169 lines
6.7 KiB
Markdown
169 lines
6.7 KiB
Markdown
#node-postgres
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Non-blocking PostgreSQL client for node.js. Pure JavaScript and native libpq bindings. Active development, well tested, and production use.
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## Installation
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npm install pg
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## Examples
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### Simple, using built-in client pool
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var pg = require('pg');
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//or native libpq bindings
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//var pg = require('pg').native
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var conString = "tcp://postgres:1234@localhost/postgres";
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//error handling omitted
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pg.connect(conString, function(err, client) {
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client.query("SELECT NOW() as when", function(err, result) {
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console.log("Row count: %d",result.rows.length); // 1
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console.log("Current year: %d", result.rows[0].when.getYear());
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});
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});
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### Evented api
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var pg = require('pg'); //native libpq bindings = `var pg = require('pg').native`
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var conString = "tcp://postgres:1234@localhost/postgres";
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var client = new pg.Client(conString);
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client.connect();
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//queries are queued and executed one after another once the connection becomes available
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client.query("CREATE TEMP TABLE beatles(name varchar(10), height integer, birthday timestamptz)");
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client.query("INSERT INTO beatles(name, height, birthday) values($1, $2, $3)", ['Ringo', 67, new Date(1945, 11, 2)]);
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client.query("INSERT INTO beatles(name, height, birthday) values($1, $2, $3)", ['John', 68, new Date(1944, 10, 13)]);
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//queries can be executed either via text/parameter values passed as individual arguments
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//or by passing an options object containing text, (optional) parameter values, and (optional) query name
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client.query({
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name: 'insert beatle',
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text: "INSERT INTO beatles(name, height, birthday) values($1, $2, $3)",
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values: ['George', 70, new Date(1946, 02, 14)]
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});
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//subsequent queries with the same name will be executed without re-parsing the query plan by postgres
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client.query({
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name: 'insert beatle',
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values: ['Paul', 63, new Date(1945, 04, 03)]
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});
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var query = client.query("SELECT * FROM beatles WHERE name = $1", ['John']);
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//can stream row results back 1 at a time
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query.on('row', function(row) {
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console.log(row);
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console.log("Beatle name: %s", row.name); //Beatle name: John
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console.log("Beatle birth year: %d", row.birthday.getYear()); //dates are returned as javascript dates
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console.log("Beatle height: %d' %d\"", Math.floor(row.height/12), row.height%12); //integers are returned as javascript ints
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});
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//fired after last row is emitted
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query.on('end', function() {
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client.end();
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});
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### Example notes
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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.
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All examples will work with the pure javascript bindings (currently default) or the libpq native (c/c++) bindings (currently in beta)
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To use native libpq bindings replace `require('pg')` with `require('pg').native`.
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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.
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### Info
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* pure javascript client and native libpq bindings share _the same api_
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* _heavily_ tested
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* the same suite of 200+ integration tests passed by both javascript & libpq bindings
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* benchmark & long-running memory leak tests performed before releases
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* tested with with
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* postgres 8.x, 9.x
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* Linux, OS X
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* node 2.x & 4.x
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* row-by-row result streaming
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* built-in (optional) connection pooling
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* responsive project maintainer
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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
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* extensible js<->postgresql data-type coercion
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* query queue
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* active development
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* fast
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* close mirror of the node-mysql api for future multi-database-supported ORM implementation ease
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### Contributors
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Many thanks to the following:
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* [creationix](https://github.com/creationix)
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* [felixge](https://github.com/felixge)
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* [pshc](https://github.com/pshc)
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* [pjornblomqvist](https://github.com/bjornblomqvist)
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* [JulianBirch](https://github.com/JulianBirch)
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* [ef4](https://github.com/ef4)
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* [napa3um](https://github.com/napa3um)
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* [drdaeman](https://github.com/drdaeman)
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* [booo](https://github.com/booo)
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* [neonstalwart](https://github.com/neonstalwart)
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* [homme](https://github.com/homme)
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* [bdunavant](https://github.com/bdunavant)
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* [tokumine](https://github.com/tokumine)
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* [shtylman](https://github.com/shtylman)
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* [cricri](https://github.com/cricri)
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* [AlexanderS](https://github.com/AlexanderS)
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* [ahtih](https://github.com/ahtih)
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* [chowey](https://github.com/chowey)
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* [kennym](https://github.com/kennym)
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## Documentation
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Documentation is a work in progress primarily taking place on the github WIKI
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### [Documentation](https://github.com/brianc/node-postgres/wiki)
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### __PLEASE__ check out the WIKI
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If you have a question, post it to the FAQ section of the WIKI so everyone can read the answer
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## Production Use
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* [yammer.com](http://www.yammer.com)
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* [bayt.com](http://bayt.com)
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_if you use node-postgres in production and would like your site listed here, fork & add it_
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## Help
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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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## License
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Copyright (c) 2010 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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