HBase 详细API操作

环境准备

新建项目后在中添加依赖：

<dependency>
    <groupId></groupId>
    <artifactId>hbase-server</artifactId>
    <version>1.3.1</version>
</dependency>

<dependency>
    <groupId></groupId>
    <artifactId>hbase-client</artifactId>
    <version>1.3.1</version>
</dependency>

<dependency>
	<groupId></groupId>
	<artifactId></artifactId>
	<version>1.8</version>
	<scope>system</scope>
	<systemPath>${JAVA_HOME}/lib/</systemPath>
</dependency>

HBaseAPI

获取Configuration对象

public static Configuration conf;
static{
	//使用HBaseConfiguration的单例方法实例化
	conf = HBaseConfiguration.create();
conf.set("", "192.168.9.102");
conf.set("", "2181");
}

判断表是否存在

public static boolean isTableExist(String tableName) throws MasterNotRunningException,
 ZooKeeperConnectionException, IOException{
	//在HBase中管理、访问表需要先创建HBaseAdmin对象
//Connection connection = (conf);
//HBaseAdmin admin = (HBaseAdmin) ();
	HBaseAdmin admin = new HBaseAdmin(conf);
	return admin.tableExists(tableName);
}

创建表

public static void createTable(String tableName, String... columnFamily) throws
 MasterNotRunningException, ZooKeeperConnectionException, IOException{
	HBaseAdmin admin = new HBaseAdmin(conf);
	//判断表是否存在
	if(isTableExist(tableName)){
		System.out.println("表" + tableName + "已存在");
		//(0);
	}else{
		//创建表属性对象,表名需要转字节
		HTableDescriptor descriptor = new HTableDescriptor(TableName.valueOf(tableName));
		//创建多个列族
		for(String cf : columnFamily){
			descriptor.addFamily(new HColumnDescriptor(cf));
		}
		//根据对表的配置，创建表
		admin.createTable(descriptor);
		System.out.println("表" + tableName + "创建成功！");
	}
}

删除表

public static void dropTable(String tableName) throws MasterNotRunningException,
 ZooKeeperConnectionException, IOException{
	HBaseAdmin admin = new HBaseAdmin(conf);
	if(isTableExist(tableName)){
		admin.disableTable(tableName);
		admin.deleteTable(tableName);
		System.out.println("表" + tableName + "删除成功！");
	}else{
		System.out.println("表" + tableName + "不存在！");
	}
}

向表中插入数据

public static void addRowData(String tableName, String rowKey, String columnFamily, String
 column, String value) throws IOException{
	//创建HTable对象
	HTable hTable = new HTable(conf, tableName);
	//向表中插入数据
	Put put = new Put(Bytes.toBytes(rowKey));
	//向Put对象中组装数据
	put.add(Bytes.toBytes(columnFamily), Bytes.toBytes(column), Bytes.toBytes(value));
	hTable.put(put);
	hTable.close();
	System.out.println("插入数据成功");
}

删除多行数据

public static void deleteMultiRow(String tableName, String... rows) throws IOException{
	HTable hTable = new HTable(conf, tableName);
	List<Delete> deleteList = new ArrayList<Delete>();
	for(String row : rows){
		Delete delete = new Delete(Bytes.toBytes(row));
		deleteList.add(delete);
	}
	hTable.delete(deleteList);
	hTable.close();
}

获取所有数据

public static void getAllRows(String tableName) throws IOException{
	HTable hTable = new HTable(conf, tableName);
	//得到用于扫描region的对象
	Scan scan = new Scan();
	//使用HTable得到resultcanner实现类的对象
	ResultScanner resultScanner = hTable.getScanner(scan);
	for(Result result : resultScanner){
		Cell[] cells = result.rawCells();
		for(Cell cell : cells){
			//得到rowkey
			System.out.println("行键:" + Bytes.toString(CellUtil.cloneRow(cell)));
			//得到列族
			System.out.println("列族" + Bytes.toString(CellUtil.cloneFamily(cell)));
			System.out.println("列:" + Bytes.toString(CellUtil.cloneQualifier(cell)));
			System.out.println("值:" + Bytes.toString(CellUtil.cloneValue(cell)));
		}
	}
}

获取某一行数据

public static void getRow(String tableName, String rowKey) throws IOException{
	HTable table = new HTable(conf, tableName);
	Get get = new Get(Bytes.toBytes(rowKey));
	//();显示所有版本
    //();显示指定时间戳的版本
	Result result = table.get(get);
	for(Cell cell : result.rawCells()){
		System.out.println("行键:" + Bytes.toString(result.getRow()));
		System.out.println("列族" + Bytes.toString(CellUtil.cloneFamily(cell)));
		System.out.println("列:" + Bytes.toString(CellUtil.cloneQualifier(cell)));
		System.out.println("值:" + Bytes.toString(CellUtil.cloneValue(cell)));
		System.out.println("时间戳:" + cell.getTimestamp());
	}
}

获取某一行指定“列族:列”的数据

public static void getRowQualifier(String tableName, String rowKey, String family, String
 qualifier) throws IOException{
	HTable table = new HTable(conf, tableName);
	Get get = new Get(Bytes.toBytes(rowKey));
	get.addColumn(Bytes.toBytes(family), Bytes.toBytes(qualifier));
	Result result = table.get(get);
	for(Cell cell : result.rawCells()){
		System.out.println("行键:" + Bytes.toString(result.getRow()));
		System.out.println("列族" + Bytes.toString(CellUtil.cloneFamily(cell)));
		System.out.println("列:" + Bytes.toString(CellUtil.cloneQualifier(cell)));
		System.out.println("值:" + Bytes.toString(CellUtil.cloneValue(cell)));
	}
}

简书：/u/0278602aea1d
****：/u012387141