Cassandra Java 使用TimeUUIDType

参考地址 http://wiki.apache.org/cassandra/FAQ#working_with_timeuuid_in_java

下载一个包 http://johannburkard.de/software/uuid/

 

代码示例：

代码

import java.util.List;

import org.apache.thrift.transport.TTransport;
import org.apache.thrift.transport.TSocket;
import org.apache.thrift.protocol.TProtocol;
import org.apache.thrift.protocol.TBinaryProtocol;
import org.apache.thrift.TException;
import org.apache.cassandra.thrift.Cassandra;
import org.apache.cassandra.thrift.Column;
import org.apache.cassandra.thrift.ColumnOrSuperColumn;
import org.apache.cassandra.thrift.ColumnParent;
import org.apache.cassandra.thrift.ColumnPath;
import org.apache.cassandra.thrift.ConsistencyLevel;
import org.apache.cassandra.thrift.InvalidRequestException;
import org.apache.cassandra.thrift.SlicePredicate;
import org.apache.cassandra.thrift.SliceRange;
import org.apache.cassandra.thrift.TimedOutException;
import org.apache.cassandra.thrift.UnavailableException;

public   class  test {
     public   static   void  main(String[] args) throws Exception, InvalidRequestException, UnavailableException, TimedOutException, TException {        
         byte [] uuid  =  asByteArray(getTimeUUID());
        TTransport tr  =   new  TSocket( " localhost " ,  9160 );
        TProtocol proto  =   new  TBinaryProtocol(tr);
        Cassandra.Client client  =   new  Cassandra.Client(proto);
        tr.open();
        String key_user_id  =   " 123 " ;
         long  timestamp  =  System.currentTimeMillis();
        ColumnPath cp  = new  ColumnPath();
        cp.setColumn(uuid);
        cp.setColumn_family( " StandardByUUID1 " );
        client.insert( " Keyspace1 " ,
                      key_user_id,
                      cp,
                       " Some thing here " .getBytes( " UTF-8 " ),
                      timestamp,
                      ConsistencyLevel.ONE);
        
        SliceRange sr  =   new  SliceRange( new   byte [ 0 ],  new   byte [ 0 ],  false ,  10 );
        SlicePredicate predicate  =   new  SlicePredicate();
        predicate.setSlice_range(sr);
        ColumnParent parent  =   new  ColumnParent();
        parent.setColumn_family( " StandardByUUID1 " );        
        List < ColumnOrSuperColumn >  results  =  client.get_slice( " Keyspace1 " , key_user_id, parent, predicate, ConsistencyLevel.ONE);
         for  (ColumnOrSuperColumn result : results)
        {
            Column column  =  result.column;
            System. out .println(toUUID(column.name).toString()  +   "  ->  "   +   new  String(column.value,  " UTF-8 " ));
        }

        tr.close();
        System. out .println( " done. " );
    }
     public   static  java.util.UUID getTimeUUID()
    {
         return  java.util.UUID.fromString( new  com.eaio.uuid.UUID().toString());
    }
    
     public   static   byte [] asByteArray(java.util.UUID uuid)
    {
         long  msb  =  uuid.getMostSignificantBits();
         long  lsb  =  uuid.getLeastSignificantBits();
         byte [] buffer  =   new   byte [ 16 ];

         for  ( int  i  =   0 ; i  <   8 ; i ++ ) {
                buffer[i]  =  ( byte ) (msb  >>>   8   *  ( 7   -  i));
        }
         for  ( int  i  =   8 ; i  <   16 ; i ++ ) {
                buffer[i]  =  ( byte ) (lsb  >>>   8   *  ( 7   -  i));
        }

         return  buffer;
    }

     public   static  java.util.UUID toUUID(  byte [] uuid )
    {
         long  msb  =   0 ;
         long  lsb  =   0 ;
        assert uuid.length  ==   16 ;
         for  ( int  i = 0 ; i < 8 ; i ++ )
            msb  =  (msb  <<   8 )  |  (uuid[i]  &   0xff );
         for  ( int  i = 8 ; i < 16 ; i ++ )
            lsb  =  (lsb  <<   8 )  |  (uuid[i]  &   0xff );
         long  mostSigBits  =  msb;
         long  leastSigBits  =  lsb;
    
        com.eaio.uuid.UUID u  =   new  com.eaio.uuid.UUID(msb,lsb);
         return  java.util.UUID.fromString(u.toString());
    }
}

 

 

 使用cassandra-cli查询结果：

 

输出结果：

9a3212f0-7584-11df-9632-001fe210d7db -> Chris Goffinet

fa6685c0-7584-11df-8856-001fe210d7db -> Some thing here 

done. 

转载于:https://www.cnblogs.com/mobile/archive/2010/06/11/1756216.html