对T-SQL代码进行优化的一个例子(完全抛弃游标,行数减少了十部)

** 原代码: **

** /* ** ** 福建公安高等专科学校当月无补助有前期补助的卡实现在窗机上领取 ** ** T-SQL ** ** 代码(当月补助形成后发放前处理的) ** ** */

**

declare @month/* 月份 / datetime,@k / 卡类别 / int,@customerid int / 客户号 /, @subsidyfare/ 补助额 */ money

select top 1 @month= month from t_subsidymonth order by month desc/* 获取补助当月份值 */

declare k cursor for select cardtype from t_subsidymonth where plancount=0 and month=@month

open k

fetch next from k into @k

while (@@fetch_status=0)

begin

declare custid_dist cursor for select distinct customerid from t_subsidynotputout where cardtype=@k

open custid_dist

fetch next from custid_dist into @customerid

while (@@fetch_status=0)

begin

insert into t_subsidymonthplan(month,customerid,cardtype,subsidy) values(@month,@customerid,@k,0) – 关键

fetch next from custid_dist into @customerid

end

close custid_dist

deallocate custid_dist

declare custid_subsidyfare cursor for select customerid,sum(subsidy) as sum_subsidy from t_subsidynotputout where cardtype=@k group by customerid

open custid_subsidyfare

fetch next from custid_subsidyfare into @customerid,@subsidyfare

while (@@fetch_status=0)

begin

update t_customers set subsidydt=@month ,cursubsidyfare=@subsidyfare,subsidyout='F' where customerid =@customerid – 关键

fetch next from custid_subsidyfare into @customerid,@subsidyfare

end

close custid_subsidyfare

deallocate custid_subsidyfare

fetch next from k into @k

end

close k

deallocate k

优化后代码:

declare @month/月份/ datetime

select top 1 @month= month from t_subsidymonth order by month desc/获取补助当月份值/

update t_customers set t_customers.subsidydt=@month ,t_customers.cursubsidyfare=l.sum_subsidy ,t_customers.subsidyout='F' from ( select customerid,sum(subsidy) as sum_subsidy from t_subsidynotputout where cardtype in (select cardtype from t_subsidymonth where plancount=0 and month=@month ) group by customerid) as l
where t_customers.customerid=l.customerid

insert into t_subsidymonthplan(month,customerid,cardtype,subsidy) select subsidydt,customerid,cardtype,0 as subsidyfare from t_customers where customerid in (select distinct customerid from t_subsidynotputout where cardtype in (select cardtype from t_subsidymonth where plancount=0 and month=@month ))

附:用到的基本表信息

表名: T_Customers(客户信息)


字段名

|

类型

|

意义

|

是否主键

[CustomerID]

|

[int] NOT NULL

|

客户代码

|

Y

[StatCode]

|

[varchar] (3) NOT NULL

|

工作站代码

|

[Account]

|

[varchar] (7) NOT NULL

|

单位代码

|

[Name]

|

[varchar] (12) NOT NULL

|

姓名

|

[CardNo]

|

[int] NOT NULL

|

卡号

|

[CardType]

|

[tinyint] NOT NULL

|

卡类别

|

[Status]

|

[tinyint] NOT NULL

|

状态

|

[OpenDt]

|

[datetime] NOT NULL

|

操作日期

|

[CashID]

|

[smallint] NOT NULL

|

出纳员代码

|

[SumFare]

|

[smallmoney] NOT NULL

|

总额

|

[ConsumeFare]

|

[smallmoney] NOT NULL

|

消费额

|

[OddFare]

|

[smallmoney] NOT NULL

|

余额

|

[OpCount]

|

[int] NOT NULL

|

操作次数

|

[CurSubsidyFare]

|

[smallmoney] NOT NULL

|

本月补助费

|

[SubsidyDT]

|

[datetime] NOT NULL

|

补助日期

|

[SubsidyOut]

|

[char] (1) NOT NULL

|

发放标记

|

[Alias]

|

[varchar] (10) NULL

|

别名

|

[outid]

|

[varchar] (16) NULL

|

工号

|

[UpdateID]

|

[tinyint] NOT NULL

|

是否更新标记

|

[Pwd]

|

[char] (4) NULL

|

密码

|

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