hbase 查询端口 hbase接口

        HBase是一个分布式的、面向列的开源数据库，该技术来源于 Fay Chang 所撰写的Google论文“Bigtable：一个结构化数据的分布式存储系统”。就像Bigtable利用了Google文件系统（File System）所提供的分布式数据存储一样，HBase在Hadoop之上提供了类似于Bigtable的能力。HBase是Apache的Hadoop项目的子项目。HBase不同于一般的关系数据库，它是一个适合于非结构化数据存储的数据库。另一个不同的是HBase基于列的而不是基于行的模式。

 HBase 表一般特点：

1）大：一个表可以有上亿行，上百万列

2）面向列:面向列(族)的存储和权限控制，列(族)独立检索

3）稀疏:对于为空(null)的列并不占用存储空间，表可以设计非常稀疏 

        Java 调用 Hbase 非关系型数据库，Hbase 中提供了相关的 Java API 访问接口便于使用，下面是本人综合网络总结的通过 Java 操作 HBase 进行创建、修改、删除表以及查询等。具体封装代码如下：

package yoodb.hbase;

import java.io.IOException;

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.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.HTablePool;
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 HBaseTest {

    // 声明静态配置
    static Configuration conf = null;
    static final HTablePool tablePool;
    static {
        conf = HBaseConfiguration.create();
        conf.set("hbase.zookeeper.quorum", "yoodb");
        tablePool = new HTablePool(conf, 15);
    }

    /*
     * 创建表
     * @tableName 表名
     * @family 列族数组
     */
    public static void creatTable(String tableName, String[] family)
            throws Exception {
        HBaseAdmin admin = new HBaseAdmin(conf);
        HTableDescriptor desc = new HTableDescriptor(tableName);
        for (int i = 0; i < family.length; i++) {
            desc.addFamily(new HColumnDescriptor(family[i]));
        }
        if (admin.tableExists(tableName)) {
            System.out.println("table Exists!");
            System.exit(0);
        } else {
            admin.createTable(desc);
            System.out.println("create table Success!");
        }
    }

    /*
     * 表添加数据
     * @rowKey rowKey
     * @tableName 表名
     * @column1 第一个列族数组 realname
     * @value1 第一个列的值的数组
     * @column2 第二个列族数组 address
     * @value2 第二个列的值的数组
     */
    public static void addTableData(String rowKey, String tableName,String[] column1, String[] value1, String[] column2, String[] value2)
            throws IOException {
        Put put = new Put(Bytes.toBytes(rowKey));
        HTable table = (HTable) tablePool.getTable(tableName);
        HColumnDescriptor[] columnFamilies = table.getTableDescriptor()
                .getColumnFamilies();

        for (int i = 0; i < columnFamilies.length; i++) {
            String familyName = columnFamilies[i].getNameAsString();
            if (familyName.equals("realname")) {
                for (int j = 0; j < column1.length; j++) {
                    put.add(Bytes.toBytes(familyName),Bytes.toBytes(column1[j]), Bytes.toBytes(value1[j]));
                }
            }
            if (familyName.equals("address")) {
                for (int j = 0; j < column2.length; j++) {
                    put.add(Bytes.toBytes(familyName),Bytes.toBytes(column2[j]), Bytes.toBytes(value2[j]));
                }
            }
        }
        table.put(put);
    }

    /*
     * 更新表中的某一列
     * @tableName 表名
     * @rowKey rowKey
     * @familyName 列族名
     * @columnName 列名
     * @value 更新后的值
     */
    public static void updateTable(String tableName, String rowKey,
            String familyName, String columnName, String value)
            throws IOException {
        HTable table = (HTable) tablePool.getTable(tableName);
        Put put = new Put(Bytes.toBytes(rowKey));
        put.add(Bytes.toBytes(familyName), Bytes.toBytes(columnName),Bytes.toBytes(value));
        table.put(put);
	System.out.println("update table Success!");
    }

    /*
     * 根据rwokey查询
     * @rowKey rowKey
     * @tableName 表名
     */
    public static Result getResult(String tableName, String rowKey)
            throws IOException {
        Get get = new Get(Bytes.toBytes(rowKey));
        HTable table = (HTable) tablePool.getTable(tableName);
        Result result = table.get(get);
        for (KeyValue kv : result.list()) {
            System.out.println("family==>" + Bytes.toString(kv.getFamily()));
            System.out.println("qualifier==>" + Bytes.toString(kv.getQualifier()));
            System.out.println("value==>" + Bytes.toString(kv.getValue()));
            System.out.println("Timestamp==>" + kv.getTimestamp());
        }
        return result;
    }

    /*
     * 遍历查询hbase表数组
     * @tableName 表名
     */
    public static void getResultScann(String tableName) throws IOException {
        Scan scan = new Scan();
        ResultScanner rs = null;
        HTable table = (HTable) tablePool.getTable(tableName);
        try {
            rs = table.getScanner(scan);
            for (Result r : rs) {
                for (KeyValue kv : r.list()) {
                    System.out.println("family==>" + Bytes.toString(kv.getFamily()));
                    System.out.println("qualifier==>" + Bytes.toString(kv.getQualifier()));
                    System.out.println("value==>" + Bytes.toString(kv.getValue()));
                    System.out.println("timestamp==>" + kv.getTimestamp());
                }
            }
        } finally {
            rs.close();
        }
    }

    /*
     * 查询表中的某单一列
     * @tableName 表名
     * @rowKey rowKey
     */
    public static void getResultByColumn(String tableName, String rowKey,
            String familyName, String columnName) throws IOException {
        HTable table = (HTable) tablePool.getTable(tableName);
        Get get = new Get(Bytes.toBytes(rowKey));
        get.addColumn(Bytes.toBytes(familyName), Bytes.toBytes(columnName)); // 获取指定列族以及列中修饰符对应列名
        Result result = table.get(get);
        for (KeyValue kv : result.list()) {
            System.out.println("family==>" + Bytes.toString(kv.getFamily()));
            System.out.println("qualifier==>" + Bytes.toString(kv.getQualifier()));
            System.out.println("value==>" + Bytes.toString(kv.getValue()));
            System.out.println("Timestamp==>" + kv.getTimestamp());
        }
    }

    /*
     * 查询某列数据的多个版本
     * @tableName 表名
     * @rowKey rowKey
     * @familyName 列族名
     * @columnName 列名
     */
    public static void getResultByVersion(String tableName, String rowKey,
            String familyName, String columnName) throws IOException {
        HTable table = (HTable) tablePool.getTable(tableName);
        Get get = new Get(Bytes.toBytes(rowKey));
        get.addColumn(Bytes.toBytes(familyName), Bytes.toBytes(columnName));
        get.setMaxVersions(5);
        Result result = table.get(get);
        for (KeyValue kv : result.list()) {
            System.out.println("family==>" + Bytes.toString(kv.getFamily()));
            System.out.println("qualifier==>" + Bytes.toString(kv.getQualifier()));
            System.out.println("value==>" + Bytes.toString(kv.getValue()));
            System.out.println("Timestamp==>" + kv.getTimestamp());
        }
        
    }

    /*
     * 删除指定的列
     * @tableName 表名
     * @rowKey rowKey
     * @familyName 列族名
     * @columnName 列名
     */
    public static void deleteColumn(String tableName, String rowKey,
            String falilyName, String columnName) throws IOException {
        HTable table = (HTable) tablePool.getTable(tableName);
        Delete deleteColumn = new Delete(Bytes.toBytes(rowKey));
        deleteColumn.deleteColumns(Bytes.toBytes(falilyName),Bytes.toBytes(columnName));
        table.delete(deleteColumn);
        System.out.println(falilyName + "==>" + columnName + "is deleted!");
    }

    /*
     * 删除指定的列
     * @tableName 表名
     * @rowKey rowKey
     */
    public static void deleteAllColumn(String tableName, String rowKey) throws IOException {
        HTable table = (HTable) tablePool.getTable(tableName);
        Delete deleteAll = new Delete(Bytes.toBytes(rowKey));
        table.delete(deleteAll);
        System.out.println("all columns are deleted!");
    }

    /*
     * 删除表
     * 
     * @tableName 表名
     */
    public static void deleteTable(String tableName) throws IOException {
        HBaseAdmin admin = new HBaseAdmin(conf);
        admin.disableTable(tableName);
        admin.deleteTable(tableName);
        System.out.println(tableName + " is deleted!");
    }
}

Java Hbase main函数测试类，具体代码如下：

package com.yoodb;

public class Test {
	public static void main(String[] args) throws Exception {
        // 创建表
        String tableName = "yoodbblog";
        String[] family = { "realname","address" };
        HBaseTest.creatTable(tableName,family);
		// 为表添加数据
		String[] column1 = { "title", "author", "content" }; 
		String[] value1 = {"素文宅","yoodb","www.yoodb.com" }; 
		String[] column2 = { "name", "nickname" };
        String[] value2 = { "真实名称", "昵称" }; 
        HBaseTest.addTableData("rowkey1","yoodbblog",column1, value1, column2, value2);
		// 删除一列
        HBaseTest.deleteColumn("yoodbblog", "rowkey1", "realname", "name");
        // 删除所有列
        HBaseTest.deleteAllColumn("yoodbblog", "rowkey1");
        // 删除表
        HBaseTest.deleteTable("yoodbblog");
        // 查询
        HBaseTest.getResult("yoodbblog", "rowkey1");
        // 查询某一列的值
        HBaseTest.getResultByColumn("yoodbblog", "rowkey1", "realname", "nickname");
        // 修改某一列的值
        HBaseTest.updateTable("yoodbblog", "rowkey1", "realname", "nickname","假昵称");
        // 遍历表数据查询
        HBaseTest.getResultScann("yoodbblog");
        // 查询某列的多版本
        HBaseTest.getResultByVersion("yoodbblog", "rowkey1", "realname", "name");
    }
}