您的位置：首页 > 数据库 > Oracle

ORACLE directory 目录

2016-04-04 10:30 393 查看

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

http://www.blogjava.net/sterning/archive/2009/01/10/250793.html

内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理

标签：

相关文章推荐

新的分享

章节导航