To get started let’s have a quick look on how Crate Data can be used. This tutorial uses the crash command-line SQL shell shipped with Crate.
First lets connect to a running node:
cr> connect 127.0.0.1:4200
+------------------------+-----------+-----------+---------+
| server_url | node_name | connected | message |
+------------------------+-----------+-----------+---------+
| http://127.0.0.1:... | crate | TRUE | OK |
+------------------------+-----------+-----------+---------+
CONNECT OK
In this guide we want to create a database for Twitter tweets. Let’s create the table tweets with all columns we need. In order to keep this tutorial simple, we’ll just inserting the user_id instead of a complete user object:
cr> create table tweets (
... created_at timestamp,
... id string primary key,
... retweeted boolean,
... source string INDEX using fulltext,
... text string INDEX using fulltext,
... user_id string
... )
CREATE OK (... sec)
Now we are ready for inserting our first tweet:
cr> insert into tweets values(1394182937, '1', true, 'web', 'Don''t panic', 'Douglas')
INSERT OK, 1 row affected (... sec)
And another:
cr> insert into tweets values(1394182938, '2', true, 'web', 'Time is an illusion. Lunchtime doubly so', 'Ford')
INSERT OK, 1 row affected (... sec)
Looking up only Ford’s tweets:
cr> select * from tweets where id = '2'
+------------+----+-----------+--------+------------------------------------------+---------+
| created_at | id | retweeted | source | text | user_id |
+------------+----+-----------+--------+------------------------------------------+---------+
| 1394182938 | 2 | TRUE | web | Time is an illusion. Lunchtime doubly so | Ford |
+------------+----+-----------+--------+------------------------------------------+---------+
SELECT 1 row in set (... sec)