分布式存储系统HBASE-API操作

上一篇介绍了HBase的基本概念，以及其在linux环境下的安装和交互，本文将继续介绍如何通过java和python来操作hbase。

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在通过api操作hbase之前，首先要保证hadoop和hbase已经都启动了。

Java操作HBase

创建一个maven项目，添加基本的依赖：

<properties>
        <hadoop.version>2.10.0</hadoop.version>
        <hbase.version>1.3.6</hbase.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.apache.hadoop</groupId>
            <artifactId>hadoop-client</artifactId>
            <version>${hadoop.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.hadoop</groupId>
            <artifactId>hadoop-common</artifactId>
            <version>${hadoop.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.hbase</groupId>
            <artifactId>hbase-client</artifactId>
            <version>${hbase.version}</version>
        </dependency>
    </dependencies>

通过java api创建表User，并列出所有的表，demo如下:

package cn.howe;

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.*;

import java.io.IOException;

public class HtableTest {

    //配置类
    public static Configuration configuration ;
    // 连接类
    public static Connection connection ;
    // 管理类
    public static Admin admin;

    public static void init() {
        configuration = HBaseConfiguration.create();
        configuration.set("hbase.rootdir", "hdfs://localhost:9000/hbase");
        try {
            connection = ConnectionFactory.createConnection(configuration);
            admin = connection.getAdmin();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) throws Exception {
        init(); // 初始化
        createTable("User", new String[]{"info"});
        listTable();
    }

    public static void listTable() throws Exception {
        System.out.println("**********table:*******");
        TableName[] tableNames = admin.listTableNames();
        for (TableName tableName : tableNames) {
            System.out.println(tableName);
        }
    }

    public static void createTable(String tabName, String[] colFamily) throws IOException {
        TableName tableName = TableName.valueOf(tabName);
        if(admin.tableExists(tableName)) {
            System.out.println("table exists: " + tabName);
        } else {
            HTableDescriptor desc = new HTableDescriptor(tableName);
            // 创建列族
            for (String family : colFamily) {
                HColumnDescriptor fal = new HColumnDescriptor(family);
                desc.addFamily(fal);
            }
            admin.createTable(desc);
            System.out.println("Table create successful!");
        }
    }
}

可以通过命令行查看真的创建成功：

来源：CSDN

作者：还是转转

链接：https://blog.csdn.net/xiaoyi52/article/details/103738691