Question

MSSQL2016

我需要从游标中过滤掉那些不返回结果的选项，以便不发送空的电子邮件。由于内部选择结果是html格式和强制转换，检查

IF @@ ROWCOUNT＆gt; 0

总是如此。更好的说，它始终是

@@ ROWCOUNT = 1

选择实际返回的行。

是否可以将实际的选择行数（在转换之前）作为临时参数传递给后续的EXEC sp_send_mail是/否检查？

OPEN C1;
    FETCH NEXT FROM C1 INTO
    @WishListID, @userEmail, @category, @range, @geoid, @searchCity, @userName, @GeoLocation
    WHILE @@FETCH_STATUS = 0
    BEGIN
            SET @tableHTML =  
            N'<H4>Hello ' +  @userName + '<H4>Here''s your Daily Digest</H4>' +  
            N'<table border="0">' +  
            N'<tr><th>Department</th>' +  
            N'<th>Name</th><th>Description</th>' +  
            N'<th>Place</th></tr>' +  
            CAST ( ( SELECT td = c.Name, '',  
                    td = p.Name, '',  
                    td = p.Description, '',
                    td = @searchCity
              FROM Products as p 
                    JOIN Categories AS c ON p.CategoryID = c.ID
                    JOIN AspNetUsers AS u ON p.UserID = u.Id
                    JOIN GeoData_ALL AS g ON u.GeoID = g.ID
                    WHERE p.IsApproved = 1 AND p.IsDeleted = 0 AND p.DateExpire > convert(date, getdate()) 
                    AND (@geoid = 0 or g.GeoLocation.STDistance(@GeoLocation) <= (@range*5000))
                    AND (@category = 0 or p.CategoryID = @category)
                    ORDER BY p.ID
                     FOR XML PATH('tr'), TYPE   
                ) AS NVARCHAR(MAX) ) +  
                N'</table>' ;       

                IF @@ROWCOUNT > 0 

                EXEC sp_send_mail
                @from='news@xyz.com',
                @to = @userEmail,  
                @subject = 'Weekly xyz Digest',  
                @body = @tableHTML,  
                @bodytype = 'htmlbody',
                @output_mesg = @out_mesg output, 
                @output_desc = @out_desc output ;  

    FETCH NEXT FROM C1 INTO
    @WishListID, @userEmail, @category, @range, @geoid, @searchCity, @userName, @GeoLocation

    END
    CLOSE C1;
DEALLOCATE C1;

Answer 1

当然可以，在游标循环中执行任何其他操作之前，您可以简单地使用SELECT COUNT（*）查询。

然而，执行您尝试执行的操作的一种更简洁的方法是检查@searchCity的值是否存在@tableHTML，而不是检查{{1 }}

要回答我认为你想要问的问题，那就是“如果我有一个@@ROWCOUNT>0语句，我可以在后面找到SELECT中有多少行吗？”

答案是否正确。好吧，不是没有解析和分析你添加SELECT结果的变量的值。您可以随时计算您填充的字符串中SET @var='some text' + SELECT SomeStuff的数量。

Answer 2

你可以做到

select 1

填充@rowcount

在SELECT转换

2 个答案: