cassandra，
cassandra 客户端命令操作流程：
具体流程：
首先，启动cassandra:
进入安装目录，使用命令：bin/cassandra
然后，连接到一个节点上：
$ ./cassandra-cli -host localhost -port 9160
Connected to: "Test Cluster" on localhost/9160
Welcome to cassandra CLI.
Type 'help;' or '?' for help. Type 'quit;' or 'exit;' to quit.
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之后创建一个key space和CF：
[default@unknown] create keyspace twissandra with replication_factor=1
and placement_strategy='org.apache.cassandra.locator.SimpleStrategy';
[default@unknown] use twissandra;
Authenticated to keyspace: twissandra
------------
... schemas agree across the cluster
[default@twissandra] create column family users with comparator = UTF8Type;
c21f48d5-8748-11e0-8afd-e700f669bcfc
Waiting for schema agreement...
... schemas agree across the cluster
[default@twissandra] set users['Bob']['phone']='1251892983';
Value inserted.
[default@twissandra] set users['Bob']['address']='Haidian,Beijing';
Value inserted.
[default@twissandra] set users['Bob']['birthday']='1980-08-09';
Value inserted.
[default@twissandra] get users['Bob'];
=> (column=address, value=4861696469616e2c4265696a696e67, timestamp=1306380804182000)
=> (column=birthday, value=313938302d30382d3039, timestamp=1306380831152000)
=> (column=phone, value=31323531383932393833, timestamp=1306380777399000)
Returned 3 results.
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更新phone column的值：
[default@twissandra] set users['Bob']['phone']='1251892999';
Value inserted.
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删除phone column：
[default@twissandra] del users['Bob']['phone'];
column removed.
[default@twissandra] list users;
Using default limit of 100
-------------------
RowKey: Bob
=> (column=adress, value=4861696469616e2c4265696a696e67, timestamp=1306380804182000)
=> (column=birthday, value=313938302d30382d3039, timestamp=1306380831152000)
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删除users CF：
[default@twissandra] drop column family users;
f1d9d7a6-874a-11e0-8afd-e700f669bcfc
Waiting for schema agreement...
... schemas agree across the cluster
------
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创建SCF：
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[default@twissandra] create column family friends with column_type=Super;
73264792-8740-11e0-8afd-e700f669bcfc
Waiting for schema agreement...
... schemas agree across the cluster
[default@twissandra] set friends['Bob']['address']['family']='BeiJing';
Value inserted.
[default@twissandra] set friends['Bob']['address']['company']='BeiJing';
Value inserted.
[default@twissandra] get friends['Bob']['address'];
=> (column=636f6d70616e79, value=4265694a696e67, timestamp=1306380530572000)
=> (column=66616d696c79, value=4265694a696e67, timestamp=1306380522162000)
Returned 2 results.
[default@twissandra] get friends['Bob'];
=> (super_column=61646472657373,
(column=636f6d70616e79, value=4265694a696e67, timestamp=1306380530572000)
(column=66616d696c79, value=4265694a696e67, timestamp=1306380522162000))
Returned 1 results。
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