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 ²Î¼ûÎÒµÄBLOG£ºOracleϵÁУºLOB´ó¶ÔÏó´¦Àí
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 1£¬ÏȲåÈëÆÕͨÊý¾Ý£¬Óöµ½´ó¶ÔÏóÁÐʹÓÃempty_blob()¹¹Ôì¿ÕµÄÖ¸Õë¡£
  Àý×Ó£º
  /*
   conn scott/tiger;
   Create TableSpace ts5_21;
  */
   Create Table MyLob
   (
     no number(8) primary key,
     fname varchar2(30),
     myfile blob
   )
   Lob (myfile) Store As
   (
     Tablespace ts5_21
     Chunk 15K
     Disable Storage In Row
   );
 
  Insert Into MyLob Values(1,'IMG_0210.JPG',empty_blob());
 
 2£¬´´½¨Âß¼­Ä¿Â¼MYDIR
  Create Directory  MYDIR As 'E:\Oracle';
 
 3£¬ÉùÃ÷Ò»¸öBLOBÀàÐͱäÁ¿£¬Ê¹ÓÃselect into Óï¾äÈÃÆäÖ¸Ïòµ½empty_blob()¹¹Ôì¿ÕµÄÖ¸ÕëËùÖ¸ÏòµÄ´æ´¢¿Õ¼ä
    Select myfile Into BLOBÀàÐͱäÁ¿  from myLob Where no = 1 FOR UPDATE;
 
 4£¬ÉùÃ÷Ò»¸öBFileÀàÐͱäÁ¿£¬¹ØÁªÂß¼­Ä¿Â¼ºÍÎïÀíĿ¼Îļþ£¬Ê¹Óà BFileName() ½«ÆäÖ¸Ïòµ½´ý´æ´¢µÄÎļþ¡£
    BFileÀàÐͱäÁ¿ := BFileName('MYDIR','IMG_0210.JPG');
 
 5£¬Ê¹ÓÃDBMS_LOB.open()·½·¨½«BFileÀàÐͱäÁ¿ËùÖ¸ÏòµÄÎļþ´ò¿ª
    DBMS_LOB.Open(BFileÀàÐͱäÁ¿);
 
 6£¬Ê¹ÓÃDBMS_LOB.loadfromfile()·½·¨½«BFileÀàÐͱäÁ¿ËùÖ¸ÏòµÄÎļþ¶ÁÈëµ½BLOBÀàÐͱäÁ¿ËùÖ¸ÏòµÄ´æ´¢¿Õ¼ä
    DBMS_LOB.LoadfromFile(BLOBÀàÐͱäÁ¿,BFileÀàÐͱäÁ¿,DBMS_LOB.getlength(BFileÀàÐͱäÁ¿));
 
 7£¬Ê¹ÓÃDBMS_LOB.close()·½·¨½«bfileµÄ±äÁ¿ËùÖ¸ÏòµÄÎļþ¹Ø±Õ
    DBMS_LOB.Close(BFileÀàÐͱäÁ¿);
 
 8£¬Ìá½»ÊÂÎñ
    Commit;
 
 Àý×Ó;
  Declare
     varB blob;
     varF Bfile;
  Begin
 


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