一、API使用

1、maven

    org.apache.hbase
    hbase-server
    1.3.1


    org.apache.hbase
    hbase-client
    1.3.1

2、代码

public class HBaseDemo {
    public static Configuration conf;
    public static Connection con = null;

    public static void main(String[] args) throws IOException {
        boolean t1 = isTableExist("t1");
        System.out.println(t1);
    }
    static {
        //1.获得配置文件对象
        Configuration conf = HBaseConfiguration.create();
        //设置配置参数
        conf.set("hbase.zookeeper.quorum", "node01,node02,node03");
        //2.建立连接
        try {
             con = ConnectionFactory.createConnection(conf);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /*
    判断表是否存在
     */
    public  static boolean isTableExist(String tableName) throws
            IOException {
        //在 HBase 中管理、访问表需要先创建 HBaseAdmin 对象
        Admin admin = con.getAdmin();
        return admin.tableExists(TableName.valueOf("t1"));
    }

    /**
     * 创建表
     */
    public static void createTable(String tableName, String...
            columnFamily) throws
            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！");
        }
    }


    /**
     * 刪除表
     */
    public static void dropTable(String tableName) throws
            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！");
        }
    }

    /**
     * 向表中插入數據
     */
    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 deleteList = new ArrayList();
        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
     **/
    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)).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)));
        }
    }
}

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