Question

我必须在sql 2008中编写一个搜索查询，它可以使用多个可选的
parameters..ie。

Date From: ... 
Date To:   ...
UserType:  ...
Customer:  ...
User:      ...

A user can select any of the above search parameters.
I am planning to use either the separate select statements for different cases, or 
to use coalesce etc.
Please suggest what would be best possible way out.

谢谢，

Answer 1

使用此方法可以避免使用多个IF ELSE条件和动态查询。

SELECT * FROM TBL
WHERE (@Name IS NULL OR Name = @Name) 
AND (@Age IS NULL OR Age = @Age)

Answer 2

你可以写你在哪里这样的事情......

SELECT ......
FROM TABLE
WHERE 
     (@UserType IS NULL OR UserType = @UserType)
AND
    (@Customer IS NULL OR Customer = @Customer)
AND
    (@User IS NULL OR User = @User)
AND
    (<Similarly Other Conditions>)

Answer 3

您可以使用动态查询

SELECT @sql=
'SELECT DISTINCT [Test_Id], [Test].[Test_Name], [Test].[Test_Date]
    FROM [Test]
    WHERE (1 = 1)'

IF @start IS NOT NULL
    SELECT @sql = @sql + ' AND ([Test].[Test_Date] >= @start)'
IF @end IS NOT NULL
    SELECT @sql = @sql + ' AND ([Test].[Test_Date] <= @end)'

SELECT @paramlist = '@start datetime, 
    @end datetime'

EXEC sp_executesql @sql, @paramlist,
    @start, 
    @end

你也可以使用不同的查询，但如果你有超过2个参数，那就是非常讨厌的代码

IF(@start IS NULL)
    IF(@end IS NULL)
        SELECT ...
    ELSE
        SELECT ...
ELSE
    IF(@end IS NULL)
        SELECT ...
    ELSE
         SELECT ...

具有多个可选搜索参数的SQL搜索查询

3 个答案: