Documentation

Write to SQL databases

Use sql.to() to write data to SQL databases with Flux.

Databases

sql.to() supports the following SQL databases:

Drivers

sql.to() uses Go SQL drivers in the Go sql package to connect to SQL databases. The following drivers are available:

  • bigquery
  • hdb
  • mysql
  • postgres
  • snowflake
  • sqlite3
  • sqlserver

Data source names

Each SQL driver supports unique data source name (DSN) syntaxes (also known as connection strings). See the database guides for information about DSNs for each driver.

Store sensitive credentials as secrets

If using InfluxDB Cloud or InfluxDB OSS 2.x, we recommend storing DSN credentials as InfluxDB secrets. Use secrets.get() to retrieve a secret from the InfluxDB secrets API.

import "sql"
import "influxdata/influxdb/secrets"

username = secrets.get(key: "POSTGRES_USER")
password = secrets.get(key: "POSTGRES_PASS")

sql.to(
    driverName: "postgres",
    dataSourceName: "postgresql://${username}:${password}@localhost:5432",
    table: "example_table",
)

Data Structure

sql.to() ungroups all rows into a single table and writes all existing columns as the specified destination table. If the destination table doesn’t exist, sql.to() attempts to create it.

Column data types

Each sql.to() driver converts Flux basic data types to corresponding data types supported by the target database. See the database guides for information about data type conversions.

Example

Given the following following stream of tables:

data
_time tag _value
2021-01-01T00:00:00Z t1 -2
2021-01-01T00:00:10Z t1 10
2021-01-01T00:00:20Z t1 7
_time tag _value
2021-01-01T00:00:00Z t2 19
2021-01-01T00:00:10Z t2 4
2021-01-01T00:00:20Z t2 -3
Flux script
import "sql"

data
    |> sql.to(
        driverName: "mysql",
        dataSourceName: "username:passwOrd@tcp(localhost:3306)/db",
        table: "exampleTable"
    )
SQL output
_time tag _value
2021-01-01 00:00:00 t1 -2
2021-01-01 00:00:10 t1 10
2021-01-01 00:00:20 t1 7
2021-01-01 00:00:00 t2 19
2021-01-01 00:00:10 t2 4
2021-01-01 00:00:20 t2 -3

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The future of Flux

Flux is going into maintenance mode. You can continue using it as you currently are without any changes to your code.

Flux is going into maintenance mode and will not be supported in InfluxDB 3.0. This was a decision based on the broad demand for SQL and the continued growth and adoption of InfluxQL. We are continuing to support Flux for users in 1.x and 2.x so you can continue using it with no changes to your code. If you are interested in transitioning to InfluxDB 3.0 and want to future-proof your code, we suggest using InfluxQL.

For information about the future of Flux, see the following: