Hadoop-37 HBase集群 JavaAPI 操作3台云服务器 POM 实现增删改查调用操作 列族信息 扫描全表

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目前已经更新到了:

  • Hadoop
  • HDFS
  • MapReduce
  • Hive
  • Flume
  • Sqoop
  • Zookeeper
  • HBase 正在···

章节内容

上一节我们完成了:

  • HBase Shell 的使用
  • HBase 增、删、改、查等操作
  • HBase列族相关的操作

背景介绍

这里是三台公网云服务器,每台 2C4G,搭建一个Hadoop的学习环境,供我学习。

之前已经在 VM 虚拟机上搭建过一次,但是没留下笔记,这次趁着前几天薅羊毛的3台机器,赶紧尝试在公网上搭建体验一下。

  • 2C4G 编号 h121
  • 2C4G 编号 h122
  • 2C2G 编号 h123

新建工程

新建一个Maven工程,这里就跳过了,不重复描述了。

POM

更新我们的POM文档,加入如下的依赖:

xml 复制代码
<dependency>
    <groupId>org.apache.hbase</groupId>
    <artifactId>hbase-client</artifactId>
    <version>1.3.1</version>
</dependency>

建立新表

java 复制代码
public class Test01 {

    public static void main(String[] args) throws IOException {
        Configuration configuration = HBaseConfiguration.create();
        configuration.set("hbase.zookeeper.quorum", "h121.wzk.icu,h122.wzk.icu");
        configuration.set("hbase.zookeeper.property.clientPort", "2181");
        Connection connection = ConnectionFactory.createConnection(configuration);
        HBaseAdmin admin = (HBaseAdmin) connection.getAdmin();

        // 创建表描述器
        HTableDescriptor descriptor = new HTableDescriptor(TableName.valueOf("test01"));
        // 设置列族描述器
        descriptor.addFamily(new HColumnDescriptor("base_info"));

        // 建立表
        admin.createTable(descriptor);
        System.out.println("test01 表建立完毕");

        admin.close();
        connection.close();
    }

}

运行上面的代码,可以得到如下的结果:

插入数据

java 复制代码
public class Test02 {

    public static void main(String[] args) throws IOException {
        Configuration configuration = HBaseConfiguration.create();
        configuration.set("hbase.zookeeper.quorum", "h121.wzk.icu,h122.wzk.icu");
        configuration.set("hbase.zookeeper.property.clientPort", "2181");
        Connection connection = ConnectionFactory.createConnection(configuration);
        HBaseAdmin admin = (HBaseAdmin) connection.getAdmin();

        // 插入数据
        Table table = connection.getTable(TableName.valueOf("test01"));
        // 设定 row key
        Put put = new Put(Bytes.toBytes("rk1"));
        // 列族 列 值
        put.addColumn(Bytes.toBytes("base_info"), Bytes.toBytes("name"), Bytes.toBytes("wuzikang"));
        // 执行插入
        table.put(put);
        table.close();
        System.out.println("rk1 base_info:name wuzikang 数据插入成功!");

        admin.close();
        connection.close();
    }

}

运行可以获得如下的结果:

删除数据

java 复制代码
public class Test03 {

    public static void main(String[] args) throws IOException {
        Configuration configuration = HBaseConfiguration.create();
        configuration.set("hbase.zookeeper.quorum", "h121.wzk.icu,h122.wzk.icu");
        configuration.set("hbase.zookeeper.property.clientPort", "2181");
        Connection connection = ConnectionFactory.createConnection(configuration);
        HBaseAdmin admin = (HBaseAdmin) connection.getAdmin();

        // 删除数据
        Table table02 = connection.getTable(TableName.valueOf("test01"));
        Delete delete = new Delete(Bytes.toBytes("rk1"));
        table02.delete(delete);
        table02.close();
        System.out.println("rk1 数据删除成功!");

        admin.close();
        connection.close();
    }

}

运行可以获得如下的结果:

获取列族

java 复制代码
public class Test04 {

    public static void main(String[] args) throws IOException {
        Configuration configuration = HBaseConfiguration.create();
        configuration.set("hbase.zookeeper.quorum", "h121.wzk.icu,h122.wzk.icu");
        configuration.set("hbase.zookeeper.property.clientPort", "2181");
        Connection connection = ConnectionFactory.createConnection(configuration);
        HBaseAdmin admin = (HBaseAdmin) connection.getAdmin();

        // 获取某个列族信息
        HTable table = (HTable) connection.getTable(TableName.valueOf("test01"));
        Get get = new Get(Bytes.toBytes("rk1"));
        get.addFamily(Bytes.toBytes("base_info"));
        // 执行查询
        Result result = table.get(get);
        Cell[] cells = result.rawCells();
        for (Cell cell : cells) {
            String cf = Bytes.toString(CellUtil.cloneFamily(cell));
            String column = Bytes.toString(CellUtil.cloneQualifier(cell));
            String value = Bytes.toString(CellUtil.cloneValue(cell));
            String rowKey = Bytes.toString(CellUtil.cloneRow(cell));
            System.out.println("rowKey: " + rowKey + ", " + cf + ", " + column + ", " + value);
        }
        table.close();

        admin.close();
        connection.close();
    }

}

运行可以获得如下的结果:

扫描全表

java 复制代码
public class Test05 {

    public static void main(String[] args) throws IOException {
        Configuration configuration = HBaseConfiguration.create();
        configuration.set("hbase.zookeeper.quorum", "h121.wzk.icu,h122.wzk.icu");
        configuration.set("hbase.zookeeper.property.clientPort", "2181");
        Connection connection = ConnectionFactory.createConnection(configuration);
        HBaseAdmin admin = (HBaseAdmin) connection.getAdmin();

        HTable table = (HTable) connection.getTable(TableName.valueOf("test01"));
        Scan scan = new Scan();
        ResultScanner scanner = table.getScanner(scan);
        for (Result result : scanner) {
            Cell[] cells = result.rawCells();
            for (Cell cell : cells) {
                String cf = Bytes.toString(CellUtil.cloneFamily(cell));
                String column = Bytes.toString(CellUtil.cloneQualifier(cell));
                String value = Bytes.toString(CellUtil.cloneValue(cell));
                String rowkey = Bytes.toString(CellUtil.cloneRow(cell));
                System.out.println("rowKey: " + rowkey + ", " + cf + ", " + column + ", " + value);
            }
        }
        table.close();

        admin.close();
        connection.close();
    }

}

运行可以获得如下结果:

Scan+Row

java 复制代码
public class Test06 {

    public static void main(String[] args) throws IOException {
        Configuration configuration = HBaseConfiguration.create();
        configuration.set("hbase.zookeeper.quorum", "h121.wzk.icu,h122.wzk.icu");
        configuration.set("hbase.zookeeper.property.clientPort", "2181");
        Connection connection = ConnectionFactory.createConnection(configuration);
        HBaseAdmin admin = (HBaseAdmin) connection.getAdmin();

        HTable table = (HTable) connection.getTable(TableName.valueOf("test01"));
        Scan scan = new Scan();
        scan.setStartRow("rk1".getBytes());
        scan.setStopRow("rk2".getBytes());

        ResultScanner scanner = table.getScanner(scan);
        for (Result result : scanner) {
            Cell[] cells = result.rawCells();
            for (Cell cell : cells) {
                String cf = Bytes.toString(CellUtil.cloneFamily(cell));
                String column = Bytes.toString(CellUtil.cloneQualifier(cell));
                String value = Bytes.toString(CellUtil.cloneValue(cell));
                String rowkey = Bytes.toString(CellUtil.cloneRow(cell));
                System.out.println("rowKey: " + rowkey + ", " + cf + ", " + column + ", " + value);
            }
        }
        table.close();


        admin.close();
        connection.close();
    }

}
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