ScadaClient.GetSlice

[Zeus]

Hi,
I use ScadaClient to get slice data from influxdb

ScadaClient.GetSlice(ArchiveBit.Minute, DateTime.UtcNow.AddMinute(-1), new int[] { 101 })

and it returns scadadata undefined stat 0 val 0

[Mikhail]

Hi,

Every execution of the above code a client requests different data points. Probably, they don’t exists. Try specifying particular timestamp.

[Zeus]

Hi,
I save data into influxdb per secend.
How can i get cnl data an hour ago.

[Mikhail]

Hi,
Could you clarify the question?

[Zeus]

Hi,
I use influxdb storage history data.
I can use api GetTrend and GetCurrentData get data from influx.
When i use getslice

ScadaClient.GetSlice(ArchiveBit.Minute, DateTime.UtcNow.AddMinute(-1), new int[] { 101 })

it returns scadadata undefined stat 0 val 0

the influxdb has cnl 101’s data every secend.

If i want to get cnl 101’s data at “DateTime.UtcNow.AddMinute(-1)”. how can i make it?

[Mikhail]

Hi,
To get a slice, you need to specify the exact timestamp. There is a very low chance that data exists exactly at DateTime.UtcNow.AddMinute(-1).

To be able to get slices, you should write data with a period. And specify the exact timestamps that fits the writing period.

[Mikhail]

May be we should add a method to get values closest to the specified timestamp.

[Zeus]

OK I will try

[Author]

Posts