SQLServer 存储过程中不拼接SQL字符串实现多条件查询

下面是 不采用拼接sql字符串实现多条件查询的解决方案

第一种写法是 感觉代码有些冗余
if (@adddate is not null) and (@name <> '')?
????? select * from table where adddate = @adddate and name = @name
else if (@adddate is not null) and (@name ='')?
????? select * from table where adddate = @adddate
else if(@adddate is? null) and (@name <> '')?
????? select * from table where and name = @name
else if(@adddate is? null) and (@name = '')
select * from table

第二种写法是

select * from table where (adddate = @adddate or @adddate is null) and (name = @name or @name = '')
第三种写法是

select * from table where adddate = case @adddate is null then adddate else @adddate end,name = case @name when '' then name else @name end

（编辑：李大同）

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