Examples of KijiRowData

org.kiji.schema.KijiRowData
the value stored in the column named 'info:name' with a timestamp of 42. final String name = row.getValue("info", "name", 42L);
We also provide additional methods for accessing data stored withing a row. See the documentation below for methods with the name 'get*' for more information.

Checking for existence of cells

Since rows within a Kiji table may not contain all the columns defined within a layout we need a way to check this in code. KijiRowData contains several methods to help with this:
```
  final KijiRowData row = myTableReader.get(myEntityId, myDataRequest); if (row.containsColumn("info", "name")) { // Now that we know the cell exists, read the value. final String name = row.getMostRecentValue("info", "name"); } if (row.containsCell("info", "name", 42L)) { // Now that we know that this cell exists at the timestamp of 42. final String name = row.getValue("info", "name", 42L); }  
```
Dealing with large rows

Rows in Kiji tables may contain large amounts of data. In some cases, this is caused by storing many versions of a cell with different timestamps in a row. This can become a problem when the size of a row/cell exceeds the amount of RAM available. To deal with large rows, you may use paging through a {@link KijiPager}. When paging is enabled on a column, cells from that column may only be accessed through {@link #getPager(String)} and {@link #getPager(String,String)}. See the documentation for {@link KijiPager} for more information.

Examples of org.kiji.schema.KijiRowData

    final KijiDataRequest dataRequest = KijiDataRequest.builder()
        .addColumns(ColumnsDef.create().withMaxVersions(2).add("family", "column"))
        .build();


    // Try this as a get.
    KijiRowData rowData = mReader.get(mEntityId, dataRequest);
    String s = rowData.getValue("family", "column", 0L).toString();
    assertEquals(s, "Value at timestamp 0.");


    // Delete the cell and make sure that this value is missing.
    mWriter.deleteCell(mEntityId, "family", "column", 0L);


    rowData = mReader.get(mEntityId, dataRequest);
    assertFalse(rowData.containsCell("family", "column", 0L));
  }

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Examples of org.kiji.schema.KijiRowData

    final KijiDataRequest dataRequest = KijiDataRequest.builder()
        .addColumns(ColumnsDef.create().withMaxVersions(100).add("family", "column"))
        .build();


    // Do a get and verify the value (only one value should be present now).
    KijiRowData rowData = mReader.get(mEntityId, dataRequest);
    String s = rowData.getValue("family", "column", 0L).toString();
    assertEquals(s, "Value at timestamp 0.");


    // Write a second value, with a more-recent timestamp.
    mWriter.put(mEntityId, "family", "column", 1L, "Value at timestamp 1.");


    // Do a get and verify that both values are present.
    rowData = mReader.get(mEntityId, dataRequest);
    assertTrue(rowData.containsCell("family", "column", 0L));
    assertTrue(rowData.containsCell("family", "column", 1L));


    // The most-recent value should be the one with the highest timestamp!
    assertEquals(
        "Value at timestamp 1.", rowData.getMostRecentValue("family", "column").toString());
  }

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Examples of org.kiji.schema.KijiRowData

    final KijiDataRequest dataRequest = KijiDataRequest.builder()
        .addColumns(ColumnsDef.create().withMaxVersions(100).add("family", "column"))
        .build();


    // Try this as a get.
    KijiRowData rowData = mReader.get(mEntityId, dataRequest);
    assertNotNull(rowData.getMostRecentValue("family", "column"));
    assertEquals(
      rowData.getMostRecentValue("family", "column").toString(),
      "First value");


    mWriter.put(mEntityId, "family", "column", "Second value");
    rowData = mReader.get(mEntityId, dataRequest);


    assertNotNull(rowData.getMostRecentValue("family", "column"));
    assertEquals(
        rowData.getMostRecentValue("family", "column").toString(),
        "Second value");
  }

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Examples of org.kiji.schema.KijiRowData

    final KijiDataRequest dataRequest = KijiDataRequest.builder()
        .addColumns(ColumnsDef.create().withMaxVersions(100).add("family", "column"))
        .build();


    // Try this as a get.
    KijiRowData rowData = mReader.get(mEntityId, dataRequest);
    String s = rowData.getValue("family", "column", 0L).toString();
    assertEquals(s, "Value at timestamp 0.");


    // Delete the entire column.
    mWriter.deleteColumn(mEntityId, "family", "column");


    rowData = mReader.get(mEntityId, dataRequest);


    // Should not get any data back!
    assertFalse(rowData.containsColumn("family", "column"));
  }

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Examples of org.kiji.schema.KijiRowData

  public void testReadMissingValue() throws Exception {
    final KijiDataRequest dataRequest = KijiDataRequest.builder()
        .addColumns(ColumnsDef.create().withMaxVersions(100).add("family", "column"))
        .build();


    KijiRowData rowData = mReader.get(mEntityId, dataRequest);
    assertNull(rowData.getValue("family", "column", 0L));
  }

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Examples of org.kiji.schema.KijiRowData

    final KijiDataRequest dataRequest = KijiDataRequest.builder()
        .addColumns(ColumnsDef.create().withMaxVersions(100).add("family", "column"))
        .build();


    // Try this as a get.
    KijiRowData rowData = mReader.get(mEntityId, dataRequest);
    String s = rowData.getValue("family", "column", 0L).toString();
    assertEquals(s, "Value at timestamp 0.");


    // Delete the entire family.
    mWriter.deleteFamily(mEntityId, "family");


    rowData = mReader.get(mEntityId, dataRequest);


    // Should not get any data back!
    assertFalse(rowData.containsColumn("family", "column"));
  }

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Examples of org.kiji.schema.KijiRowData

    final KijiDataRequest dataRequest = KijiDataRequest.builder()
        .addColumns(ColumnsDef.create().withMaxVersions(100).add("family", "column"))
        .build();


    // Try this as a get.
    KijiRowData rowData = mReader.get(mEntityId, dataRequest);
    String s = rowData.getValue("family", "column", 0L).toString();
    assertEquals(s, "Value at timestamp 0.");


    // Delete the entire row.
    mWriter.deleteRow(mEntityId);


    rowData = mReader.get(mEntityId, dataRequest);


    // Should not get any data back!
    assertFalse(rowData.containsColumn("family", "column"));
  }

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Examples of org.kiji.schema.KijiRowData

    List<KijiRowData> dataList = mReader.bulkGet(entityIds, request);


    assertEquals(numRows, dataList.size());


    for (int rowNum = 0; rowNum < numRows; rowNum++) {
      KijiRowData data = dataList.get(rowNum);
      EntityId eid = mTable.getEntityId("row#" + rowNum);
      assertEquals(eid, data.getEntityId());
      assertEquals(
          "This is row " + rowNum + ".",
          data.getMostRecentValue("family", "column").toString()
      );
    }
  }

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Examples of org.kiji.schema.KijiRowData

    //mWriter.put(mEntityId, "family", "column", "latest");


    final KijiDataRequest dataRequest = KijiDataRequest.create("family", "column");


    // Sanity check that the write succeeded.
    KijiRowData rowData = mReader.get(mEntityId, dataRequest);
    KijiCell cell = rowData.getMostRecentCell("family", "column");
    assertNotNull(cell);
    assertEquals(cell.getData().toString(), "latest");


    // Let's just check that the timestamp is within 5 minutes of the system time.
    Long storedTimestamp = cell.getTimestamp();

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Examples of org.kiji.schema.KijiRowData

      KijiTableReader tableReader = table.openTableReader();
      // Surround with a try/finally so the tablereader gets closed.
      try {
        // Build a DataRequest for the row we want.
        KijiDataRequest dataRequest = KijiDataRequest.create("info", "name");
        KijiRowData result = tableReader.get(entityId, dataRequest);
        String name = result.getMostRecentValue("info", "name").toString();
        System.out.println("Read username " + name + " from table.");
      } finally {
        tableReader.close();
      }
    } finally {

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Examples of KijiRowData

Checking for existence of cells

Dealing with large rows

Examples of org.kiji.schema.KijiRowData

Examples of org.kiji.schema.KijiRowData

Examples of org.kiji.schema.KijiRowData

Examples of org.kiji.schema.KijiRowData

Examples of org.kiji.schema.KijiRowData

Examples of org.kiji.schema.KijiRowData

Examples of org.kiji.schema.KijiRowData

Examples of org.kiji.schema.KijiRowData

Examples of org.kiji.schema.KijiRowData

Examples of org.kiji.schema.KijiRowData