如何使用Oracle的BFILE

1.创建相应的directory

使用具有足够权限的用处创建directory,具体参考:Using Create directory & UTL_FILE in Oracle

create or replace directory BFILE_DIR as

'/home/oracle/bfiletest';

[oracle@ts01 bfiletest]$ sqlplus '/ as sysdba'

SQL*Plus: Release 9.2.0.6.0 - Production on Mon Jan 23 10:54:17 2006

Connected to:

Oracle9i Enterprise Edition Release 9.2.0.6.0 - Production

With the Partitioning, OLAP and Oracle Data Mining options

JServer Release 9.2.0.6.0 - Production

SQL> show parameter utl_file_dir ***************9.2开始，已经废弃了这个参数

NAME TYPE VALUE

------------------------------------ ----------- ------------------------------

utl_file_dir string

SQL>

SQL> create or replace directory BFILE_DIR as

2 '/home/oracle/bfiletest';

Directory created.

Elapsed: 00:00:00.05

SQL>

SQL> col DIRECTORY_PATH for a50

SQL> select * from dba_directories;

OWNER DIRECTORY_NAME DIRECTORY_PATH

------------------------------ ------------------------------ --------------------------------------------------

SYS MEDIA_DIR /oracle/product/920/demo/schema/product_media/

SYS LOG_FILE_DIR /oracle/admin/TSMISC02/create/

SYS DATA_FILE_DIR /oracle/product/920/demo/schema/sales_history/

SYS KU$_STYLESHEET_DIR /oracle/product/920/rdbms/xml/xsl

SYS BFILE_DIR /home/oracle/bfiletest

Elapsed: 00:00:00.01

SQL>

2.给相应的用户授权

grant read on directory BFILE_DIR to lunar;

SQL> grant read on directory BFILE_DIR to lunar;

Grant succeeded.

Elapsed: 00:00:00.04

SQL>

3.检查相应的文件是否存在

host ls -l /home/oracle/bfiletest/bfiletest_file.txt

SQL> host ls -l /home/oracle/bfiletest/bfiletest_file.txt

-rw-r--r-- 1 root root 349 Oct 31 2003 /home/oracle/bfiletest/bfiletest_file.txt

SQL>

4.数据操作

BFILENAME函数的语法如下:BFILENAME('directory','filename')

该函数用以返回一个BFILE文件位置指针，指针和文件系统上的LOB binary文件相关联。

'directory' 是路径名，通过create directory方式创建。 'filename' 是文件系统上的文件名称

在你在SQL,PL/SQL或者DBMS_LOG包，或者OCI中使用BFILENAME函数之前，你必须创建相应的directory并且关联相应的物理文件.

以下是一个示例:

CREATE DIRECTORY media_dir AS '/demo/schema/product_media';

create table lunar_test (product_id number, ad_id number, ad_graphic bfile );

INSERT INTO print_media (product_id, ad_id, ad_graphic)

VALUES (3000, 31001, bfilename('MEDIA_DIR', 'modem_comp_ad.gif'));

参考:Oracle9i SQL Reference Release (9.2) Part Number A96540-02

再例如：

SQL> connect lunar/lunar

create table lunar_test (id number, bfiles bfile );

insert into lunar_test values ( 1, bfilename ( 'BFILE_DIR', 'bfiletest_file.txt' ) );

SQL> connect lunar/lunar

Connected.

SQL> create table lunar_test (id number, bfiles bfile );

Table created.

Elapsed: 00:00:00.03

SQL> insert into lunar_test values ( 1, bfilename ( 'BFILE_DIR', 'bfiletest_file.txt' ) );

1 row created.

Elapsed: 00:00:00.00

SQL> commit;

Commit complete.

Elapsed: 00:00:00.00

SQL>

declare

fhandle utl_file.file_type;

begin

fhandle := utl_file.fopen('BFILE_DIR', 'lunartest1.txt', 'w');

utl_file.put_line(fhandle , 'aaa');

utl_file.put_line(fhandle , 'bbb');

utl_file.fclose(fhandle);

end;

declare

fhandle utl_file.file_type;

fp_buffer varchar2(4000);

begin

fhandle := utl_file.fopen ('BFILE_DIR','lunartest1.txt', 'R');

utl_file.get_line (fhandle , fp_buffer );

dbms_output.put_line(fp_buffer );

utl_file.get_line (fhandle , fp_buffer );

dbms_output.put_line(fp_buffer );

utl_file.fclose(fhandle);

end;