SQL Server查询构建

Question

我在SQL Server数据库中有一组数据，我需要计算机器的正常运行时间。我使用两个变量来确定正常运行时间或停机时间。这两个变量是machine_ON和failure(s)。 machine_ON只是数据库中的一个变量，failure可能有64个不同的失败，但都表示为fx_x。

这些变量的状态信息存储在数据库中，如下所示：

timestamp                   failurebitNr    timestampOutOfAlarm
2012-01-17 10:38:58.000     f1_14           2012-01-17 10:39:05.000

含义：失败f1_14在2012-01-17 10:38:58.000到2012-01-17 10:39:05.000

之前有效

同样，machine_ON状态以相同的方式保存在同一个表格中，只有failurebitNr具有不同的值[t2_13]。

因此，要确定正常运行时间，我需要在timestamp和timestampOutOfAlarm之间得到时间推移，其中failurebutNr = 't2_13'减去任何失败时间。

例如，我的数据库中有这些行：

这应该给出以下图形表示：

绿色是正常运行时间，红色是停机时间。

我习惯使用PHP而不是使用while循环并提交一些数组并执行其他脚本编写。但现在我需要以查询的方式在SQL Server数据库中完成所有这些...

那么，我如何计算正常运行时间（绿色）和停机时间（红色）？

更新

我试图在几秒钟内获得机器开启的时间。我使用了这个查询：

<!-- language: lang-sql -->
DECLARE @startDate datetime
DECLARE @endDate datetime
DECLARE @projectNr int
DECLARE @MachineNr nvarchar(10) 

SET @startDate = '2012-01-01 00:00:00.000'
SET @endDate  = '2012-02-01 00:00:00.000'
SET @projectNr = '1234567'
SET @MachineNr = '2'

SELECT 
    DATEDIFF("SECOND",
        CASE WHEN timestamp < @startDate 
            THEN @startDate 
            ELSE timestamp 
        END, 
        CASE WHEN timestampOutOfAlarm > @endDate OR timestampOutOfAlarm IS NULL 
            THEN @endDate
            ELSE timestampOutOfAlarm 
        END) AS Uptime
FROM 
    [table]
WHERE
     timestamp < @endDate
     AND (timestampOutOfAlarm > @startDate OR timestampOutOfAlarm IS NULL)
     AND fileProjectNr = @projectNr
     AND fileProjectMachineNr = @MachineNr
     AND (failureBitNr = 't2_13' AND failureBitValue = '1')

Answer 1

问题解决了：

我是在2个存储过程或Query中完成的。一个用于获得“ON”时间，一个用于在“ON”时间内获得所有“DOWN”时间。这两次我可以计算正常运行时间，停机时间和维护时间。

查询开启时间：

<!-- language: lang-sql -->
SELECT  fctAlarmId,
        fileProjectNr, 
        fileProjectMachineNr, 
        failureBitNr,   
        timestamp, 
        CASE WHEN timestampOutOfAlarm > @endDate OR timestampOutOfAlarm IS NULL 
            THEN @endDate
            ELSE timestampOutOfAlarm
        END 
        AS timestampOutOfAlarm
INTO    #tempTable1
FROM    fctAlarmHistory
WHERE   (timestampOutOfAlarm >= @startDate OR timestampOutOfAlarm = NULL) 
        AND timestamp < @endDate
        AND failureBitValue = 1 
        AND failureBitNr = 't2_13'
        AND fileProjectNr = @projectNr
        And fileProjectMachineNr = @ProjectMachineNr

-- SUM the result of all ON times into OnTime in seconds
SELECT 
    SUM(DATEDIFF("SECOND",
        CASE WHEN timestamp < @startDate 
            THEN @startDate 
            ELSE timestamp 
        END, 
        CASE WHEN timestampOutOfAlarm > @endDate
            THEN @endDate 
            ELSE timestampOutOfAlarm 
        END)) AS OnTime
FROM
    #tempTable1

查询开启时间内的停机时间：

<!-- language: lang-sql -->
SELECT  fctAlarmId,
        fileProjectNr, 
        fileProjectMachineNr, 
        failureBitNr,   
        timestamp, 
        CASE WHEN timestampOutOfAlarm > @endDate OR timestampOutOfAlarm IS NULL 
            THEN @endDate
            ELSE timestampOutOfAlarm
        END 
        AS timestampOutOfAlarm
INTO    #tempTable1
FROM    fctAlarmHistory
WHERE   (timestampOutOfAlarm >= @startDate OR timestampOutOfAlarm = NULL) 
        AND timestamp < @endDate
        AND failureBitValue = 1 
        AND failureBitNr = 't2_13'
        AND fileProjectNr = @projectNr
        And fileProjectMachineNr = @ProjectMachineNr

SELECT  fctAlarmId,
        fileProjectNr, 
        fileProjectMachineNr, 
        failureBitNr,   
        timestamp, 
        CASE WHEN timestampOutOfAlarm > @endDate OR timestampOutOfAlarm IS NULL 
            THEN @endDate
            ELSE timestampOutOfAlarm
        END 
        AS timestampOutOfAlarm
INTO    #tempTable2
FROM    fctAlarmHistory
WHERE   (timestamp BETWEEN @startDate AND @endDate) 
        AND failureBitValue = 1
        AND (failureBitNr LIKE'f%')
        AND fileProjectNr = @projectNr
        And fileProjectMachineNr = @ProjectMachineNr

CREATE TABLE #tempTable3
(
ID int IDENTITY(1,1),
timestamp datetime,
timestampOutOfAlarm datetime
)

DECLARE failure_Cursor CURSOR FOR
SELECT timestamp, timestampOutOfAlarm
FROM #tempTable2
ORDER BY timestamp ASC

OPEN failure_Cursor

-- Perform the first fetch.
FETCH NEXT FROM failure_Cursor
INTO @rij_timestamp, @rij_timestampOutOfAlarm

INSERT INTO #tempTable3 (timestamp, timestampOutOfAlarm) VALUES(@rij_timestamp,@rij_timestampOutOfAlarm)

-- Check @@FETCH_STATUS to see if there are any more rows to fetch.
WHILE @@FETCH_STATUS = 0
    BEGIN
        PRINT @rij_timestamp
        IF @rij_timestamp <= (SELECT TOP 1 timestampOutOfAlarm FROM #tempTable3 ORDER BY timestamp DESC)
        BEGIN   
            IF @rij_timestampOutOfAlarm > (SELECT TOP 1 timestampOutOfAlarm FROM #tempTable3 ORDER BY timestamp DESC)
            BEGIN
                UPDATE #tempTable3 SET timestampOutOfAlarm = @rij_timestampOutOfAlarm WHERE ID = (SELECT TOP 1 ID FROM #tempTable3 ORDER BY timestamp DESC)

            END
        END
        ELSE
            INSERT INTO #tempTable3 (timestamp, timestampOutOfAlarm) VALUES(@rij_timestamp,@rij_timestampOutOfAlarm)

        FETCH NEXT FROM failure_Cursor
        INTO @rij_timestamp, @rij_timestampOutOfAlarm
    END
CLOSE failure_Cursor
DEALLOCATE failure_Cursor

-- Select the failure time.
SELECT 
    SUM(DATEDIFF("SECOND",
        CASE WHEN tt3.timestamp < @startDate 
            THEN @startDate 
            ELSE tt3.timestamp 
        END, 
        CASE WHEN tt3.timestampOutOfAlarm > tt1.timestampOutOfAlarm 
            THEN tt1.timestampOutOfAlarm 
            ELSE tt3.timestampOutOfAlarm 
        END)) AS DownTime
FROM
    #tempTable3 tt3
INNER JOIN
    #tempTable1 tt1
ON
    tt3.timestamp BETWEEN tt1.timestamp AND tt1.timestampOutOfAlarm