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Updated Example (markdown)

brianc 2013-03-07 12:48:44 -08:00
parent d2b8fd59aa
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Example.md

@ -3,44 +3,27 @@
You'll need to first "create table visit (date date)" in your postgres database
```javascript
var sys = require('sys');
var http = require('http');
var pg = require('pg').native;
var connectionString = "postgres://postgres:abcd@localhost:5432/postgres";
var pg = require('pg');
var server = http.createServer(function(req, res) {
var start = new Date();
if(req.url != "/") {
res.writeHead(404);
return res.end("404'd")
}
var after = function(callback) {
return function(err, queryResult) {
if(err) {
res.writeHead(500, {"Content-Type" : "text/plain"});
return res.end("Error! " + sys.inspect(err))
}
callback(queryResult)
}
}
pg.connect(connectionString, after(function(client) {
client.query("SELECT COUNT(date) as count FROM visit", after(function(result) {
client.query("SELECT date FROM visit ORDER BY date DESC LIMIT 1", after(function(dateResult) {
var text = ["<html><head><title>Postgres Node Hello</title><body>",
"<p>I have been viewed ", result.rows[0].count, " times</p>",
"<p>Most recently I was viewed at ", (dateResult.rows.length !== 0 ? dateResult.rows[0].date : ""), "</p>",
'you can view the source <a href="http://github.com/brianc/node-postgres">on github</a>',
'<p>this page took ~',
(new Date())-start,
' milliseconds to render</p>',
"</body></html>"].join('')
res.writeHead(200, {"Content-Type": "text/html"})
res.end(text);
client.query('INSERT INTO visit(date) VALUES($1)', [new Date()])
}))
}))
}))
var server = http.createServer(function(req, res, next) {
pg.connect(function(err, client, done) {
var handleError = function(err) {
if(!err) return false;
done(client);
next(err);
return true;
};
client.query('INSERT INTO visit (date) VALUES ($1)', [new Date()], function(err, result) {
if(handleError(err)) return;
client.query('SELECT COUNT(date) AS count FROM visit', function(err, result) {
if(handleError(err)) return;
done();
res.writeHead(200, {'content-type': 'text/html'});
res.end('You are visitor number ' + result.rows[0].count);
});
});
});
})
server.listen(3001)