HBase的基本操作例子

package cn.itcast.hbase;

//import java.io.IOException;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.HColumnDescriptor;
import org.apache.hadoop.hbase.HTableDescriptor;
//import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.Delete;
import org.apache.hadoop.hbase.client.Get;
import org.apache.hadoop.hbase.client.HBaseAdmin;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.client.HTablePool;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.client.ResultScanner;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.util.Bytes;
import org.junit.Before;
import org.junit.Test;

//import org.apache.hadoop.hbase.client.HTablePool;

public class HBaseDemo {

//初始化
private Configuration conf=new Configuration();
@Before
public void init(){
conf = HBaseConfiguration.create();
conf.set("hbase.zookeeper.quorum", "itcast04:2181,itcast05:2181,itcast06:2181");

}
//插入数据put
@Test
public void testPut() throws Exception{
//表对像
HTable table=new HTable(conf, "peoples");
//获取新建列族和表示
Put put=new Put(Bytes.toBytes("kr001"));
put.add(Bytes.toBytes("info"),Bytes.toBytes("name"), Bytes.toBytes("zhangsan"));
put.add(Bytes.toBytes("info"), Bytes.toBytes("age"), Bytes.toBytes("300"));
put.add(Bytes.toBytes("info"), Bytes.toBytes("money"), Bytes.toBytes(3000000));

//插入put
table.put(put);
table.close();
}

@Test
public void testScan() throws IOException{
HTable table = new HTable(conf, "peoples");
Scan scan=new Scan(Bytes.toBytes("kr29990"),Bytes.toBytes("kr30000"));

ResultScanner scanner = table.getScanner(scan);
for(Result result:scanner){
String r=Bytes.toString(result.getValue(Bytes.toBytes("info"), Bytes.toBytes("money")));
System.out.println(r);
}
table.close();
}

/*    @Test
public void testPutAll() throws Exception{
//HTablePool poo=

HTable table=new HTable(conf, "peoples");
List<Put>puts=new ArrayList<Put>(10000);
for(int i=1; i<=1000000;i++)
{
Put put=new Put(Bytes.toBytes("kr"+i));
put.add(Bytes.toBytes("info"),Bytes.toBytes("money"), Bytes.toBytes(""+i));
puts.add(put);
if(i%10000==0)
{
table.put(puts);
puts=new ArrayList<Put>(10000);

}
}
table.put(puts);
table.close();

* 删除
* HTable table=new HTable(conf, "peoples");
Delete del=new Delete(Bytes.toBytes("kr001"));
del.deleteColumns(Bytes.toBytes("info"), Bytes.toBytes("name"));
del.deleteColumn(Bytes.toBytes("info"), Bytes.toBytes("money"));

table.delete(del);

}
*/

@Test
public void testGet() throws IOException{
HTable table=new HTable(conf, "peoples");
Get get=new Get(Bytes.toBytes("kr999999"));

Result result = table.get(get);
String r=Bytes.toString(result.getValue(Bytes.toBytes("info"), Bytes.toBytes("money")));
System.out.println(r);
table.close();

}

/*    public static void main(String[] args) throws Exception {
// TODO 自动生成的方法存根
Configuration conf=HBaseConfiguration.create();
//连接zookeeper
conf.set("hbase.zookeeper.quorum", "itcast04:2181,itcast05:2181,itcast06:2181");
//conf.set("ha.zookeeper.quorum", "192.168.80.204:2181,192.168.80.205:2181,192.168.80.206:2181");
//获取表的对象hbaseasmin
HBaseAdmin admin = new HBaseAdmin(conf);

//定义表名
HTableDescriptor htd=new HTableDescriptor(TableName.valueOf("peoples"));
//定义表中列族1
HColumnDescriptor hcd_info=new HColumnDescriptor("info");
hcd_info.setMaxVersions(3);

//第一列族2
HColumnDescriptor hcd_data=new HColumnDescriptor("data");

htd.addFamily(hcd_info);
htd.addFamily(hcd_data);

admin.createTable(htd);
admin.close();
}*/

//删除
@Test
public void testDel() throws IOException
{
HTable table=new HTable(conf, "peoples");
Delete del=new Delete(Bytes.toBytes("kr999999"));
/*del.deleteColumns(Bytes.toBytes("info"), Bytes.toBytes("name"));
del.deleteColumn(Bytes.toBytes("info"), Bytes.toBytes("money"));*/

table.delete(del);
table.close();

}

}