HBase的JAVA API操作詳解

Alt+/   程式碼助手完成一些程式碼的插入，自動顯示提示資訊 

Alt+↓   當前行和下面一行互動位置(特別實用,可以省去先剪下,再貼上了)

Alt+↑   當前行和上面一行互動位置(同上)

Alt+←   前一個編輯的頁面 

Alt+→   下一個編輯的頁面(當然是針對上面那條來說了)

Alt+Shift+M   抽取方法

Alt+Shift+L   抽取本地變數 

Ctrl+1        快速修復 

package Hbase;

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

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.Get;
import org.apache.hadoop.hbase.client.HBaseAdmin;
import org.apache.hadoop.hbase.client.HTable;
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.RetriesExhaustedWithDetailsException;
import org.apache.hadoop.hbase.client.Scan;

public class test {
	private static final String Table_NAME =  "table1";         //表名稱
	private static final String FAMILY_NAME =  "family1"; //列族名稱
	private static final String ROW_KEY = "rowkey1";     //建立行健

	//建立，插入，查詢記錄，遍歷表，刪除表
	public static void main(String[] args) throws Exception {
            Configuration conf=  HBaseConfiguration.create();
            conf.set("hbase.rootdir","hdfs://localhost:9000/hbase");  //設定hbase再hdfs中的目錄
            conf.set("hbase.zookeeper.quorum", "localhost");        //使用zookeeper來進行定位
            //建立刪除表使用HBaseAdmin
            HBaseAdmin hBaseAdmin = new HBaseAdmin(conf);
            createTable(hBaseAdmin);            //建立表
            
            //插入記錄，查詢一條記錄，遍歷所有的記錄Table
             final HTable hTable = new HTable(conf, Table_NAME);
			 putRecord(hTable);         //插入一條記錄
             getRecord(hTable);         //查詢一條記錄
             scanTable(hTable);             //遍歷所有的表的記錄
             hTable.close();          //關閉表
            //deleteTable(hBaseAdmin);              //刪除表
            }

	private static void scanTable(final HTable hTable) throws IOException {
		Scan scan = new Scan();
		 final ResultScanner scanner = hTable.getScanner(scan);
		 for (Result result : scanner) {
			 final byte[] value = result.getValue(FAMILY_NAME.getBytes()	, "age".getBytes());
			 System.out.println(result+"\t" + new String(value));
		}
	}

	private static void getRecord(final HTable hTable) throws IOException {
		Get get = new Get(ROW_KEY.getBytes());
		 final Result result = hTable.get(get );
		 final byte[] value = result.getValue(FAMILY_NAME.getBytes()	, "age".getBytes());
		 System.out.println(result+"\t" + new String(value));
	}

	private static void putRecord(HTable hTable) throws InterruptedIOException,
			RetriesExhaustedWithDetailsException {
		Put put = new Put(ROW_KEY.getBytes());        //宣告物件
		 put.add(FAMILY_NAME .getBytes(), "age".getBytes(),"	12".getBytes());   //新增記錄
		 hTable.put(put );    //插入
	}

	private static void deleteTable(HBaseAdmin hBaseAdmin) throws IOException {
		hBaseAdmin.disableTable(Table_NAME);        //關閉表
		hBaseAdmin.deleteTable(Table_NAME);       //刪除表
	}

	private static void createTable(HBaseAdmin hBaseAdmin) throws IOException {
		if (!hBaseAdmin.tableExists(Table_NAME)){
			HTableDescriptor tableDescriptor = new HTableDescriptor(Table_NAME);    //宣告一個表
			HColumnDescriptor family = new HColumnDescriptor(FAMILY_NAME);       //宣告一個列族
			tableDescriptor.addFamily(family );                                      //新增列族
			hBaseAdmin.createTable(tableDescriptor );                                 //建立表
		}
	}

}