influxalchemy 0.2.5

Interact with InfluxDB using SQLAlchemy-style syntax

InfluxAlchemy

Query InfluxDB using SQLAlchemy-style syntax

Installation

pip install influxalchemy

Usage

import influxdb
import influxalchemy

Define InfluxAlchemy Measurements

class Widgets(influxalchemy.Measurement):
    __measurement__ = 'widgets'


class Wombats(influxalchemy.Measurement):
    __measurement__ = 'wombats'

The class-attribute __measurement__ can be omitted and will default to the class name if absent.

Open InfluxAlchemy Connection

db = influxdb.DataFrameClient(database="example")
flux = influxalchemy.InfluxAlchemy(db)

Query InfluxDB

Query Single Measurement

# SELECT * FROM widgets;
flux.query(Widgets)

Query Ad Hoc Measurement

# SELECT * from /.*/;
flux.query(influxalchemy.Measurement.new("/.*/"))

Select Fields of Measurement

# SELECT tag1, field2 FROM widgets;
flux.query(Widgets.tag1, Widgets.field2)

Query Across Measurements

# SELECT * FROM /widgets|wombats/;
flux.query(Widgets | Wombats)

Filter Tags

# SELECT * FROM widgets WHERE tag1 = 'fizz';
flux.query(Widgets).filter(Widgets.tag1 == "fizz")

Filter Tags with 'like'

# SELECT * FROM widgets WHERE tag1 =~ /z$/;
flux.query(Widgets).filter(Widgets.tag1.like("/z$/"))

Chain Filters

clause1 = Widgets.tag1 == "fizz"
clause2 = Widgets.tag2 == "buzz"

# SELECT * FROM widgets WHERE tag1 = 'fizz' AND tag2 = 'buzz';
flux.query(Widgets).filter(clause1 & clause2)

# SELECT * FROM widgets WHERE tag1 = 'fizz' OR tag2 = 'buzz';
flux.query(Widgets).filter(clause1 | clause2)

Group By

# SELECT * FROM widgets GROUP BY time(1d);
flux.query(Widgets).group_by("time(1d)")

# SELECT * FROM widgets GROUP BY tag1;
flux.query(Widgets).group_by(Widgets.tag1)

Time

# SELECT * FROM widgets WHERE (time > now() - 7d);
flux.query(Widgets).filter(Widgets.time > "now() - 7d")

# SELECT * FROM widgets WHERE time >= '2016-01-01' AND time <= now() - 7d;
d = date(2016, 1, 1)
flux.query(Widgets).filter(Widgets.time.between(d, "now() - 7d"))

Note that naive datetime object will be assumed in UTC timezone.