#node-postgres Non-blocking PostgreSQL client for node.js. Pure JavaScript and native libpq bindings. ## Installation npm install pg ## Examples All examples will work with the pure javascript bindings (currently default) or the libpq native (c/c++) bindings (currently in beta) To use native libpq bindings replace `require('pg')` with `require('pg').native`. The two share the same interface so __no other code changes should be required__. If you find yourself having to change code other than the require statement when switching from `pg` to `pg.native`, please report an issue. node-postgres supports both an 'event emitter' style API and a 'callback' style. The callback style is more concise and generally preferred, but the evented API can come in handy. They can be mixed and matched. The only events which do __not__ fire when callbacks are supplied are the `error` events, as they are to be handled by the callback function. ### Simple, using built-in client pool var pg = require('pg'); //or native libpq bindings //var pg = require('pg').native var conString = "tcp://postgres:1234@localhost/postgres"; //error handling omitted pg.connect(conString, function(err, client) { client.query("SELECT NOW() as when", function(err, result) { console.log("Row count: %d",result.rows.length); // 1 console.log("Current year: %d", result.rows[0].when.getYear()); }); }); ### Evented api var pg = require('pg'); //native libpq bindings = `var pg = require('pg').native` var conString = "tcp://postgres:1234@localhost/postgres"; var client = new pg.Client(conString); client.connect(); //queries are queued and executed one after another once the connection becomes available client.query("CREATE TEMP TABLE beatles(name varchar(10), height integer, birthday timestamptz)"); client.query("INSERT INTO beatles(name, height, birthday) values($1, $2, $3)", ['Ringo', 67, new Date(1945, 11, 2)]); client.query("INSERT INTO beatles(name, height, birthday) values($1, $2, $3)", ['John', 68, new Date(1944, 10, 13)]); //queries can be executed either via text/parameter values passed as individual arguments //or by passing an options object containing text, (optional) parameter values, and (optional) query name client.query({ name: 'insert beatle', text: "INSERT INTO beatles(name, height, birthday) values($1, $2, $3)", values: ['George', 70, new Date(1946, 02, 14)] }); //subsequent queries with the same name will be executed without re-parsing the query plan by postgres client.query({ name: 'insert beatle', values: ['Paul', 63, new Date(1945, 04, 03)] }); var query = client.query("SELECT * FROM beatles WHERE name = $1", ['john']); //can stream row results back 1 at a time query.on('row', function(row) { console.log(row); console.log("Beatle name: %s", row.name); //Beatle name: John console.log("Beatle birth year: %d", row.birthday.getYear()); //dates are returned as javascript dates console.log("Beatle height: %d' %d\"", Math.floor(row.height/12), row.height%12); //integers are returned as javascript ints }); //fired after last row is emitted query.on('end', function() { client.end(); }); ### Info * a pure javascript client and native libpq bindings with _the same api_ * _heavily_ tested * the same suite of 200+ integration tests passed by both javascript & libpq bindings * benchmark & long-running memory leak tests performed before releases * tested with with * postgres 8.x, 9.x * Linux, OS X * node 2.x & 4.x * row-by-row result streaming * optional, built-in connection pooling * responsive project maintainer * supported PostgreSQL features * parameterized queries * named statements with query plan caching * async notifications * extensible js<->postgresql data-type coercion * query queue * active development * fast * No dependencies (other than PostgreSQL) * No monkey patching * Tried to mirror the node-mysql api as much as possible for future multi-database-supported ORM implementation ease ### Contributors Many thanks to the following: * [creationix](https://github.com/creationix) * [felixge](https://github.com/felixge) * [pshc](https://github.com/pshc) * [pjornblomqvist](https://github.com/bjornblomqvist) * [JulianBirch](https://github.com/JulianBirch) ## Documentation Still a work in progress, I am trying to flesh out the wiki... ### [Documentation](https://github.com/brianc/node-postgres/wiki) ### __PLEASE__ check out the WIKI ## Help 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. ## License Copyright (c) 2010 Brian Carlson (brian.m.carlson@gmail.com) Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.