java实现Hbase 增删改查

目录

一、新建一个maven工程

 二、代码实现

2.1、配置hbase信息，连接hbase数据库

2.2、创建命名空间

2.3、创建表

2.4、删除表，删除之前要设置为禁用状态

2.5、添加数据

2.6、获取命令表空间 / tables列表

2.7、get方法查看表的内容

2.8、scan方法查看表的内容

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一、新建一个maven工程

 添加 pom依赖

  
      org.apache.hbase
      hbase-client
      2.3.5
    
    
      org.apache.hbase
      hbase-server
      2.3.5
    

 二、代码实现

2.1、配置hbase信息，连接hbase数据库

1.、测试类添加@Before 和@After  便于初始化和关闭资源

2、将对象提到上面，变为全局对象

    static Configuration config = null;
    private Connection conn = null;
    private Admin admin = null;

    @Before
    public void init() throws IOException {
        System.out.println("执行init()方法");
        config = HBaseConfiguration.create();
        config.set(HConstants.HBASE_DIR, "hdfs://192.168.91.180:9000/hbase");
        config.set(HConstants.ZOOKEEPER_QUORUM, "192.168.91.180");
        config.set(HConstants.CLIENT_PORT_STR, "2181");
        conn = ConnectionFactory.createConnection(config);
        admin = conn.getAdmin();
    }


   @After
    public void close() throws IOException {
        System.out.println("执行close()方法");
        if (admin != null)
            admin.close();
        if (conn != null)
            conn.close();

    }

2.2、创建命名空间

    @Test
    public void createNameSpace() throws IOException {
        NamespaceDescriptor kb21 = NamespaceDescriptor.create("kb21").build();
        try {
            admin.createNamespace(kb21);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

2.3、创建表

    @Test
    public void createTable() throws IOException {
        //创建表的描述类
        TableName tableName = TableName.valueOf("kb21:student");
        HTableDescriptor desc = new HTableDescriptor(tableName);

        //创建列族的描述类
        HColumnDescriptor family1 = new HColumnDescriptor("info1");
        HColumnDescriptor family2 = new HColumnDescriptor("info2");
        desc.addFamily(family1);
        desc.addFamily(family2);

        admin.createTable(desc);
    }

2.4、删除表，删除之前要设置为禁用状态

   @Test
    public void deleteTable() throws IOException {
        admin.disableTable(TableName.valueOf("kb21:student"));
        admin.deleteTable(TableName.valueOf("kb21:student"));

    }

2.5、添加数据

    @Test
    public void insertData() throws IOException {
        Table table = conn.getTable(TableName.valueOf("kb21:student"));

        Put put = new Put(Bytes.toBytes("student1"));
        put.addColumn("info1".getBytes(),"name".getBytes(),"zs".getBytes());
        put.addColumn("info2".getBytes(),"school".getBytes(),"njzb".getBytes());

        Put put2 = new Put(Bytes.toBytes("student2"));
        put2.addColumn("info1".getBytes(),"name".getBytes(),"zss".getBytes());
        put2.addColumn("info2".getBytes(),"school".getBytes(),"njzb".getBytes());

        Put put3 = new Put(Bytes.toBytes("student3"));
        put3.addColumn("info1".getBytes(),"name".getBytes(),"zsr".getBytes());
        put3.addColumn("info2".getBytes(),"school".getBytes(),"njzb".getBytes());

        ArrayList list = new ArrayList<>();

        list.add(put2);
        list.add(put3);
        table.put(list);
    }

2.6、获取命令表空间 / tables列表

   @Test
    public void getAllNameSpace() throws IOException {
        String[] nps = admin.listNamespaces();
        String s = Arrays.toString(nps);
        System.out.println(s);
        //获得表的列族
        List tableDesc = admin.listTableDescriptorsByNamespace("kb21".getBytes());
        System.out.println(tableDesc.toString());
    }

2.7、get方法查看表的内容

    @Test
    public void queryData() throws IOException {
        Table table = conn.getTable(TableName.valueOf("kb21:student"));
        Get get = new Get(Bytes.toBytes("student1"));
        Result result = table.get(get);
        byte[] value = result.getValue(Bytes.toBytes("info1"), Bytes.toBytes("name"));
        System.out.println("姓名：" + Bytes.toString(value));
        value = result.getValue(Bytes.toBytes("info2"), Bytes.toBytes("school"));
        System.out.println("学校：" + Bytes.toString(value));
    }

2.8、scan方法查看表的内容

    @Test
    public void scanData() throws IOException {
        Table table = conn.getTable(TableName.valueOf("kb21:student"));
        Scan scan = new Scan();
        ResultScanner scanner = table.getScanner(scan);
        for (Result result: scanner
             ) {
            byte[] value = result.getValue(Bytes.toBytes("info1"), Bytes.toBytes("name"));
            System.out.println("姓名：" + Bytes.toString(value));
            value = result.getValue(Bytes.toBytes("info2"), Bytes.toBytes("school"));
            System.out.println("学校：" + Bytes.toString(value));
            System.out.println(Bytes.toString(result.getRow()));
        }
    }