hbase scan 的例子

Posted 2020-06-13

/**
 * Created by han on 2016/1/28.
 */
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.*;
import org.apache.hadoop.hbase.client.*;
import org.apache.hadoop.hbase.filter.CompareFilter.CompareOp;
import org.apache.hadoop.hbase.filter.Filter;
import org.apache.hadoop.hbase.filter.FilterList;
import org.apache.hadoop.hbase.filter.SingleColumnValueFilter;
import org.apache.hadoop.hbase.util.Bytes;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class test {

    public static Configuration configuration;
    static {
        configuration = HBaseConfiguration.create();
        configuration.set("hbase.zookeeper.property.clientPort", "2181");
        configuration.set("hbase.zookeeper.quorum", "48.0.191.154:2181,48.0.191.154:2182,48.0.191.154:2183");
        configuration.set("hbase.master", "48.0.191.154:60000");
        System.setProperty("java.library.path","E:\\资料\\hadoop-2.6.2\\bin");
        System.setProperty("hadoop.home.dir", "E:\\资料\\hadoop-2.6.2");
        System.setProperty("PATH", "E:\\资料\\hadoop-2.6.2\\bin");

    }

    public static void main(String[] args) {
      //   createTable("h");
      //   insertData("h");
     //   QueryAll("h");
   //     QueryByCondition1("h");
       QueryByCondition2("h");
    //   QueryByCondition3("h");
      //  deleteRow("h","abcdef");
      //  deleteByCondition("h","abcdef");
      //  dropTable("h");
    }

    /**
     * 创建表
     * @param tableName
     */
    public static void createTable(String tableName) {
        System.out.println("start create table ......");
        try {
            HBaseAdmin hBaseAdmin = new HBaseAdmin(configuration);
            if (hBaseAdmin.tableExists(tableName)) {// 如果存在要创建的表，那么先删除，再创建
                hBaseAdmin.disableTable(tableName);
                hBaseAdmin.deleteTable(tableName);
                System.out.println(tableName + " is exist,detele....");
            }
            HTableDescriptor tableDescriptor = new HTableDescriptor(tableName);
            tableDescriptor.addFamily(new HColumnDescriptor("column1"));
            tableDescriptor.addFamily(new HColumnDescriptor("column2"));
            tableDescriptor.addFamily(new HColumnDescriptor("column3"));
            tableDescriptor.addFamily(new HColumnDescriptor("cf"));
            hBaseAdmin.createTable(tableDescriptor);
        } catch (MasterNotRunningException e) {
            e.printStackTrace();
        } catch (ZooKeeperConnectionException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        System.out.println("end create table ......");
    }

    /**
     * 插入数据
     * @param tableName
     */
    public static void insertData(String tableName) {
        System.out.println("start insert data ......");
        HTablePool pool = new HTablePool(configuration, 1000);
        HTableInterface table =   pool.getTable(tableName);
        Put put = new Put("abcdef".getBytes());// 一个PUT代表一行数据，再NEW一个PUT表示第二行数据,每行一个唯一的ROWKEY，此处rowkey为put构造方法中传入的值
        put.add("column1".getBytes(), null, "aaa".getBytes());// 本行数据的第一列
        put.add("column2".getBytes(), null, "bbb".getBytes());// 本行数据的第三列
        put.add("column3".getBytes(), null, "ccc".getBytes());// 本行数据的第三列
        Put put1 = new Put("han_r1".getBytes());
        put1.addColumn("cf".getBytes(),"a".getBytes(),"han_cf_a".getBytes());

        try {
            table.put(put);
            table.put(put1);
        } catch (IOException e) {
            e.printStackTrace();
        }
        System.out.println("end insert data ......");
    }

    /**
     * 删除一张表
     * @param tableName
     */
    public static void dropTable(String tableName) {
        try {
            HBaseAdmin admin = new HBaseAdmin(configuration);
            admin.disableTable(tableName);
            admin.deleteTable(tableName);
        } catch (MasterNotRunningException e) {
            e.printStackTrace();
        } catch (ZooKeeperConnectionException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
    /**
     * 根据 rowkey删除一条记录
     * @param tablename
     * @param rowkey
     */
    public static void deleteRow(String tablename, String rowkey)  {
        try {
            HTable table = new HTable(configuration, tablename);
            List list = new ArrayList();
            Delete d1 = new Delete(rowkey.getBytes());
            list.add(d1);

            table.delete(list);
            System.out.println("删除行成功!");

        } catch (IOException e) {
            e.printStackTrace();
        }


    }

    /**
     * 组合条件删除
     * @param tablename
     * @param rowkey
     */
    public static void deleteByCondition(String tablename, String rowkey)  {
        //目前还没有发现有效的API能够实现 根据非rowkey的条件删除 这个功能能，还有清空表全部数据的API操作

    }


    /**
     * 查询所有数据
     * @param tableName
     */
    public static void QueryAll(String tableName) {
        HTablePool pool = new HTablePool(configuration, 1000);
        HTableInterface  table =  pool.getTable(tableName);
        try {
            ResultScanner rs = table.getScanner(new Scan());
            for (Result r : rs) {
                System.out.println("获得到rowkey:" + new String(r.getRow()));
                for (KeyValue keyValue : r.raw()) {
                    System.out.println("列：" + new String(keyValue.getFamily())
                                    +
                                    " ：" + new String(keyValue.getQualifier())
                                    + "====值:" + new String(keyValue.getValue())
                                    + "===TIME===" + String.valueOf(keyValue.getTimestamp() )

                    );
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 单条件查询,根据rowkey查询唯一一条记录
     * @param tableName
     */
    public static void QueryByCondition1(String tableName) {
        System.out.println(" QueryByCondition1");
        HTablePool pool = new HTablePool(configuration, 1000);
        HTableInterface  table =   pool.getTable(tableName);
        try {
            Get scan = new Get("abcdef".getBytes());// 根据rowkey查询
            Result r = table.get(scan);
            System.out.println("获得到rowkey:" + new String(r.getRow()));
            for (KeyValue keyValue : r.raw()) {
                System.out.println("列：" + new String(keyValue.getFamily())
                                +
                                " ：" + new String(keyValue.getQualifier())
                                + "====值:" + new String(keyValue.getValue())
                                + "===TIME===" + String.valueOf(keyValue.getTimestamp() )

                );
            }

        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 单条件按查询，查询多条记录
     * @param tableName
     */
    public static void QueryByCondition2(String tableName) {
        System.out.println(" QueryByCondition2");
        try {
            HTablePool pool = new HTablePool(configuration, 1000);
            HTableInterface  table =   pool.getTable(tableName);
            FilterList filterList=new FilterList();
            SingleColumnValueFilter filter = new SingleColumnValueFilter(Bytes
                    .toBytes("column1"), null, CompareOp.EQUAL, Bytes
                    .toBytes("aaa") ); // 当列column1的值为aaa时进行查询
             filter.setFilterIfMissing(true);
            filterList.addFilter(filter);
            Scan s = new Scan();
            s.setFilter(filterList);
            ResultScanner rs = table.getScanner(s);
            for (Result r : rs) {
                System.out.println("获得到rowkey:" + new String(r.getRow()));
                for (KeyValue keyValue : r.raw()) {
                    System.out.println("列：" + new String(keyValue.getFamily())
                            +
                            " ：" + new String(keyValue.getQualifier())
                            + "====值:" + new String(keyValue.getValue())
                            + "===TIME===" + String.valueOf(keyValue.getTimestamp())

                     );
                }
            }
            rs.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

    /**
     * 组合条件查询
     * @param tableName
     */
    public static void QueryByCondition3(String tableName) {
        System.out.println(" QueryByCondition3");
        try {
            HTablePool pool = new HTablePool(configuration, 1000);
            HTableInterface  table =   pool.getTable(tableName);

            List<Filter> filters = new ArrayList<Filter>();

            Filter filter1 = new SingleColumnValueFilter(Bytes
                    .toBytes("column1"), null, CompareOp.EQUAL, Bytes
                    .toBytes("aaa"));
            filters.add(filter1);

            Filter filter2 = new SingleColumnValueFilter(Bytes
                    .toBytes("column2"), null, CompareOp.EQUAL, Bytes
                    .toBytes("bbb"));
            filters.add(filter2);

            Filter filter3 = new SingleColumnValueFilter(Bytes
                    .toBytes("column3"), null, CompareOp.EQUAL, Bytes
                    .toBytes("ccc"));
            filters.add(filter3);

            FilterList filterList1 = new FilterList(filters);

            Scan scan = new Scan();
            scan.setFilter(filterList1);
            ResultScanner rs = table.getScanner(scan);
            for (Result r : rs) {
                System.out.println("获得到rowkey:" + new String(r.getRow()));
                for (KeyValue keyValue : r.raw()) {
                    System.out.println("列：" + new String(keyValue.getFamily())
                                    +
                                    " ：" + new String(keyValue.getQualifier())
                                    + "====值:" + new String(keyValue.getValue())
                                    + "===TIME===" + String.valueOf(keyValue.getTimestamp())

                    );
                }
            }
            rs.close();

        } catch (Exception e) {
            e.printStackTrace();
        }

    }

}

View Code

根据 SingleColumnValueFilter 按照列和值查询,会把没有该列的行查询出来,加入

filter.setFilterIfMissing(true);
就可以了