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POHow do I use node-postgres in a server?
 

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    <p>I'm writing a Node.js web server that uses a Postgres database. I used to connect on each new request like this:</p> <pre><code>app.get('/', function (req, res) { pg.connect(pgconnstring, function (err, client) { // ... }); }); </code></pre> <p>But after a few requests, I noticed 'out of memory' errors on Heroku when trying to connect. My database has only 10 rows, so I don't see how this could be happening. All of my database access is of this form:</p> <pre><code>client.query('SELECT * FROM table', function (err, result) { if (err) { res.send(500, 'database error'); return; } res.set('Content-Type', 'application/json'); res.send(JSON.stringify({ data: result.rows.map(makeJSON) })); }); </code></pre> <p>Assuming that the memory error was due to having several persistent connections to the database, I switched to a style I saw in several <code>node-postgres</code> examples of connecting only once at the top of the file:</p> <pre><code>var client = new pg.Client(pgconnstring); client.connect(); app.get('/', function (req, res) { // ... }); </code></pre> <p>But now my requests hang (indefinitely?) when I try to execute a query after the connection is disrupted. (I simulated it by killing a Postgres server and bringing it back up.)</p> <p>So how do I do one of these?</p> <ol> <li>Properly pool Postgres connections so that I can 'reconnect' every time without running out of memory.</li> <li>Have the global client automatically reconnect after a network failure.</li> </ol>
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