SQL语句使用总结(二)

一、C#组合查询的便捷方法。

object objImportDateFrom = DBNull.Value;


 if (importDateFrom != "")

  {

     objImportDateFrom = importDateFrom;

  }


   new SqlParameter("@ProductSaleTimeFrom",ObjproductSaleTimeFrom),

  new SqlParameter("@ProductSaleTimeTo",productSaleTimeTo),

...................................

//sql存储过程

CREATE PROCEDURE [dbo].[UP_ProductFocus_SalesStatistics]  

    @Code nvarchar(10)='',  

   @ProductCreateTimeFrom DATETIME=null,--导入系统时间    

   @ProductCreateTimeTo DateTime=null

as  

begin  

AND (@SearchCodeList='' OR cn.Code  IN (Select * From dbo.fun_split(@SearchCodeList,',')))  

AND (@ProductCreateTimeFrom is null OR cn.CreateTime between @ProductCreateTimeFrom and @ProductCreateTimeTo) 

end


（2）、时间范围的处理方法，这样可以防止不同电脑上的时间设置格式的不同。


productSaleTimeFrom = this.dtpStartSellDateFrom.Value.Date.ToString("yyyy-MM-dd") + " 0:00:00";//2012-09-14 0:00:00

productSaleTimeTo = this.dtpStartSellDateTo.Value.Date.AddDays(1).AddMilliseconds(-100).ToString("yyyy-MM-dd") + " 23:59:59";//2012-09-14 23:59:59


（3）、sql中的事务写法

1、方法一

begin tran(开启事务)

begin try

//语句块

//……….

//……….

//……….

   commit tran(提交事务)

--return 1

end try

begin catch

   rollback tran（回滚事务）

--return 0

end catch

2、写法二

begin transaction

declare @error int

set @error = 0

insert into borrows(rid,bid,borrowdate) values

(5,10,2008-6-11)

set @error = @error + @@error

update books set bstate=1

where bid=10

set @error = @error + @@error

if @error <> 0

  rollback transaction

else

  commit transaction

源文档 <http://blog.sina.com.cn/s/blog_75a83e8b0100u7nx.html>

CREATE PROCEDURE UP_EbestPostOrderHeader_UpdateExportConfim
@EbestPostOrderHeaderId INT,
@User NVARCHAR(50)
AS

BEGIN

Begin try

Begin Tran

    UPDATE dbo.EbestPostOrderHeader SET IsExport = 1, ExportDate = GETDATE(), LastUpdTime= GETDATE(),LastUpdUser = @User

     WHERE EbestPostOrderHeaderId = @EbestPostOrderHeaderId

     UPDATE dbo.PromotionOrderHeader SET IsExport = 1, ExportTime = GETDATE(), LastUpdTime= GETDATE(),LastUpdUser = @User

     WHERE EbestPostOrderHeaderId = @EbestPostOrderHeaderId

     COMMIT TRAN

END TRY

BEGIN CATCH

   ROLLBACK TRAN

END CATCH

END