Oracle的UTL_FILE.FOPEN学习笔记

Oracle提供的文件操作包UTL_FILE包中的UTL_FILE.FOPEN负责打开一个文件。

UTL_FILE.FOPEN(location in varchar2, filename in varchar2, open_mode in varchar2) return FILE_TYPE;
Location 是路径参数，
FILENAME 是文件名，
OPEN_MODE是打开模式，‘R‘是读文本，‘W‘是写文本，‘A‘是附加文本，参数不分大小写，如果指定‘A‘但是文件不存在，它会用‘W‘先创建出来，‘W‘有覆盖的功能；

其中的location并不能简单的指定为‘D:\temp‘等路径，要建立一个DIRECTORY变量并付给权限（必须以DBA身份登录）：

Sql代码
create or replace directory D_OUTPUT as ‘D:\TEMP‘;
grant read,write on directory D_OUTPUT to testdb;
GRANT EXECUTE ON utl_file TO testdb;  

之后就可以用UTL_FILE包建立文件了

Sql代码
V_FILE UTL_FILE.FILE_TYPE;
V_FILE := UTL_FILE.FOPEN(‘D_OUTPUT‘, ‘Data.txt‘, ‘w‘);  

就可以在数据库服务器的D:\TEMP建立Data.txt

源文档 <http://lveyo.javaeye.com/blog/351416>
create or replace procedure PRO_TO_TXT(FILE_OWNER   VARCHAR2,FILE_NAME   VARCHAR2)
is
    file_handle   utl_file.file_type;
    STOR_TEXT   VARCHAR2(4000);
    N   NUMBER;
I   NUMBER;
begin
I:=1;
      SELECT   MAX(LINE)   INTO   N   FROM   ALL_SOURCE   WHERE   OWNER=‘‘ || FILE_OWNER || ‘‘  AND   NAME=‘‘ || FILE_NAME || ‘‘   AND   TYPE= ‘PROCEDURE‘;
file_handle:=utl_file.fopen( ‘/oradata/procedure_bak‘, ‘zhfx117.txt‘, ‘A‘);
utl_file.put_line(file_handle, ‘PROCEDURE   NAME: ‘||FILE_NAME);
WHILE   I <=N   LOOP
      SELECT   TEXT     INTO   STOR_TEXT   FROM   ALL_SOURCE   WHERE   OWNER=FILE_OWNER
AND   NAME=FILE_NAME   AND   TYPE= ‘PROCEDURE‘   AND   LINE= I;
      I:=I+1;
      utl_file.put_line(file_handle,stor_text);
END   LOOP;
      utl_file.fclose(file_handle);
commit;
end   PRO_TO_TXT;