Skip to main content

MONGODB COMMANDS

CREATE TABLE USERS (a Number, b Number)     Implicit or use MongoDB::createCollection().
INSERT INTO USERS VALUES(1,1)
$db->users->insert(array("a" => 1, "b" => 1));
SELECT a,b FROM users
$db->users->find(array(), array("a" => 1, "b" => 1));
SELECT * FROM users WHERE age=33
$db->users->find(array("age" => 33));
SELECT a,b FROM users WHERE age=33
$db->users->find(array("age" => 33), array("a" => 1, "b" => 1));
SELECT a,b FROM users WHERE age=33 ORDER BY name
$db->users->find(array("age" => 33), array("a" => 1, "b" => 1))->sort(array("name" => 1));
SELECT * FROM users WHERE age>33
$db->users->find(array("age" => array('$gt' => 33)));
SELECT * FROM users WHERE age<33
$db->users->find(array("age" => array('$lt' => 33)));
SELECT * FROM users WHERE name LIKE "%Joe%"
$db->users->find(array("name" => new MongoRegex("/Joe/")));
SELECT * FROM users WHERE name LIKE "Joe%"
$db->users->find(array("name" => new MongoRegex("/^Joe/")));
SELECT * FROM users WHERE age>33 AND age<=40
$db->users->find(array("age" => array('$gt' => 33, '$lte' => 40)));
SELECT * FROM users ORDER BY name DESC
$db->users->find()->sort(array("name" => -1));
CREATE INDEX myindexname ON users(name)
$db->users->ensureIndex(array("name" => 1));
CREATE INDEX myindexname ON users(name,ts DESC)
$db->users->ensureIndex(array("name" => 1, "ts" => -1));
SELECT * FROM users WHERE a=1 and b='q'
$db->users->find(array("a" => 1, "b" => "q"));
SELECT * FROM users LIMIT 10 SKIP 20
$db->users->find()->limit(10)->skip(20);
SELECT * FROM users WHERE a=1 or b=2
$db->users->find(array('$or' => array(array("a" => 1), array("b" => 2))));
SELECT * FROM users LIMIT 1
$db->users->find()->limit(1);
EXPLAIN SELECT * FROM users WHERE z=3
$db->users->find(array("z" => 3))->explain()
SELECT DISTINCT last_name FROM users
$db->command(array("distinct" => "users", "key" => "last_name"));
SELECT COUNT(*y) FROM users
$db->users->count();
SELECT COUNT(*y) FROM users where AGE > 30
$db->users->find(array("age" => array('$gt' => 30)))->count();
SELECT COUNT(AGE) from users
$db->users->find(array("age" => array('$exists' => true)))->count();
UPDATE users SET a=1 WHERE b='q'
$db->users->update(array("b" => "q"), array('$set' => array("a" => 1)));
UPDATE users SET a=a+2 WHERE b='q'
$db->users->update(array("b" => "q"), array('$inc' => array("a" => 2)));
DELETE FROM users WHERE z="abc"
$db->users->remove(array("z" => "abc"));

Comments

Popular posts from this blog

Get the Current url in ruby on rails

request.refererrequest.fullpathrequest.fullpath.split("?")[0]request.referer or request.env['HTTP_REFERER'] your controller to get the referer url. 

--------------------
request.original_url
request.url
request.host_with_port
<link rel="canonical" href="<%= request.url %>" />
<%=request.path%>
How can I get the current absolute URL in my Ruby on Rails view?
The request.request_uri only returns the relative URL.
request.env['REQUEST_URI']

 For Rails 3.2 or Rails 4 you should use request.original_url to get the current URL. More detail.

For Rails 3: You want "#{request.protocol}#{request.host_with_port}#{request.fullpath}", since request.url is now deprecated.

For Rails 2: You want request.url instead of request.request_uri. This combines the protocol (usually http://) with the host, and request_uri to give you the full address

Gem::LoadError (Specified 'mysql2' for database adapter, but the gem is not loaded. Add `gem 'mysql2'` to your Gemfile (and ensure its version is at the minimum required by ActiveRecord).?

Gem::LoadError (Specified 'mysql2' for database adapter, but the gem is not loaded. Add `gem 'mysql2'` to your Gemfile (and ensure its version is at the minimum required by ActiveRecord).) In rails?


1)change the gemfile in mysql version
 gem 'mysql2'

2)Change to mysql2 version
 gem 'mysql2','0.3.20'

Active Scaffold : Add radio buttons to your form ruby on rails ?

Active Scaffold : Add radio buttons to your form ruby on rails ?

The way to add radio buttons to your active scaffold create/update from is as shown below

#Controller

class UsersController < ApplicationController
active_scaffold :user do |config|
config.label = “Users”
config.columns = [:name, :gender]
config.columns[:gender].form_ui = :radio
config.columns[:gender].options[:options] = [['Male', '1'], ['Female','2']]
end
end