如何将 Oracle DB 中的所有序列重置为值 0？

Posted 2023-03-28

【中文标题】如何将 Oracle DB 中的所有序列重置为值 0？

【英文标题】：How can I reset all sequences in my Oracle DB to value 0?

【发布时间】：2019-02-01 10:45:44

【问题描述】：

我想将所有序列重置为 0。这在某种程度上不起作用。能说说为什么吗？

create or replace
procedure reset_seq( p_seq_name in varchar2 )
is
    l_val number;
begin
    execute immediate
    'select ' || p_seq_name || '.nextval from dual' INTO l_val;

    execute immediate
    'alter sequence ' || p_seq_name || ' increment by -' || l_val || 
                                                          ' minvalue 0';

    execute immediate
    'select ' || p_seq_name || '.nextval from dual' INTO l_val;

    execute immediate
    'alter sequence ' || p_seq_name || ' increment by 1 minvalue 0';
end;
/

此脚本来自堆栈溢出，适用于单个序列。

begin
for i in (select sequence_name from dba_sequences where sequence_name like '%SEQ_PR%') LOOP
execute immediate 'reset_seq('||i.sequence_name||')';
end loop;
end;
/

这是我自己写的：）

错误报告 - ORA-00900: 无效的 SQL 语句 ORA-06512: 在第 3 行 00900. 00000 - “无效的 SQL 语句”

【参考方案1】：

您不需要动态 SQL。

begin
for i in (select sequence_name from dba_sequences where sequence_name like '%SEQ_PR%') LOOP
  reset_seq(i.sequence_name);           --> this is just fine
end loop;
end;
/

示例（我改用USER_SEQUENCES）：

SQL> select seq_pr1.nextval from dual;

   NEXTVAL
----------
         9

SQL> select seq_pr2.nextval from dual;

   NEXTVAL
----------
         8

SQL> begin
  2  for i in (select sequence_name from user_sequences where sequence_name like '%SEQ_PR%') LOOP
  3    reset_seq(i.sequence_name);
  4  end loop;
  5  end;
  6  /

PL/SQL procedure successfully completed.

SQL> select seq_pr1.nextval from dual;

   NEXTVAL
----------
         1

SQL> select seq_pr2.nextval from dual;

   NEXTVAL
----------
         1

SQL>