SEARCH中的選項參數CFQL方法不是類型varchar

Question

是否有可能允許傳遞可選參數而不是varchar（即DateTime，decimal ..）的搜索函數？

我需要搜索日期範圍內的行。用戶應該能夠搜索從一個日期，或者直到一個日期，甚至在一個FROM-TO範圍內。

我的方法是用Date參數創建一個SEARCH方法。這些在CFE中正確轉換爲DateTime對象，但我無法傳遞空值。

我設法創建了一個帶有未選中部分的SEARCH方法，但是這些部分在函數體中不會獲得optionnal。

我怎樣才能從日期和日期參數設置爲可選？

CFQL體是產生

SEARCH(string amount, string fromDate, string toDate, string otherEntityId, date date) WHERE [$Entity::Date$ >= CAST(@fromDate AS DATE)] AND [$Entity::Date$ <= CAST(@toDate AS DATE)] AND OtherEntity.OtherEntityId = @otherEntityId AND Amount = @amount and date = @date 

身體過程如下。請注意，不是自選

CREATE PROCEDURE [Schema].[Entity_NameOfProcedure] 
(
@amount [nvarchar] (256) = NULL, 
@fromDate [nvarchar] (256) = NULL, 
@toDate [nvarchar] (256) = NULL, 
@OtherEntityId [nvarchar] (256) = NULL, 
@date [date] = NULL, 
@_orderBy0 [nvarchar] (64) = NULL, 
@_orderByDirection0 [bit] = 0 
) 
AS 
SET NOCOUNT ON 
DECLARE @sql nvarchar(max), @paramlist nvarchar(max) 

SELECT @sql= 
'SELECT DISTINCT * /*on purpose for stackoverflow */ 
    FROM [Schema].[Entity] 
     LEFT OUTER JOIN [Schema].[OtherEntity] ON ([Schema].[Entity].[Entity_OtherEntity_OtherEntityId] = [Schema].[OtherEntity].[OtherEntity_OtherEntityId]) 
    WHERE (([Entity].[Entity_Date] >= CAST(@fromDate AS DATE) AND ([Entity].[Entity_Date] <= CAST(@toDate AS DATE) AND ((1 = 1) AND ((1 = 1) AND (([Schema].[OtherEntity].[OtherEntity_NumberInt] LIKE ''6%'') AND (1 = 1)))))) AND (1 = 1))' 
SELECT @paramlist = '@amount nvarchar (256), 
    @fromDate nvarchar (256), 
    @toDate nvarchar (256), 
    @otherEntityId nvarchar (256), 
    @date date, 
    @_orderBy0 nvarchar (64), 
    @_orderByDirection0 bit' 
IF @amount IS NOT NULL 
    SELECT @sql = @sql + ' AND (([Schema].[Entity].[Entity_amount] = @amount))' 
IF @otherEntityId IS NOT NULL 
    SELECT @sql = @sql + ' AND (([Schema].[OtherEntity].[OtherEntity_OtherEntityId] = @OtherEntityId))' 
IF @date IS NOT NULL 
    SELECT @sql = @sql + ' AND (([Schema].[Entity].[Entity_Date] = @date))' 
EXEC sp_executesql @sql, @paramlist, 
    @amount, 
    @fromDate, 
    @toDate, 
    @OtherEntityId, 
    @date, 
    @_orderBy0, 
    @_orderByDirection0 

RETURN 
GO 

謝謝您的回答

Answer 1

未檢查的部分採用可選日期參數創建SEARCH方法：

SEARCH(date fromDate, date toDate) 
WHERE CreationDate >= @fromDate AND CreationDate <= @toDate 

這生成的SQL語句：

SELECT @sql= 
'SELECT DISTINCT [Employee_Id], [Employee_FirstName], [Employee_CreationDate] 
    FROM [Employee] 
    WHERE (1 = 1)' 
SELECT @paramlist = '@fromDate datetime, @toDate datetime' 
IF @fromDate IS NOT NULL 
    SELECT @sql = @sql + ' AND (([Employee_CreationDate] >= @fromDate))' 
IF @toDate IS NOT NULL 
    SELECT @sql = @sql + ' AND (([Employee_CreationDate] <= @toDate))' 

的fromDate和toDate參數不在所生成的BOM可爲空的。不過，如果你使用默認值默認爲等於CodeFluentPersistence.DefaultDateTimeValue（More about default values），NULL將被髮送到存儲過程。

如果你喜歡DateTime?只是改變從date參數的類型date?

SEARCH(date? fromDate, date? toDate) 
WHERE CreationDate >= @fromDate AND CreationDate <= @toDate 

能產生下面的C＃方法：

public static EmployeeCollection Search(DateTime? fromDate, DateTime? toDate)