Write to SQL databases

Use to write data to SQL databases with Flux.

Databases supports the following SQL databases:

Drivers 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, mssql

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

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

Column data types

Each 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.


Given the following following stream of tables:

_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 query
import "sql"

  |> sql.from(
    driver: "mysql",
    dataSourceName: "username:passwOrd@tcp(localhost:3306)/db",
    table: "exampleTable"
SQL Query
SELECT * FROM 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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