如何防止SQL存儲過程

Question

我有這個表Sql和插入Form重複更新我阻止用戶進入同一HDate爲同一HNumber

RecID  HDate  HNumber  HComb 
---------------------------------------------- 
1   2017-1-30  1   12 
3   2017-1-29  1   15 
5   2017-1-30  2   12 
6   2017-1-30  3   12 
9   2017-1-30  4   12 

但在編輯表單我不」知道如何防止這種情況，

我嘗試在存儲過程的代碼，但它的一些HNumber工作，但它防止一些其他HNumber在它自己的日期進行編輯

Create Procedure UpdCombHarByRecID 

@RecID int, 
@HarvestDate Date, 
@HiveNumber int, 
@HoneyComb Float, 

as 

if NOT Exists (Select * From tHoneyHarvest Where RecID=@RecID) 
return 0 
//there is no record to be updated 

if Exists (Select * From tHoneyHarvest Where HarvestDate=@HarvestDate AND 
HiveNumber=HiveNumber And 
RecID!=@RecID) 
// I hoped this should do the job 
//(RecID is PrimaryKey and it is identity) 
return 2 

Update tHoneyHarvest 

Set HarvestDate=@HarvestDate, 
HoneyType=@HoneyType, 
HoneyComb=@HoneyComb, 
HoneyDetails=@HoneyDetails 

Where RecID=@RecID 
return 1 

現在問題在哪裏？

Answer 1

坦克在評論的幫助下，問題是在過程的思念型

if Exists (Select * From tHoneyHarvest Where HarvestDate=@HarvestDate AND 
    HiveNumber=@HiveNumber And 
    RecID!=@RecID) 

我忘了添加@ befor HiveNumber

Answer 2

的最好辦法是使用非聚集索引。非聚簇索引防止插入或更新時將發生重複記錄。

CREATE UNIQUE INDEX MyIndex ON ExcelTable(HDate, HNumber) 

請參考

• https://supportline.microfocus.com/documentation/books/sx50/rhsqlx1s.htm

  Add unique constraint to combination of two columns