Hbase实例

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.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;



public class OperateTable {

    private static Configuration configuration=null;

    static{

        configuration=HBaseConfiguration.create();

        configuration.set("hbase.zookeeper.quorum", "master");

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

    }

    

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

        HBaseAdmin admin=new HBaseAdmin(configuration);

        if (admin.tableExists(tableName)) {

            System.out.println("表已存在");

            System.exit(0);

        }

        else {

            HTableDescriptor descriptor=new HTableDescriptor(tableName);

            for (String columnFamily:columnFamilys) {

                descriptor.addFamily(new HColumnDescriptor(columnFamily));

            }

            admin.createTable(descriptor);

            System.out.println("创建表成功");

        }

    }

    

    //删除数据库表

    public static void deleteTable(String tableName) throws Exception, ZooKeeperConnectionException {

        HBaseAdmin admin=new HBaseAdmin(configuration);

        if (admin.tableExists(tableName)) {

            admin.disableTable(tableName);

            admin.deleteTable(tableName);

            System.out.println("删除表成功");

        }

        else {

            System.out.println("删除的表不存在");

            System.exit(0);

        }

    }

    

    //添加一条数据

    public static void addRow(String tableName,String row,String columnFamily,String column,String value) throws IOException {

        HTable table=new HTable(configuration,tableName);

        Put put=new Put(Bytes.toBytes(row));

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

        table.put(put);

    }

    

    //删除一条数据

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

        HTable table=new HTable(configuration,tableName);

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

        table.delete(delete);

    }

    

    //删除多条数据

    public static void delMulRows(String tableName,String[] rows) throws Exception{

        HTable table=new HTable(configuration,tableName);

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

        for (String row:rows) {

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

            list.add(delete);

        }

        table.delete(list);

    }

    

    //获取一行数据

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

        HTable table=new HTable(configuration,tableName);

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

        Result result=table.get(get);

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

            System.out.println("Row Name:"+new String(keyValue.getRow())+" ");

            System.out.println("Timestamp:"+keyValue.getTimestamp()+" ");

            System.out.println("Column Family:"+new String(keyValue.getFamily())+" ");

            System.out.println("Row Name:"+new String(keyValue.getQualifier())+" ");

            System.out.println("Value:"+new String(keyValue.getValue())+" ");

        }

    }

    

    //获取所有数据

    public static void  getAllRows(String tableName) throws Exception {

        HTable table=new HTable(configuration,tableName);

        Scan scan=new Scan();

        ResultScanner resultScanner=table.getScanner(scan);

        for(Result result:resultScanner){

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

                System.out.print("Row Name:"+new String(keyValue.getRow())+" ");

                System.out.println("Timestamp:"+keyValue.getTimestamp()+" ");

                System.out.println("Column Family:"+new String(keyValue.getFamily())+" ");

                System.out.println("Row Name:"+new String(keyValue.getQualifier())+" ");

                System.out.println("Value:"+new String(keyValue.getValue())+" ");

            }

        }

    }

    

    public static void main(String[] args) {

        try {

            String tableName="users";

            

            // 第一步：创建数据库表：“users” 

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

            OperateTable.createTable(tableName, columnFamilyStrings);

            

             // 第二步：向数据表的添加数据   

            // 添加第一行数据   

            OperateTable.addRow(tableName, "tht", "info", "age", "20");  

            OperateTable.addRow(tableName, "tht", "info", "sex", "boy");  

            OperateTable.addRow(tableName, "tht", "course", "china", "97");  

            OperateTable.addRow(tableName, "tht", "course", "math", "128");  

            OperateTable.addRow(tableName, "tht", "course", "english", "85");  

            // 添加第二行数据   

            OperateTable.addRow(tableName, "xiaoxue", "info", "age", "19");  

            OperateTable.addRow(tableName, "xiaoxue", "info", "sex", "boy");  

            OperateTable.addRow(tableName, "xiaoxue", "course", "china", "90");  

            OperateTable.addRow(tableName, "xiaoxue", "course", "math", "120");  

            OperateTable.addRow(tableName, "xiaoxue", "course", "english", "90");  

            // 添加第三行数据   

            OperateTable.addRow(tableName, "qingqing", "info", "age", "18");  

            OperateTable.addRow(tableName, "qingqing", "info", "sex", "girl");  

            OperateTable.addRow(tableName, "qingqing", "course", "china", "100");  

            OperateTable.addRow(tableName, "qingqing", "course", "math", "100");  

            OperateTable.addRow(tableName, "qingqing", "course", "english", "99"); 

            

            System.out.println("获取一条数据：");

            OperateTable.getRow(tableName, "tht");

            

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

            OperateTable.getAllRows(tableName);

            

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

            OperateTable.delRow(tableName, "tht");

            OperateTable.getAllRows(tableName);

            

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

            String[] rowsStrings={ "xiaoxue", "qingqing" }; 

            OperateTable.delMulRows(tableName, rowsStrings);

            OperateTable.getAllRows(tableName);

            

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

            OperateTable.deleteTable(tableName);

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

}

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