wiki:waue/2010/0204-01

範例一:新增Table

執行方法

測試用打包檔 tsmcHBase_100204.jar

$ /opt/hadoop/bin/hadoop jar tsmcHBase_100204.jar CreateTable

程式碼

package tsmc;

import java.io.IOException;

import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.HColumnDescriptor;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.client.HBaseAdmin;

public class CreateTable {
  public static void createHBaseTable(String tablename, String family)
      throws IOException {
    // HTableDescriptor contains the name of an HTable, and its column
    // families
    // HTableDescriptor 用來描述table的屬性
    HTableDescriptor htd = new HTableDescriptor(tablename);
    // HColumnDescriptor HColumnDescriptor contains information about a
    // column family such as the number of versions, compression settings,
    // etc.
    // HTableDescriptor 透過 add() 方法來加入Column family

    htd.addFamily(new HColumnDescriptor(family));

    // HBaseConfiguration 能接收 hbase-site.xml 的設定值
    HBaseConfiguration config = new HBaseConfiguration();
    // 檔案的操作則使用 HBaseAdmin
    HBaseAdmin admin = new HBaseAdmin(config);
    // 檢查
    if (admin.tableExists(tablename)) {
      System.out.println("Table: " + tablename + "Existed.");
    } else {
      System.out.println("create new table: " + tablename);
      // 建立
      admin.createTable(htd);
    }
  }

  static public void main(String argv[]) throws IOException {

    String tablename = "tsmc";
    String family = "Detail";

    System.out.println("1. create table :" + tablename);

    createHBaseTable(tablename, family);
  }
}

Last modified 11 years ago Last modified on Feb 5, 2010, 12:00:04 AM