Question

我有存储过程：

 ALTER PROCEDURE [dbo].[proc_GetApplicationByCostCentreId]
(    
  @CostCentreId TINYINT,
  @DepartmentId INT = NULL,
  @IsActive BIT = NULL
)
AS 

BEGIN
    SELECT 
        A.Id, A.Name, A.URL, 
        A.CostCentreId, C.CostCentre,
        A.DepartmentId, D.DepartmentName,
        A.ApplicationOwnerTypeId, AOT.Type,
        A.SupportContact,
        A.IsActive, A.AddedOn, A.AddedBy, A.ModifiedOn, A.ModifiedBy
    FROM 
        dbo.Applications A
        INNER JOIN dbo.Central_CostCentre_Main C ON A.CostCentreId = C.CostCentreId
        LEFT OUTER JOIN dbo.Central_Department_Main D ON A.DepartmentId = D.DepartmentID 
        INNER JOIN dbo.ApplicationOwnerType AOT ON A.ApplicationOwnerTypeId = AOT.Id
    WHERE    
        A.CostCentreId = @CostCentreId
    AND CASE WHEN @DepartmentId IS NULL THEN 1 ELSE CASE WHEN A.DepartmentId = @DepartmentId THEN 1 ELSE 0 END END = 1
    AND CASE WHEN @IsActive IS NULL THEN 1 ELSE CASE WHEN A.IsActive = @IsActive THEN 1 ELSE 0 END END = 1
    ORDER BY [Name]
END

现在在这个程序中，如果我通过@ DepartmentId = 24然后我只得到部门24的结果，但是我希望它显示@ DepartmentId = 24和departmentsId = null的结果

我应该如何修改程序才能得到这个？

Answer 1

尝试将此作为where子句：

WHERE    
    A.CostCentreId = @CostCentreId AND 
    (A.DepartmentId = @DepartmentId OR A.DepartmentId IS NULL 
        OR @DepartmentId IS NULL) /* also return row if the arg is null */ AND
    A.IsActive = ISNULL(@IsActive, 1)
ORDER BY [Name]

编辑：您也可以尝试：

WHERE    
    A.CostCentreId = @CostCentreId AND 
    (ISNULL(A.DepartmentId, @DepartmentId) = @DepartmentId 
        OR @DepartmentId IS NULL) /* also return row if the arg is null */ AND
    A.IsActive = ISNULL(@IsActive, 1)
ORDER BY [Name]

Answer 2

WHERE COALESCE(A.DepartmentId, 'x') = COALESCE(@DepartmentId, A.DepartmentId, 'x')

假设'x'是类型DepartmentId的有效值，但在域中不存在。

但是，请考虑使用一系列IF块可以获得更好的性能。

如果存储过程中的情况

2 个答案: