SQLSERVER之高灵活的业务单据流水号生成

SQLSERVER之高灵活的业务单据流水号生成

最近的工作中要用到流水号,而且业务单据流水号生成的规则分好几种,并非以前那种千篇一律的前缀+日期+流水号的简单形式,经过对业务的分析,以及参考网上程序员的N种方法,整理出了一个表结构和存储过程

思路分析:

1.大体上,流水号都遵循近似这样的一般规则:流水号 = 前缀+动态内容+日期+中缀+流水号+后缀

这里的动态内容是通过参数传入流水号生成存储过程的,比如动态内容为科室+组别,这个科室和组别是动态的,每一张单可能都不同,是根据登录人组织信息得到的

2.流水号生成要控制并发

并发的话,网上资料大多都是加锁提示,比如holdlock,xlock,rowlock等等,但其它人又说最好不要加提示,锁提示,索引提示能不加就不加,因为这个数据库可以自动判断,比如是锁定整张表,还是锁定某几行等等,所以我直接设定了事务级别,我还是没怎么搞清楚到底设置为repeatable read 还是 serializable,经过分析,个人认为还是设定为serializable,即串行化比较保险,相当于所有事务都按队列进行,总是有排序的,但缺点是性能很差,当然也要看情况,一天几张单,几十张单,几百张单就根本不用考虑性能问题了.如果是大型系统,估计也不是这样搞法,至于大型系统是如何搞的,我真不知道(当然很想知道,比如淘宝,当当的订单号是如何生成的???)

其它的还暂未想到,到时候碰到再更改,请各位同行们指点,以求改进

脚本代码如下:

  1  --流水号表
  2  --流水号一般规则:流水号 = 前缀+动态内容+日期+中缀+流水号+后缀。
  3  --动态内容一般是执行存储过程取流水号的时候动态传入的
  4 if object_id('t_sequence_number') is not null
  5    drop table t_sequence_number
  6 go
  7
  8 create table t_sequence_number(
  9   id int identity
 10  ,sequence_type varchar(50) not null                 --哪种类型的流水号,为求方便,默认是表名
 11  ,sequencenumber_len int  not null                   --流水号长度 如长度为4,表示'0000',长度为7,表示'0000000'等等
 12  ,reset_type varchar(50) not null                    --归一类型,'year'表示按年,'month'表示按月,'day'表示按日,归一类型与日期模板三个字段是有约束的,
                                                           如果是day,则年,月,日都不能为空,如果为month,则年月不能为空,如果为'',表示不要日期 
 13  ,separator varchar(50) not null                     --流水号各部分分隔符
 14  ,prefix varchar(50) not null                        --前缀
 15  ,part_year_fmt varchar(50) not null                 --日期模板年份 可以是:yyyy,yy,
 16  ,part_month_fmt varchar(50) not null                --日期模板月份 可以是:mm,m等等
 17  ,part_day_fmt varchar(50) not null                  --日期模板日期 可以是:dd,d等等
 18  ,midfix varchar(50) not null                        --中缀
 19  ,cur_max_sequence_number int not null               --当前最大流水号值
 20  ,cur_max_date datetime null                         --当前最大日期
 21  ,suffix varchar(50) not null                        --后缀
 22
 23  ,constraint uq_t_sequence_number_sequence_type unique (sequence_type)
 24  ,constraint pk_t_sequence_number_id primary key (id)
 25  ,constraint chk_t_sequence_number_reset_type check (reset_type in ('year','month','day',''))
 26  ,constraint chk_t_sequence_number_part_year_fmt check (part_year_fmt in ('yyyy','yy',''))
 27  ,constraint chk_t_sequence_number_part_month_fmt check (part_month_fmt in ('mm','m',''))
 28  ,constraint chk_t_sequence_number_part_day_fmt check (part_day_fmt in ('dd','d',''))
 29  ,constraint chk_t_sequence_number_reset_type_map_fmt 
      check (    reset_type = '' 
              or charindex(left(reset_type,1),isnull(part_year_fmt,'')+isnull(part_month_fmt,'')+isnull(part_day_fmt,''))>0)    
 30  ,constraint chk_t_sequence_number_cur_max_date check (    reset_type = '' 
                                                            or (reset_type<>'' and cur_max_date is not null))
 32 ) 
 33 alter table t_sequence_number
 34 add constraint def_t_sequence_number_sequencenumber_len default 4 for sequencenumber_len
 35
 36 alter table t_sequence_number
 37 add constraint def_t_sequence_number_reset_type default ('day') for reset_type
 38
 39 alter table t_sequence_number
 40 add constraint def_t_sequence_number_separator default ('') for separator
 41
 42 alter table t_sequence_number
 43 add constraint def_t_sequence_number_prefix default ('') for prefix
 44
 45 alter table t_sequence_number
 46 add constraint def_t_sequence_number_part_year_fmt default ('yyyy') for part_year_fmt
 47
 48 alter table t_sequence_number
 49 add constraint def_t_sequence_number_part_month_fmt default ('mm') for part_month_fmt
 50
 51 alter table t_sequence_number
 52 add constraint def_t_sequence_number_part_day_fmt default ('dd') for part_day_fmt
 53
 54 alter table t_sequence_number
 55 add constraint def_t_sequence_number_midfix default ('') for midfix
 56
 57 alter table t_sequence_number
 58 add constraint def_t_sequence_number_cur_max_sequence_number default (0) for cur_max_sequence_number
 59
 60 alter table t_sequence_number
 61 add constraint def_t_sequence_number_cur_max_date default (getdate()) for cur_max_date
 62
 63 alter table t_sequence_number
 64 add constraint def_t_sequence_number_suffix default ('') for suffix
 65
 66 go
 67
 68 if object_id('sp_Get_Sequence_Number') is not null
 69    drop proc sp_Get_Sequence_Number
 70 go
 71
 72 create procedure sp_Get_Sequence_Number
 73   @sequence_type varchar(50)                  --流水号类别
 74  ,@count int = 1                              --获取几个序列号
 75  ,@dynamic_content varchar(50) = ''           --动态内容
 76 as
 77 begin
 78     /*
 79      --流水号一般规则:流水号 = 前缀+动态内容+日期+中缀+流水号+后缀。
 80      --动态内容一般是执行存储过程取流水号的时候动态传入的
 81      插入内容示例:
 82      insert into t_sequence_number(sequence_type,sequencenumber_len,reset_type,separator,prefix,part_year_fmt,
                                       part_month_fmt,part_day_fmt,midfix,cur_max_sequence_number,cur_max_date,suffix)
 83      values('CarApply',4,'day','','LA','yy','mm','dd','',0,getdate(),'')
 84
 85      执行示例:exec sp_Get_Sequence_Number 'CarApply'
 86
 87     */
 88  set nocount on;
 89  set transaction isolation level serializable;
 90
 91  declare   @currentdate datetime
 92           ,@sequencenumber_len int
 93           ,@reset_type varchar(50)
 94           ,@separator varchar(50)
 95           ,@prefix varchar(50)
 96           ,@part_year_fmt varchar(50)
 97           ,@part_month_fmt varchar(50)
 98           ,@part_day_fmt varchar(50)
 99           ,@midfix varchar(50)
100           ,@cur_max_sequence_number int
101           ,@cur_max_sequence_number_firt_bak int
102           ,@cur_max_date datetime
103           ,@suffix varchar(50)
104           ,@datestr varchar(50);
105
106  declare @seqtable table(seqnum varchar(50),orderno int);
107
108  begin tran
109
110  --读取配置信息
111  select    @currentdate = getdate()
112           ,@sequencenumber_len = sequencenumber_len
113           ,@reset_type = reset_type
114           ,@separator = separator
115           ,@prefix = prefix
116           ,@part_year_fmt = isnull(part_year_fmt,0)
117           ,@part_month_fmt = part_month_fmt
118           ,@part_day_fmt = part_day_fmt
119           ,@midfix = midfix
120           ,@cur_max_sequence_number = cur_max_sequence_number
121           ,@cur_max_sequence_number_firt_bak = cur_max_sequence_number
122           ,@cur_max_date=cur_max_date
123           ,@suffix = suffix
124           ,@datestr = ''
125  from t_sequence_number where sequence_type=@sequence_type;
126
127  if @@rowcount = 0
128  begin
129    raiserror('无相应的流水号类别,请确认@sequence_type参数值是否正确!',16,1);
130  end
131
132  if @reset_type<>''
133  begin
134   set @datestr =   case @part_year_fmt 
                            when 'yyyy' then cast(year(getdate()) as varchar(50)) else right(cast(year(getdate()) as varchar(50)),2) end
135                  + case @part_month_fmt 
                            when 'mm' then right('0'+ cast(month(getdate()) as varchar(50)),2) else cast(month(getdate()) as varchar(50)) end
136                  + case @part_day_fmt 
                            when 'dd' then right('0'+ cast(day(getdate()) as varchar(50)),2) else cast(day(getdate()) as varchar(50)) end
137
138  end
139
140  if convert(varchar(8), @currentdate, 112) = convert(varchar(8), @cur_max_date, 112)
141   set @cur_max_sequence_number = @cur_max_sequence_number + @count; --累加
142  else
143  begin
144   set @cur_max_sequence_number = 1; --归1
145   set @cur_max_sequence_number_firt_bak = 0;
146  end
147
148  while @count >=1
149  begin
150   insert into @seqtable values(
151                                 @prefix
152                               + @separator
153                               + @dynamic_content
154                               + case @dynamic_content when '' then '' else @separator end
155                               + @datestr
156                               + case @datestr when '' then '' else @separator end
157                               + @midfix
158                               + case @midfix when '' then '' else @separator end
159                               + right( replicate('0',@sequencenumber_len)
                                          +cast(@cur_max_sequence_number_firt_bak+@count as varchar(50)),@sequencenumber_len)
160                               + case @suffix when '' then '' else @separator end
161                               + @suffix
162                                ,@count
163   )
164
165   set @count = @count - 1;
166
167  end
168
169  update t_sequence_number
170  set  cur_max_date = @currentdate
171      ,cur_max_sequence_number=@cur_max_sequence_number
172  where sequence_type=@sequence_type;
173
174  commit tran
175
176  --获取流水号
177  select seqnum from @seqtable order by orderno asc
178 end