Using Create directory & UTL_FILE in Oracle

作者:eygle
出處:http://www.eygle.com/blog
日期:April 22, 2005
瀏覽次數: 本文連結:

Create directory讓我們可以在Oracle資料庫中靈活的對檔案進行讀寫操作，極大的提高了Oracle的易用性和可擴充套件性。
其語法為:



create or replace directory exp_dir as '/tmp';

目錄建立以後，就可以把讀寫許可權授予特定使用者，例如:



grant read, write on directory exp_dir to eygle;

此時使用者eygle就擁有了對該目錄的讀寫許可權。

讓我們看一個簡單的測試:



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]$

類似的我們可以透過utl_file來讀取檔案:



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.

可以查詢dba_directories檢視所有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刪除這些路徑.



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

Using Create directory & UTL_FILE in Oracle

Using Create directory & UTL_FILE in Oracle

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