('this is only a test <property name="Name">SortMode</property> should leave this alone')
6 );
1 row created.
Elapsed: 00:00:00.01
ME_ORCL?
ME_ORCL?commit;
Commit complete.
Elapsed: 00:00:00.01
ME_ORCL?
ME_ORCL?declare
2 v_start                   integer;
3 v_stop                    integer;
4 v_amount                  integer;
5 v_max_len                  integer:=32676;
6 v_offset                   integer:=1;
7 v_new_length               integer;
8
9 v_clob clob;
10 v_blob blob;
11
12 begin
13
14   update test_clob
15   set clob_id = clob_id
16   where clob_id = 1
17   returning clob_desc into v_clob;
18
19   v_start := 0;
20   v_stop := 0;
21   v_amount := 0;
22
23   v_start := dbms_lob.instr(v_clob, '<property name="Name">SortMode', v_offset );
24   v_stop := dbms_lob.instr(v_clob, '</property>', v_start );
25   v_amount := ((v_stop - v_start)+11) ;
26
27   dbms_output.put_line('Clob: '||v_clob);
28
29   dbms_lob.erase(v_clob, v_amount, v_start);
30
31   dbms_output.put_line('Clob: '||v_clob);
32
33   rollback;
34
35   update test_clob
36   set clob_id = clob_id
37   where clob_id = 1
38   returning blob_desc into v_blob;
39
40   v_start := 0;
41   v_stop := 0;
42   v_amount := 0;
43
44   v_start := dbms_lob.instr(v_blob, utl_raw.cast_to_raw('<property name="Name">SortMode'), v_offset );
45   v_stop := dbms_lob.instr(v_blob, utl_raw.cast_to_raw('</property>'), v_start );
46   v_amount := ((v_stop - v_start)+11) ;
47
48   dbms_output.put_line('Blob: '||utl_raw.cast_to_varchar2(v_blob) );
49
50   dbms_lob.erase(v_blob, v_amount, v_start);
51
52   dbms_output.put_line('Blob: '||utl_raw.cast_to_varchar2(v_blob) );
53
54   rollback;
55
56 end trg_bui_user_assoc_layout;
57 /
Clob: this is only a test <property name="Name">SortMode</property> should leave this alone
Clob: this is only a test                                            should leave this alone
Blob: this is only a test <property name="Name">SortMode</property> should leave this alone
Blob: this is only a test                                            should leave this alone
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.03
ME_ORCL?select *
2 from v$version;
BANNER
Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - Production
PL/SQL Release 11.2.0.2.0 - Production
CORE    11.2.0.2.0      Production
TNS for Linux: Version 11.2.0.2.0 - Production
NLSRTL Version 11.2.0.2.0 - Production
5 rows selected.
Elapsed: 00:00:00.03
ME_ORCL?

Convert clob to blob

Anyone know an easy way to convert clob data to blob data?
We upgraded a client to 8.1.7.2 and now we can no longer store MS-Word templates to the RDBMS.
I deduce this is because MS-Word templates are binary files.
Earlier versions of 8.1.7 and 8.1.6 allowed us to do this. However, this is no longer the case.
Some of my clob rows are over 6 meg.
I have written some PL/SQL code to basically retrieve the clob data in cursor, loops through the clob in 32767 blocks,
performing dbms_lob.substr, converts that data to hex(major pain), & then write the blocks using dbmbs_lob.write.
I keep getting the proverbial "ORA-06502: PL/SQL: numeric or value error: invalid LOB locator specified: ORA-22275".
Does anyone see flaws in my approach and might have an easier solution?
Thanks!

Here's my code:
REATE OR REPLACE
PROCEDURE p_load_clob_to_blob IS
* Name:           p_load_clob_to_blob
* Parameters: None
* Purpose: This procedure loads the narr_blob column in the narr table_text with clob data from the
* narr column.
* Notes: This procedure assumes that narr table has been altered with narr_blob column added.
* See the SQL below:
*               alter table narr_text add (narr_blob blob);
* Once this procedure executes, the table must altered to drop the narr_text clob column,
* recreate the narr_text as blob, & then repopulate narr_text. See the SQL below:
*                     alter table narr_text drop column narr;
*                    alter table narr_text add (narr blob);
*                    update narr_text set narr = narr_blob;
*                    commit;
* Called By: Sys Admin
* CHANGE LOG
* Changed By Date Change Description
* EAO          01/16/02 Created.
rec_read      INTEGER;
rec_update      INTEGER;
write_cnt INTEGER;
write_amount BINARY_INTEGER;
write_offset INTEGER;
write_loop INTEGER;
total_length      NUMBER;
total_written      NUMBER;
buffer VARCHAR2(32767);
bbuffer RAW(32767);
temp_narr_id NUMBER;
max_loop               INTEGER;
cx                    CLOB;
bx                    BLOB;
bx2                    BLOB;
cur_evt               varchar2(50); -- current event
v_err_descr          varchar2(256);
i INTEGER;
hex                    varchar(32767);
CURSOR c_load_narr_clob IS
     SELECT narr, narr_id
     FROM narr_text
     where narr_id = 6366;
BEGIN
insert_event_log('', 'p_load_clob_to_blob', '', '', '', 'p_load_clob_to_blob started', '');
rec_read := 0;
rec_update := 0;
---Fill file
insert_event_log('', 'p_load_clob_to_blob ','c_load_narr_clob ', '', 'S', 'c_narr_clob started', '');
FOR csr IN c_load_narr_clob LOOP
     cur_evt := 'Select narr from narr table: ';
     rec_read := rec_read + 1;
     write_loop := 1;
     write_cnt := 0;
     write_offset := 1;
     total_written := 0;
     cx := csr.narr;
bx := empty_blob();
     total_length := DBMS_LOB.GETLENGTH(cx);
     max_loop := (total_length / 32767) + 1;
     if (total_length <= 32767) THEN
          write_amount := total_length;
     ELSE
          write_amount := 32767;
     END IF;
dbms_output.put_line('Length=' || to_char(total_length) || ' Max loop=' || to_char(max_loop) || ' Write Amount=' || to_char(write_amount));
     temp_narr_id := csr.narr_id;
     while write_cnt < max_loop
     loop
--FOR write_loop in 1..max_loop LOOP
          delete temp_blob;
          delete temp_raw;
          commit;
          cur_evt := 'Dbms_lob.substr: ';
          dbms_output.put_line(cur_evt);
buffer := DBMS_LOB.SUBSTR(cx, write_amount, write_offset);
          dbms_output.put_line('Write Amount='|| to_char(write_amount) || ' Write Offset=' || to_char(write_offset) );
cur_evt := 'Hex to Raw Assigment: ';
          dbms_output.put_line(cur_evt);
          bbuffer := null;
          for i in 1..write_amount loop
               hex := numtohex(ascii(substrb(buffer,i,1)));
               bbuffer := bbuffer || hextoraw(hex);
          end loop;
cur_evt := 'Insert temp_raw: ';
          dbms_output.put_line(cur_evt);
          insert into temp_raw(rx)
               values (bbuffer);
          commit;
cur_evt := 'Insert temp_blob: ';
          dbms_output.put_line(cur_evt);
          execute immediate 'insert into temp_blob(bx)
               select TO_LOB(rx) from temp_raw';
          commit;
          cur_evt := 'Select bx2: ';
          dbms_output.put_line(cur_evt);
          bx2 := empty_blob();
          select bx into bx2 from temp_blob;
          cur_evt := 'Dbms_lob.append: ';
          dbms_output.put_line(cur_evt);
          dbms_lob.append(bx, bx2);
     dbms_output.put_line('Write Amount='|| to_char(write_amount) || ' Write Offset=' || to_char(write_offset) );
          write_offset := write_offset + write_amount;
          total_written := total_written + write_amount;
          write_cnt := write_cnt + 1;
          if (write_cnt = max_loop) then
          write_amount := total_length - total_written;
          end if;
END LOOP;
dbms_output.put_line('Total_written = ' || to_char(total_written) );
     cur_evt := 'Upd narr_blob in narr table: ';
     update narr_text
     set narr_blob = bx
     where narr_id = temp_narr_id;
     rec_update := rec_update + 1;
     commit;
END LOOP;
insert_event_log('', 'p_load_clob_to_blob ','c_load_narr_clob ', '', 'C', 'c_narr_clob completed', '');
dbms_output.put_line('Records read=' || to_char(rec_read) || ' Records updated=' || to_char(rec_update) );
insert_event_log('', 'p_load_clob_to_blob', '', '', '', 'p_load_clob_to_blob ended', '');
EXCEPTION
     WHEN OTHERS THEN
     Rollback;
     v_err_descr := 'FATAL ERROR OCCURRED -'||cur_evt||sqlerrm;
     dbms_output.put_line (v_err_descr);
END;
FUNCTION numtohex(v_hex number) return varchar2
is
hex varchar2(4);
num1 number;
num2 number;
begin
num1 := trunc(v_hex/16);
num2 := v_hex-(num1*16);
if ( num1 >= 0 and num1 <= 9 ) then
hex := hex||to_char(num1);
end if;
if num1 = 10 then hex := hex||'A'; end if;
if num1 = 11 then hex := hex||'B'; end if;
if num1 = 12 then hex := hex||'C'; end if;
if num1 = 13 then hex := hex||'D'; end if;
if num1 = 14 then hex := hex||'E'; end if;
if num1 = 15 then hex := hex||'F'; end if;
if ( num2 >= 0 and num2 <= 9 ) then
hex := hex||to_char(num2);
end if;
if num2 = 10 then hex := hex||'A'; end if;
if num2 = 11 then hex := hex||'B'; end if;
if num2 = 12 then hex := hex||'C'; end if;
if num2 = 13 then hex := hex||'D'; end if;
if num2 = 14 then hex := hex||'E'; end if;
if num2 = 15 then hex := hex||'F'; end if;
return hex;
end;

How we handle CLOB and BLOB Datatypes in HANA DB

Dear HANA Gurus,
We have would like to build EDW using HANA base on our source system Oracle and it's supports CLOB and BLOB datatypes
Would you please suggest how do we handle in HANA DB.
Let not say it's oracle specific.
Regards,
Manoj

Hello,
check SAP HANA SQL Reference Guide for list of data types:
(page 14 - Classification of Data Types)
https://service.sap.com/~sapidb/011000358700000604922011
For this purpose might be useful following data types:
Large Object (LOB) Types
LOB (large objects) data types, CLOB, NCLOB and BLOB, are used to store a large amount of data such as text documents and images. The maximum size of an LOB is 2 GB.
BLOB
The BLOB data type is used to store large binary data.
CLOB
The CLOB data type is used to store large ASCII character data.
NCLOB
The NCLOB data type is used to store a large Unicode character object.
Tomas

CLOB vs BLOB datatypes

Which is the best datatype to use that will hold an input stream or byte stream, CLOB or BLOB?
Thank you.

Saber wrote:
Which is the best datatype to use that will hold an input stream or byte stream, CLOB or BLOB?
Thank you.CLOB is for character data ... so you'd want a BLOB.
http://docs.oracle.com/cd/E11882_01/server.112/e26088/sql_elements001.htm#SQLRF50997

Can't use clob and blob

I just created a new database using dbca with General Purpose as the template, as I've done before. All went well until I tried to create tables that used clob or blob datatypes. I kept getting the error "ORA-03001: unimplemented feature".
What happened? Was the database created improperly? Is there a way to correct this without recreating the database?
Thanks

I just created a new database using dbca with General
Purpose as the template, as I've done before. All
went well until I tried to create tables that used
clob or blob datatypes. I kept getting the error
"ORA-03001: unimplemented feature".
I have the same problem but only if I assign a tablespace to the table but not if i leave it to the default tablespace.

How to convert CLOB to BLOB with SQL Developer migration wizard?

Hi,
According to our requirement, we need to only migrate data from SQL Server 2008 to Oracle 11. I use the SQL Developer 3.0.04 migration wizard to do it.
I do migration from SQL Server (database name: SCDS41P2) to Oracle (User name: HCDS41P2).
My migration steps are as below: (I need to modify the target schema, so I add the steps 2) and step 3) )
1) Do migration by SQL Developer migration wizard;
2) Remove the Converted Database Objects node from migration project;
3) Re-do convert by SQL Developer migration wizard (contains changing the target schema);
When do step 1), the DBO_SCDS41P2 user is created automatically. CLOBTOBLOB_SQLDEVELOPER procedure is also created in this user.
I continued to run step 2) and step 3) with online mode. And find the table data which contains BLOB column can be moved into the target table. But from the Logging Page, I can't see the other detailed error info, so that I can't check which tables don't move data successfully.
Could you please tell me where the detail log file (e.g. contains every table's migration status) is if I use the online mode?
Additional, If I use offline mode to do step 3), I found the CLOB data can't be converted into BLOB automatically. Because in the load script (that is oracle_ctl.bat), only copy the source data to the CLOB column. After copy, it don't deal with the converting from CLOB to BLOB.
So could you please tell me how to convert CLOB to BLOB with offline mode?
Thanks so much.

Hi,
For your first question about logging - after the migration there will be an entry in the right hand panel for the migration project. If you open this there are various fields that give information about the status of each part of the migration. Does this give you the information you need ?
For the second problem about offline moving blob data have a look at the SQL*Developer documentation -
Oracle® SQL Developer User’s Guide Release 3.0
in the section -
2.2.8.1.4 Populating the Destination Database Using the Data Files
which describes the problem and how to get round it.
Regards,
Mike
Edited by: mkirtley on Aug 12, 2011 10:49 AM

How to use clob or blob data type in OWB

how to use clob or blob data type in OWB?
if OWB not surport these data type,how can i extract the large data type from data source

The same question was asked just two days ago No Data Found: ORA-22992
Nikolai Rochnik

CLOB v BLOB?

My customer wants to store a PDF in a database colomn...
Which is better, CLOB or BLOB? Why?

Why not just store the PDF in an o/s location andjust store a file reference on the database to keep
things simple?
But then you run the risk of losing the document one
day since database backup and recovery will not be
able to backup and restore this external reference.Indeed Kamal, and that's why I said it depends on the requirements. Can depend on many factors including where documents are originally stored and what backup strategy is in place for the servers etc. We'd have to look at the whole requirements, but that's out of scope of the original question here. ;)

Converting varchar2 to BLOB or converting CLOB to BLOB

Hi i am using a table where i have to convert a field currently existing as a varchar2 or CLOB to a BLOB field.
while doing this i also have to preserve the data currently existing in the table.
Please help.
Thanks

CLOB to a BLOB CREATE OR REPLACE FUNCTION clob_to_blob (clob_in IN CLOB) RETURN BLOB AS
v_blob BLOB;
v_varchar RAW(32001);
v_varchar1 RAW(32001);
v_start INTEGER := 1;
v_buffer INTEGER := 32001;
BEGIN
DBMS_LOB.CREATETEMPORARY(v_blob, TRUE);
FOR i IN 1..CEIL(DBMS_LOB.GETLENGTH(clob_in) / v_buffer) LOOP
DBMS_LOB.READ(clob_in,v_buffer,v_start,v_varchar);
DBMS_LOB.WRITEAPPEND(v_blob, utl_raw.length(v_varchar), v_varchar);
v_start := v_start + v_buffer;
END LOOP;
RETURN v_blob;
END clob_to_blob;
/

Invalid data after converting clob to blob

GOAL: insert adresse or someth. into an msword file out of database
Hi,
I'm working with a 9i database and I'm trying to insert data in a clob. First I convert the blob, which is a stored xml- file in my databse, to a clob. after that i'm replacing the data I want to insert and then reconverting to blob. It goes very well, but when the data I insert contains a 'ö' or 'ä' or 'ß' the blob file i get is invalid and can't be read by msword! I opened the file with notepad and instead of 'ö' etc there is a very strange sign like a square. here is my plsql- code:
loop
test:=substr(v_clob,posi,len);
posi:=posi+32767;
if length(v_clob)-posi<32767 then
len:=length(v_clob)-posi+1;
end if;
--vartest:=utl_raw.cast_to_raw(v_clob);
DBMS_LOB.WRITE(r_blob, length(test),posi-32767, utl_raw.cast_to_raw(test));
exit when posi>length(v_clob);
end loop;
DBMS_LOB.freetemporary(v_clob);
return r_blob;
because of 9i doesn't contain the procedure dbms_lob.converttoblob i user utl_raw.cast_to_raw and split my clob in several parts with a size of 32767 characters
i also tried with utl_raw.convert with several character sets, but don't know which one to take...
nls_lang of database server is set to GERMAN_GERMANY.WE8MSWIN1252
can anyone help me please!
Message was edited by:
user472439

dbms_lob.writeappend expects a real lob locator, which you can only get by selecting from a lob column.
create table blobtab (b blob);
insert into blobtab values (empty_blob());
CREATE OR REPLACE FUNCTION clob_to_blob (clob_in IN CLOB)
RETURN BLOB
AS
v_blob blob;
v_varchar RAW(32767);
v_start BINARY_INTEGER := 1;
v_buffer BINARY_INTEGER := 32767;
BEGIN
select b into v_blob from blobtab;
FOR i IN 1..CEIL(DBMS_LOB.GETLENGTH(clob_in) / v_buffer)
LOOP
v_varchar := UTL_RAW.CAST_TO_RAW(DBMS_LOB.SUBSTR(clob_in, v_buffer, v_start)) ;
DBMS_OUTPUT.PUT_LINE(' DATA :' || DBMS_LOB.SUBSTR(clob_in, v_buffer, v_start));
DBMS_OUTPUT.PUT_LINE(' V_VARCHAR :' || v_VARCHAR);
DBMS_OUTPUT.PUT_LINE(' V_VARCHAR LENGTH :' || utl_raw.LENGTH(v_VARCHAR));
DBMS_LOB.WRITEAPPEND(v_blob, utl_raw.LENGTH(v_VARCHAR), v_varchar);
DBMS_OUTPUT.PUT_LINE('after append');
v_start := v_start + v_buffer;
END LOOP;
RETURN v_blob;
END clob_to_blob;
declare
blobvar blob;
begin
blobvar := clob_to_blob(dbms_xmlgen.getXML('select 1 from dual'));
end;
/

How to convert a CLOB to BLOB

Hi,
Can any one tell me how to convert a CLOB into BLOB? In Oracle 10g there is a function which is converttoblob(). But in Oracle 9i there is no function as such. If i am using Hextoraw() function still then its giving some pointer error. please let me know the solution.

FUNCTION c2b( c IN CLOB ) RETURN BLOB
-- typecasts CLOB to BLOB (binary conversion)
IS
pos PLS_INTEGER := 1;
buffer RAW( 32767 );
res BLOB;
lob_len PLS_INTEGER := DBMS_LOB.getLength( c );
BEGIN
DBMS_LOB.createTemporary( res, TRUE );
DBMS_LOB.OPEN( res, DBMS_LOB.LOB_ReadWrite );
LOOP
buffer := UTL_RAW.cast_to_raw( DBMS_LOB.SUBSTR( c, 16000, pos ) );
IF UTL_RAW.LENGTH( buffer ) > 0 THEN
DBMS_LOB.writeAppend( res, UTL_RAW.LENGTH( buffer ), buffer );
END IF;
pos := pos + 16000;
EXIT WHEN pos > lob_len;
END LOOP;
RETURN res; -- res is OPEN here
END c2b;

How to call CLOB to BLOB conversion function within stored procedure?

I have a tiny APEX application from which I need to be able to print. I’ve used these two resources: (Is there an inexpensive APEX report printer for invoices/checks/statements? and http://download.oracle.com/docs/cd/E14373_01/appdev.32/e13363/up_dn_files.htm#CJAHDJDA)
I guess that in order to be able to download the RTF document stored in CLOB, I need to convert it into BLOB. I’ve found this function for this purpose on Oracle forums:
CREATE OR REPLACE FUNCTION     c2b( c IN CLOB ) RETURN BLOB
-- typecasts CLOB to BLOB (binary conversion)
IS
          pos PLS_INTEGER := 1;
          buffer RAW( 32767 );
          res BLOB;
          lob_len PLS_INTEGER := DBMS_LOB.getLength( c );
BEGIN
     DBMS_LOB.createTemporary( res, TRUE );
     DBMS_LOB.OPEN( res, DBMS_LOB.LOB_ReadWrite );
LOOP
     buffer := UTL_RAW.cast_to_raw( DBMS_LOB.SUBSTR( c, 16000, pos ) );
     IF          UTL_RAW.LENGTH( buffer ) > 0
     THEN
               DBMS_LOB.writeAppend( res, UTL_RAW.LENGTH( buffer ), buffer );
     END IF;
     pos := pos + 16000;
     EXIT WHEN pos > lob_len;
END LOOP;
RETURN res; -- res is OPEN here
END c2b;And I am trying to use it in the modified download procedure that I also have found on Oracle forums:
CREATE OR REPLACE PROCEDURE DOWNLOAD_WO(v_id IN NUMBER)
AS
        v_mime          VARCHAR2(48);
        v_length     NUMBER;
        v_file_name     VARCHAR2(2000):= 'WO_Download.rtf';
        lob_loc          CLOB;
          v_blob      BLOB;
          v_company        jobs_vw.company%TYPE;
          v_project        jobs_vw.project%TYPE;
          v_description     jobs_vw.description%TYPE;
          v_date_          jobs_vw.date_%TYPE;
          v_job_no          jobs_vw.job_no%TYPE;
          v_apqwo               jobs_vw.apqwo%TYPE;
--          v_mime           VARCHAR2(48) := 'application/msword';
BEGIN
        SELECT     mime_type, report, DBMS_LOB.GETLENGTH(report)
          INTO     v_mime,lob_loc,v_length
          FROM     report_layouts
          WHERE     rl_id = 22332925279634283;
-- JOB_VW record:
    SELECT     job_no
               ,date_
               ,description
               ,apqwo
               ,project
               ,company
     INTO     v_job_no
               ,v_date_
               ,v_description
               ,v_apqwo
               ,v_project
               ,v_company
     FROM     jobs_vw
     WHERE     id = 214;
-- Replace holders with actual values:
    lob_loc := REPLACE(lob_loc, '#COMPANY#', v_company);
    lob_loc := REPLACE(lob_loc, '#PROJECT#', v_project);
    lob_loc := REPLACE(lob_loc, '#DESCRIPTION#', v_description);
    lob_loc := REPLACE(lob_loc, '#DATE_#', TO_CHAR(v_date_, 'DD/MM/YYYY'));
    lob_loc := REPLACE(lob_loc, '#JOB_NO#', v_job_no);
    lob_loc := REPLACE(lob_loc, '#APQWO#', v_apqwo);
              -- set up HTTP header
                    -- use an NVL around the mime type and
                    -- if it is a null set it to application/octect
                    -- application/octect may launch a download window from windows
                    owa_util.mime_header( nvl(v_mime,'application/octet'), FALSE );
                -- set the size so the browser knows how much to download
                htp.p('Content-length: ' || v_length);
                -- the filename will be used by the browser if the users does a save as
                htp.p('Content-Disposition: attachment; filename="'||replace(replace(substr(v_file_name,instr(v_file_name,'/')+1),chr(10),null),chr(13),null)|| '"');
                -- close the headers
                owa_util.http_header_close;
                -- download the BLOB
--                wpg_docload.download_file( Lob_loc );
                         v_blob := c2b(lob_loc);
                         wpg_docload.download_file( v_blob );
end DOWNLOAD_WO;
/Unfortunately when I try to compile the download_wo stored procedure I am getting this error:
Error at line 64: PL/SQL: Statement ignoredThe 64th line is:
v_blob := c2b(lob_loc);How should I correctly call c2b within download_wo? Any advice is greatly appreciated.
Thank you for your time.
Daniel

Hello there,
Well, its invalid :(
Object C2B is Invalid. I didn't know since when I run the create ... function, I only get this feedback:
Statement processed.
0.19 secondsI am investigating.
Daniel

How to convert clob to blob

hi
tell me some thong how we can convert clob to blob

You can use my procedure
create or replace procedure CLOB2BLOB (p_clob in out nocopy clob, p_blob in out nocopy blob) is
-- transforming CLOB â BLOB
l_off number default 1;
l_amt number default 4096;
l_offWrite number default 1;
l_amtWrite number;
l_str varchar2(4096 char);
begin
begin
loop
dbms_lob.read ( p_clob, l_amt, l_off, l_str );
l_amtWrite := utl_raw.length ( utl_raw.cast_to_raw( l_str) );
dbms_lob.write( p_blob, l_amtWrite, l_offWrite,
utl_raw.cast_to_raw( l_str ) );
l_offWrite := l_offWrite + l_amtWrite;
l_off := l_off + l_amt;
l_amt := 4096;
end loop;
exception
when no_data_found then
NULL;
end;
end;
Best regards, Victor

Converting CHAR or CLOB to BLOB in Oracle9i

Hi!
I want to convert CHAR or CLOB to BLOB.
I am working with Oracle9i Database.
Oracle9i Supplied PL/SQL Package Release 2 (9.2) does'nt support DBMS_LOB.CONVERTTOBLOB procedure.
How I can convert CHAR or CLOB to BLOB in Oracle9i?
Valery

Hi Valery,
For conversion to blob, just try the utl_raw package.
I use utl_raw.cast_to_raw quite often.
Or have a look at:
http://asktom.oracle.com/pls/ask/f?p=4950:8:::::F4950_P8_DISPLAYID:437819871174
Good luck,
Jan-Marcel

CLOB to BLOB

Similar Messages

Maybe you are looking for