package client;
// cc GetExample Example application retrieving data from HBase
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.client.Get;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.util.Bytes;
import util.HBaseHelper;
import java.io.IOException;
public class CRUDExample {
public static void main(String[] args) throws IOException {
// vv GetExample
Configuration conf = HBaseConfiguration.create(); // co GetExample-1-CreateConf Create the configuration.
// ^^ GetExample
HBaseHelper helper = HBaseHelper.getHelper(conf);
if (!helper.existsTable("testtable")) {
helper.createTable("testtable", "colfam1");
}
// vv GetExample
HTable table = new HTable(conf, "testtable"); // co GetExample-2-NewTable Instantiate a new table reference.
Get get = new Get(Bytes.toBytes("row1")); // co GetExample-3-NewGet Create get with specific row.
get.addColumn(Bytes.toBytes("colfam1"), Bytes.toBytes("qual1")); // co GetExample-4-AddCol Add a column to the get.
Result result = table.get(get); // co GetExample-5-DoGet Retrieve row with selected columns from HBase.
byte[] val = result.getValue(Bytes.toBytes("colfam1"),
Bytes.toBytes("qual1")); // co GetExample-6-GetValue Get a specific value for the given column.
System.out.println("Value: " + Bytes.toString(val)); // co GetExample-7-Print Print out the value while converting it back.
// ^^ GetExample
}
}