Hbase 安装--7. 例子 PutExample

package Hbase_Master;

 

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 org.apache.hadoop.hbase.util.Bytes;

import java.io.IOException;

 

 

 

public class PutExample

{

public static void main(String[] args)throws IOException

{

Configuration conf= HBaseConfiguration.create(); //创建配置文件

 

HTable table=new HTable(conf, "testtable");  //创建 table

 

Put put= new Put(Bytes.toBytes("row1"));   //创建 put实例，行key

 

put.add(Bytes.toBytes("colfam1"), Bytes.toBytes("qual1"), Bytes.toBytes("val1")); //添加  colfam1:qual1

put.add(Bytes.toBytes("colfam1"), Bytes.toBytes("qual2"), Bytes.toBytes("val2")); //添加 colfam1:qual2

 

table.put(put);

 

}

 

}

package util;

 

import org.apache.hadoop.conf.Configuration;

import org.apache.hadoop.hbase.HColumnDescriptor;

import org.apache.hadoop.hbase.HTableDescriptor;

import org.apache.hadoop.hbase.KeyValue;

import org.apache.hadoop.hbase.client.Get;

import org.apache.hadoop.hbase.client.HBaseAdmin;

import org.apache.hadoop.hbase.client.HTable;

import org.apache.hadoop.hbase.client.Put;

import org.apache.hadoop.hbase.client.Result;

import org.apache.hadoop.hbase.util.Bytes;

 

import java.io.IOException;

import java.util.ArrayList;

import java.util.List;

import java.util.Random;

 

/**

 * Used by the book examples to generate tables and fill them with test data.

 */

public class HBaseHelper {

 

  private Configuration conf = null;

  private HBaseAdmin admin = null;

 

  protected HBaseHelper(Configuration conf) throws IOException {

    this.conf = conf;

    this.admin = new HBaseAdmin(conf);

  }

 

  public static HBaseHelper getHelper(Configuration conf) throws IOException {

    return new HBaseHelper(conf);

  }

 

  public boolean existsTable(String table)

  throws IOException {

    return admin.tableExists(table);

  }

 

  public void createTable(String table, String... colfams)

  throws IOException {

    createTable(table, null, colfams);

  }

 

  public void createTable(String table, byte[][] splitKeys, String... colfams)

  throws IOException {

    HTableDescriptor desc = new HTableDescriptor(table);

    for (String cf : colfams) {

      HColumnDescriptor coldef = new HColumnDescriptor(cf);

      desc.addFamily(coldef);

    }

    if (splitKeys != null) {

      admin.createTable(desc, splitKeys);

    } else {

      admin.createTable(desc);

    }

  }

 

  public void disableTable(String table) throws IOException {

    admin.disableTable(table);

  }

 

  public void dropTable(String table) throws IOException {

    if (existsTable(table)) {

      disableTable(table);

      admin.deleteTable(table);

    }

  }

 

  public void fillTable(String table, int startRow, int endRow, int numCols,

                        String... colfams)

  throws IOException {

    fillTable(table, startRow, endRow, numCols, -1, false, colfams);

  }

 

  public void fillTable(String table, int startRow, int endRow, int numCols,

                        boolean setTimestamp, String... colfams)

  throws IOException {

    fillTable(table, startRow, endRow, numCols, -1, setTimestamp, colfams);

  }

 

  public void fillTable(String table, int startRow, int endRow, int numCols,

                        int pad, boolean setTimestamp, String... colfams)

  throws IOException {

    fillTable(table, startRow, endRow, numCols, pad, setTimestamp, false, colfams);

  }

 

  public void fillTable(String table, int startRow, int endRow, int numCols,

                        int pad, boolean setTimestamp, boolean random,

                        String... colfams)

  throws IOException {

    HTable tbl = new HTable(conf, table);

    Random rnd = new Random();

    for (int row = startRow; row <= endRow; row++) {

      for (int col = 0; col < numCols; col++) {

        Put put = new Put(Bytes.toBytes("row-" + padNum(row, pad)));

        for (String cf : colfams) {

          String colName = "col-" + padNum(col, pad);

          String val = "val-" + (random ?

            Integer.toString(rnd.nextInt(numCols)) :

            padNum(row, pad) + "." + padNum(col, pad));

          if (setTimestamp) {

            put.add(Bytes.toBytes(cf), Bytes.toBytes(colName),

              col, Bytes.toBytes(val));

          } else {

            put.add(Bytes.toBytes(cf), Bytes.toBytes(colName),

              Bytes.toBytes(val));

          }

        }

        tbl.put(put);

      }

    }

    tbl.close();

  }

 

  public String padNum(int num, int pad) {

    String res = Integer.toString(num);

    if (pad > 0) {

      while (res.length() < pad) {

        res = "0" + res;

      }

    }

    return res;

  }

 

  public void put(String table, String row, String fam, String qual,

                  String val) throws IOException {

    HTable tbl = new HTable(conf, table);

    Put put = new Put(Bytes.toBytes(row));

    put.add(Bytes.toBytes(fam), Bytes.toBytes(qual), Bytes.toBytes(val));

    tbl.put(put);

    tbl.close();

  }

 

  public void put(String table, String row, String fam, String qual, long ts,

                  String val) throws IOException {

    HTable tbl = new HTable(conf, table);

    Put put = new Put(Bytes.toBytes(row));

    put.add(Bytes.toBytes(fam), Bytes.toBytes(qual), ts,

            Bytes.toBytes(val));

    tbl.put(put);

    tbl.close();

  }

 

  public void put(String table, String[] rows, String[] fams, String[] quals,

                  long[] ts, String[] vals) throws IOException {

    HTable tbl = new HTable(conf, table);

    for (String row : rows) {

      Put put = new Put(Bytes.toBytes(row));

      for (String fam : fams) {

        int v = 0;

        for (String qual : quals) {

          String val = vals[v < vals.length ? v : vals.length - 1];

          long t = ts[v < ts.length ? v : ts.length - 1];

          put.add(Bytes.toBytes(fam), Bytes.toBytes(qual), t,

            Bytes.toBytes(val));

          v++;

        }

      }

      tbl.put(put);

    }

    tbl.close();

  }

 

  public void dump(String table, String[] rows, String[] fams, String[] quals)

  throws IOException {

    HTable tbl = new HTable(conf, table);

    List<Get> gets = new ArrayList<Get>();

    for (String row : rows) {

      Get get = new Get(Bytes.toBytes(row));

      get.setMaxVersions();

      if (fams != null) {

        for (String fam : fams) {

          for (String qual : quals) {

            get.addColumn(Bytes.toBytes(fam), Bytes.toBytes(qual));

          }

        }

      }

      gets.add(get);

    }

    Result[] results = tbl.get(gets);

    for (Result result : results) {

      for (KeyValue kv : result.raw()) {

        System.out.println("KV: " + kv +

          ", Value: " + Bytes.toString(kv.getValue()));

      }

    }

  }

}