#node-postgres
PostgreSQL client for node.js. Pure JavaScript and optional native libpq bindings.
$ npm install pgGenerally you will access the PostgreSQL server through a pool of clients. A client takes a non-trivial amount of time to establish a new connection. A client also consumes a non-trivial amount of resources on the PostgreSQL server - not something you want to do on every http request. Good news: node-postgres ships with built in client pooling.
var pg = require('pg');
var conString = "postgres://username:password@localhost/database";
//this starts initializes a connection pool
//it will keep idle connections open for a (configurable) 30 seconds
//and set a limit of 20 (also configurable)
pg.connect(conString, function(err, client, done) {
if(err) {
return console.error('error fetching client from pool', err);
}
client.query('SELECT $1::int AS number', ['1'], function(err, result) {
//call `done()` to release the client back to the pool
done();
if(err) {
return console.error('error running query', err);
}
console.log(result.rows[0].number);
//output: 1
});
});Check this out for the get up and running quickly example
Sometimes you may not want to use a pool of connections. You can easily connect a single client to a postgres instance, run some queries, and disconnect.
var pg = require('pg');
var conString = "postgres://username:password@localhost/database";
var client = new pg.Client(conString);
client.connect(function(err) {
if(err) {
return console.error('could not connect to postgres', err);
}
client.query('SELECT NOW() AS "theTime"', function(err, result) {
if(err) {
return console.error('error running query', err);
}
console.log(result.rows[0].theTime);
//output: Tue Jan 15 2013 19:12:47 GMT-600 (CST)
client.end();
});
});To install the native bindings:
$ npm install pg pg-nativenode-postgres contains a pure JavaScript protocol implementation which is quite fast, but you can optionally use native bindings for a 20-30% increase in parsing speed. Both versions are adequate for production workloads.
To use the native bindings, first install pg-native. Once pg-native is installed, simply replace require('pg') with require('pg').native.
node-postgres abstracts over the pg-native module to provide exactly the same interface as the pure JavaScript version. No other code changes are required. If you find yourself having to change code other than the require statement when switching from require('pg') to require('pg').native please report an issue.
- pure JavaScript client and native libpq bindings share the same api
- optional connection pooling
- extensible js<->postgresql data-type coercion
- supported PostgreSQL features
- parameterized queries
- named statements with query plan caching
- async notifications with
LISTEN/NOTIFY - bulk import & export with
COPY TO/COPY FROM
We love contributions!
If you need help getting the tests running locally or have any questions about the code when working on a patch please feel free to email me or gchat me.
I will happily accept your pull request if it:
- has tests
- looks reasonable
- does not break backwards compatibility
Information about the testing processes is in the wiki.
Open source belongs to all of us, and we're all invited to participate!
If at all possible when you open an issue please provide
- version of node
- version of postgres
- smallest possible snippet of code to reproduce the problem
Usually I'll pop the code into the repo as a test. Hopefully the test fails. Then I make the test pass. Then everyone's happy!
If you need help or run into any issues getting node-postgres to work on your system please report a bug or contact me directly. I am usually available via google-talk at my github account public email address.
I usually tweet about any important status updates or changes to node-postgres on twitter.
Follow me @briancarlson to keep up to date.
node-postgres is by design pretty light on abstractions. These are some handy modules we've been using over the years to complete the picture:
- brianc/node-pg-native - Simple interface abstraction on top of libpq
- brianc/node-pg-query-stream - Query results from node-postgres as a readable (object) stream
- brianc/node-pg-cursor - Query cursor extension for node-postgres
- brianc/node-pg-copy-streams - COPY FROM / COPY TO for node-postgres. Stream from one database to another, and stuff.
- brianc/node-postgres-pure - node-postgres without any of the C/C++ stuff
- brianc/node-pg-types - Type parsing for node-postgres
- Suor/pg-bricks - A higher level wrapper around node-postgres to handle connection settings, sql generation, transactions and ease data access.
- grncdr/node-any-db - Thin and less-opinionated database abstraction layer for node.
- brianc/node-sql - SQL generation for node.js
- hiddentao/squel - SQL query string builder for Javascript
- CSNW/sql-bricks - Transparent, Schemaless SQL Generation
- datalanche/node-pg-format - Safely and easily create dynamic SQL queries with this Node implementation of PostgreSQL format().
- iceddev/pg-transact - A nicer API on node-postgres transactions
- sehrope/node-pg-db - Simpler interface, named parameter support, transaction management and event hooks.
- vitaly-t/pg-promise - Use node-postgres via Promises/A+.
- pg-then A tiny wrapper of
pgfor promise api. - acarl/pg-restify - Creates a generic REST API for a postgres database using restify.
Copyright (c) 2010-2015 Brian Carlson (brian.m.carlson@gmail.com)
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