Using Create directory & UTL_FILE in Oracle

« Jonathan Lewis: Can we have a sensible debate ? | Blog首页 | Solaris Open File Limit »

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

历史上的今天...
>> 2020-04-22文章:

Oracle 20c 新特性： EXCEPT 运算符和ANSI SQL 全支持

>> 2016-04-22文章:

2016 ACOUG Asia Tour 合肥站 - 传道授业三人有师

>> 2013-04-22文章:

四川雅安抗御灾难众目所瞩

>> 2009-04-22文章:

Oracle EXP/IMP与临时对象的管理方式

李宗盛、罗大佑 - 两个青春偶像挥不去

RMAN结合Read Only、Exclude的备份策略

>> 2008-04-22文章:

如何对时间进行简单加减运算