oracle创建DIRECTORY目录

ORACLE DIRECTORY目录

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