hbase 实战项目

首先 根据 hadoop 搭建 + hbase 搭建把 环境弄好

由于 hbase 依赖于 hdfs ，所以 需要 进入 hadoop --》sbin  下 启动 start-dfs.sh , start-yarn.sh
然后 进 hbase --> 下 启动 start-hbase.sh  如果 后面 运行失败 报 找不到 zookeeper 八成 你需要进 hbase-bin-> stop-hbase 然后 重run  start-hbase.sh

这里列举下 hbase shell 的常用操作

#最有用命令 help
help 'status'
#建表
create 'FileTable','fileInfo','saveInfo'
#列出有哪些表
list
#描述表信息
desc 'FileTable'
#统计 表
count 'FileTable'
#添加列簇
alter 'FileTable','cf'
# 删除列簇 ,一定要注意大小写
alter 'FileTable',{NAME=>'cf',METHOD=>'delete'}

#插入数据
put 'FileTable','rowkey1','fileInfo:name','file1.txt'
0 row(s) in 3.9840 seconds
put 'FileTable','rowkey1','fileInfo:type','txt'
0 row(s) in 0.0410 seconds
put 'FileTable','rowkey1','fileInfo:size','1024'
0 row(s) in 0.1100 seconds
put 'FileTable','rowkey1','saveInfo:path','/home/pics'
0 row(s) in 0.1320 seconds
put 'FileTable' , 'rowkey1','saveInfo:creator','tom'
0 row(s) in 0.1430 seconds
#查询表总行数
hbase(main):016:0> count 'FileTable'
1 row(s) in 0.8500 seconds
# get 查询
get 'FileTable','rowkey1'
get 'FileTable','rowkey1','fileInfo'

#delete

#deleteall

#scan

#删除表之前必须先禁用表Drop the named table. Table must first be disabled:
disable 'FileTable'

is_enabled
is_disabled

drop 'FileTable'

查询所有列簇

查询指定列簇

HBase 连接类

package com.ghc.hbase.api;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.Connection;
import org.apache.hadoop.hbase.client.ConnectionFactory;
import org.apache.hadoop.hbase.client.Table;

import java.io.IOException;

public class HBaseConn {
    private static final HBaseConn INSTANCE = new HBaseConn();
    private static Configuration configuration;
    private static Connection connection;

    private HBaseConn(){
        try{
            if(configuration == null){
                configuration = HBaseConfiguration.create();
                configuration.set("hbase.zookeeper.quorum","192.168.32.129:2181");
            }
        }catch(Exception e){
            e.printStackTrace();
        }
    }
    private Connection getConnection(){
        if(connection == null || connection.isClosed()){
            try{
                connection = ConnectionFactory.createConnection(configuration);
            }catch(IOException e){
                e.printStackTrace();
            }
        }
        return connection;
    }

    public static Connection getHBaseConnection(){
        return INSTANCE.getConnection();
    }

    public static Table getTable(String tableName) throws IOException{
        return INSTANCE.getConnection().getTable(TableName.valueOf(tableName));
    }

    public static void closeConn(){
        if(connection != null){
            try{
                connection.close();
            }catch (IOException e){
                e.printStackTrace();
            }
        }
    }
}

junit 测试一波连接类

import com.ghc.hbase.api.HBaseConn;
import org.apache.hadoop.hbase.client.Connection;
import org.apache.hadoop.hbase.client.Table;
import org.junit.Test;

import java.io.IOException;

public class HBaseConnTest {
    @Test
    public void getConnTest(){
        Connection conn = HBaseConn.getHBaseConnection();
        System.out.println(conn.isClosed());
        HBaseConn.closeConn();
        System.out.println(conn.isClosed());
    }
    @Test
    public void getTableTest(){
        Table table = null;
        try{table = HBaseConn.getTable("FileTable");
            System.out.println(table.getName());
        }catch(IOException ioe){
            ioe.printStackTrace();
        }
    }
}

hbase 增删操作类

package com.ghc.hbase.api;

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.*;
import org.apache.hadoop.hbase.filter.FilterList;
import org.apache.hadoop.hbase.util.Bytes;

import java.io.IOException;
import java.util.Arrays;
import java.util.List;
import java.util.Scanner;

public class HBaseUtil {

    public static Boolean createTable(String tableName,String[] cfs){
        try(HBaseAdmin admin = (HBaseAdmin)HBaseConn.getHBaseConnection().getAdmin()){
                if(admin.tableExists(tableName)) {
                    return false;
                }
                // 不存在 则创建
                HTableDescriptor  hTableDescriptor = new HTableDescriptor(TableName.valueOf(tableName));
                Arrays.stream(cfs).forEach(cf->{
                    HColumnDescriptor hColumnDescriptor = new HColumnDescriptor(cf);
                    hColumnDescriptor.setMaxVersions(1);
                    hTableDescriptor.addFamily(hColumnDescriptor);
                });
                admin.createTable(hTableDescriptor);
            }catch(Exception e){
                e.printStackTrace();
            }
            return true;
        }
    public static Boolean putRow(String tableName, String rowKey, String cfName,String qualifier,String data){
        try(Table table = HBaseConn.getTable(tableName)){
            Put put = new Put(Bytes.toBytes(rowKey));
            put.addColumn(Bytes.toBytes(cfName), Bytes.toBytes(qualifier), Bytes.toBytes(data));
            table.put(put);
        }catch (IOException ioe){
            ioe.printStackTrace();
        }
        return true;
    }

    public static Boolean putRows(String tableName,List<Put> puts){
        try(Table table = HBaseConn.getTable(tableName)){
            table.put(puts);
        }catch(IOException ioe){
            ioe.printStackTrace();
        }
        return true;
    }

    public static Result getRow(String tableName, String rowKey){
        try(Table table = HBaseConn.getTable(tableName)){
            Get get = new Get(Bytes.toBytes(rowKey));
            return table.get(get);
        }catch(IOException ioe){
            ioe.printStackTrace();
        }
        return null;
    }

    public static Result getRow(String tableName, String rowKey, FilterList filterList){
        try(Table table = HBaseConn.getTable(tableName)){
            Get get = new Get(Bytes.toBytes(rowKey));
            get.setFilter(filterList);
            return table.get(get);
        }catch(IOException ioe){
            ioe.printStackTrace();
        }
        return null;
    }

    public static ResultScanner getScanner(String tableName){
        try(Table table = HBaseConn.getTable(tableName)){
            Scan scan = new Scan();
            scan.setCaching(1000);
            return table.getScanner(scan);
        }catch(IOException ioe){
            ioe.printStackTrace();
        }
        return null;
    }

    public static ResultScanner getScanner(String tableName, String startRowKey, String endRowKey){
        try(Table table = HBaseConn.getTable(tableName)){
            Scan  scan = new Scan();
            scan.setStartRow(Bytes.toBytes(startRowKey));
            scan.setStopRow(Bytes.toBytes(endRowKey));
            scan.setCaching(1000);
            return table.getScanner(scan);
        }catch(IOException ioe){
            ioe.printStackTrace();
        }
        return null;
    }

    // 使用过滤器
    public static ResultScanner getScanner(String tableName, String startRowKey, String endRowKey, FilterList filterList){
        try(Table table = HBaseConn.getTable(tableName)){
            Scan scan = new Scan();
            scan.setStartRow(Bytes.toBytes(startRowKey));
            scan.setStopRow(Bytes.toBytes(endRowKey));
            scan.setCaching(1000);
            scan.setFilter(filterList);
            return table.getScanner(scan);
        }catch(IOException ioe){
            ioe.printStackTrace();
        }
        return null;
    }

    // 删除
    public static Boolean deleteRow(String tableName,String rowKey){
        try(Table table = HBaseConn.getTable(tableName)){
            Delete delete = new Delete(Bytes.toBytes(rowKey));
            table.delete(delete);
            return true;
        }catch(IOException ioe){ioe.printStackTrace();}
        return null;
    }

    // 删除 列簇 用 admin
    public static Boolean deleteColumnFamily(String tableName,String cfName){
        try(HBaseAdmin admin = (HBaseAdmin)HBaseConn.getHBaseConnection().getAdmin()){
            admin.deleteColumn(tableName,cfName);
        }catch(IOException ioe){
            ioe.printStackTrace();
        }
        return true;
    }
    //删除 某列 用 table
    public static Boolean deleteQualifier(String tableName, String rowKey, String cfName,String qualifier){
        try(Table table = HBaseConn.getTable(tableName)){
            Delete delete = new Delete(Bytes.toBytes(rowKey));
            delete.addColumn(Bytes.toBytes(cfName),Bytes.toBytes(qualifier));
            table.delete(delete);
            return true;
        }catch(IOException ioe){
            ioe.printStackTrace();
        }
        return null;
    }
}