text 在Cassandra DB中存储邮件元数据。

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CREATE KEYSPACE mail 
  WITH replication = {
  	'class': 'SimpleStrategy', 
  	'replication_factor': 1
  };

CREATE TABLE mailbox ( 
	box_id text, year int, 
	received timestamp, 
	folder text,
	sender text, 
	receipients list<text>,
	subject text,
	body text,
PRIMARY KEY ((box_id, year), received);

INSERT INTO mailbox (box_id, year, folder, received, sender, receipients, body) 
VALUES ('torchwood', 2018, 'Inbox', dateof(now()), 'kk@example.com', ['dr.who@torchwood.org'], 'Sample text');

INSERT INTO mailbox (box_id, year, folder, received, sender, receipients, body) 
VALUES ('torchwood', 2018, 'Inbox', dateof(now()), 'ab@c.de', ['dr.who@torchwood.org'], 'Sample text');

INSERT INTO mailbox (box_id, year, folder, received, sender, receipients, body) 
VALUES ('torchwood', 2018, 'Inbox', dateof(now()), 'pi@schneierfacts.com', ['dr.who@torchwood.org'], 'Sample text');

INSERT INTO mailbox (box_id, year, folder, received, sender, receipients, body) 
VALUES ('torchwood', 2018, 'Inbox', dateof(now()), 'root@kroes.ch', ['dr.who@torchwood.org'], 'Sample text');

SELECT * from mailbox WHERE box_id = 'torchwood' and year = 2018 and folder='Inbox' ORDER BY folder DESC;

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