sql字段为空,MSSQL 存储过程实现更新，如果要更新的字段内容为空，则该字段不作变更，只更新其他字段

一项目有这个需求，顺便将代码贴上，共同学习。
/****** 定义输入参数 ******/ ALTER proc [dbo].[upkeywords] @inkeyval nvarchar(100), @inkeycompete int, @inkeyinclude int, @inKeyID int as DECLARE /****** 定义变量 ******/ @keyval nvarchar(100), @keycompete int, @keyinclude int, @KeyID int /****** 给变量赋原来的值 ******/ set @keyval=(select KeyVal from Keywords where KeyID=@inKeyID) set @keycompete=(select keycompete from Keywords where KeyID=@inKeyID) set @keyinclude=(select keyinclude from Keywords where KeyID=@inKeyID) /****** 如果传入的参数是NULL，就将原来的值还给它 ******/ update Keywords set KeyVal=ISNULL(@inkeyval,@keyval), keycompete=ISNULL(@inkeycompete,@keycompete), keyinclude=ISNULL(@inkeyinclude,@keyinclude) where KeyID=@inKeyID

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