java操作Hbase实例

/*

 * 创建一个students表,并进行相关操作

 */

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.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;

public class HBaseDBDao {

    // 声明静态配置

    private static Configuration conf = null;

    static {

        conf = HBaseConfiguration.create();

        conf.set("hbase.zookeeper.quorum", "192.168.1.154");

        conf.set("hbase.zookeeper.property.clientPort", "2181");

        conf.set("hbase.master", "192.168.1.154:6000");

    }

    //判断表是否存在

    private static boolean isExist(String tableName) throws IOException {

        HBaseAdmin hAdmin = new HBaseAdmin(conf);

        return hAdmin.tableExists(tableName);

    }

    // 创建数据库表

    public static void createTable(String tableName, String[] columnFamilys)

            throws Exception {

        // 新建一个数据库管理员

        HBaseAdmin hAdmin = new HBaseAdmin(conf);

        if (hAdmin.tableExists(tableName)) {

            System.out.println("表 "+tableName+" 已存在！");

            System.exit(0);

        } else {

            // 新建一个students表的描述

            HTableDescriptor tableDesc = new HTableDescriptor(tableName);

            // 在描述里添加列族

            for (String columnFamily : columnFamilys) {

                tableDesc.addFamily(new HColumnDescriptor(columnFamily));

            }

            // 根据配置好的描述建表

            hAdmin.createTable(tableDesc);

            System.out.println("创建表 "+tableName+" 成功!");

        }

    }

    // 删除数据库表

    public static void deleteTable(String tableName) throws Exception {

        // 新建一个数据库管理员

        HBaseAdmin hAdmin = new HBaseAdmin(conf);

        if (hAdmin.tableExists(tableName)) {

            // 关闭一个表

            hAdmin.disableTable(tableName);

            hAdmin.deleteTable(tableName);

            System.out.println("删除表 "+tableName+" 成功！");

        } else {

            System.out.println("删除的表 "+tableName+" 不存在！");

            System.exit(0);

        }

    }

    // 添加一条数据

    public static void addRow(String tableName, String row,

            String columnFamily, String column, String value) throws Exception {

        HTable table = new HTable(conf, tableName);

        Put put = new Put(Bytes.toBytes(row));// 指定行

        // 参数分别:列族、列、值

        put.add(Bytes.toBytes(columnFamily), Bytes.toBytes(column),

                Bytes.toBytes(value));

        table.put(put);

    }

    // 删除一条(行)数据

    public static void delRow(String tableName, String row) throws Exception {

        HTable table = new HTable(conf, tableName);

        Delete del = new Delete(Bytes.toBytes(row));

        table.delete(del);

    }

    // 删除多条数据

    public static void delMultiRows(String tableName, String[] rows)

            throws Exception {

        HTable table = new HTable(conf, tableName);

        List<Delete> delList = new ArrayList<Delete>();

        for (String row : rows) {

            Delete del = new Delete(Bytes.toBytes(row));

            delList.add(del);

        }

        table.delete(delList);

    }

    // 获取一条数据

    public static void getRow(String tableName, String row) throws Exception {

        HTable table = new HTable(conf, tableName);

        Get get = new Get(Bytes.toBytes(row));

        Result result = table.get(get);

        // 输出结果,raw方法返回所有keyvalue数组

        for (KeyValue rowKV : result.raw()) {

            System.out.print("行名:" + new String(rowKV.getRow()) + " ");

            System.out.print("时间戳:" + rowKV.getTimestamp() + " ");

            System.out.print("列族名:" + new String(rowKV.getFamily()) + " ");

            System.out.print("列名:" + new String(rowKV.getQualifier()) + " ");

            System.out.println("值:" + new String(rowKV.getValue()));

        }

    }

    // 获取所有数据

    public static void getAllRows(String tableName) throws Exception {

        HTable table = new HTable(conf, tableName);

        Scan scan = new Scan();

        ResultScanner results = table.getScanner(scan);

        // 输出结果

        for (Result result : results) {

            for (KeyValue rowKV : result.raw()) {

                System.out.print("行名:" + new String(rowKV.getRow()) + " ");

                System.out.print("时间戳:" + rowKV.getTimestamp() + " ");

                System.out.print("列族名:" + new String(rowKV.getFamily()) + " ");

                System.out

                        .print("列名:" + new String(rowKV.getQualifier()) + " ");

                System.out.println("值:" + new String(rowKV.getValue()));

            }

        }

    }

    // 主函数

    public static void main(String[] args) {

        try {

            String tableName = "student";

            // 第一步：创建数据库表：“student”

            String[] columnFamilys = { "info", "course" };

            HBaseDBDao.createTable(tableName, columnFamilys);

            // 第二步：向数据表的添加数据

            // 添加第一行数据

            if (isExist(tableName)) {

                HBaseDBDao.addRow(tableName, "zpc", "info", "age", "20");

                HBaseDBDao.addRow(tableName, "zpc", "info", "sex", "boy");

                HBaseDBDao.addRow(tableName, "zpc", "course", "china", "97");

                HBaseDBDao.addRow(tableName, "zpc", "course", "math", "128");

                HBaseDBDao.addRow(tableName, "zpc", "course", "english", "85");

                // 添加第二行数据

                HBaseDBDao.addRow(tableName, "henjun", "info", "age", "19");

                HBaseDBDao.addRow(tableName, "henjun", "info", "sex", "boy");

                HBaseDBDao.addRow(tableName, "henjun", "course", "china","90");

                HBaseDBDao.addRow(tableName, "henjun", "course", "math","120");

                HBaseDBDao.addRow(tableName, "henjun", "course", "english","90");

                // 添加第三行数据

                HBaseDBDao.addRow(tableName, "niaopeng", "info", "age", "18");

                HBaseDBDao.addRow(tableName, "niaopeng", "info", "sex","girl");

                HBaseDBDao.addRow(tableName, "niaopeng", "course", "china","100");

                HBaseDBDao.addRow(tableName, "niaopeng", "course", "math","100");

                HBaseDBDao.addRow(tableName, "niaopeng", "course", "english","99");

                // 第三步：获取一条数据

                System.out.println("**************获取一条(zpc)数据*************");

                HBaseDBDao.getRow(tableName, "zpc");

                // 第四步：获取所有数据

                System.out.println("**************获取所有数据***************");

                HBaseDBDao.getAllRows(tableName);

                // 第五步：删除一条数据

                System.out.println("************删除一条(zpc)数据************");

                HBaseDBDao.delRow(tableName, "zpc");

                HBaseDBDao.getAllRows(tableName);

                // 第六步：删除多条数据

                System.out.println("**************删除多条数据***************");

                String rows[] = new String[] { "henjun","niaopeng" };

                HBaseDBDao.delMultiRows(tableName, rows);

                HBaseDBDao.getAllRows(tableName);

                // 第七步：删除数据库

                System.out.println("***************删除数据库表**************");

                HBaseDBDao.deleteTable(tableName);

                System.out.println("表"+tableName+"存在吗？"+isExist(tableName));

            } else {

                System.out.println(tableName + "此数据库表不存在！");

            }

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

}