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『DataStax DevCenter』というCassandraのCQLツール(GUIツール)のご紹介

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『DataStax DevCenter』というCassandraのCQLツール(GUIツール)をご紹介します。

※Oracle でいうところの「SQL Developer」などにあたるツールです。

DevCenter.png


①DataStax Academyのアカウントを作成する。

Create new account | DataStax Academy: Free Cassandra Tutorials and Training

https://academy.datastax.com/user/register?destination=home


②『DataStax DevCenter』をダウンロードする。

https://academy.datastax.com/downloads?destination=downloads/ops-center&dxt=DX#devcenter

DevCenter._DLpng.png


③system keyspace で、システム日付とTimeUUIDを取得してみる。

Query

SELECT dateof(now()) as sysdate, now() as timeuuid FROM system.local;

Result

sysdate
timeuuid

2018-02-16 07:30:30+0000
44529f03-12eb-11e8-9fb5-fddf3f702750


以下は、CQLコマンドのサンプルです。


keyspaceの作成

Query

CREATE KEYSPACE [keyspace_name] WITH replication = { 'class' : 'SimpleStrategy', 'replication_factor' : 1 };


keyspaceの確認(cqlsh> で実行)

Query

DESCRIBE KEYSPACE [keyspace_name];

DESC KEYSPACE [keyspace_name];

Result

CREATE KEYSPACE keyspace_name WITH replication = {'class': 'SimpleStrategy', 'replication_factor': '1'}  AND durable_writes = true;


keyspaceの削除

Query

DROP KEYSPACE [keyspace_name];


Tableの作成

Query

CREATE TABLE keyspace_name.table_name (

column_id uuid,
column_str text,
column_int int,
column_data text,
PRIMARY KEY (column_id, column_str, column_int)
);


Tableの確認(cqlsh> で実行)

Query

DESCRIBE KEYSPACE [keyspace_name];

DESC KEYSPACE [keyspace_name];

Result

CREATE KEYSPACE keyspace_name WITH replication = {'class': 'SimpleStrategy', 'replication_factor': '1'}  AND durable_writes = true;

CREATE TABLE keyspace_name.table_name (
column_id uuid,
column_str text,
column_int int,
column_data text,
PRIMARY KEY (column_id, column_str, column_int)
) WITH CLUSTERING ORDER BY (column_str ASC, column_int ASC)
AND bloom_filter_fp_chance = 0.01
AND caching = '{"keys":"ALL", "rows_per_partition":"NONE"}'
AND comment = ''
AND compaction = {'class': 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy'}
AND compression = {'sstable_compression': 'org.apache.cassandra.io.compress.LZ4Compressor'}
AND dclocal_read_repair_chance = 0.1
AND default_time_to_live = 0
AND gc_grace_seconds = 864000
AND max_index_interval = 2048
AND memtable_flush_period_in_ms = 0
AND min_index_interval = 128
AND read_repair_chance = 0.0
AND speculative_retry = '99.0PERCENTILE';


Tableの削除

Query

DROP TABLE keyspace_name.table_name;


INSERT

Query

INSERT INTO keyspace_name.table_name (column_id, column_str, column_int, column_data) 

VALUES (44529f03-12eb-11e8-9fb5-fddf3f702750, 'String', 1, 'Data');


SELECT

Query

SELECT * FROM keyspace_name.table_name WHERE column_id = 44529f03-12eb-11e8-9fb5-fddf3f702750;

Result

column_id
column_str
column_int
column_data

44529f03-12eb-11e8-9fb5-fddf3f702750
String
1
Data


同一KEYのINSERT(UPDATEされる)

Query

INSERT INTO keyspace_name.table_name (column_id, column_str, column_int, column_data) 

VALUES (44529f03-12eb-11e8-9fb5-fddf3f702750, 'String', 1, 'INSERT(UPDATE)');

Result

column_id
column_str
column_int
column_data

44529f03-12eb-11e8-9fb5-fddf3f702750
String
1
INSERT(UPDATE)


UPDATE

Query

UPDATE keyspace_name.table_name SET column_data = 'UPDATE' 

WHERE column_id = 44529f03-12eb-11e8-9fb5-fddf3f702750 AND column_str = 'String' AND column_int = 1;

Result

column_id
column_str
column_int
column_data

44529f03-12eb-11e8-9fb5-fddf3f702750
String
1
UPDATE


DELETE

Query

DELETE FROM keyspace_name.table_name 

WHERE column_id = 44529f03-12eb-11e8-9fb5-fddf3f702750 AND column_str = 'String' AND column_int = 1;


TRUNCATE

Query

TRUNCATE keyspace_name.table_name;


参考リンク


おわりに

Qiitaの [cql][cqlsh] のタグにアイコンが無かったので、Qiitaのアイコンをまねしてデザインしてみた!

なかなか良い出来だ!と思ったら「いいね!」をお願いします!

CQL.png