Question

我正在搜索4个参数而没有必填字段参数是

市
婚姻状况
性别
组

根据选择，我得到像这样的SQL查询

select * from UserTable 
where Gender='Male' AND City='' AND MaritalStatus='Single' AND Groups =''

它返回0行，因为参数City=''和Groups =''与标准不匹配。

有没有办法实现这一点，而无需在多个组合中检查null。我使用MSSQL2012作为我的数据库和Asp.Net C#。

我的方法如下

private void GetSearchResults(string city, string MaritalStatus, string Gender, string Groups)
{
    var qry="select * from UserTable 
    where Gender='"+Gender+"' AND City='"+city+"' AND MaritalStatus='"+MaritalStatus+"' AND Groups ='"+Groups+"'";
}

我的选择组=＆＃39;＆＃39;意味着我不想在Group

Answer 1

select * from UserTable where Gender='Male' AND City IS NULL AND MaritalStatus='Single' AND Groups IS NULL

Answer 2

假设您有以下参数

@Gender = 'Male',
@City = '',
@MaritalStatus = 'Married'
@Groups = ''

你的sql看起来像。

select * from UserTable 
where 
(Gender = @Gender OR ISNULL (@Gender, '') = '')
AND (City = @City OR ISNULL (@City, '') = '')
AND (MaritalStatus = @MaritalStatus OR ISNULL (@MaritalStatus, '') = '')
AND (Groups = @Groups OR ISNULL (@Groups, '') = '')

使用动态值搜索多个参数

2 个答案: