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HBase--JavaAPI的操作，建立表修改表，增删改查資料

DDL：  

public class HbaseClientDemo {
	Connection conn = null;
	
	@Before
	public void getConn() throws Exception{
		// 建構一個連接配接對象
		Configuration conf = HBaseConfiguration.create(); // 會自動加載hbase-site.xml
		conf.set("hbase.zookeeper.quorum", "hdp-01:2181,hdp-02:2181,hdp-03:2181");
		
		conn = ConnectionFactory.createConnection(conf);
	}
	
	
	
	/**
	 * DDL
	 * @throws Exception 
	 */
	@Test
	public void testCreateTable() throws Exception{

		// 從連接配接中構造一個DDL操作器
		Admin admin = conn.getAdmin();
		
		// 建立一個表定義描述對象
		HTableDescriptor hTableDescriptor = new HTableDescriptor(TableName.valueOf("user_info"));
		
		// 建立列族定義描述對象
		HColumnDescriptor hColumnDescriptor_1 = new HColumnDescriptor("base_info");
		hColumnDescriptor_1.setMaxVersions(3); // 設定該列族中存儲資料的最大版本數,預設是1
		
		HColumnDescriptor hColumnDescriptor_2 = new HColumnDescriptor("extra_info");
		
		// 将列族定義資訊對象放入表定義對象中
		hTableDescriptor.addFamily(hColumnDescriptor_1);
		hTableDescriptor.addFamily(hColumnDescriptor_2);
		
		
		// 用ddl操作器對象：admin 來建表
		admin.createTable(hTableDescriptor);
		
		// 關閉連接配接
		admin.close();
		conn.close();
		
	}
	
	
	/**
	 * 删除表
	 * @throws Exception 
	 */
	@Test
	public void testDropTable() throws Exception{
		
		Admin admin = conn.getAdmin();
		
		// 停用表
		admin.disableTable(TableName.valueOf("user_info"));
		// 删除表
		admin.deleteTable(TableName.valueOf("user_info"));
		
		
		admin.close();
		conn.close();
	}
	
	// 修改表定義--添加一個列族
	@Test
	public void testAlterTable() throws Exception{
		
		Admin admin = conn.getAdmin();
		
		// 取出舊的表定義資訊
		HTableDescriptor tableDescriptor = admin.getTableDescriptor(TableName.valueOf("user_info"));
		
		
		// 新構造一個列族定義
		HColumnDescriptor hColumnDescriptor = new HColumnDescriptor("other_info");
		hColumnDescriptor.setBloomFilterType(BloomType.ROWCOL); // 設定該列族的布隆過濾器類型
		
		// 将列族定義添加到表定義對象中
		tableDescriptor.addFamily(hColumnDescriptor);
		
		
		// 将修改過的表定義交給admin去送出
		admin.modifyTable(TableName.valueOf("user_info"), tableDescriptor);
		
		
		admin.close();
		conn.close();
		
	}
	
	
	/**
	 * DML -- 資料的增删改查
	 */
	
	

}

DML:  

public class HbaseClientDML {
	Connection conn = null;
	
	@Before
	public void getConn() throws Exception{
		// 建構一個連接配接對象
		Configuration conf = HBaseConfiguration.create(); // 會自動加載hbase-site.xml
		conf.set("hbase.zookeeper.quorum", "hdp-01:2181,hdp-02:2181,hdp-03:2181");
		
		conn = ConnectionFactory.createConnection(conf);
	}
	
	
	/**
	 * 增
	 * 改:put來覆寫
	 * @throws Exception 
	 */
	@Test
	public void testPut() throws Exception{
		
		// 擷取一個操作指定表的table對象,進行DML操作
		Table table = conn.getTable(TableName.valueOf("user_info"));
		
		// 構造要插入的資料為一個Put類型(一個put對象隻能對應一個rowkey)的對象
		Put put = new Put(Bytes.toBytes("001"));
		put.addColumn(Bytes.toBytes("base_info"), Bytes.toBytes("username"), Bytes.toBytes("張三"));
		put.addColumn(Bytes.toBytes("base_info"), Bytes.toBytes("age"), Bytes.toBytes("18"));
		put.addColumn(Bytes.toBytes("extra_info"), Bytes.toBytes("addr"), Bytes.toBytes("北京"));
		
		
		Put put2 = new Put(Bytes.toBytes("002"));
		put2.addColumn(Bytes.toBytes("base_info"), Bytes.toBytes("username"), Bytes.toBytes("李四"));
		put2.addColumn(Bytes.toBytes("base_info"), Bytes.toBytes("age"), Bytes.toBytes("28"));
		put2.addColumn(Bytes.toBytes("extra_info"), Bytes.toBytes("addr"), Bytes.toBytes("上海"));
	
		
		ArrayList<Put> puts = new ArrayList<>();
		puts.add(put);
		puts.add(put2);
		
		
		// 插進去
		table.put(puts);
		
		table.close();
		conn.close();
		
	}
	
	
	/**
	 * 循環插入大量資料
	 * @throws Exception 
	 */
	@Test
	public void testManyPuts() throws Exception{
		
		Table table = conn.getTable(TableName.valueOf("user_info"));
		ArrayList<Put> puts = new ArrayList<>();
		
		for(int i=0;i<100000;i++){
			Put put = new Put(Bytes.toBytes(""+i));
			put.addColumn(Bytes.toBytes("base_info"), Bytes.toBytes("username"), Bytes.toBytes("張三"+i));
			put.addColumn(Bytes.toBytes("base_info"), Bytes.toBytes("age"), Bytes.toBytes((18+i)+""));
			put.addColumn(Bytes.toBytes("extra_info"), Bytes.toBytes("addr"), Bytes.toBytes("北京"));
			
			puts.add(put);
		}
		
		table.put(puts);
		
	}
	
	/**
	 * 删
	 * @throws Exception 
	 */
	@Test
	public void testDelete() throws Exception{
		Table table = conn.getTable(TableName.valueOf("user_info"));
		
		// 構造一個對象封裝要删除的資料資訊
		Delete delete1 = new Delete(Bytes.toBytes("001"));
		
		Delete delete2 = new Delete(Bytes.toBytes("002"));
		delete2.addColumn(Bytes.toBytes("extra_info"), Bytes.toBytes("addr"));
		
		ArrayList<Delete> dels = new ArrayList<>();
		dels.add(delete1);
		dels.add(delete2);
		
		table.delete(dels);
		
		
		table.close();
		conn.close();
	}
	
	/**
	 * 查
	 * @throws Exception 
	 */
	@Test
	public void testGet() throws Exception{
		
		Table table = conn.getTable(TableName.valueOf("user_info"));
		
		Get get = new Get("002".getBytes());
		
		Result result = table.get(get);
		
		// 從結果中取使用者指定的某個key的value
		byte[] value = result.getValue("base_info".getBytes(), "age".getBytes());
		System.out.println(new String(value));
		
		System.out.println("-------------------------");
		
		// 周遊整行結果中的所有kv單元格
		CellScanner cellScanner = result.cellScanner();
		while(cellScanner.advance()){
			Cell cell = cellScanner.current();
			
			byte[] rowArray = cell.getRowArray();  //本kv所屬的行鍵的位元組數組
			byte[] familyArray = cell.getFamilyArray();  //列族名的位元組數組
			byte[] qualifierArray = cell.getQualifierArray();  //列名的位元組資料
			byte[] valueArray = cell.getValueArray(); // value的位元組數組
			
			System.out.println("行鍵: "+new String(rowArray,cell.getRowOffset(),cell.getRowLength()));
			System.out.println("列族名: "+new String(familyArray,cell.getFamilyOffset(),cell.getFamilyLength()));
			System.out.println("列名: "+new String(qualifierArray,cell.getQualifierOffset(),cell.getQualifierLength()));
			System.out.println("value: "+new String(valueArray,cell.getValueOffset(),cell.getValueLength()));
			
		}
		
		table.close();
		conn.close();
		
	}
	
	
	/**
	 * 按行鍵範圍查詢資料
	 * @throws Exception 
	 */
	@Test
	public void testScan() throws Exception{
		
		Table table = conn.getTable(TableName.valueOf("user_info"));
		
		// 包含起始行鍵，不包含結束行鍵,但是如果真的想查詢出末尾的那個行鍵，那麼，可以在末尾行鍵上拼接一個不可見的位元組（\000）
		Scan scan = new Scan("10".getBytes(), "10000\001".getBytes());
		
		ResultScanner scanner = table.getScanner(scan);
		
		Iterator<Result> iterator = scanner.iterator();
		
		while(iterator.hasNext()){
			
			Result result = iterator.next();
			// 周遊整行結果中的所有kv單元格
			CellScanner cellScanner = result.cellScanner();
			while(cellScanner.advance()){
				Cell cell = cellScanner.current();
				
				byte[] rowArray = cell.getRowArray();  //本kv所屬的行鍵的位元組數組
				byte[] familyArray = cell.getFamilyArray();  //列族名的位元組數組
				byte[] qualifierArray = cell.getQualifierArray();  //列名的位元組資料
				byte[] valueArray = cell.getValueArray(); // value的位元組數組
				
				System.out.println("行鍵: "+new String(rowArray,cell.getRowOffset(),cell.getRowLength()));
				System.out.println("列族名: "+new String(familyArray,cell.getFamilyOffset(),cell.getFamilyLength()));
				System.out.println("列名: "+new String(qualifierArray,cell.getQualifierOffset(),cell.getQualifierLength()));
				System.out.println("value: "+new String(valueArray,cell.getValueOffset(),cell.getValueLength()));
			}
			System.out.println("----------------------");
		}
	}
	
	@Test
	public void test(){
		String a = "000";
		String b = "000\0";
		
		System.out.println(a);
		System.out.println(b);
		
		
		byte[] bytes = a.getBytes();
		byte[] bytes2 = b.getBytes();
		
		System.out.println("");
		
	}

}
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