Create directory让我们可以在Oracle数据库中灵活的对文件进行读写操作，极大的提高了Oracle的易用性和可扩展性。

其语法为:

CREATE [OR REPLACE] DIRECTORY directory AS 'pathname';

本案例具体创建如下:

create or replace directory exp_dir as '/tmp';

目录创建以后，就可以把读写权限授予特定用户，具体语法如下:

GRANT READ[,WRITE] ON DIRECTORY directory TO username;

例如:

grant read, write on directory exp_dir to eygle;

此时用户eygle就拥有了对该目录的读写权限。

让我们看一个简单的测试:

SQL> create or replace directory UTL_FILE_DIR as '/opt/oracle/utl_file';

Directory created.

SQL> declare

2 fhandle utl_file.file_type;

3 begin

4 fhandle := utl_file.fopen('UTL_FILE_DIR', 'example.txt', 'w');

5 utl_file.put_line(fhandle , 'eygle test write one');

6 utl_file.put_line(fhandle , 'eygle test write two');

7 utl_file.fclose(fhandle);

8 end;

9 /

PL/SQL procedure successfully completed.

SQL> !

[oracle@jumper 9.2.0]$ more /opt/oracle/utl_file/example.txt

eygle test write one

eygle test write two

[oracle@jumper 9.2.0]$

类似的我们可以通过utl_file来读取文件:

SQL> declare

2 fhandle utl_file.file_type;

3 fp_buffer varchar2(4000);

4 begin

5 fhandle := utl_file.fopen ('UTL_FILE_DIR','example.txt', 'R');

6

7 utl_file.get_line (fhandle , fp_buffer );

8 dbms_output.put_line(fp_buffer );

9 utl_file.get_line (fhandle , fp_buffer );

10 dbms_output.put_line(fp_buffer );

11 utl_file.fclose(fhandle);

12 end;

13 /

eygle test write one

eygle test write two

PL/SQL procedure successfully completed.

可以查询dba_directories查看所有directory.

SQL> select * from dba_directories;

OWNER DIRECTORY_NAME DIRECTORY_PATH

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

SYS UTL_FILE_DIR /opt/oracle/utl_file

SYS BDUMP_DIR /opt/oracle/admin/conner/bdump

SYS EXP_DIR /opt/oracle/utl_file

可以使用drop directory删除这些路径.

SQL> drop directory exp_dir;

Directory dropped

SQL> select * from dba_directories;

OWNER DIRECTORY_NAME DIRECTORY_PATH

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

SYS UTL_FILE_DIR /opt/oracle/utl_file

SYS BDUMP_DIR /opt/oracle/admin/conner/bdump

本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/xiaoxu0123/archive/2010/03/20/5398230.aspx

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