oracle中rollback的使用方法

rollback使用

SQL> create table tbl(name varchar2(10));

 

Table created.

 

SQL> insert into tbl values('zhiqiao');

 

 

1 row created.

 

SQL> select * from tbl;

NAME
----------
zhiqiao

 

SQL> delete tbl;
1 row deleted.

SQL> select * from tbl;

 

no rows selected

 

SQL> rollback;

 

Rollback complete.

 

没有提交(commit)的数据删除后无法rollback

SQL> select * from tbl;

 

no rows selected

 

SQL> insert into tbl values('zhiqiao');

1 row created.

 

SQL> select * from tbl;

 

NAME
----------
zhiqiao

 

SQL> commit;

Commit complete.

SQL> delete tbl;

 

1 row deleted.

 

SQL> select * from tbl;

 

no rows selected

SQL> rollback;

 

 

Rollback complete.

 

提交(commit)了的数据删除后可以使用rollback恢复

SQL> select * from tbl;

 

NAME
----------
zhiqiao

SQL> delete tbl; 

1 row deleted.

 

SQL> commit;

Commit complete.

 

SQL> rollback;

Rollback complete.

删除数据后提交(commit)则无法使用rollback恢复

SQL> select * from tbl;

 

no rows selected