@konsumation/db-level

konsum-db

timeseries database on leveldb

example

import levelup from "levelup";
import leveldown from "leveldown";

import { Master, Category } from "konsum-db";

async function example() {
 // open database
 const db = await levelup(leveldown("example.db"));
 const master = await Master.initialize(db);

 // create category named EV
 const ev = new Category("EV", master, { unit: "kWh" });
 await ev.write(master.db);
 
 // write entry
 await ev.writeValue(db, Date.now(), 77.34);
}

example();

API

Table of Contents

• LevelCategory
  • Parameters
  • Properties
  • write
    • Parameters
  • key
  • meters
    • Parameters
  • entries
    • Parameters
• MASTER
• CATEGORY_PREFIX
• VALUE_PREFIX
• METER_PREFIX
• NOTE_PREFIX
• LevelMaster
  • Properties
  • write
    • Parameters
  • close
  • categories
    • Parameters
  • initialize
    • Parameters
• LevelMeter
  • Parameters
  • Properties
  • notes
    • Parameters
  • values
    • Parameters
  • key
• LevelNote
  • key
• secondsAsString
  • Parameters
• LevelValue
  • key

LevelCategory

Extends Category

Value Category.

Parameters

• name string category name

• options Object

  • options.description string
  • options.unit string physical unit like kWh or m3
  • options.fractionalDigits number display precission

Properties

• name string category name
• description string
• unit string physical unit
• fractionalDigits number display precission

write

• See: {key}

Writes object into database. Leaves all other entries alone.

Parameters

• db ClassicLevel

key

Returns string

meters

Get Meters of the category.

Parameters

• db ClassicLevel

• options Object?

  • options.gte string? from name
  • options.lte string? up to name
  • options.reverse boolean? order

Returns AsyncIterable<Meter>

entries

Get categories.

Parameters

• db ClassicLevel
• gte (string | undefined) lowest name (optional, default "\u0000")
• lte (string | undefined) highst name (optional, default "\uFFFF")

Returns AsyncIterable<Category>

MASTER

Prefix of the master record

Type: string

CATEGORY_PREFIX

Prefix of the categories. Will be followed by the category name

Type: string

VALUE_PREFIX

Prefix of the values. Will be followed by the category name

Type: string

METER_PREFIX

Prefix of the meters. Will be followed by the category name

Type: string

NOTE_PREFIX

Prefix of the notes. Will be followed by the category name

Type: string

LevelMaster

Extends Master

Master record. Holds schema version.

Properties

• schemaVersion string

write

• See: {key}

Writes object into database. Leaves all other entries alone.

Parameters

• db ClassicLevel

close

Close the underlaying database.

categories

List Categories.

Parameters

• context
• gte string?
• lte string?

initialize

Initialize database. checks/writes master record.

Parameters

• directory string

Returns Promise<Master>

LevelMeter

Extends Meter

Meter

Parameters

• name string meter name

• category Category

• options Object

  • options.description string
  • options.unit string physical unit like kWh or m3
  • options.fractionalDigits number display precission

Properties

• name string category name
• description string
• unit string physical unit
• fractionalDigits number display precission

notes

List assigned Notes.

Parameters

• db any
• options Object?

Returns AsyncIterable<LevelNote>

values

Get values of the meter.

Parameters

• db any

• options Object?

  • options.gte string? time of earliest value
  • options.lte string? time of latest value
  • options.reverse boolean? order

Returns AsyncIterable<Value>

key

Returns string

LevelNote

Extends Note

Hints placed on a category at a specific time.

key

Returns string

secondsAsString

Format seconds as string left padded with '0'.

Parameters

• seconds number seconds since epoch

Returns string padded seconds

LevelValue

Extends Value

Hints placed on a category at a specific time.

key

Returns string