SQL动态更新表字段 传入字段可能为空

小技巧: 项目组有修改产品的基本信息字段 但有时候传入的字段可能为空 也可能不为空  动态修改表中字段.

 USE [BetaProductMarket_DB]
 GO
 IF(EXISTS(SELECT * FROM dbo.sysobjects WHERE id=object_id(N'[dbo].[USP_SaveProductBaseInfo]') AND OBJECTPROPERTY(id,   N'IsProcedure')= 1))
 BEGIN
     DROP PROCEDURE [dbo].USP_SaveProductBaseInfo
 END
 GO

 /*
 作    者：Roni
 功    能：修改产品基本信息
 创建时间：2016-5-24

 摘    要：

 */

 CREATE PROCEDURE [dbo].USP_SaveProductBaseInfo

     @ProductID INT,
     @ProductType TINYINT=0,
     @ProductName VARCHAR(200)=null ,
     @RecommendIndex TINYINT=0     ,
     @Issuer VARCHAR(200)=null,
     @Period TINYINT=0    ,
     @Movement VARCHAR(300)=null ,
     @InvestmentDirection TINYINT=7,
     @YieldsFixed   DECIMAL(18, 4)=0    ,
     @YieldsFloat   DECIMAL(18, 4)=0     ,
     @YieldsType     TINYINT=0    ,
     @Amount    DECIMAL(18, 4)=0     

 AS

 BEGIN

 UPDATE Tb_Product
 SET  UpdateTime=GETDATE(),
         ProductName= CASE WHEN @ProductName IS NULL THEN Tb_Product.ProductName ELSE @ProductName END ,
         ProductType= CASE WHEN @ProductType=0 THEN Tb_Product.ProductType ELSE @ProductType END   ,
         RecommendIndex = CASE WHEN @RecommendIndex =0 THEN Tb_Product.RecommendIndex ELSE @ProductType END     ,
         Issuer= CASE WHEN @Issuer IS NULL THEN Tb_Product.Issuer ELSE @Issuer END ,
         Period= CASE WHEN @Period=0 THEN Tb_Product.Period ELSE @Period END   ,
         Movement= CASE WHEN @Movement IS NULL THEN Tb_Product.Movement ELSE @Movement END ,
         InvestmentDirection= CASE WHEN @InvestmentDirection=7 THEN Tb_Product.InvestmentDirection ELSE @InvestmentDirection END   ,
         YieldsFixed= CASE WHEN @YieldsFixed=0 THEN Tb_Product.YieldsFixed ELSE @YieldsFixed END   ,
         YieldsFloat= CASE WHEN @YieldsFloat=0 THEN Tb_Product.YieldsFloat ELSE @YieldsFloat END   ,
         YieldsType= CASE WHEN @YieldsType=0 THEN Tb_Product.YieldsType ELSE @YieldsType END   ,
         Amount= CASE WHEN @Amount=0 THEN Tb_Product.Amount ELSE @Amount END
 WHERE ProductID = @ProductID

 END