MapReduce服务 MRS-使用Get读取数据:代码样例

时间:2023-11-01 16:19:45

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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