ORACLE 导入导出 删除某个用户下的对象

1 exp XXX/XXX@XXXX tables=(xxxx) file=c:\xxx.dmp query="where birthday>= to_date('1980.12.18','yyyy-mm-dd')"
IMP时,注意导入时,用参数ignore=yes query=\"where rownum\<=2400\"

exp user/password@dbname TABLES=tablename FILE=d:\expout\filename.dmp
imp user/password@dbname TABLES=tablename FILE=d:\expout\filename.dmp

exp aichannel/aichannel@TESTDB2 file= d:\data\newsmgnt.dmp tables=(inner_notify,notify_staff_relat)
imp system/manager@TEST file=d:\daochu.dmp tables=(table1)

--删除某个用户下的对象  
set heading off;  
set feedback off;  
spool c:\dropobj.sql;  
  prompt --Drop constraint  
select 'alter table '||table_name||' drop constraint '||constraint_name||' ;' from user_constraints where constraint_type='R';  
prompt --Drop tables  
select 'drop table '||table_name ||';' from user_tables;   
   
prompt --Drop view  
select 'drop view ' ||view_name||';' from user_views;  
   
prompt --Drop sequence  
select 'drop sequence ' ||sequence_name||';' from user_sequences;   
   
prompt --Drop function  
select 'drop function ' ||object_name||';'  from user_objects  where object_type='FUNCTION';  
 
prompt --Drop procedure  
select 'drop procedure '||object_name||';' from user_objects  where object_type='PROCEDURE';  
   
prompt --Drop package  
prompt --Drop package body  
select 'drop package '|| object_name||';' from user_objects  where object_type='PACKAGE';  
 
prompt --Drop database link  
select 'drop database link '|| object_name||';' from user_objects  where object_type='DATABASE LINK';  
   
spool off;  
set heading on;  
set feedback on;  
 
@@c:\dropobj.sql;  
host del c:\dropobj.sql; 

--删除某个用户下的对象
set heading off;
set feedback off;
spool c:\dropobj.sql;
  prompt --Drop constraint
select 'alter table '||table_name||' drop constraint '||constraint_name||' ;' from user_constraints where constraint_type='R';
prompt --Drop tables
select 'drop table '||table_name ||';' from user_tables;

prompt --Drop view
select 'drop view ' ||view_name||';' from user_views;

prompt --Drop sequence
select 'drop sequence ' ||sequence_name||';' from user_sequences;

prompt --Drop function
select 'drop function ' ||object_name||';'  from user_objects  where object_type='FUNCTION';

prompt --Drop procedure
select 'drop procedure '||object_name||';' from user_objects  where object_type='PROCEDURE';

prompt --Drop package
prompt --Drop package body
select 'drop package '|| object_name||';' from user_objects  where object_type='PACKAGE';

prompt --Drop database link
select 'drop database link '|| object_name||';' from user_objects  where object_type='DATABASE LINK';

spool off;
set heading on;
set feedback on;

@@c:\dropobj.sql;
host del c:\dropobj.sql;


注释：
1.上面这个语句，在pl/sql里面是放在命令里面执行的。
2.set heading off; 意思就是关闭表头。如果不关闭，写入dropobj.sql文件中就会带有结果集的表头如：
'DROPTABLE'||TABLE_NAME||';'
------------------------------------------
drop table TEACHER;
实际上我们需要的是“drop table TEACHER;”，“'DROPTABLE'||TABLE_NAME||';'
”就是表头。
3.set feedback off; 意思就是关闭回显。如果不关闭，写入dropobj.sql文件中就会带有返回结果集的大小等信息，如："137 rows selected"
4.spool c:\dropobj.sql; 把结果集写入这个文件。spool off; 结束写入。
5.@@c:\dropobj.sql; 执行这个sql
6.host del c:\dropobj.sql; 删除主机上这文件。
7.CONSTRAINT_TYPE 就是键的类型：
Sql代码 
C (check constraint on a table)   
P (primary key)   
U (unique key)  
R (referential integrity)  
V (with check option, on a view)  
O (with read only, on a view) 

C (check constraint on a table)
P (primary key)
U (unique key)
R (referential integrity)
V (with check option, on a view)
O (with read only, on a view)

8.当执行'drop package ………… '这句时，package body会被同时删除。