C# 使用多个选项搜索数据库

我使用SQL Server 2008 Express和高级服务。我有一个看法：

IF EXISTS (select * from sys.views where object_id = object_id(N'[dbo].[vw_PersonDetails]'))
    DROP VIEW vw_PersonDetails
GO

CREATE VIEW vw_PersonDetails
AS
    SELECT
        p.PersonID, p.Title, 
        p.FirstName, p.LastName,
        a.AddressLine1, a.AddressLine2, a.AddressLine3, a.AddressLine4,
        a.Country, a.PostalCode, 
        a.PhoneNumber, a.Email, p.EntryDate
    FROM  
        [dbo].[Persons] p
    INNER JOIN 
        [dbo].[Address] a ON p.PersonID = a.PersonID
GO

现在我必须用每个列作为选项来搜索这个视图

例：

现在除了在存储过程中编写永不结束的IF-ELSE-IF跟踪或动态构建查询之外，还有其他选项吗。请帮忙

另一个问题是什么会更好：编写这样的存储过程还是从代码中进行动态查询

---

提前感谢。

您需要填写所有搜索字符串才能运行查询（因为IF语句中的AND条件）

无论是否传递参数，都可以创建要运行的动态查询：

DECLARE @sqlCommand VARCHAR(MAX)
SELECT @sqlCommand = 'SELECT * FROM dbo.vw_PersonDetails WHERE 1=1'

IF  (@firstName != NULL OR @firstName != '') SELECT @sqlCommand = @sqlCommand + ' AND FirstName LIKE [dbo].[GetSearchString](@firstName)'
IF  (@lastName != NULL OR @lastName != '') SELECT @sqlCommand = @sqlCommand + ' AND LastName LIKE [dbo].[GetSearchString](@lastName)'
IF  (@addressLine1 != NULL OR @addressLine1 != '') SELECT @sqlCommand = @sqlCommand + ' AND AddressLine1 LIKE [dbo].[GetSearchString](@addressLine1)'

.....

EXEC (@sqlCommand)

---

您可以在一个简单的查询中完成此操作：

SELECT * from dbo.vw_PersonDetails WHERE (
    (@firstName IS NULL OR @firstName = '' OR FirstName like @firstName) AND
    ... (same thing for other parameters)

这将起作用，因为SQL Server足够智能，能够以预期的方式缩短计算过程。然而，规范并不能保证这一点

如果您希望安全起见，可以通过执行以下操作强制执行评估命令：

SELECT * from dbo.vw_personDetails WHERE (
    (CASE 
        WHEN @firstname IS NULL THEN 1
        WHEN @firstname='' THEN 1
        WHEN FirstName like @firstName THEN 1
        ELSE 0
     END=1) AND
    .... (same thing for other parameters)

SELECT * from dbo.vw_personDetails WHERE (
    (CASE 
        WHEN @firstname IS NULL THEN 1
        WHEN @firstname='' THEN 1
        WHEN FirstName like @firstName THEN 1
        ELSE 0
     END=1) AND
    .... (same thing for other parameters)