【Oracle】PL/SQL制作唯一标识，固定字段+日期+流水码，流水码每日重置

【Oracle】PL/SQL制作唯一标识，固定字段+日期+流水码，流水码每日重置

首先创建序列

create sequence sequence_name
minvalue 0
maxvalue 9999999999999999999999999999
start with 0
increment by 1
cache 20;

对序列进行重置存储过程

create or replace procedure update_nextval as
  n    integer;
  tsql varchar2(100);
begin
  execute immediate 'select sequence_name.nextval from dual'
    into n;
  n := -(n);
  tsql := 'alter sequence sequence_name increment by ' || n;
  execute immediate tsql;
  execute immediate 'select sequence_name.nextval from dual'
    into n;
  tsql := 'alter sequence sequence_name increment by 1';
  execute immediate tsql;
end;

将重置序列加入到定时任务job中

declare
  job number;
BEGIN
  DBMS_JOB.SUBMIT(
        JOB => job,  /*自动生成JOB_ID，放着就行，不用管*/
        WHAT => 'update_nextval;',
        INTERVAL => 'TRUNC(SYSDATE + 1)'
      );
  commit;
end;

拼接TEXT+日期+流水码的格式的标识

create or replace procedure code_pro is

  p_seq     integer;
  p_date    varchar2(50);
  p_seqcode varchar2(50);
  p_code    varchar2(50);

begin
--组合成TEXT+日期+流水码的格式的标识
    p_seq := sequence_name.nextval;

    select lpad(p_seq, '3', '0') into p_seqcode from dual;

    select replace(to_char(sysdate, 'yyyy-mm-dd'), '-', '')
      into p_date
      from dual;

    p_code := 'TEXT-' || p_date || '-' || p_seqcode;

    dbms_output.put_line(p_zddh);

end;

这样就制作了一个每天都会更新流水码的标识

使用的话，java就call包，将存储过程改成函数或者作相应调整即可，sql就配合需求修改下存储过程里面的内容即可