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使用dbms_rowid包获得rowid的详细信息

Rowid中包含了记录的详细信息，通过dbms_rowid包可以获得这些信息.本文通过一个定义自定义函数介绍该package的使用.

create or replace function get_rowid
(l_rowid in varchar2)
return varchar2
is
ls_my_rowid  varchar2(200);          
rowid_type  number;          
object_number  number;          
relative_fno  number;          
block_number  number;          
row_number  number;  
begin
 dbms_rowid.rowid_info(l_rowid,rowid_type,object_number,relative_fno, block_number, row_number);          
 ls_my_rowid := 'Object# is      :'||to_char(object_number)||chr(10)||
  'Relative_fno is :'||to_char(relative_fno)||chr(10)||
  'Block number is :'||to_char(block_number)||chr(10)||
  'Row number is   :'||to_char(row_number);
 return ls_my_rowid ;
end;          
/
                      

我们看一下其用法:

[oracle@jumper tools]$ sqlplus scott/tiger

SQL*Plus: Release 9.2.0.4.0 - Production on Sun Nov 7 12:30:19 2004

Copyright (c) 1982, 2002, Oracle Corporation.  All rights reserved.


Connected to:
Oracle9i Enterprise Edition Release 9.2.0.4.0 - Production
With the Partitioning option
JServer Release 9.2.0.4.0 - Production

SQL> set echo on
SQL> @f_get_rowid
SQL> create or replace function get_rowid
  2  (l_rowid in varchar2)
  3  return varchar2
  4  is
  5  ls_my_rowid        varchar2(200);
  6  rowid_type number;
  7  object_number      number;
  8  relative_fno       number;
  9  block_number       number;
 10  row_number number;
 11  begin
 12   dbms_rowid.rowid_info(l_rowid,rowid_type,object_number,relative_fno, block_number, row_number);
 13   ls_my_rowid := 'Object# is         :'||to_char(object_number)||chr(10)||
 14                  'Relative_fno is :'||to_char(relative_fno)||chr(10)||
 15                  'Block number is :'||to_char(block_number)||chr(10)||
 16                  'Row number is   :'||to_char(row_number);
 17   return ls_my_rowid ;
 18  end;
 19  /

Function created.

SQL> 
SQL> select * from dept;

    DEPTNO DNAME          LOC
---------- -------------- -------------
        10 ACCOUNTING     NEW YORK
        20 RESEARCH       DALLAS
        30 SALES          CHICAGO
        40 OPERATIONS     BOSTON

SQL> select rowid,a.* from dept a;

ROWID                  DEPTNO DNAME          LOC
------------------ ---------- -------------- -------------
AAABiPAABAAAFRSAAA         10 ACCOUNTING     NEW YORK
AAABiPAABAAAFRSAAB         20 RESEARCH       DALLAS
AAABiPAABAAAFRSAAC         30 SALES          CHICAGO
AAABiPAABAAAFRSAAD         40 OPERATIONS     BOSTON


SQL> col row_id for a60
SQL> select get_rowid('AAABiPAABAAAFRSAAA') row_id from dual;

ROW_ID
------------------------------------------------------------
Object# is      :6287
Relative_fno is :1
Block number is :21586
Row number is   :0


SQL> select get_rowid('AAABiPAABAAAFRSAAB') row_id from dual;

ROW_ID
------------------------------------------------------------
Object# is      :6287
Relative_fno is :1
Block number is :21586
Row number is   :1


SQL>        

By eygle on 2004-12-16 15:40 | Comments (0) | SQL.PLSQL | 109 |

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