HBase第四天——HBase API 操作

自己的話：我願平東海，身沉心不改；
大海無平期，我心無絕時。

HBase的java代碼開發

一、環境準備

新建項目後在 pom.xml 中添加依賴：

<dependency>
	<groupId>org.apache.hbase</groupId>
	<artifactId>hbase-server</artifactId>
	<version>1.3.1</version>
</dependency>

<dependency>
	<groupId>org.apache.hbase</groupId>
	<artifactId>hbase-client</artifactId>
	<version>1.3.1</version>
</dependency>

<dependency>
	<groupId>jdk.tools</groupId>
	<artifactId>jdk.tools</artifactId>
	<version>1.8</version>
	<scope>system</scope>
	<systemPath>${JAVA_HOME}/lib/tools.jar</systemPath>
</dependency>

二、HBaseAPI

1. 獲取 Configuration 對象、

public static Configuration conf;
static{
//使用 HBaseConfiguration 的單例方法實例化
//創建hbase配置文件
Configuration configuration = HBaseConfiguration.create();
configuration.set("hbase.zookeeper.quorum", "node01:2181,node02:2181,node03:2181");
//創建hbase數據庫連接對象
//org.apache.hadoop.conf.Configuration
Connection connection = ConnectionFactory.createConnection(configuration);
}

2.判斷表是否存在

public static boolean isTableExist(String tableName) throws 
MasterNotRunningException,
ZooKeeperConnectionException, IOException{
//在 HBase 中管理、訪問表需要先創建 HBaseAdmin 對象
//Connection connection = ConnectionFactory.createConnection(conf);
//HBaseAdmin admin = (HBaseAdmin) connection.getAdmin();
HBaseAdmin admin = new HBaseAdmin(conf);
return admin.tableExists(tableName);
}

3.創建表

package com.dfzy.day01;

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.TableName;
import org.apache.hadoop.hbase.client.Admin;
import org.apache.hadoop.hbase.client.Connection;
import org.apache.hadoop.hbase.client.ConnectionFactory;

import java.io.IOException;

//創建表dashuju
public class CreateUser {
    public static void main(String[] args) throws IOException {
        //創建hbase配置文件
        Configuration configuration = HBaseConfiguration.create();
        configuration.set("hbase.zookeeper.quorum", "node01:2181,node02:2181,node03:2181");
        //創建hbase數據庫連接對象
        //org.apache.hadoop.conf.Configuration
        Connection connection = ConnectionFactory.createConnection(configuration);

        //獲取一個用戶
        Admin admin = connection.getAdmin();

        //創建表的描述對象
        //創建表名對象
        TableName tableName = TableName.valueOf("dashuju");
        HTableDescriptor hTableDescriptor = new HTableDescriptor(tableName);
        hTableDescriptor.addFamily(new HColumnDescriptor("f1"));
        hTableDescriptor.addFamily(new HColumnDescriptor("f2"));
        admin.createTable(hTableDescriptor);

        //關閉資源
        admin.close();
        connection.close();

    }

}

4.向表中添加數據（單條）

package com.dfzy.day01;

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.Put;
import org.apache.hadoop.hbase.client.Table;
import org.apache.hadoop.hbase.util.Bytes;

import java.io.IOException;

//添加數據
public class PutData {
    public static void main(String[] args) throws IOException {
        //創建配置文件對象
        Configuration configuration = HBaseConfiguration.create();
        configuration.set("hbase.zookeeper.quorum","node01:2181,node02:2181,node03:2181");
        //創建hbase數據庫連接
        Connection connection = ConnectionFactory.createConnection(configuration);

        //創建表對象
        TableName tableName = TableName.valueOf("dashuju");
        Table table = connection.getTable(tableName);

        //添加數據
        //創建put對象
        Put put = new Put("rk001".getBytes());
        put.addColumn("f1".getBytes(),"name".getBytes(),"zhangsan".getBytes());
        put.addColumn("f1".getBytes(),"age".getBytes(), Bytes.toBytes(20));
        put.addColumn("f2".getBytes(),"address".getBytes(),"diyu".getBytes());
        put.addColumn("f2".getBytes(),"phone".getBytes(),"8888888888".getBytes());
        table.put(put);

        table.close();
        connection.close();
    }
}

5.向表中添加數據（批量）

package com.dfzy.day01;

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.Put;
import org.apache.hadoop.hbase.client.Table;
import org.apache.hadoop.hbase.util.Bytes;

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

//批量添加數據
public class BatchData {
    public static void main(String[] args) throws IOException {
        //創建數據庫連接對象
        Configuration configuration = HBaseConfiguration.create();
        configuration.set("hbase.zookeeper.quorum","node01:2181,node02:2181,node03:2181");
        Connection connection = ConnectionFactory.createConnection(configuration);

        //獲取表對象
        Table table = connection.getTable(TableName.valueOf("dashuju"));

        //添加數據
        //創建put集合
        List<Put> list = new ArrayList<>();

        //創建put對象，並指定rowkey
        Put put = new Put("0002".getBytes());
        put.addColumn("f1".getBytes(),"id".getBytes(),Bytes.toBytes(1));
        put.addColumn("f1".getBytes(),"name".getBytes(),Bytes.toBytes("曹操"));
        put.addColumn("f1".getBytes(),"age".getBytes(),Bytes.toBytes(30));
        put.addColumn("f2".getBytes(),"sex".getBytes(),Bytes.toBytes("1"));
        put.addColumn("f2".getBytes(),"address".getBytes(),Bytes.toBytes("沛國譙縣"));
        put.addColumn("f2".getBytes(),"phone".getBytes(),Bytes.toBytes("16888888888"));
        put.addColumn("f2".getBytes(),"say".getBytes(),Bytes.toBytes("helloworld"));

        Put put2 = new Put("0003".getBytes());
        put2.addColumn("f1".getBytes(),"id".getBytes(),Bytes.toBytes(2));
        put2.addColumn("f1".getBytes(),"name".getBytes(),Bytes.toBytes("劉備"));
        put2.addColumn("f1".getBytes(),"age".getBytes(),Bytes.toBytes(32));
        put2.addColumn("f2".getBytes(),"sex".getBytes(),Bytes.toBytes("1"));
        put2.addColumn("f2".getBytes(),"address".getBytes(),Bytes.toBytes("幽州涿郡涿縣"));
        put2.addColumn("f2".getBytes(),"phone".getBytes(),Bytes.toBytes("17888888888"));
        put2.addColumn("f2".getBytes(),"say".getBytes(),Bytes.toBytes("talk is cheap , show me the code"));


        Put put3 = new Put("0004".getBytes());
        put3.addColumn("f1".getBytes(),"id".getBytes(),Bytes.toBytes(3));
        put3.addColumn("f1".getBytes(),"name".getBytes(),Bytes.toBytes("孫權"));
        put3.addColumn("f1".getBytes(),"age".getBytes(),Bytes.toBytes(35));
        put3.addColumn("f2".getBytes(),"sex".getBytes(),Bytes.toBytes("1"));
        put3.addColumn("f2".getBytes(),"address".getBytes(),Bytes.toBytes("下邳"));
        put3.addColumn("f2".getBytes(),"phone".getBytes(),Bytes.toBytes("12888888888"));
        put3.addColumn("f2".getBytes(),"say".getBytes(),Bytes.toBytes("what are you 弄啥嘞！"));

        Put put4 = new Put("0005".getBytes());
        put4.addColumn("f1".getBytes(),"id".getBytes(),Bytes.toBytes(4));
        put4.addColumn("f1".getBytes(),"name".getBytes(),Bytes.toBytes("諸葛亮"));
        put4.addColumn("f1".getBytes(),"age".getBytes(),Bytes.toBytes(28));
        put4.addColumn("f2".getBytes(),"sex".getBytes(),Bytes.toBytes("1"));
        put4.addColumn("f2".getBytes(),"address".getBytes(),Bytes.toBytes("四川隆中"));
        put4.addColumn("f2".getBytes(),"phone".getBytes(),Bytes.toBytes("14888888888"));
        put4.addColumn("f2".getBytes(),"say".getBytes(),Bytes.toBytes("出師表你背了嘛"));

        Put put5 = new Put("0005".getBytes());
        put5.addColumn("f1".getBytes(),"id".getBytes(),Bytes.toBytes(5));
        put5.addColumn("f1".getBytes(),"name".getBytes(),Bytes.toBytes("司馬懿"));
        put5.addColumn("f1".getBytes(),"age".getBytes(),Bytes.toBytes(27));
        put5.addColumn("f2".getBytes(),"sex".getBytes(),Bytes.toBytes("1"));
        put5.addColumn("f2".getBytes(),"address".getBytes(),Bytes.toBytes("哪裏人有待考究"));
        put5.addColumn("f2".getBytes(),"phone".getBytes(),Bytes.toBytes("15888888888"));
        put5.addColumn("f2".getBytes(),"say".getBytes(),Bytes.toBytes("跟諸葛亮死掐"));


        Put put6 = new Put("0006".getBytes());
        put6.addColumn("f1".getBytes(),"id".getBytes(), Bytes.toBytes(5));
        put6.addColumn("f1".getBytes(),"name".getBytes(),Bytes.toBytes("xiaobubu—呂布"));
        put6.addColumn("f1".getBytes(),"age".getBytes(),Bytes.toBytes(28));
        put6.addColumn("f2".getBytes(),"sex".getBytes(),Bytes.toBytes("1"));
        put6.addColumn("f2".getBytes(),"address".getBytes(),Bytes.toBytes("內蒙人"));
        put6.addColumn("f2".getBytes(),"phone".getBytes(),Bytes.toBytes("15788888888"));
        put6.addColumn("f2".getBytes(),"say".getBytes(),Bytes.toBytes("貂蟬去哪了"));

        list.add(put);
        list.add(put2);
        list.add(put3);
        list.add(put4);
        list.add(put5);
        list.add(put6);

        table.put(list);

        table.close();
        connection.close();

    }
}

6.查詢數據

package com.dfzy.day01;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.*;
import org.apache.hadoop.hbase.util.Bytes;

import java.io.IOException;

//獲取單條數據
public class GetData {
    public static void main(String[] args) throws IOException {
        //創建數據庫連接對象
        Configuration configuration = HBaseConfiguration.create();
        configuration.set("hbase.zookeeper.quorum","node01:2181,node02:2181,node03:2181");
        Connection connection = ConnectionFactory.createConnection(configuration);

        //獲取表名對象
        Table table = connection.getTable(TableName.valueOf("dashuju"));

        //創建get對象
        Get get = new Get("rk001".getBytes());
        Result result = table.get(get);

        //遍歷
        Cell[] cells = result.rawCells();

        for (Cell cell : cells) {
            byte[] value = cell.getValue();
            //判斷列名
            if ("age".equals(Bytes.toString(cell.getQualifier()))){
                System.out.println(Bytes.toInt(value));
            }else{
                System.out.println(Bytes.toString(value));
            }
        }
    }
}

7.獲取所有數據

package com.dfzy.day01;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.*;
import org.apache.hadoop.hbase.util.Bytes;

import java.io.IOException;

//通過scan進行全表掃描
public class ScanData {
    public static void main(String[] args) throws IOException {
        //創建數據庫連接對象
        Configuration configuration = HBaseConfiguration.create();
        configuration.set("hbase.zookeeper.quorum","node01:2181,node02:2181,node03:2181");
        Connection connection = ConnectionFactory.createConnection(configuration);

        //創建表對象
        Table table = connection.getTable(TableName.valueOf("dashuju"));

        //創建掃描器對象
        Scan scan = new Scan();
        ResultScanner scanner = table.getScanner(scan);

        //獲取到每一行數據
        for (Result result : scanner) {
            //獲取單元格數據
            Cell[] cells = result.rawCells();
            for (Cell cell : cells) {
                //獲取列族
                System.out.println(Bytes.toString(cell.getFamilyArray(),
                        cell.getFamilyOffset(),cell.getFamilyLength()));
                //獲取列名
                System.out.println(Bytes.toString(cell.getQualifierArray(),
                        cell.getQualifierOffset(),cell.getQualifierLength()));
                //獲取列值
                System.out.println(Bytes.toString(cell.getValueArray(),
                        cell.getValueOffset(),cell.getValueLength()));
            }
        }
    }
}

8.獲取某幾行的範圍查詢

按照rowkey進行範圍查詢

package com.dfzy.day01;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.*;
import org.apache.hadoop.hbase.filter.CompareFilter;
import org.apache.hadoop.hbase.filter.Filter;
import org.apache.hadoop.hbase.util.Bytes;

import java.io.IOException;

//rowkey的範圍查詢
public class ScanStartRowData {
    public static void main(String[] args) throws IOException {
        //創建數據庫連接對象
        Configuration configuration = HBaseConfiguration.create();
        configuration.set("hbase.zookeeper.quorum","node01:2181,node02:2181,node03:2181");
        Connection connection = ConnectionFactory.createConnection(configuration);

        //創建表對象
        Table table = connection.getTable(TableName.valueOf("dashuju"));

        //創建掃描器對象
        Scan scan = new Scan();
        scan.setStartRow("0002".getBytes());
        scan.setStopRow("0005".getBytes());
        ResultScanner scanner = table.getScanner(scan);

        for (Result result : scanner) {
            System.out.println(Bytes.toString(result.getRow()));
            //單元格數組
            Cell[] cells = result.rawCells();
            //遍歷
            for (Cell cell : cells) {
                System.out.println(Bytes.toString(cell.getValueArray(),
                        cell.getValueOffset(),cell.getValueLength()));
            }
        }

        table.close();
        connection.close();

    }
}

9.獲取某一行指定“列族:列”的數據

按照rowkey查詢指定列族下面的指定列的值

package com.dfzy.day01;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.*;
import org.apache.hadoop.hbase.util.Bytes;

import java.io.IOException;

//通過rowkey查詢指定列族下面的指定列的值
public class GetFamilyData {
    public static void main(String[] args) throws IOException {
        //創建數據庫連接對象
        Configuration configuration = HBaseConfiguration.create();
        configuration.set("hbase.zookeeper.quorum","node01:2181,node02:2181,node03:2181");
        Connection connection = ConnectionFactory.createConnection(configuration);

        //創建表對象
        Table table = connection.getTable(TableName.valueOf("dashuju"));

        //創建get對象
        Get get = new Get("rk001".getBytes());
        get.addColumn("f1".getBytes(),"name".getBytes());
        //開始查詢數據
        Result result = table.get(get);

        //獲取數據
        Cell[] cells = result.rawCells();

        //遍歷
        for (Cell cell : cells) {
            System.out.println(Bytes.toString(cell.getValue()));
        }
    }
}

10.根據rowkey刪除數據

public  void  deleteByRowKey() throws IOException {
        //獲取連接
        Configuration configuration = HBaseConfiguration.create();
        configuration.set("hbase.zookeeper.quorum","node01:2181,node02:2181,node03:2181");
        Connection connection = ConnectionFactory.createConnection(configuration);
        Table myuser = connection.getTable(TableName.valueOf("myuser"));
        Delete delete = new Delete("0001".getBytes());
        myuser.delete(delete);
        myuser.close();
    }

11.刪除表

public static void dropTable(String tableName) throws 
MasterNotRunningException,
ZooKeeperConnectionException, IOException{
HBaseAdmin admin = new HBaseAdmin(conf);
if(isTableExist(tableName)){
admin.disableTable(tableName);
admin.deleteTable(tableName);
System.out.println("表" + tableName + "刪除成功！");
}else{
System.out.println("表" + tableName + "不存在！");
} }

HBase第四天——HBase API 操作

HBase第四天——HBase API 操作

HBase的java代碼開發

一、環境準備

二、HBaseAPI

1. 獲取 Configuration 對象、

2.判斷表是否存在

3.創建表

4.向表中添加數據（單條）

5.向表中添加數據（批量）

6.查詢數據

7.獲取所有數據

8.獲取某幾行的範圍查詢

9.獲取某一行指定“列族:列”的數據

10.根據rowkey刪除數據

11.刪除表

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linux以太網驅動總結

HBase第四天——HBase API 操作

HBase第四天——HBase API 操作

HBase的java代碼開發

一、環境準備

二、HBaseAPI

1. 獲取 Configuration 對象、

2.判斷表是否存在

3.創建表

4.向表中添加數據（單條）

5.向表中添加數據（批量）

6.查詢數據

7.獲取所有數據

8.獲取某幾行的範圍查詢

9.獲取某一行指定“列族:列”的數據

10.根據rowkey刪除數據

11.刪除表

風吹北巷南街傷 花落南國北亭涼

故事很多 未來能有多長

風吹北巷南街傷花落南國北亭涼

故事很多未來能有多長