Documentation

Query SQL databases

Use sql.from() to query SQL databases with Flux.

Databases

sql.from() supports the following SQL databases:

Drivers

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

  • awsathena
  • 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")

sql.from(
  driverName: "postgres",
  dataSourceName: "postgresql://${username}:${password}@localhost:5432",
  query: "SELECT * FROM example_table"
)

Results structure

sql.from() returns a stream of tables with no grouping (all rows in a single table). For more information about table grouping, see Flux data model - Restructure tables.

Column data types

Each sql.from() driver converts column data types from the source database into Flux data types. See the database guides for information about data type conversions.

Given the following example_table in a MySQL database:

example_table
IDNameAddressCountry
1Alfreds FutterkisteObere Str. 57Germany
2Ana Trujillo Emparedados y heladosAvda. de la Constitución 2222Mexico
3Antonio Moreno TaqueríaMataderos 2312Mexico
4Around the Horn120 Hanover Sq.UK
5Berglunds snabbköpBerguvsvägen 8Sweden
Flux query
import "sql"

sql.from(
  driver: "mysql",
  dataSourceName: "username:passwOrd@tcp(localhost:3306)/db",
  query: "SELECT ID, Name FROM example_table"
)
Output
IDName
1Alfreds Futterkiste
2Ana Trujillo Emparedados y helados
3Antonio Moreno Taquería
4Around the Horn
5Berglunds snabbköp

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