Hbase访问方式

Hbase访问方式

Hbase shell命令操作

Hbase shell命令操作--general操作

首先启动Hbase

启动shell

查看表结构

删除一个表

创建表和查看表结构

插入几条数据

查看有哪些数据

获取一个Row Key 的所以数据

获取一个Row Key，一个列簇 的所以数据

获取一个Row Key，一个列簇中其中一列的所以数据

更新一条数据

扫描全表

删除列簇的其中一个列

统计表中的总行数

清空表的内容

Hbase java 编程

Hbase java 编程 -- 程序设计步骤

HbaseTest.java 参考代码

package com.dajiangtai.hadoop.hbase;

import java.io.IOException;

import javax.ws.rs.PUT;

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.MasterNotRunningException;
import org.apache.hadoop.hbase.ZooKeeperConnectionException;
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.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 com.sun.xml.internal.ws.api.ha.StickyFeature;

public class HbaseTest {
   public static Configuration conf;
   static {
       conf = HBaseConfiguration.create();//第一步
       conf.set("hbase.zookeeper.quorum", "dajiangtai1,dajiangtai2,dajiangtai3,dajiangtai4,dajiangtai5");
       conf.set("hbase.zookeeper.property.clientPort", "");
       conf.set("hbase.master", "dajiangtai1:60000");
   }

   public static void main(String[] args) throws IOException{
       //createTable("member");
      //insertDataByPut("member");
       QueryByGet("member");
       //QueryByScan("member");
      //deletData("member");
   }

   public static void createTable(String tableName) throws MasterNotRunningException,ZooKeeperConnectionException,
   IOException{
       HBaseAdmin hBaseAdmin = new HBaseAdmin(conf);//创建HBaseAdmin对象
      // 先判断这个表是否存在
        if(hBaseAdmin.tableExists(tableName)){
           hBaseAdmin.disableTable(tableName);
           hBaseAdmin.deleteTable(tableName);
       }
      HTableDescriptor tableDescriptor = new HTableDescriptor(tableName);//将表名称传进去实例化HTableDescriptor这个表
      //添加family
      tableDescriptor.addFamily(new HColumnDescriptor("address"));
      tableDescriptor.addFamily(new HColumnDescriptor("info"));

      hBaseAdmin.createTable(tableDescriptor);//创建表

      hBaseAdmin.close();//释放资源

   }
   
  //插入数据方法
   public static void insertDataByPut(String tableName) throws IOException
   {
       HTable table = new HTable(conf,tableName);

       Put put1= new Put(getBytes("djt"));
       put1.add(getBytes("address"),getBytes("country"),getBytes("china"));
       put1.add(getBytes("address"),getBytes("province"),getBytes("beijing"));
       put1.add(getBytes("address"),getBytes("city"),getBytes("beijing"));

       put1.add(getBytes("info"),getBytes("age"),getBytes(""));
       put1.add(getBytes("info"),getBytes("birthday"),getBytes("1988-12-12"));
       put1.add(getBytes("info"),getBytes("company"),getBytes("dajiangtai"));

       table.put(put1); //插入数据

       table.close();  //释放资源
   }
   
//查询数据
   public static void QueryByGet(String tableName) throws IOException{
       HTable table =new HTable(conf,tableName);
       Get get = new Get(getBytes("djt")); //根据rowkey查询
       Result r=table.get(get); //执行操作
       System.out.println("获得到rowkey:"+new String(r.getRow()));
    for(KeyValue keyValue : r.raw()){
        System.out.println("列簇："  +  new String(keyValue.getFamily())
        + "====列" + new String(keyValue.getQualifier()) + "====值"
        +  new String(keyValue.getValue())  );
    }

    table.close();
   }

   public static void QueryByScan(String tableName) throws IOException{
       HTable table =new HTable(conf,tableName);
       Scan scan = new Scan();
       scan.addColumn(getBytes("info"),getBytes("company"));
       ResultScanner scanner = table.getScanner(scan);
       for(Result r : scanner) {
           System.out.println("获得到rowkey:" +  new String(r.getRow()));
           for(KeyValue kv : r.raw()){
               System.out.println("列簇："  + new String(kv.getFamily())
        + "====列" + new String(kv.getQualifier()) + "====值"
        +  new String(kv.getValue())  );
           }
       }

       scanner.close();
       table.close();
   }

   public static void deleteData(String tableName) throws IOException{
       HTable table = new HTable(conf,tableName);
       Delete delete = new Delete(getBytes("djt"));
       delete.deleteColumn(getBytes("info"),getBytes("age"));
       table.delete(delete);
       table.close();
   }
   //转化byte数组
   public static byte[] getBytes(String str){
       if(str == null)
           str="";
       return Bytes.toBytes(str);
   }

}

现在集群里吧存在的表删除掉

在main()方法执行一下

查看表的结构

执行插入数据

如何进行查询

进行扫描

如何进行删除数据

执行后

Hbase MapReduce编程