[原]将Oracle 中的blob导出到文件中

      直接上代码：

declare
  l_directory varchar(200) := '__dir__';
	l_file UTL_FILE.FILE_TYPE;  
	l_buffer RAW(32767);  
	l_amount BINARY_INTEGER:=32767;  
	l_pos NUMBER:=1;  
	l_Blob Blob;  
	l_Blob_len Number;  
	l_lob_id number;
	CURSOR cur is 
	  select __id__ from __table_name__;
BEGIN  
  open cur;
	loop
	  fetch cur into l_lob_id;
	  EXIT when cur%NOTFOUND; 
	  select __blob_fild__ into l_Blob from __table_name__ where __id__=l_lob_id ; 
	  l_file:=UTL_FILE.FOPEN(l_directory,'adapter_blob.'||to_char(l_lob_id)||'.bin','wb',32767); 
	  l_Blob_len:=dbms_lob.getlength(l_Blob);  
	  l_pos := 1;
	  WHILE l_pos