Interface IVariableHistorian

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Hierarchy

IVariableHistorian

Implemented by

VariableHistorian

Index

Methods

Methods

extractDataValues

extractDataValues(historyReadRawModifiedDetails: ReadRawModifiedDetails, maxNumberToExtract: number, isReversed: boolean, reverseDataValue: boolean, callback: (err: Error, dataValue?: DataValue[]) => void): void

- Defined in node-opcua-address-space-base/dist/ua_variable.d.ts:31
Extract a series of dataValue from the History database for this value

Parameters
- historyReadRawModifiedDetails: ReadRawModifiedDetails
- maxNumberToExtract: number
- isReversed: boolean
- reverseDataValue: boolean
- callback: (err: Error, dataValue?: DataValue[]) => void
  - - (err: Error, dataValue?: DataValue[]): void
    - Parameters
      - err: Error
      - Optional dataValue: DataValue[]
      Returns void
Returns void

push

push(newDataValue: DataValue): Promise<void>

- Defined in node-opcua-address-space-base/dist/ua_variable.d.ts:22
push a new value into the history for this variable the method should take a very small amount of time and not directly write to the underlying database

Parameters
- newDataValue: DataValue
Returns Promise<void>

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