最近在工作中要使用存储过程,因为前端页面传过来的下拉菜单的值不固定,数据是这样的,0是全部,1是男,2是女,当选择全部时,要能查询出所有的用户,否则只能查询出来男的用户或者女的用户,一般都是在存储过程中写
declare @sql nvarchar(500),@str nvarchar(20)
set?@str = 'and sex = 1'
set @sql = 'select * from 表 where id >0 '+ @str
exec sp_executesql?@sql ?或者 exec(@sql)
后来看了一篇博客发现还有另一种写法
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
引用博客地址:http://uule.iteye.com/blog/1988137
(编辑:李大同)
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