BFILE로 저장된 데이타 정보를 확인하는 방법

Question

제품 : ORACLE SERVER
작성날짜 : 2002-04-12
BFILE로 저장된 데이타 정보를 확인하는 방법
==========================================
Purpose
Bfile 로 저장된 column의 경우 database 내에서는 file path만 알 수 있다.
여러가지 package를 사용하여 이 bfile로 저장된 data의 정보를 확인하는
방법을 알아보자.
Example
$ vi bfiletest.sql
rem BFILE Example
set echo on
set serveroutput on;
drop directory some_dir_alias;
create directory some_dir_alias as '/mnt3/rctest80/server/ejlee/bfile';
drop table bfiletest;
create table bfiletest (
doc_id number,
doc_file bfile
insert into bfiletest values (1,bfilename('SOME_DIR_ALIAS','docu1.txt'));
declare
i_doc_file BFILE;
i_file_size NUMBER;
i_doc_file_dir VARCHAR2(30);
i_doc_file_name VARCHAR2(2000);
buffer varchar2(100);
amount binary_integer:=5;
offset NUMBER := 2;
begin
select doc_file into i_doc_file from bfiletest where doc_id=1;
if i_doc_file is not null then
if dbms_lob.fileisopen(i_doc_file) = 1 then
dbms_output.put_line('file is open so we are closing file');
dbms_lob.fileclose(i_doc_file);
end if;
dbms_lob.filegetname(i_doc_file,i_doc_file_dir,i_doc_file_name);
dbms_output.put_line('DIRECTORY: ' || i_doc_file_dir);
dbms_output.put_line('Name : ' || i_doc_file_name);
i_doc_file:=BFILENAME(i_doc_file_dir,i_doc_file_name);
dbms_lob.fileopen(i_doc_file,DBMS_LOB.FILE_READONLY);
dbms_lob.read(i_doc_file, amount, offset, buffer);
dbms_output.put_line('Buffer is :'||utl_raw.cast_to_varchar2(buffer));
i_file_size:=DBMS_LOB.GETLENGTH(i_doc_file);
dbms_output.put_line('Length is '||i_file_size);
end if;
end;
실행 결과
SQL> @bfiletest
SQL> set echo on
SQL> set serveroutput on;
SQL> drop directory some_dir_alias;
Directory dropped.
SQL> create directory some_dir_alias as '/mnt3/rctest80/server/ejlee/bfile';
Directory created.
SQL>
SQL> drop table bfiletest;
Table dropped.
SQL> create table bfiletest (
2 doc_id number,
3 doc_file bfile
4 );
Table created.
SQL> insert into bfiletest values (1,bfilename('SOME_DIR_ALIAS','docu1.txt'));
1 row created.
SQL> commit;
SQL> declare
2 i_doc_file BFILE;
3 i_file_size NUMBER;
4 i_doc_file_dir VARCHAR2(30);
5 i_doc_file_name VARCHAR2(2000);
6 buffer varchar2(100);
7 amount binary_integer:=5;
8 offset NUMBER := 2;
9 begin
10 select doc_file into i_doc_file from bfiletest where doc_id=1;
11 if i_doc_file is not null then
12 if dbms_lob.fileisopen(i_doc_file) = 1 then
13 dbms_output.put_line('file is open so we are closing file');
14 dbms_lob.fileclose(i_doc_file);
15 end if;
16 dbms_lob.filegetname(i_doc_file,i_doc_file_dir,i_doc_file_name);
17 dbms_output.put_line('DIRECTORY: ' || i_doc_file_dir);
18 dbms_output.put_line('Name : ' || i_doc_file_name);
19 i_doc_file:=BFILENAME(i_doc_file_dir,i_doc_file_name);
20 dbms_lob.fileopen(i_doc_file,DBMS_LOB.FILE_READONLY);
21 dbms_lob.read(i_doc_file, amount, offset, buffer);
22 dbms_output.put_line('Buffer is :'||utl_raw.cast_to_varchar2(buffer));
23 i_file_size:=DBMS_LOB.GETLENGTH(i_doc_file);
24 dbms_output.put_line('Length is '||i_file_size);
25 end if;
26 end;
27 /
DIRECTORY: SOME_DIR_ALIAS
Name : docu1.txt
Buffer is :his i
Length is 15
PL/SQL procedure successfully completed.

Answer 1