标签:hbase
Java Client API Overview
HBase是用Java写的,支持用编程语言来动态操作管理数据库,能用命令行做的都可以用API来做。
基本的使用过程如下:
1.创建一个 Configuration 对象
–从 HDFS 对象中调用 Configuration
–添加 HBase 属性
Configuration conf = HbaseConfiguration.create();
2.创建 HTable
–提供 Configuration 对象
–提供 表名
HTable hTable = new HTable(conf, tableName);
3.执行操作
–如 put, get, scan, delete, etc...
hTable.getTableName();
4.关闭 HTable 实例
–清空缓存
–释放资源
hTable.close();
下面是一个建表的例子:
import java.io.IOException; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.hbase.HBaseConfiguration; import org.apache.hadoop.hbase.client.HTable; import org.apache.hadoop.hbase.util.Bytes; public class ConstructHTable { public static void main(String[] args) throws IOException { Configuration conf = HBaseConfiguration.create(); HTable htable = new HTable(conf,"table-created_from_api"); System.out.println("Table :"+Bytes.toString(htable.getTableName())); htable.close(); } }
import java.io.IOException; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.hbase.HBaseConfiguration; import org.apache.hadoop.hbase.client.HTable; import org.apache.hadoop.hbase.client.Put; import static org.apache.hadoop.hbase.util.Bytes.*; public class PutExample { public static void main(String[] args) throws IOException { Configuration conf = HBaseConfiguration.create(); HTable hTable = new HTable(conf, "HBaseSamples"); Put put1 = new Put(toBytes("row1")); put1.add(toBytes("test"), toBytes("col1"), toBytes("val1")); put1.add(toBytes("test"), toBytes("col2"), toBytes("val2")); hTable.put(put1); hTable.close(); } }
标签:hbase
原文地址:http://blog.csdn.net/laozhaokun/article/details/24650479