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

本文转自cnn23711151CTO博客，原文链接：http://blog.51cto.com/cnn237111/495696 ，如需转载请自行联系原作者