SQL动态更新表字段 传入字段可能为空

 1 USE [BetaProductMarket_DB]
 2 GO
 3 IF(EXISTS(SELECT * FROM dbo.sysobjects WHERE id=object_id(N‘[dbo].[USP_SaveProductBaseInfo]‘) AND OBJECTPROPERTY(id,   N‘IsProcedure‘)= 1))
 4 BEGIN
 5     DROP PROCEDURE [dbo].USP_SaveProductBaseInfo
 6 END
 7 GO
 8 
 9 /*
10 作    者：Roni
11 功    能：修改产品基本信息
12 创建时间：2016-5-24
13 
14 摘    要：
15     
16 */
17 
18 CREATE PROCEDURE [dbo].USP_SaveProductBaseInfo
19 
20     @ProductID INT,
21     @ProductType TINYINT=0,
22     @ProductName VARCHAR(200)=null ,
23     @RecommendIndex TINYINT=0     ,
24     @Issuer VARCHAR(200)=null,
25     @Period TINYINT=0    ,
26     @Movement VARCHAR(300)=null ,
27     @InvestmentDirection TINYINT=7,
28     @YieldsFixed   DECIMAL(18, 4)=0    ,
29     @YieldsFloat   DECIMAL(18, 4)=0     ,
30     @YieldsType     TINYINT=0    ,
31     @Amount    DECIMAL(18, 4)=0     
32  
33 AS
34 
35 BEGIN
36 
37     
38 UPDATE Tb_Product   
39 SET  UpdateTime=GETDATE(),
40         ProductName= CASE WHEN @ProductName IS NULL THEN Tb_Product.ProductName ELSE @ProductName END ,
41         ProductType= CASE WHEN @ProductType=0 THEN Tb_Product.ProductType ELSE @ProductType END   ,
42         RecommendIndex = CASE WHEN @RecommendIndex =0 THEN Tb_Product.RecommendIndex ELSE @ProductType END     ,
43         Issuer= CASE WHEN @Issuer IS NULL THEN Tb_Product.Issuer ELSE @Issuer END ,
44         Period= CASE WHEN @Period=0 THEN Tb_Product.Period ELSE @Period END   ,
45         Movement= CASE WHEN @Movement IS NULL THEN Tb_Product.Movement ELSE @Movement END ,
46         InvestmentDirection= CASE WHEN @InvestmentDirection=7 THEN Tb_Product.InvestmentDirection ELSE @InvestmentDirection END   ,
47         YieldsFixed= CASE WHEN @YieldsFixed=0 THEN Tb_Product.YieldsFixed ELSE @YieldsFixed END   ,
48         YieldsFloat= CASE WHEN @YieldsFloat=0 THEN Tb_Product.YieldsFloat ELSE @YieldsFloat END   ,
49         YieldsType= CASE WHEN @YieldsType=0 THEN Tb_Product.YieldsType ELSE @YieldsType END   ,
50         Amount= CASE WHEN @Amount=0 THEN Tb_Product.Amount ELSE @Amount END   
51 WHERE ProductID = @ProductID
52 
53 
54 
55 
56       
57 
58 END