158 lines
6.1 KiB
Markdown
158 lines
6.1 KiB
Markdown
#node-postgres
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[](http://travis-ci.org/brianc/node-postgres)
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[](https://david-dm.org/brianc/node-postgres)
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PostgreSQL client for node.js. Pure JavaScript and optional native libpq bindings.
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## Install
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```sh
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$ npm install pg
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```
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## Examples
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### Client pooling
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Generally 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.
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```javascript
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var pg = require('pg');
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var conString = "postgres://username:password@localhost/database";
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//this initializes a connection pool
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//it will keep idle connections open for a (configurable) 30 seconds
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//and set a limit of 10 (also configurable)
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pg.connect(conString, function(err, client, done) {
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if(err) {
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return console.error('error fetching client from pool', err);
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}
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client.query('SELECT $1::int AS number', ['1'], function(err, result) {
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//call `done()` to release the client back to the pool
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done();
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if(err) {
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return console.error('error running query', err);
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}
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console.log(result.rows[0].number);
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//output: 1
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});
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});
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```
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[Check this out for the get up and running quickly example](https://github.com/brianc/node-postgres/wiki/Example)
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### Client instance
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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.
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```javascript
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var pg = require('pg');
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var conString = "postgres://username:password@localhost/database";
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var client = new pg.Client(conString);
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client.connect(function(err) {
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if(err) {
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return console.error('could not connect to postgres', err);
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}
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client.query('SELECT NOW() AS "theTime"', function(err, result) {
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if(err) {
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return console.error('error running query', err);
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}
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console.log(result.rows[0].theTime);
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//output: Tue Jan 15 2013 19:12:47 GMT-600 (CST)
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client.end();
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});
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});
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```
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## [More Documentation](https://github.com/brianc/node-postgres/wiki)
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## Native Bindings
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To install the [native bindings](https://github.com/brianc/node-pg-native.git):
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```sh
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$ npm install pg pg-native
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```
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node-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.
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To use the native bindings, first install [pg-native](https://github.com/brianc/node-pg-native.git). Once pg-native is installed, simply replace `require('pg')` with `require('pg').native`.
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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.
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## Features
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* pure JavaScript client and native libpq bindings share _the same api_
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* optional connection pooling
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* extensible js<->postgresql data-type coercion
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* supported PostgreSQL features
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* parameterized queries
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* named statements with query plan caching
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* async notifications with `LISTEN/NOTIFY`
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* bulk import & export with `COPY TO/COPY FROM`
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## Contributing
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__We love contributions!__
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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.
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I will __happily__ accept your pull request if it:
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- __has tests__
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- looks reasonable
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- does not break backwards compatibility
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Information about the testing processes is in the [wiki](https://github.com/brianc/node-postgres/wiki/Testing).
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Open source belongs to all of us, and we're all invited to participate!
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## Support
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If at all possible when you open an issue please provide
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- version of node
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- version of postgres
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- smallest possible snippet of code to reproduce the problem
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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!
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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.
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I usually tweet about any important status updates or changes to node-postgres on twitter.
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Follow me [@briancarlson](https://twitter.com/briancarlson) to keep up to date.
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## Extras
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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.
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Entire list can be found on [wiki](https://github.com/brianc/node-postgres/wiki/Extras)
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## License
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Copyright (c) 2010-2016 Brian Carlson (brian.m.carlson@gmail.com)
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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