每年在 Oracle 中重置序列

Question

我的表的列（不是主键）有一个序列，每次插入都会递增。

我希望新年的每一天都将该序列重置为值 1。

我已经看到了一些删除和重新创建序列的解决方案。但我想每年安排一次。

这怎么可能？

提前致谢

Answer 1

您可以使用DBMS_SCHEDULER Oracle 包来安排作业。在此处查看更多详细信息：https://docs.oracle.com/cd/B28359_01/server.111/b28310/scheduse.htm

创建一个重置序列的过程，并将该过程作为每年的计划作业运行。以下是此类过程的示例：How do I reset a sequence in Oracle?

Answer 2

试试我自己的程序

    create or replace procedure reset_seq_hh_ww(p_seq_name in varchar2,
                                            num_seq    in Number) is
  l_val     number;
  curr_se   number;
  min_l_val number;
begin

  execute immediate 'select ' || p_seq_name || '.nextval from dual'
    INTO l_val;
  DBMS_OUTPUT.PUT_LINE('1-l_val='||l_val);
  if l_val > num_seq then
    min_l_val := -1 * l_val;
    
    execute immediate
    
     'alter sequence ' || p_seq_name || ' increment by ' ||  min_l_val || ' minvalue 0';
      DBMS_OUTPUT.PUT_LINE('alter sequence ' || p_seq_name || ' increment by ' ||  min_l_val || ' minvalue 0');

  
  
    execute immediate
    
     'select ' || p_seq_name || '.nextval from dual'  INTO l_val;
     DBMS_OUTPUT.PUT_LINE('select ' || p_seq_name || '.nextval from dual');
     DBMS_OUTPUT.PUT_LINE('2-min_l_val='||min_l_val);
    
    DBMS_OUTPUT.PUT_LINE('3-l_val='||l_val);
    

    curr_se := num_seq-1;
    if curr_se=0 then curr_se:=2-num_seq;
    else
     curr_se := num_seq-1;
     end if; 
    DBMS_OUTPUT.PUT_LINE('4-curr_se='||curr_se);
    
    
  else
  
    curr_se := num_seq - l_val-1;
    if curr_se =0 then curr_se:=curr_se+num_seq;
    else
      curr_se:=curr_se;
      end if;
    DBMS_OUTPUT.PUT_LINE('5-curr_se='||curr_se);
  end if;
  execute immediate
  /*'alter sequence ' || p_seq_name || ' increment by -' || l_val ||
                                                            ' minvalue 0';
          DBMS_OUTPUT.PUT_LINE (l_val);
  
  
            execute immediate*/
   'alter sequence ' || p_seq_name || ' increment by ' || curr_se ||
   ' minvalue 0';
  DBMS_OUTPUT.PUT_LINE('6-l_val='||l_val);

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

  DBMS_OUTPUT.PUT_LINE('7-l_val='||l_val);

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