lmy86263/orm-hbase

an ORM framework for operating hbase easily

orm-hbase

an ORM framework for operating hbase easily. It worked like Hibernate,you can just include the jar and annotate your PO(persistent object),it will works well.

some features:

1. annotate the PO with @Table/@Column/@RowKey, it can automatically mapping your hbase table
2. supply CRUD function:create,research,update,delete
3. supply aggregator function:sum,count (need config org.apache.hadoop.hbase.coprocessor.AggregateImplementation coprocessor in hbase)
4. supply query data by page(pagination)
5. supply Criteria style to operate hbase like hibernate Criteria

one word,you can use HBase like use hibernate.

Demo:

only 2 steps to master this framwork

1.just annotate the @Table,@RowKey,@Column in your pojo

 @Table(name = "user")</br>
 public class User {

  @RowKey
  private int id;

  @Column(family = "info")
  private int userId;

  @Column(family = "info", name = "user_name1")
  private String userName;

  @Column(family = "info")
  private long age;

}

2.use HBaseColumnarClient instance to handle the po,like below code

  HBaseColumnarClient client = new HBaseColumnarClient(scanCaching, scanBatch);
  DataSourceConfig config = new DataSourceConfig("hbase.properties");
  HBaseSource source = new HBaseSource(config.getProperties());
  client.setHBaseSource(source);
  client.putObject(user);

3.Criteria style to operat hbase like hibernate criteria

  // count the data
  Filter[] filters = null;
  long count =
               Criteria.aggregate(User.class).fromRow(startRow).toRow(endRow)
                               .filters(filters).build().count(client);
                               
  // sum the column value
  long sum =
               Criteria.aggregate(User.class).fromRow(startRow).toRow(endRow)
                               .filters(filters).propertyName("age").build().sum(client);
                               
   // query by rowKey
             User queryUser =
                         Criteria.find(User.class).byRowKey(Bytes.toBytes(id)).build().query(client);
                    
   // query from startRow to endRow
  List<User> queryList =
               Criteria.find(User.class).fromRow(startRow).toRow(endRow).build()
                               .queryList(client);
                               
  // query by page
  PageBean<User> pageBean = new PageBean<User>() {};
  pageBean.setPageSize(10);
  pageBean.setStartRow(startRow);
  pageBean.setStopRow(endRow);
  PageBean<User> queryPage =
               Criteria.find(User.class).pageBean(pageBean).build().queryPage(client);
               
  // delete data
  byte[] rowKey = Bytes.toBytes(id);
  Criteria.delete(User.class).byRowKey(rowKey).build().excute(client);