MAPREDUCE服务 MRS-使用Get API读取HBase表数据:代码样例

时间:2024-06-29 14:11:26

代码样例

以下代码片段在com.huawei.bigdata.hbase.examples包的“HBaseSample”类的testGet方法中。

public void testGet() {
     LOG .info("Entering testGet.");
    // Specify the column family name.
    byte[] familyName = Bytes.toBytes("info");
    // Specify the column name.
    byte[][] qualifier = { Bytes.toBytes("name"), Bytes.toBytes("address") };
    // Specify RowKey.
    byte[] rowKey = Bytes.toBytes("012005000201");
    Table table = null;
    try {
      // Create the Table instance.
      table = conn.getTable(tableName);
      // Instantiate a Get object.
      Get get = new Get(rowKey);
      // Set the column family name and column name.
      get.addColumn(familyName, qualifier[0]);
      get.addColumn(familyName, qualifier[1]);
      // Submit a get request.
      Result result = table.get(get);
      // Print query results.
      for (Cell cell : result.rawCells()) {
        LOG.info("{}:{},{},{}", Bytes.toString(CellUtil.cloneRow(cell)),
                    Bytes.toString(CellUtil.cloneFamily(cell)), Bytes.toString(CellUtil.cloneQualifier(cell)),
                    Bytes.toString(CellUtil.cloneValue(cell)));
      }
      LOG.info("Get data successfully.");
    } catch (IOException e) {
      LOG.error("Get data failed " ,e);
    } finally {
      if (table != null) {
        try {
          // Close the HTable object.
          table.close();
        } catch (IOException e) {
          LOG.error("Close table failed " ,e);
        }
      }
    }
    LOG.info("Exiting testGet.");
  } 
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