package client;
// cc IncrementSingleExample Example using the single counter increment methods
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.util.Bytes;
import util.HBaseHelper;
import java.io.IOException;
public class IncrementSingleExample {
public static void main(String[] args) throws IOException {
Configuration conf = HBaseConfiguration.create();
HBaseHelper helper = HBaseHelper.getHelper(conf);
helper.dropTable("counters");
helper.createTable("counters", "daily");
// vv IncrementSingleExample
HTable table = new HTable(conf, "counters");
long cnt1 = table.incrementColumnValue(Bytes.toBytes("20110101"), // co IncrementSingleExample-1-Incr1 Increase counter by one.
Bytes.toBytes("daily"), Bytes.toBytes("hits"), 1);
long cnt2 = table.incrementColumnValue(Bytes.toBytes("20110101"), // co IncrementSingleExample-2-Incr2 Increase counter by one a second time.
Bytes.toBytes("daily"), Bytes.toBytes("hits"), 1);
long current = table.incrementColumnValue(Bytes.toBytes("20110101"), // co IncrementSingleExample-3-GetCurrent Get current value of the counter without increasing it.
Bytes.toBytes("daily"), Bytes.toBytes("hits"), 0);
long cnt3 = table.incrementColumnValue(Bytes.toBytes("20110101"), // co IncrementSingleExample-4-Decr1 Decrease counter by one.
Bytes.toBytes("daily"), Bytes.toBytes("hits"), -1);
// ^^ IncrementSingleExample
System.out.println("cnt1: " + cnt1 + ", cnt2: " + cnt2 +
", current: " + current + ", cnt3: " + cnt3);
}
}