凡在存儲過程

條件句從句我在存儲過程中下面的查詢（SQL服務器）：凡在存儲過程

SELECT 
    ea.attendanceid, 
    ea.employeeid, 

    FROM employee_attendance ea 

    WHERE 
    ea.masterentity = @masterentity 
    AND ea.employeeid = @employeeid 

    -- here I need to know what value @type is and then create my conditionals 
    AND (ISNULL(@type,'') = '' OR 
     .......

我的參數@type已經diferent字符串值：

IL =內部午餐
EL =外部午餐
L =所有午餐
N =僅正常
R =貝斯

，並根據該值，我要過濾的列：

If `@type='IL'` then I have to filter: `AND ea.lunchtype = 'C'` 
If `@type='EL'` then I have to filter: `AND ea.lunchtype = 'CI'` 
If `@type='L'` then I have to filter: `AND ea.islunch = 1` 
If `@type='N'` then I have to filter: `AND ea.islunch = 0` 
If `@type='R'` then I have to filter: `AND (ea.ismanual = 1 AND ea.lunchtype = 'K')`

上的任何線索如何做到這一點？

來源

2014-09-28 VAAA

您需要轉化爲SQL中類似的方式

AND ( 
ISNULL(@type, ' ') = ' ' 
OR (@type='IL' AND ea.lunchtype = 'C') 
OR (@type='EL' AND ea.lunchtype = 'CI') 
OR (@type='L' AND ea.islunch = 1 ) 
OR (@type='N' AND ea.islunch = 0 ) 
OR (@type='R' AND (ea.ismanual = 1 AND ea.lunchtype = 'K') 
) 
)

來源

2014-09-29 00:07:24 radar

使用CASE語句。

CASE可用於任何陳述或子句允許有效的表達式。例如，您可以在SELECT，UPDATE，DELETE和SET等語句中使用CASE，也可以在select_list，IN，，，ORDER BY和HAVING等子句中使用CASE。

MSDN CASE (Transact-SQL)

參考實例此頁面上的HOWTO。

來源

2014-09-29 00:13:57

凡在存儲過程

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