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Increment value in mysql update query
...l_query("
UPDATE member_profile
SET points = points + 1
WHERE user_id = '".$userid."'
");
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Setting Environment Variables for Node to retrieve
...les (in this case) are being used to pass credentials to your application. USER_ID and USER_KEY can both be accessed from process.env.USER_ID and process.env.USER_KEY respectively. You don't need to edit them, just access their contents.
It looks like they are simply giving you the choice between l...
Rest with Express.js nested router
...(function(req, res) {})
.post(function(req, res) {})
userRouter.route('/:user_id')
.get(function() {})
itemRouter.route('/')
.get(function(req, res) {})
.post(function(req, res) {})
itemRouter.route('/:item_id')
.get(function(req, res) {
return res.send(req.params);
});
app.use('/u...
Facebook database design?
... Schema:
CREATE TABLE IF NOT EXISTS `friends` (
`id` int(11) NOT NULL,
`user_id` int(11) NOT NULL,
`friend_id` int(11) NOT NULL
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;
Friends of Friends Query:
(
select friend_id
from friends
where user_id = 1
) uni...
MySQL join with where clause
...s.category_id = categories.category_id
and user_category_subscriptions.user_id =1
See, with an inner join, putting a clause in the join or the where is equivalent. However, with an outer join, they are vastly different.
As a join condition, you specify the rowset that you will be joining to t...
Pandas read_csv low_memory and dtype options
...the last value.
Consider the example of one file which has a column called user_id.
It contains 10 million rows where the user_id is always numbers.
Since pandas cannot know it is only numbers, it will probably keep it as the original strings until it has read the whole file.
Specifying dtypes (shou...
Add a reference column migration in Rails 4
...ake db:migrate.
This migration will take care of adding a new column named user_id to uploads table (referencing id column in users table), PLUS it will also add an index on the new column.
UPDATE [For Rails 4.2]
Rails can’t be trusted to maintain referential integrity; relational databases come...
Separation of business logic and data access in django
...d each command is represented as a function.
services.py
def activate_user(user_id):
user = User.objects.get(pk=user_id)
# set active flag
user.active = True
user.save()
# mail user
send_mail(...)
# etc etc
Using forms
The other way is to use a Django Form for each co...
Pandas aggregate count distinct
...
How about either of:
>>> df
date duration user_id
0 2013-04-01 30 0001
1 2013-04-01 15 0001
2 2013-04-01 20 0002
3 2013-04-02 15 0002
4 2013-04-02 30 0002
>>> df.groupby("date").agg({"duration": np.sum, ...
Rails 3 migrations: Adding reference column?
... is kind of lost.
So I would do like this instead:
rails g migration add_user_id_to_tester user_id:integer
And then manually add belongs_to :user in the Tester model
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