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}.

    Delete delete = new Delete(row);
    delete.deleteColumns(fam, splitA);
    region.delete(delete, null, true);


    // assert some things:
    Get get = new Get(row).addColumn(fam, serverinfo);
    Result result = region.get(get, null);
    assertEquals(1, result.size());


    get = new Get(row).addColumn(fam, splitA);
    result = region.get(get, null);
    assertEquals(0, result.size());


    get = new Get(row).addColumn(fam, splitB);
    result = region.get(get, null);
    assertEquals(1, result.size());
  }

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    // now delete something in the present
    Delete delete = new Delete(row);
    region.delete(delete, null, true);


    // make sure we still see our data
    Get get = new Get(row).addColumn(fam, serverinfo);
    Result result = region.get(get, null);
    assertEquals(1, result.size());
    
    // delete the future row
    delete = new Delete(row,HConstants.LATEST_TIMESTAMP-3,null);
    region.delete(delete, null, true);


    // make sure it is gone
    get = new Get(row).addColumn(fam, serverinfo);
    result = region.get(get, null);
    assertEquals(0, result.size());
  }

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    put = new Put(row);
    put.add(fam1, qual1, value2);
    region.put(put);


    // ok get:
    Get get = new Get(row);
    get.addColumn(fam1, qual1);


    Result r = region.get(get, null);
    assertEquals(1, r.size());
    assertByteEquals(value2, r.getValue(fam1, qual1));

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    //Setting up region
    String method = this.getName();
    initHRegion(tableName, method, fam1);
    
    Get get = new Get(row1);
    get.addColumn(fam2, col1);
    
    //Test
    try {
      region.get(get, null);
    } catch (NoSuchColumnFamilyException e){

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    put.add(fam1, col3, null);
    put.add(fam1, col4, null);
    put.add(fam1, col5, null);
    region.put(put);


    Get get = new Get(row1);
    get.addColumn(fam1, col2);
    get.addColumn(fam1, col4);
    //Expected result
    KeyValue kv1 = new KeyValue(row1, fam1, col2);
    KeyValue kv2 = new KeyValue(row1, fam1, col4);
    KeyValue [] expected = {kv1, kv2};


    //Test
    Result res = region.get(get, null);
    assertEquals(expected.length, res.size());
    for(int i=0; i<res.size(); i++){
      assertEquals(0,
          Bytes.compareTo(expected[i].getRow(), res.raw()[i].getRow()));
      assertEquals(0,
          Bytes.compareTo(expected[i].getFamily(), res.raw()[i].getFamily()));
      assertEquals(0,
          Bytes.compareTo(
              expected[i].getQualifier(), res.raw()[i].getQualifier()));
    }


    // Test using a filter on a Get
    Get g = new Get(row1);
    final int count = 2;
    g.setFilter(new ColumnCountGetFilter(count));
    res = region.get(g, null);
    assertEquals(count, res.size());
  }

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    byte [] fam = Bytes.toBytes("fam");
    
    String method = this.getName();
    initHRegion(tableName, method, fam);
    
    Get get = new Get(row);
    get.addFamily(fam);
    Result r = region.get(get, null);
    
    assertTrue(r.isEmpty());
  }

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    //Add to memstore
    Put put = new Put(HConstants.EMPTY_START_ROW);
    put.add(HConstants.CATALOG_FAMILY, HConstants.REGIONINFO_QUALIFIER, null);
    region.put(put);
    
    Get get = new Get(HConstants.EMPTY_START_ROW);
    get.addColumn(HConstants.CATALOG_FAMILY, HConstants.REGIONINFO_QUALIFIER);


    //Expected result
    KeyValue kv1 = new KeyValue(HConstants.EMPTY_START_ROW,
        HConstants.CATALOG_FAMILY, HConstants.REGIONINFO_QUALIFIER);
    KeyValue [] expected = {kv1};

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    region.put(put);


    long result = region.incrementColumnValue(row, fam1, qual3, amount, true);
    assertEquals(amount, result);


    Get get = new Get(row);
    get.addColumn(fam1, qual3);
    Result rr = region.get(get, null);
    assertEquals(1, rr.size());


    // ensure none of the other cols were incremented.
    assertICV(row, fam1, qual1, value);

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  private void assertICV(byte [] row,
                         byte [] familiy,
                         byte[] qualifier,
                         long amount) throws IOException {
    // run a get and see?
    Get get = new Get(row);
    get.addColumn(familiy, qualifier);
    Result result = region.get(get, null);
    assertEquals(1, result.size());


    KeyValue kv = result.raw()[0];
    long r = Bytes.toLong(kv.getValue());

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    PutThread putThread = new PutThread(numRows, families, qualifiers);
    putThread.start();
    FlushThread flushThread = new FlushThread();
    flushThread.start();


    Get get = new Get(Bytes.toBytes("row0"));
    Result result = null;


    int expectedCount = numFamilies * numQualifiers;


    long prevTimestamp = 0L;

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