How to Chunk Large Files in Swift (4.1) It takes a bit of work but this is the solution I found that finally worked, thanks to this Stack Overflow thread https://stackoverflow.com/questions/46464177/split-data-in-chunks-and-upload-to-server The example ...

If you want to find the location of your log file in Postgres, you'll need to hop into a Psql session.. psql dbname Then it's as simple as running.. show data_directory ; Which will output the data directory, in my case.. /Users/sea...

If you're working with SQLAlchemy, the best database driver for Python, and want to see only SQL syntax errors, you need to use the StatementError exception class. On it, is an attribute `orig`, that contains just the SQL syntax error... and not any data...

Here is some code just in case you want to look at and query the queries hitting your MySQL database. Enter this from the mysql client console. mysql> SET GLOBAL log_output = 'TABLE' mysql> SET GLOBAL general_log = 'ON'; mysql> select event_ti...

Unfortunately PHP's PDO constructor doesn't take a database connection url (in a format that Heroku makes available as a config var) as an argument. It has its own, rather odd syntax. However, it's easy enough to extract url parts with the `parse_url`...

Here is a code snippet that demonstrates how to set up a __ManyToMany through__ relationship in Django. In Rails, the equivalent would be called a __has_many through__ association. If you set the __through__ argument on the ManyToManyField, Django wil...

Here is a little snippet that will return new signups (or new records) for today select id, email, created_at::date date from signups where email not in (select distinct email from signups where created_at < current_date)

Here are a few snippets for cross database queries. It's important to note that you must be explicit in enumerating the columns and types you are querying. Otherwise, things will probably not work as expected. -- enable extension create extension db...

Heroku is awesome! Let's say we want to copy a production database to a staging database. We can use the `pg:backups:restore` command to accomplish this. Here is an example. For the source database we are using the `production-app-name` and for stagi...

When Heroku creates a dump file of your Postgres database it uses the `-Fc` option It is equivalent to running pg_dump -Fc -d name_of_db > name_of_db.dump This command will let you import your database with the `pg_restore` command pg_rest...

Here is a quick and dirty way to destructure dictionaries in [Python] d = {'a':'Apple', 'b':'Banana','c':'Carrot'} a,b,c = [d[k] for k in ('a', 'b','c')] a == 'Apple' b == 'Banana' c == 'Carrot'

If you run into this error when trying to create a user in mysql, chances are you already have this user account created. create user 'someuser'@'localhost' identified by 'somepassword'; ERROR 1396 (HY000): Operation CREATE USER failed for 'someuser...

This query and pattern will return urls in text all within a single SQL query. select substring(column_name from '.*://([^/]*)') as domain_name from table_name; And here it is in a larger query, say for retrieving page view counts for referrers. ...

If you get this error message ActiveRecord::ConnectionTimeoutError could not obtain a database connection within 5.000 seconds (waited 5.001 seconds) Try closing the connection after each request using "after" in Sintara. # app.rb after { A...

Let's create a table that will hold some dummy data. > create table fruits (id serial primary key, name varchar, color varchar); > insert into fruits (name, color) values ('apple', 'red'); > insert into fruits (name, color) values ('ap...

If you have an string of numbers like "1,2,3" and you want to turn it into an array of integers you need to cast it into an integer array type. "{1,2,3}"::int[] This is commonly used together when grabbing a set using the ANY clause. sele...

It's trivial to export data from a mysql database with Ruby and ActiveRecord. All you have to do is establish a connection and define a class that represents the table. require 'rubygems' require 'active_record' ActiveRecord::Base.establish_con...

require 'yaml' # Nested YAML structure from something-nested.yml # # nested: # key: value # key_two: value_two # Procedural Approach to building a single Hash from nested YAML data structure. @yaml = YAML.load_file("something-nested...

Make a directory ( it can anywhere ) called baks/mysql mkdir -p /baks/mysql Create a file (it can be anywhere) called /root/mysql_backups.sh and put this script in it #!/bin/bash # modify the following to suit your environment export DB...

This post is inspired by http://pupeno.com/blog/really-resetting-the-database/#comment-1179. But as my blog mostly serves as a reference for my future self, I'd like to reprint this little snippet of code here as well. namespace :db do desc "Crush a...

Here is a text file containing every high school in the United States(2005), including city, state, zip code and high school name. us_high_schools_pd

It's not immediately apparent how to import/export the links in your Wordpress blogroll. One would expect that the import/export tool, used to backup/restore Wordpress posts and pages would handle this functionality as well. But the import/export tool has...

Output .sql file for MySQL but without the drop table syntax before table name use the --skip-add-drop-table flag mysqldump -u root -p database_name --skip-add-drop-table --skip-lock-tables > database_name.sql

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MySQL doesn't support having two columns with time stamping on both initialization and/or on updating at the same time. It would be nice to be able to do *this* where the created_at column gets the current_timestamp on initialization and the updated_at ge...

My friend Andy made this 3D rendering of me using LIDAR (Laser Detection and Ranging). In the first image you can see me holding up my hand along with a number of file cabinets. The cube in the center is a table used to calibrate the device. In this sh...

Here is my first data visualization. I used the Processing programming language and an SVG map of the United States. ...

Get the plugin like so... script/plugin install git://github.com/adamwiggins/yaml_db.git This command will dump your data rake db:data:dump And load it back rake db:data:load Beautiful :) More info here http://blog.heroku.com/archives/2007/11/23/yam...

I ran into the same problem when installing mysql gem for Rails development. This fix worked for me http://seanbehan.com/programming/fixing-mysql-for-rails-2-2-development-on-mac-os-x/ The same thing works with the data objects gem. Just specify the path...

wget http://redis.googlecode.com/files/redis-0.900_2.tar.gz tar xzvf redis-0.900_2.tar.gz cd redis-0.900 make mv redis-server /usr/bin/ mv redis-cli /usr/bin/

Looks like there is a problem with using the attr_accessor method with datetime form fields http://dev.rubyonrails.org/ticket/8983 In Rails 2.3.2, for me at least, the problem seems to be popping up again. While trying to process a date for credit card v...