banker

import com.mongodb.Mongo;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.BasicDBObject;
import com.mongodb.DBObject;
import com.mongodb.DBCursor;
import com.mongodb.WriteConcern;

public class Test {

banker

var customerAggregations = provider.AggregationSet<Customer>();


customerAggregations.Apply(x =>x.RecordShell.Age + 3,
    "AgeInThreeYears");

banker

    public static String script = "" +
            "local key = KEYS[1]" +
            "local field = ARGV[1]" +
            "local value = ARGV[2]" +
            "local op = ARGV[3]" +
            "local current = redis.call('hget', key, field)" +
            "if (current == null) then " +
            "    redis.call('hset', key, field, value)" +
            "elseif op == '>' then" +
            "  if tonumber(value) > tonumber(current) then" +

banker

Keybase proof

I hereby claim:

• I am banker on github.
• I am hwaet (https://keybase.io/hwaet) on keybase.
• I have a public key ASAz4KeG_T7Aeq6EJ727hEqaMlBSGzGBzx1iwJEONZLoQwo

To claim this, I am signing this object:

banker

# mongo_template.rb
# fork of Ben Scofield's Rails MongoMapper Template (http://gist.github.com/181842)
#
# To use:
#  rails project_name -m http://gist.github.com/gists/219223.txt

# remove unneeded defaults
run "rm public/index.html"
run "rm public/images/rails.png"
run "rm public/javascripts/controls.js"

banker

# with multiple collections + commands for renaming back the collections

require 'mongo'

# Stop writing to your database.
# Then, for each collection:
# Specify the DB and COLLECTION you want to convert.
# Will insert all modified documents into a new collection
# called 'new_' + old_collection_name.
# Then you can delete the old collection and rename the new one

banker

x = 10000.times.to_a

a,b,c = x.dup, x.dup, x.dup

Benchmark.measure { 1000.times { out = []; out += a; out += b; out +=c; out.uniq! } }

Benchmark.measure { 1000.times { out = Set.new; out += a; out += b; out +=c; } }

Benchmark.measure { 1000.times { out = {}; a.each {|e| out[e] ||= 1}; b.each {|e| out[e] ||= 1}; c.each {|e| out[e] ||= 1}; } }

banker

> db.f.save({u: 1, v: 2})
> db.f.save({u: 2, v: 2})
> db.f.save({u: 1, v: 5})
> db.f.save({u: 2, v: 10})
> m = function() { emit(this.u, this.v) }
function () {
    emit(this.u, this.v);
}
> r = function(k, vs) { r = 0; vs.forEach(function(v) { r += v; }); return r; }
function (k, vs) {

banker

#include <stdio.h>
#include "mongo.h"

int main() {
  mongo conn[1];
  int status = mongo_connect( conn, "127.0.0.1", 27017 );

  if( status != MONGO_OK ) {
      switch ( conn->err ) {
        case MONGO_CONN_SUCCESS:    printf( "connection succeeded\n" ); break;

banker

MongoDB Pointers for Rubyists

Kyle Banker

DC Ruby | September, 2011

THE RAILS

1. Is MongoDB a good choice for your Rails project?