hbase的api操作

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

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.CellUtil;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.HColumnDescriptor;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.TableName;
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;


public class CreateTableTest {

    static Configuration conf = HBaseConfiguration.create();//读取hbase的配置文件
    
    static HBaseAdmin admin = null;//执行管理员
    
    
public static void main(String[] args) throws Exception{
    
    admin=new HBaseAdmin(conf);
//    createTable();
//    listTable();
//    deleteTable();
//    listTable();
//    putData();
//    scanTable();
    getData();
//    putaLots();
    
    
    
}
//创建表
public static void createTable() throws Exception, IOException{
        //表的描述对象
        HTableDescriptor table=new HTableDescriptor(TableName.valueOf("javaemp1"));
        //列簇
        table.addFamily(new HColumnDescriptor("personal"));
        table.addFamily(new HColumnDescriptor("professional"));
        
        admin.createTable(table);
        System.out.println("create table finished");
}
//列出所有的表
public static void listTable() throws IOException{
    HTableDescriptor[] Tablelist = admin.listTables();
    for(int i=0;i)
    {
        System.out.println(Tablelist[i].getNameAsString());
    }
}
//删除表
public static void deleteTable() throws Exception{
    //删表之前先禁用表
//    admin.disableTable("javaemp1");
//    admin.deleteTable("javaemp1");
//    System.out.println("delete finished");

    //删除表中的某一列簇
//    admin.deleteColumn("javaemp","professional");
//    System.out.println("delete column");
    
    //增加一列
    admin.addColumn("javaemp",new HColumnDescriptor("professional"));
    System.out.println("add column");
    
}
//----------------------------------------------------------------------------------------------------------
//插入数据
public static void putData() throws Exception{
    //HTable类实现对单个表的操作，参数为：配置对象，表名
    HTable table = new HTable(conf,"javaemp");
    
    Put p = new Put(Bytes.toBytes("1001"));//实例化Put类，指定rwo key来操作
    Put p1=new Put(Bytes.toBytes("1002"));
    //
    p.add(Bytes.toBytes("personal"),Bytes.toBytes("name"),Bytes.toBytes("lalisa"));
//    参数：列簇，列，值
    p.add(Bytes.toBytes("personal"),Bytes.toBytes("city"),Bytes.toBytes("beijing"));
    
    table.put(p);
    
    p1.add(Bytes.toBytes("professional"),Bytes.toBytes("designation"),Bytes.toBytes("it"));
    p1.add(Bytes.toBytes("professional"),Bytes.toBytes("salary"),Bytes.toBytes("16010"));
    
    table.put(p1);
    
    System.out.println("put data finished");
    
    table.close();//释放HTable的资源
}
//批量插入数据
public static void putaLots() throws IOException{
    HTable table = new HTable(conf,"javaemp");
    ArrayList list = new ArrayList(10);
    for (int i=0;i)
    {
        Put put = new Put(Bytes.toBytes("row"+i));
        put.add(Bytes.toBytes("personal"),Bytes.toBytes("name"),Bytes.toBytes("people"+i));
        list.add(put);
    }
    table.put(list);
    System.out.println("put list finished");
    }
//获取某一列数据
public static void getData() throws IOException{
    HTable table = new HTable(conf, "javaemp");
    
    Get get = new Get(Bytes.toBytes("1001"));//实例化Get类
    
    Result result = table.get(get);//获取这一row的数据
    
//    输出这一行的某一个字段
    byte[] value = result.getValue(Bytes.toBytes("personal"),Bytes.toBytes("name"));    
    String  name=Bytes.toString(value);
    System.out.println("Name:"+name);
    
    //输出这一行的所有数据
    Cell[] cells = result.rawCells();
    for(Cell cell:cells)
    {
        System.out.print(Bytes.toString(CellUtil.cloneRow(cell))+"--");
        System.out.print(Bytes.toString(CellUtil.cloneFamily(cell))+":");
        System.out.print(Bytes.toString(CellUtil.cloneQualifier(cell))+"->");
        System.out.println(Bytes.toString(CellUtil.cloneValue(cell)));
        
    }
    
    table.close();//释放HTable的资源
}
//scan某一列
public static void scanTable() throws IOException{
    HTable table = new HTable(conf, "javaemp");
    Scan scan = new Scan();                    //    实例化Scan类
    scan.addColumn(Bytes.toBytes("personal"), Bytes.toBytes("name"));//scan某列簇的某列
    scan.addFamily(Bytes.toBytes("professional"));//scan某列簇
    ResultScanner scanner = table.getScanner(scan);
    
    for(Result res=scanner.next();res!=null;res=scanner.next())
    {
        System.out.println(res);
    }
    table.close();//释放HTable的资源
}
//统计row key的个数
public static void count(){
    
}
//关闭hbase
public  static void close() throws IOException{
    admin.shutdown();
}
}