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    <p>It looks like client (pg.Client) is declared outside the scope of a request, this is probably your issue. It's hard to tell from the code snippet, but it looks like you might have issues with scoping and how async callback control flow works in general, e.g. calling res.end() while callbacks are still in the IO queue. This is totally legal with node, just not sure that is your intent.</p> <p>It is preferred to use pg.connect which returns a client. see <a href="https://github.com/brianc/node-postgres/wiki/pg" rel="noreferrer">https://github.com/brianc/node-postgres/wiki/pg</a></p> <pre><code>var pg = require('pg'); var server = http.createServer(function (req, res) { var url = parse(req.url); if (url.pathname =='/'){ (...) }else{ var slash_index = url.pathname.indexOf('/',1); var command = url.pathname.slice(1,slash_index); if (command =='restart'){ res.write('restarting server please wait'); } else if (command == 'drop-db'){ console.log('drop-db'); pg.connect(conString, function(err, client) { console.log('connect'); var query = client.query("select datname from pg_database;", function(err, result) { if (err) throw err; console.log('callback'); }); query.on('end', function() { console.log('close'); // client.end(); -- not needed, client will return to the pool on drain }); }); } else{ res.write('unknown command : '+ command); } // these shouldn't be here either if you plan to write to res from within the pg // callback res.write('\n'); res.end(); } }).listen(5337); </code></pre>
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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