Query PostgreSQL - Influxdb

To query PostgreSQL with Flux:

Import the sql package.
Use sql.from() and provide the following parameters:
- driverName: postgres
- dataSourceName: See data source name
- query: PSQL query to execute

import "sql"

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

PostgreSQL data source name

The postgres driver uses the following DSN syntax (also known as a connection string):

postgres://username:password@localhost:5432/dbname?param=value

PostgreSQL to Flux data type conversion

sql.from() converts PostgreSQL data types to Flux data types.

PostgreSQL data type	Flux data type
INT, BIGINT, SMALLINT, TINYINT, INT2, INT4, INT8, SERIAL2, SERIAL4, SERIAL8	int
FLOAT4, FLOAT8	float
DATE, TIME, TIMESTAMP	time
BOOL	bool
TEXT	string

{{% caption %}} All other PostgreSQL data types are converted to strings. {{% /caption %}}