問題描述
表(日志分析器)結構是:
The Table(Log Analyzer) structure is :
我想繪制一個折線圖，顯示過去 15 分鐘到當前時間(每分鐘)的會話數.我想編寫一個查詢，顯示包含以下信息的兩列:
I want to draw a line graph displaying the number of Sessions for last 15 minute to the current time (every minute). I want to write a query which displays two columns with the following information:
- 日期:小時:分鐘
- 會話數
我嘗試編寫一個顯示每小時請求的示例查詢:
I have tried to write a sample query displaying requests per hour:
select convert(nvarchar(16), L.TimeLog, 120) requestTime ,(select Count(SessionID) from LogData where TimeLog < convert(nvarchar(16), TimeLog, 120) and TimeLog > DATEADD (mi , -15 , convert(nvarchar(16), TimeLog, 120) ) ) AS Sessions
from LogData L
group by convert(nvarchar(16), TimeLog, 120) order by requestTime;
我嘗試創建一個類似于上面的查詢，但它顯示錯誤的結果.它應該每 15 分鐘顯示一些會話.并且 group by 子句將保持不變(即每分鐘)例如:在 10:00:00 它應該代表過去 15 分鐘到 10:00:00 的會話數(sessionID)，即:9:45:00 到 10:00:00 等
I tried to create a query similar to above but it shows wrong results . It should display a number of sessions every 15 minutes . and the group by clause will remain the same (ie. every minute) For example : at 10:00:00 it should represent the number of sessions (sessionID) in last 15 minutes to 10:00:00 ie: 9:45:00 to 10:00:00 and so on
推薦答案
這個有點復雜.首先，您需要創建一個 TimeSlot 表，將一天分成 15 分鐘的塊.
This one gets a little complicated. First you need to create a TimeSlot table that breaks a day into 15 minute chunks.
CREATE TABLE [TimeSlot](
[ID] [int] IDENTITY(1,1) NOT NULL,
[BeginTime] [datetime] NULL,
[EndTime] [datetime] NULL
) ON [PRIMARY]
填表:
DECLARE @Start DATETIME
SET @Start='00:00:00'
WHILE (@Start <'23:59:00')
BEGIN
INSERT INTO TimeSlot(BeginTime, EndTime) values (@Start,dateadd(mi,15,@Start))
SET @Start=dateadd(mi,15,@Start)
END
然后，對于丑陋的 SQL:
Then, for the ugly SQL:
SELECT convert(nvarchar(8), L.TimeLog,112) + ' ' + convert(nvarchar(8), S.BeginTime, 108) AS SlotBeginTime ,Count(LogID) AS Sessions
FROM LogData L, TimeSlot S
WHERE (convert(nvarchar(8), L.TimeLog,112) + convert(nvarchar(8), L.TimeLog, 108)) >= (convert(nvarchar(8), L.TimeLog,112)+ convert(nvarchar(8), S.BeginTime,108))
AND (convert(nvarchar(8), L.TimeLog,112) + convert(nvarchar(8), L.TimeLog, 108)) < (convert(nvarchar(8), L.TimeLog,112)+ convert(nvarchar(8), S.EndTime,108))
GROUP BY convert(nvarchar(8), L.TimeLog,112) + ' ' + convert(nvarchar(8), S.BeginTime, 108)
ORDER BY SlotBeginTime;
試試看.我沒有檢查它在多個日期的工作情況，但它確實適用于單個日期.
Try it out. I didn't check how well it works across multiple dates but it does would for a single date.
這篇關于編寫查詢以顯示日志文件中最近 15 分鐘的會話記錄的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！