Oracle实用小技巧

1、 闪回

批注：delete “T_SPC_ROOM”表，但没有commit可以用以下命令还原回来。

<span style="color:#000099;">flashback table MW_APP.T_SPC_ROOM to before drop</span>

2、处理特殊字符

批注：插入带有&等特殊时，Oracle提示为变量。有以下两种方法：

<span style="color:#000099;">select 'abc'||chr(38)||'efg' from dual;
select 'abc'||'&'||'efg' from dual;</span>

3. 导入或导出

说明：导入或导出一张表

<span style="color:#000099;">imp system/[email protected] file=e:\datatable\t_pub_tables.dmp fromuser=(mw_app) touser=(mw_app) 

exp system/[email protected] tables=mw_app.T_MAINTAIN_UNIT file=e:\T_MAINTAIN_UNIT121101.dmp log=e:\T_MAINTAIN_UNIT121105.log</span>

4. 删除当年用户下某类对象

--delete all tables
select 'drop table ' || table_name ||';'||chr(13)||chr(10) from user_tables;   

--delete all views
select 'drop view ' || view_name||';'||chr(13)||chr(10) from user_views;   

--delete all seqs
select 'drop sequence ' || sequence_name||';'||chr(13)||chr(10) from user_sequences;  

--delete all functions
select 'drop function ' || object_name||';'||chr(13)||chr(10) from user_objects where object_type='FUNCTION';   

--delete all procedure
select 'drop procedure ' || object_name||';'||chr(13)||chr(10) from user_objects where object_type='PROCEDURE';   

--delete all package
select 'drop package ' || object_name||';'||chr(13)||chr(10) from user_objects where object_type='PACKAGE';