Hbase java API 的调用例子

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1、首先要在项目中导入Hbase依赖的jar包

2、修改windows中的 C:\Windows\System32\drivers\etc\hosts

10.49.85.152    master
10.49.85.182    slaver1
10.49.85.183    slaver2

3、Java API

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

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.KeyValue;
import org.apache.hadoop.hbase.MasterNotRunningException;
import org.apache.hadoop.hbase.TableName;
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.protobuf.generated.ClientProtos.Column;

public class HBaseDemo {
    static Configuration conf = null;
    static{
        conf = HBaseConfiguration.create();
        conf.set("hbase.rootdir", "hdfs://10.49.85.152:9000/hbase");
        conf.set("hbase.master", "hdfs://10.49.85.152:60000");
        conf.set("hbase.zookeeper.property.clientPort", "2181");
        conf.set("hbase.zookeeper.quorum", "master,slaver1,slaver2");
    }

    //实现了list功能
    public static List<String> getAllTables() throws MasterNotRunningException, ZooKeeperConnectionException, IOException{
        List<String> list = null;
        //HBaseAdmin可以创建表、删除表、查看表
        HBaseAdmin admin = new HBaseAdmin(conf);
        if(admin != null){
            //HTableDescriptor表的相关信息
            HTableDescriptor[] tables = admin.listTables();
            for(HTableDescriptor table : tables){
                System.out.println(table.getNameAsString());
                list = new ArrayList<String>();
                list.add(table.getNameAsString());
            }
        }
        admin.close();
        return list;
    }

    public static int createTabble(String tableName, String[] family) throws MasterNotRunningException, ZooKeeperConnectionException, IOException{
        HBaseAdmin admin = new HBaseAdmin(conf);
        HTableDescriptor table = new HTableDescriptor(TableName.valueOf(tableName));
//      HTableDescriptor table = new HTableDescriptor(tableName);
        //HColumnDescriptor列的相关信息
        for(String str : family){
            HColumnDescriptor cloumn = new HColumnDescriptor(str);
            cloumn.setMaxVersions(3);
            table.addFamily(cloumn);
        }
        if(admin.tableExists(tableName)){
            System.out.println(tableName + "已经存在");
            return -1;
        }

        admin.createTable(table);
        admin.close();
        return 1;
    }

    public static void deleteTable(String tableName) throws MasterNotRunningException, ZooKeeperConnectionException, IOException{
        HBaseAdmin admin = new HBaseAdmin(conf);

        admin.disableTable(tableName);
        admin.deleteTable(tableName);
        System.out.println(tableName + "成功删除");
        admin.close();
    }

    public static void insert(String tableName, String rowkey, String family, String column, String cell) throws IOException{
        Put put = new Put(rowkey.getBytes());
        //HTable负责表的get put delete操作
        HTable table = new HTable(conf, tableName);
        put.add(family.getBytes(), column.getBytes(), cell.getBytes());

        table.put(put);

    }

    public static Result queryByRow(String tableName, String rowkey) throws IOException{
        Get get = new Get(rowkey.getBytes());
        HTable table = new HTable(conf, tableName);
        return table.get(get);
    }

    public static Result queryByColumn(String tableName, String rowkey, String family, String column) throws IOException{
        Get get = new Get(rowkey.getBytes());
        HTable table = new HTable(conf, tableName);
        get.addColumn(family.getBytes(), column.getBytes());
        return table.get(get);
    }

    public static Result queryByRowByVersions(String tableName, String rowkey) throws IOException{
        Get get = new Get(rowkey.getBytes());
        get.setMaxVersions(3);
        HTable table = new HTable(conf, tableName);
        return table.get(get);
    }

    public static ResultScanner queryByScan(String tableName) throws IOException{
        Scan scan = new Scan();
//      scan.setStartRow(startRow);
//      scan.setStopRow(stopRow);
//      scan.addColumn(family, qualifier);
        HTable table = new HTable(conf, tableName);
        return table.getScanner(scan);
    }

    public static void deleteByColumn(String tableName, String rowkey, String family, String column) throws IOException{
        Delete  delete = new Delete(rowkey.getBytes());
        HTable table = new HTable(conf, tableName);
        delete.deleteColumn(family.getBytes(), column.getBytes());
        table.delete(delete);
        System.out.println("成功删除");
    }

    public static void deleteByRow(String tableName, String rowkey) throws IOException{
        Delete  delete = new Delete(rowkey.getBytes());
        HTable table = new HTable(conf, tableName);
        table.delete(delete);
        System.out.println("成功删除");
    }

    public static void main(String[] args) throws MasterNotRunningException, ZooKeeperConnectionException, IOException {
        //1.创建book表
//      createTabble("book", new String[]{"author", "info"});
//      getAllTables();

        //2.删除book表
//      deleteTable("book");
//      getAllTables();

        //3.创建book表
//      createTabble("book", new String[]{"author", "info"});
//      getAllTables();

        //4.book表插入数据
//      insert("book", "rw001", "author", "name", "zhangsan");
//      insert("book", "rw001", "author", "age", "65");
//      insert("book", "rw001", "info", "name", "database");
//      insert("book", "rw001", "info", "price", "35.6");


        //5.按行查询数据(旧方法)
//      Result result = queryByRow("book", "rw001");
//      List<KeyValue> values = result.list();
//      System.out.println("COLUMN\t\t\tCELL ");
//      for(KeyValue value : values){
//          System.out.print(new String(value.getFamily()) + ":");
//          System.out.print(new String(value.getQualifier()) + "\t\t");
//          System.out.print("value = " + new String(value.getValue()) + ",");
//          System.out.println("timestamp = " + value.getTimestamp());
//      }

        //5.按行查询数据(新方法)
//      Result result = queryByRow("book", "rw001");
//      Cell[] cells = result.rawCells();
//      System.out.println("COLUMN\t\t\tCELL ");
//      for(Cell cell : cells){
//          System.out.print(new String(CellUtil.cloneFamily(cell)) + ":");
//          System.out.print(new String(CellUtil.cloneQualifier(cell)) + "\t\t");
//          System.out.print("value = " + new String(CellUtil.cloneValue(cell)) + ",");
//          System.out.println("timestamp = " + cell.getTimestamp());
//      }

        //6.按列查询数据(新方法)
//      Result result = queryByColumn("book", "rw001", "author", "name");
//      Cell[] cells = result.rawCells();
//      System.out.println("COLUMN\t\t\tCELL ");
//      for(Cell cell : cells){
//          System.out.print(new String(CellUtil.cloneFamily(cell)) + ":");
//          System.out.print(new String(CellUtil.cloneQualifier(cell)) + "\t\t");
//          System.out.print("value = " + new String(CellUtil.cloneValue(cell)) + ",");
//          System.out.println("timestamp = " + cell.getTimestamp());
//      }

        //7.scan
//      ResultScanner scanner = queryByScan("book");
//      System.out.println("COLUMN\t\t\tCELL ");
//      for(Result result : scanner){
//          Cell[] cells = result.rawCells();
//          
//          for(Cell cell : cells){
//              System.out.print(new String(CellUtil.cloneFamily(cell)) + ":");
//              System.out.print(new String(CellUtil.cloneQualifier(cell)) + "\t\t");
//              System.out.print("value = " + new String(CellUtil.cloneValue(cell)) + ",");
//              System.out.println("timestamp = " + cell.getTimestamp());
//          }
//      }

        //8.删除某一列
//      deleteByColumn("book", "rw001", "author", "name");

        //9.删除某一行数据
//      deleteByRow("book", "rw001");

        //10. 按行查询多版本数据(新方法)
        Result result = queryByRowByVersions("book", "rw001");
        Cell[] cells = result.rawCells();
        System.out.println("COLUMN\t\t\tCELL ");
        for(Cell cell : cells){
            System.out.print(new String(CellUtil.cloneFamily(cell)) + ":");
            System.out.print(new String(CellUtil.cloneQualifier(cell)) + "\t\t");
            System.out.print("value = " + new String(CellUtil.cloneValue(cell)) + ",");
            System.out.println("timestamp = " + cell.getTimestamp());
        }

    }

}