Oracle重置序列

oracle序列创建以后,如果想重置序列从 0 开始,逐渐递增1,可以采用如下存储过程:

 1 create or replace
 2 procedure reset_seq( p_seq_name in varchar2 )
 3 is
 4     l_val number;
 5 begin
 6     execute immediate
 7     'select ' || p_seq_name || '.nextval from dual' INTO l_val;
 8 
 9     execute immediate
10     'alter sequence ' || p_seq_name || ' increment by -' || l_val || 
11                                                           ' minvalue 0';
12 
13     execute immediate
14     'select ' || p_seq_name || '.nextval from dual' INTO l_val;
15 
16     execute immediate
17     'alter sequence ' || p_seq_name || ' increment by 1 minvalue 0';
18 end;

存储过程创建以后,调用该存储过程,参数是要重置的序列名称:

call reset_seq(‘test_seq’);

使用下面的SQL语句查询需要重置的序列:

 1 SELECT  a.sequence_name 序列名称,
 2 a.min_value 序列最小值,
 3 to_char(to_number( a.max_value)) 序列最大值,
 4 a.last_number 序列当前值,
 5 CASE  a.last_number WHEN 1 THEN '--不需要重置;' ELSE 
 6 'CALL seq_reset(''' || a.sequence_name || ''');' END 重置序列脚本,
 7 'DROP SEQUENCE ' || a.sequence_name 删除序列脚本,
 8 'RENAME ' || a.sequence_name || ' TO {newname}'  重命名脚本
 9 FROM USER_SEQUENCES a WHERE a.last_number<>1
10 ORDER BY a.sequence_name ASC;

重置序列脚本这列查询出来的值就是调用存储过程重置序列的SQL语句,直接执行SQL将重置序列。

posted @ 2017-01-19 09:48  .NET开发菜鸟  阅读(5166)  评论(0编辑  收藏  举报