HBase-各种API操作

初始化 

Configuration HBASE_CONFIG = new Configuration();
HBASE_CONFIG.set("hbase.zookeeper.quorum", "IP");
HBASE_CONFIG.set("hbase.zookeeper.property.clientPort", "端口");
cfg = new HBaseConfiguration(HBASE_CONFIG);
cfg.set("hbase.master", "master ip:60000");

创建表 

public void createTable(String tablename) throws IOException {
    HBaseAdmin admin = new HBaseAdmin(cfg);
    if (admin.tableExists(tablename)) {
        System.out.println("Exists!!!");
    } else {
        HTableDescriptor tableDesc = new HTableDescriptor(tablename);
        tableDesc.addFamily(new HColumnDescriptor("name"));
        admin.createTable(tableDesc);
        System.out.println("create table ok .");
    }
}

查询表的所有数据 

public void getAll(String tablename) throws IOException {
    HTable table = new HTable(cfg, tablename);
    Scan s = new Scan();
    ResultScanner rs = table.getScanner(s);
    for (Result r : rs) {
        KeyValue[] kv = r.raw();
        for (int i = 0; i < kv.length; i++) {
            System.out.print(new String(kv[i].getRow()) + "\t");
            System.out.print("column=" + new String(kv[i].getFamily())+ ":");
            System.out.print(new String(kv[i].getQualifier()) + ", ");
            System.out.print("timestamp=" + kv[i].getTimestamp() + ", ");
            System.out.println("value=" + new String(kv[i].getValue()));
        }
    }
}

查询一条数据 

public void get(String tablename, String rowKey) throws IOException {
    HTable table = new HTable(cfg, tablename);
    Get g = new Get(rowKey.getBytes());
    Result rs = table.get(g);
    for (KeyValue kv : rs.raw()) {
        System.out.print(new String(kv.getRow()) + ":");
        System.out.print("column=" + new String(kv.getFamily()) + ":");
        System.out.print(new String(kv.getQualifier()) + ", ");
        System.out.print("timestamp=" + kv.getTimestamp() + ", ");
        System.out.println("value=" + new String(kv.getValue()));
    }
}

更新数据 

public void update(String tablename,String rowKey,String value) throws IOException {
    HTable table = new HTable(cfg, tablename);
    Put put = new Put(Bytes.toBytes(rowKey));
    put.add(Bytes.toBytes("name"), Bytes.toBytes("column"),Bytes.toBytes(value));
    table.put(put);
}

删除一条数据(也可以删除多条) 

public void delete(String tablename, String rowKey) throws IOException {
    HTable table = new HTable(cfg, tablename);
    List list = new ArrayList();
    Delete d1 = new Delete(rowKey.getBytes());
    list.add(d1);
    table.delete(list);
}

查询多条 

public void multiGet(String tablename,String[] keys) throws IOException {
    HTable table = new HTable(cfg, tablename);
    List list = new ArrayList();
    for(String k:keys) {
        Get g = new Get(k.getBytes());
        list.add(g);
    }
    Result[] rs = table.get(list);
       }

删除表 

public void removeTable(String tablename) throws IOException {
    HBaseAdmin admin = new HBaseAdmin(cfg);
    admin.disableTable(tablename);
    admin.deleteTable(tablename);
}

增加过滤器 

public void filter(String tablename, String key,int count) throws IOException {
    HTable table = new HTable(cfg, tablename);
    Scan s = new Scan();
    List list = new ArrayList();
    list.add(new PrefixFilter(key.getBytes()));
    list.add(new PageFilter(count));
    FilterList filter = new FilterList(list);
    s.setFilter(filter);
    ResultScanner rs = table.getScanner(s);
        }