절약을 사용하여 Cassandra에 SuperColumn을 삽입하십시오.

Question

저주와 Java를 사용하여 수퍼 컬럼에 수퍼 컬럼을 삽입하는 방법을 명확한 예제가 필요합니다.

Answer 1

@Override 
public void insertAllReportsByHost(Map<String, List<IReport>> hostReports) throws DatabaseException { 
    try { 
     Cassandra.Client client = getClient(); 

     Map<ByteBuffer, Map<String, List<Mutation>>> mutationsMap = new HashMap<ByteBuffer, Map<String, List<Mutation>>>(); 

     for (Map.Entry<String, List<IReport>> entryReport : hostReports.entrySet()) { 

      ByteBuffer host = toByteBuffer(entryReport.getKey()); 
      List<IReport> reports = entryReport.getValue(); 
      Map<String, List<Mutation>> keyMutations = new HashMap<String, List<Mutation>>(); 
      List<Mutation> mutations = new ArrayList<Mutation>(); 

      for (IReport report : reports) { 
       report.getProperties(); 
       Column reportDataColumn = new Column(toByteBuffer("Report Data")); 
       reportDataColumn.setValue(toByteBuffer(report.toString()));//TODO make another way 
       reportDataColumn.setTimestamp(System.currentTimeMillis()); 

       Long nano = System.nanoTime(); 
       SuperColumn superColumn = new SuperColumn(toByteBuffer(report.getReportId().toString()), Arrays.asList(reportDataColumn)); 
       ColumnOrSuperColumn col = new ColumnOrSuperColumn(); 
       col.super_column = superColumn; 

       Mutation m = new Mutation(); 
       m.setColumn_or_supercolumn(col); 

       mutations.add(m); 
      } 


      keyMutations.put(COLUMN_FAMILY, mutations); 

      mutationsMap.put(host, keyMutations); 
     } 

     client.batch_mutate(mutationsMap, ConsistencyLevel.ONE); 

    } catch (UnsupportedEncodingException e) { 
     LOGGER.error(e.getMessage(), e); 
     throw new DatabaseException(e); 
    } catch (UnavailableException e) { 
     LOGGER.error(e.getMessage(), e); 
     throw new DatabaseException(e); 
    } catch (TException e) { 
     LOGGER.error(e.getMessage(), e); 
     throw new DatabaseException(e); 
    } catch (InvalidRequestException e) { 
     LOGGER.error(e.getMessage(), e); 
     throw new DatabaseException(e); 
    } catch (TimedOutException e) { 
     LOGGER.error(e.getMessage(), e); 
     throw new DatabaseException(e); 
    } 
}