Cassandra数据存储
版本：0.7.6
客户端：cassandra自带的thrift客户端
标准column的查询、删除、新增：
TProtocolproto=newTBinaryProtocol(tr);
Cassandra.Clientclient=newCassandra.Client(proto);
tr.open();
client.set_keyspace("Keyspace1");
ColumnPathpath=newColumnPath();
longtimestamp=System.currentTimeMillis();
//插入数据
Columncolumn=newColumn();
column.setName("age".getBytes());
column.setValue("19".getBytes());
column.setTimestamp(timestamp);
client.insert(ByteBuffer.wrap("user".getBytes()),newColumnParent("standard1"),column,ConsistencyLevel.ONE);
//读取数据
path=newColumnPath();
path.setColumn_family("standard1");
path.setColumn("age".getBytes("UTF-8"));
ColumnOrSuperColumncc=client.get(ByteBuffer.wrap("user".getBytes()),path,ConsistencyLevel.ONE);
Columnc=cc.getColumn();
Stringv=newString(c.getValue(),"UTF-8");
System.out.println("Value--------"+v);
//删除数据
//path=newColumnPath();
//path.setColumn_family("standard1");
//path.setColumn("age".getBytes("UTF-8"));
//client.remove(ByteBuffer.wrap("user".getBytes()),path,timestamp,ConsistencyLevel.ONE);
//关闭数据库连接
tr.close();SuperColumn新增和查询：
/**
* 插入SuperColumn
*
* @throws Exception
*/
public void insertSuperColumn() throws Exception {
TTransport tr = new TFramedTransport(new TSocket("localhost",9160));
TProtocol proto = new TBinaryProtocol(tr);
Cassandra.Client client = new Cassandra.Client(proto);
tr.open();
client.set_keyspace("Keyspace1");
ColumnParent cp1 = new ColumnParent();
cp1.setColumn_family("Super2");
cp1.setSuper_column("address".getBytes());
Column city = new Column();
city.setName("province".getBytes());
city.setValue("guangdong".getBytes());
city.setTimestamp(time);
client.insert(ByteBuffer.wrap("user2".getBytes()), cp1, city, ConsistencyLevel.ONE);
}
/**
* 读取SuperColumn
*
* @throws Exception
*/
public void getSuper() throws Exception {
TTransport tr = new TFramedTransport(new TSocket("localhost",9160));
TProtocol proto = new TBinaryProtocol(tr);
Cassandra.Client client = new Cassandra.Client(proto);
tr.open();
client.set_keyspace("Keyspace1");
ColumnPath path = new ColumnPath("Super2");
path.setSuper_column("address".getBytes());
path.setColumn("province".getBytes());
ColumnOrSuperColumn s = client.get(ByteBuffer.wrap("user5".getBytes()), path, ConsistencyLevel.ONE);
System.out.println(new String(s.column.getValue(), "utf8"));
}困惑：如果superColumn下的Column是一个SuperColumn怎么插入数据？没有找到相关的api。