Question

编辑：

我试图替换：

@LocationIDs NVARCHAR(MAX) = null,

与

@LocationIDs LocationIdArray READONLY,

但现在我收到一条错误说：

必须声明标量变量＆＃34; @ LocationIDs＆＃34;。

- 结束编辑 -

我有这个存储过程需要解决：

CREATE PROCEDURE [dbo].[spAP_GetTechnician_Door_Unlock]   
    @LocationIDs NVARCHAR(MAX) = NULL,  
    @AlarmDateFrom DATETIME = NULL,  
    @AlarmDateTo DATETIME = NULL,  
    @TechnicianID INT = NULL,
    @LocationId INT = NULL
AS
BEGIN
    IF (@LocationIDs = 'x')  
    BEGIN
        SELECT @LocationIDs = dbo.fn_GetAll_Location_Id()  
    END

    DECLARE @query NVARCHAR(MAX);

    SET @query = 'WITH CTE AS (SELECT ROW_NUMBER() OVER(ORDER BY al.Alarm_Log_ID desc)AS RowNumber,  
 isnull(t.Technician_ID,'''')[Technician_ID], (isnull(t.Last_Name,'''') +'' ''+  isnull(t.Name,''''))  TechnicianName,isnull(t.Emailid,'''') as EmailID,isnull(t.phone,'''') as Phone,dbo.fNAP_DateFormat(al.Alarm_date) as Alarm_date,                  
 Al.Site_ID,s.Name as SiteName,al.point_Address,l.location_Name,l.Location_ID ,shs.StatusData                  
from z_EntityMast_Alarm_Log al                   
left join  z_EntityMast_Technician t on al.Technician_ID=t.Technician_id                  
left join z_EntityMast_Site s on s.Site_ID=al.Site_ID                  
left join z_EntityMast_Location l on s.Location_ID=l.Location_id                  
left join z_EntityMast_Site_Hardware_Status shs on s.site_id=shs.siteid                   
left join z_SysVar_Alarm_Type_00004 at on al.Alarm_Type=at.ID                   
where at.Is_Linkable=1 and al.Alarm_Type !=70'               
if(isnull(@LocationId,0)!=0)            
set @query=@query+' and s.Location_ID ='+convert(varchar(12),@LocationId);            
else            
set @query=@query+' and s.Location_ID in ('+@LocationIDs+')';   
if(isnull(@AlarmDateFrom,0)!=0 and @AlarmDateFrom !='')  
set @query=@query+'and (DATEDIFF(DAY,'''+convert(varchar(30),@AlarmDateFrom)+''', al.Alarm_Date)>=0 and  DATEDIFF(DAY,'''+convert(varchar(30),@AlarmDateTo)+''',al.Alarm_Date)<=0)';                
if(isnull(@TechnicianID,0)!=0)  
set @query=@query+'and t.Technician_ID ='+ convert(varchar(10),@TechnicianID);  
set @query=@query + ')';  
set @query=@query +'select * from CTE ';  

    -- PRINT @query  
    EXEC (@query)  
END

我需要对其进行优化，我必须对LocationIds参数使用表值参数，而不是使用NVARCHAR(MAX)。

问题在于这行代码：

SET @query  = @query + ' and s.Location_ID in ('+@LocationIDs+')';

我的问题是：如何替换该行代码并将其替换为表值参数，以便连接仍然有效？

谢谢！

Answer 1

SET @query = @query + ' and s.Location_ID in ('+@LocationIDs+')';
我的问题是：如何替换该行代码并替换它用一个表值参数以这种方式连接还能用吗？

假设您的LocationIdArray有此定义：

create type LocationIdArray as table (LocationId int);

然后你的IN应该是这样的：

and s.Location_ID in (select LocationId from @LocationIDs)

这不会在exec内工作，因为@LocationID位于exec的外部范围内，您可以将其作为参数传递给sp_executesql但是您可以做的最好的事情是将动态查询重写为静态查询，因为这里没有理由使用动态代码。

如何将表值参数与IN关键字一起使用

1 个答案: