October 2014
Beginner to intermediate
150 pages
2h 32m
English
Content preview from Études for ElixirBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 11. Storing Structured Data
Étude 11-1: Using ETS
This étude will set up a small database that keeps track of phone calls.
Part One
Start by creating a record that defines these fields:
- Phone number
- Starting date (month, day, and year)
- Starting time (hours, minutes, and seconds)
- End date (month, day, and year)
- End time (hours, minutes, and seconds)
You may name the record whatever you wish, and you may use any
field names you wish. For the default values for dates and times,
use the strings "1900-01-01" and "00:00:00".
In a module named PhoneETS, read a data file of phone call summaries
and create an ETS table for the calls. The function
that does this will be named setup/1, and its argument will be the
name of the file containing the data.
Copy the following text into a file named
call_data.csv and save the file in the same directory where you
are going to write your module.
650-555-3326,2013-03-10,09:01:47,2013-03-10,09:05:11 415-555-7871,2013-03-10,09:02:20,2013-03-10,09:05:09 729-555-8855,2013-03-10,09:00:55,2013-03-10,09:02:18 729-555-8855,2013-03-10,09:02:57,2013-03-10,09:03:56 213-555-0172,2013-03-10,09:00:59,2013-03-10,09:03:49 946-555-9760,2013-03-10,09:01:20,2013-03-10,09:03:10 301-555-0433,2013-03-10,09:01:44,2013-03-10,09:04:06 301-555-0433,2013-03-10,09:05:17,2013-03-10,09:07:53 301-555-0433,2013-03-10,09:10:05,2013-03-10,09:13:14 729-555-8855,2013-03-10,09:04:40,2013-03-10,09:07:29 213-555-0172,2013-03-10,09:04:26,2013-03-10,09:06:00 213-555-0172,2013-03-10,09:06:59,2013-03-10,09:10:35 ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.