ORACLE directory 目錄Posted on 2009-01-10 11:48
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OracleCreate directory讓我們可以在Oracle數據庫中靈活的對文件進(jìn)行讀寫(xiě)操作，極大的提高了Oracle的易用性和可擴展性。
其語(yǔ)法為:
CREATE [OR REPLACE] DIRECTORY directory AS 'pathname';
本案例具體創(chuàng )建如下:
create or replace directory exp_dir as '/tmp';
目錄創(chuàng )建以后，就可以把讀寫(xiě)權限授予特定用戶(hù)，具體語(yǔ)法如下:
GRANT READ[,WRITE] ON DIRECTORY directory TO username;
例如:
grant read, write on directory exp_dir to eygle;
此時(shí)用戶(hù)eygle就擁有了對該目錄的讀寫(xiě)權限。
讓我們看一個(gè)簡(jiǎn)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(lèi)似的我們可以通過(guò)utl_file來(lái)讀取文件:
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.
可以查詢(xún)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
