postgresql-service

A simple wrapper around node-pg

This simple service covers my own usage of the pg module. I only use transactions and queries and I use dependency injection with Knifecycle.

It also sets up a few tweaks I have to do for each projects like avoiding to mess up with dates.

Tagged templates

You may like to use pgsqwell with this module.

API

initPGService(services) ⇒ Promise.<Object>

Instantiate the pg service

Kind: global function
Returns: Promise.<Object> - A promise of the pg service

Param	Type	Description
services	Object	The services to inject
[services.log]	function	A logging function
[services.PG_URL_ENV_NAME]	Object	The environment variable name in which to pick-up the PG url
[services.ENV]	Object	An environment object
services.PG	Object	A pg compatible configuration object

Example

import initPGService from 'postgresql-service';

const { service: pg, dispose } = await initPGService({
  log: console.log.bind(console),
  ENV: process.env, // Proxy the PG_URL env var
});

const result = pg.query('SELECT 1');

await dispose();

• initPGService(services) ⇒ Promise.<Object>
  • ~query() ⇒ String | Object
  • ~queries() ⇒ Array.<String> | Object
  • ~transaction() ⇒ Array.<String> | Object

initPGService~query() ⇒ String | Object

Executes the given query

Kind: inner method of initPGService
Returns: String - Query to executeObject - Arguments hash for the query
Example

const { rows, fields } = await pg.query(
   'SELECT * FROM users WHERE user = $$userId',
   { userId: 1 }
);

initPGService~queries() ⇒ Array.<String> | Object

Executes the given queries in parallel (using the connections pool)

Kind: inner method of initPGService
Returns: Array.<String> - Queries to executeObject - Arguments hashes for the queries
Example

const [{ rows, fields }, { rows2, fields2 }] = await pg.queries([
   'SELECT * FROM users WHERE user = $$userId',
   'SELECT * FROM users WHERE user = $$userId',
], { userId: 1 });

initPGService~transaction() ⇒ Array.<String> | Object

Executes the given queries in a single transaction

Kind: inner method of initPGService
Returns: Array.<String> - Queries to executeObject - Arguments hashes for the queries
Example

const [, { rows, fields }] = await pg.transaction([
   'UPDATE users SET isActive = true WHERE user = $$userId',
   'SELECT * FROM users WHERE user = $$userId',
], { userId: 1 });

Authors

• Nicolas Froidure

License

MIT