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ORACLE directory 目录

ORACLE directory 目录

Posted on 2009-01-10 11:48 诗特林 阅读(5141) 评论(2) 编辑 收藏 所属分类: Oracle 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

来自 “ ITPUB博客 ” ,链接:http://blog.itpub.net/27042095/viewspace-732596/,如需转载,请注明出处,否则将追究法律责任。

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