查看表结构
SQL> desc dba_objects
Name Type Nullable Default Comments
-------------- ------------- -------- ------- ----------------------------------------------------------------------------
OWNER VARCHAR2(30) Y Username of the owner of the object
OBJECT_NAME VARCHAR2(128) Y Name of the object
SUBOBJECT_NAME VARCHAR2(30) Y Name of the sub-object (for example, partititon)
OBJECT_ID NUMBER Y Object number of the object
DATA_OBJECT_ID NUMBER Y Object number of the segment which contains the object
OBJECT_TYPE VARCHAR2(19) Y Type of the object
CREATED DATE Y Timestamp for the creation of the object
LAST_DDL_TIME DATE Y Timestamp for the last DDL change (including GRANT and REVOKE) to the object
TIMESTAMP VARCHAR2(19) Y Timestamp for the specification of the object
STATUS VARCHAR2(7) Y Status of the object
TEMPORARY VARCHAR2(1) Y Can the current session only see data that it place in this object itself?
GENERATED VARCHAR2(1) Y Was the name of this object system generated?
SECONDARY VARCHAR2(1) Y Is this a secondary object created as part of icreate for domain indexes?
NAMESPACE NUMBER Y Namespace for the object
EDITION_NAME VARCHAR2(30) Y Name of the edition in which the object is actual
创建测试表
create table system.test as select * from dba_objects
查看表数据
select * from system.test where object_id = 39
1 SYS I_OBJ4 39 39 INDEX 2011/9/17 9:46:13 2011/9/17 9:46:13 2011-09-17:09:46:13 VALID N N N 4
定位 system.test object_id =39 的数据块
begin
exec get_dump('system','test','OBJECT_NAME','object_id=39');
end
/
I_OBJ4 Typ=1 Len=6: 73,95,79,66,74,52 Typ=1 Len=6: 49,5f,4f,42,4a,34
我们再看一下 LAST_DDL_TIME 的内容, col 7: [ 7] 78 6f 09 11 0a 2f 0e
begin
exec get_charrowvalue('495f4f424a34','c');
end
/
I_OBJ4
PL/SQL procedure successfully completed
col 7: [ 7] 78 6f 09 11 0a 2f 0e
根据上面记录进行一下查询
begin
exec<span font-size:14px;background-color:#ffffff;"="" style="word-wrap: break-word; white-space: pre; color: rgb(51, 51, 51);"> get_daterowvalue('786f09110a2f0e','d');
end
/
2011-09-17 09:46:13
PL/SQL procedure successfully completed
得到了正确数值
