Examples of org.apache.hadoop.hbase.client.Get

org.apache.hadoop.hbase.client.Get
Used to perform Get operations on a single row.
To get everything for a row, instantiate a Get object with the row to get. To further define the scope of what to get, perform additional methods as outlined below.
To get all columns from specific families, execute {@link #addFamily(byte[]) addFamily}for each family to retrieve.
To get specific columns, execute {@link #addColumn(byte[],byte[]) addColumn}for each column to retrieve.
To only retrieve columns within a specific range of version timestamps, execute {@link #setTimeRange(long,long) setTimeRange}.
To only retrieve columns with a specific timestamp, execute {@link #setTimeStamp(long) setTimestamp}.
To limit the number of versions of each column to be returned, execute {@link #setMaxVersions(int) setMaxVersions}.
To add a filter, execute {@link #setFilter(Filter) setFilter}.

    long ts = 0;
    if (!tupleTimestampField.equals("")) {
      ts = tuple.getLongByField(tupleTimestampField);
    }


    Get g = new Get(rowKey);


    if (columnFamilies.size() > 0) {
      for (String cf : columnFamilies.keySet()) {
        byte[] cfBytes = Bytes.toBytes(cf);
        for (String cq : columnFamilies.get(cf)) {
          byte[] cqBytes = Bytes.toBytes(cq);
          g.addColumn(cfBytes, cqBytes);
          try {
            g.setMaxVersions(1);
          } catch (IOException e) {
            Log.error("Invalid number of versions", e);
          }
          if (ts > 0) {
            g.setTimeStamp(ts);
          }
        }
      }
    }

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    try {
      HTable table = new HTable(config, info.tableName);
      Field id = ClassInfo.getIdField(clazz);
      id.setAccessible(true);
      
      Get g = new Get(Bytes.toBytes(id.get(obj).toString()));      
      Result rowResult = table.get(g);
      if(rowResult.isEmpty()) throw new SienaException("No such object");
      mapObject(clazz, obj, rowResult);
    } catch(Exception e) {
      throw new SienaException(e);

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    }


    @Override
    public void execute(Tuple tuple) {
        byte[] rowKey = this.mapper.rowKey(tuple);
        Get get = hBaseClient.constructGetRequests(rowKey, projectionCriteria);


        try {
            Result result = hBaseClient.batchGet(Lists.newArrayList(get))[0];
            for(Values values : rowToTupleMapper.toValues(tuple, result)) {
                this.collector.emit(values);

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        HTableInterface hTable = getHTable();
        byte[] key = randomRowKey();
        Put put = new Put(key);
        put.add(cf, key, key);
        hTable.put(put);
        Result result = hTable.get(new Get(key));


        // Make sure the Put made it into the DB and the Get got it back
        Assert.assertNotNull(result);
        Assert.assertArrayEquals(key, result.getColumnLatest(cf, key).getValue());

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        byte[] row = randomRowKey();
        Put put = new Put(row);
        put.add(cf, row, row); // Just put anything, doesn't matter what
        hTable.put(put);
        
        Get get = new Get(row);
        Assert.assertTrue(hTable.exists(get));
        
        assertMetricsUpdated(OpType.EXISTS, OpType.PUT);
    }

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        byte[] row = randomRowKey();
        Put put = new Put(row);
        put.add(cf, row, row); // put whatever, just write something into the row 
        hTable.batch(ImmutableList.<Row>of(put));
        
        Get get = new Get(row);
        Assert.assertTrue(hTable.exists(get));
        
        assertMetricsUpdated(OpType.BATCH, OpType.EXISTS);
    }

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        Put put = new Put(row);
        put.add(cf, row, row); // put whatever, just write something into the row 
        hTable.batch(ImmutableList.<Row>of(put));
        
        Object[] results = new Result[1];
        Get get = new Get(row);
        hTable.batch(ImmutableList.<Row>of(get), results);
        
        Assert.assertArrayEquals(row, ((Result)(results[0])).getRow());
        assertMetricsUpdated(OpType.BATCH);
    }

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        Put put2 = new Put(row2);
        put2.add(cf, row2, row2);
        
        hTable.batch(ImmutableList.<Row>of(put1, put2));
        
        List<Get> gets = ImmutableList.<Get>of(new Get(row1), new Get(row2));
        Result[] results = hTable.get(gets);


        Assert.assertArrayEquals(row1, results[0].getRow());
        Assert.assertArrayEquals(row2, results[1].getRow());

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       Put newPut = new Put(row);
       byte[] randBytes = randomRowKey();
       newPut.add(cf, randBytes, randBytes);
       hTable.checkAndPut(row, cf, row, row, newPut);


       Result result = hTable.get(new Get(row));
       Assert.assertEquals(2, result.list().size());
       
       assertMetricsUpdated(OpType.PUT, OpType.CHECK_AND_PUT, OpType.GET);
   }

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       put.add(cf, row, row);
       hTable.put(put);


       hTable.delete(new Delete(row));
       
       Assert.assertTrue(hTable.get(new Get(row)).isEmpty());
       
       assertMetricsUpdated(OpType.PUT, OpType.GET, OpType.DELETE);
   }

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