Cassandra入门

关于NoSql数据存储方式的优劣这里不再讨论，可以关注
http://www.iteye.com/topic/524977

这里简要介绍一下Cassandra入门，即安装和简单实用。

下载cassandra，http://cassandra.apache.org/download/
解压到 D:\apache-cassandra-0.5.1

创建环境变量 CASSANDRA_HOME = D:\apache-cassandra-0.5.1

设置conf/storage-conf.xml中的目录路径

<CommitLogDirectory>D:/cassandra/commitlog</CommitLogDirectory>
  <DataFileDirectories>
      <DataFileDirectory>D:/cassandra/data</DataFileDirectory>
  </DataFileDirectories>
  <CalloutLocation>D:/cassandra/callouts</CalloutLocation>
  <StagingFileDirectory>D:/cassandra/staging</StagingFileDirectory>

运行 D:\apache-cassandra-0.5.1\bin>cassandra -f

启动后如下所示：



这里服务端便启动完毕，现在开启另一个cmd,在bin目录下运行cassandra-cli，即cassandra客户端。进入客户端后，键入connect localhost/9160 链接服务器。链接后如图：


以下读写cassandra数据

cassandra> set Keyspace1.Standard1['jsmith']['first'] = 'John'
  Value inserted.
  cassandra> set Keyspace1.Standard1['jsmith']['last'] = 'Smith'
  Value inserted.
  cassandra> set Keyspace1.Standard1['jsmith']['age'] = '42'
  Value inserted.
  cassandra> get Keyspace1.Standard1['jsmith']
    (column=age, value=42; timestamp=1249930062801)
    (column=first, value=John; timestamp=1249930053103)
    (column=last, value=Smith; timestamp=1249930058345)
  Returned 3 rows.
  cassandra>

  
set Keyspace1.Standard1['jsmith']['first'] = 'John'
       \            \         \        \          \
        \            \         \_ key   \          \_ value
         \            \                  \_ column
          \_ keyspace  \_ column family

Data stored in Cassandra is associated with a column family (Standard1),
which in turn is associated with a keyspace (Keyspace1). In the example
above, we set the value 'John' in the 'first' column for key 'jsmith'.