HBase API（Java版）

╰+哭是因爲堅強的太久メ 2023-10-04 16:42 93阅读 0赞

### HBase API ###

新建maven项目，添加依赖

<dependency> 
        <groupId>org.apache.hbase</groupId> 
        <artifactId>hbase-server</artifactId> 
        <version>1.3.1</version> 
    </dependency> 
     
    <dependency> 
        <groupId>org.apache.hbase</groupId> 
        <artifactId>hbase-client</artifactId> 
        <version>1.3.1</version> 
    </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("hbase.zookeeper.quorum", "192.166.9.102"); 
        conf.set("hbase.zookeeper.property.clientPort", "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  = ConnectionFactory.createConnection(conf); 
    	//HBaseAdmin admin = (HBaseAdmin) connection.getAdmin(); 
      	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"); 
           //System.exit(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)); 
          //get.setMaxVersions();显示所有版本 
          //get.setTimeStamp();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))); 
              } 
    }