標籤：
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的易用性和可擴充性。
其文法為:
CREATE [OR REPLACE] DIRECTORY directory AS ‘pathname‘;
本案例具體建立如下:
create or replace directory exp_dir as ‘/tmp‘;
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目錄建立以後，就可以把讀寫權限授予特定使用者，具體文法如下:
GRANT READ[,WRITE] ON DIRECTORY directory TO username;
例如:
grant read, write on directory exp_dir to eygle;
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此時使用者eygle就擁有了對該目錄的讀寫權限。
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> ! [[email protected] 9.2.0]$ more /opt/oracle/utl_file/example.txt eygle test write one eygle test write two [[email protected] 9.2.0]$
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類似的我們可以通過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.
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可以查詢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
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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
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(3)、如何查詢可用的目錄？
可以使用如下SQL查詢具有READ和WRITE許可權的目錄：
SET lines 80
COL grantee FORMAT a20
COL privilege FORMAT a10
SELECT directory_name, grantee, privilege
FROM user_tab_privs t, all_directories d
WHERE t.table_name(+)=d.directory_name
ORDER BY 1,2,3;
oracle direction目錄
