大数据之Hbase的API操作

package com.bw;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.*;
import org.apache.hadoop.hbase.client.*;
import org.apache.hadoop.hbase.filter.CompareFilter;
import org.apache.hadoop.hbase.filter.SingleColumnValueFilter;
import org.apache.hadoop.hbase.util.Bytes;
import java.io.IOException;

public class HbaseTest {

      /*
        4. 查看user_info表结构（若无user_info表先创建user_info表，包含info、data两个列族）。
        5. 向user_info表中插入如下信息：
        row key为rk0001，info:name值为zhangsan，info:age值为18；data:math值为80，data:computer值为90
        row key为rk0002，info:name值为lisi，info:age值为19；data:math值为70，data:computer值为90
        6. 查询user_info表中行键为rk0002的记录。
        7. 查询user_info表中info:name为zhangsan的记录。
        8. 查询user_info表中info:age大于等于18的记录。
        9. 删除user_info中行键为rk0001的记录。*/

    private static Connection connection = null;

    static {

        Configuration configuration = HBaseConfiguration.create();

        configuration.set("hbase.zookeeper.quorum","hadoop1,hadoop2,hadoop3");
        configuration.set("hbase.zookeeper.property.client","2181");

        try {
            connection = ConnectionFactory.createConnection(configuration);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    //删除表
    private static void deleteTable(String tableName) throws IOException {
        Admin admin = connection.getAdmin();

        try {
            if(!admin.tableExists(TableName.valueOf(tableName))){
                return;
            }
            admin.disableTable(TableName.valueOf(tableName));
            admin.deleteTable(TableName.valueOf(tableName));
        }finally {
            admin.close();
        }
    }

    //建表
    private static void createTable(String tableName,String... family) throws IOException {
        Admin admin = connection.getAdmin();

        try {
            if(admin.tableExists(TableName.valueOf(tableName))){
                return;
            }
            HTableDescriptor hTableDescriptor = new HTableDescriptor(TableName.valueOf(tableName));

            for (String s : family) {
                HColumnDescriptor hColumnDescriptor = new HColumnDescriptor(s);
                hTableDescriptor.addFamily(hColumnDescriptor);
            }
            admin.createTable(hTableDescriptor);
        }finally {
            admin.close();
        }
    }

    //插入数据
    private static void putCells(String tableName,String rowkey,String family,String column,String value) throws IOException {
        Table table = connection.getTable(TableName.valueOf(tableName));
        Admin admin = connection.getAdmin();
        try {
            if(!admin.tableExists(TableName.valueOf(tableName))){
                return;
            }
            Put put = new Put(Bytes.toBytes(rowkey));
            put.addColumn(Bytes.toBytes(family),Bytes.toBytes(column),Bytes.toBytes(value));
            table.put(put);
        }finally {
            table.close();
        }
    }

    //查询数据
    private static void getCell(String tableName,String rowkey) throws IOException {
        Table table = connection.getTable(TableName.valueOf(tableName));
        try {
            Get get = new Get(Bytes.toBytes(rowkey));
            Result result = table.get(get);
            for (Cell cell : result.rawCells()) {
                byte[] columnBytes = CellUtil.cloneQualifier(cell);
                String columnStr = Bytes.toString(columnBytes);
                //获取值
                String valueStr = Bytes.toString(CellUtil.cloneValue(cell));

                System.out.println(columnStr + " : " + valueStr);
            }

        }finally {
            table.close();
        }
    }

    //过滤  查询user_info表中info:name为zhangsan的记录。
    private static void filterColumnValue(String tableName,String family,String column,String value) throws IOException {
        Table table = connection.getTable(TableName.valueOf(tableName));
        try {
            //2
            Scan scan = new Scan(Bytes.toBytes(family));
            //4
                    SingleColumnValueFilter filter = new SingleColumnValueFilter(Bytes.toBytes(family), Bytes.toBytes(column), CompareFilter.CompareOp.GREATER_OR_EQUAL, Bytes.toBytes(value));
            //3
            scan.setFilter(filter);
            //1去执行scan操作方法
            ResultScanner scanner = table.getScanner(scan);
            //先循环行,然后通过行循环列
            for (Result result : scanner) {
                for (Cell cell : result.rawCells()) {
                    String rowStr = Bytes.toString(CellUtil.cloneRow(cell));
                    String familyStr = Bytes.toString(CellUtil.cloneFamily(cell));
                    String columnStr = Bytes.toString(CellUtil.cloneQualifier(cell));
                    String valueStr = Bytes.toString(CellUtil.cloneValue(cell));

                    System.out.println(rowStr + " : " + familyStr + " : " + columnStr + " : " + valueStr);
                }
            }
        }finally {
            table.close();
        }
    }

    //删除某一行记录
    private static void deleteRow(String tableName,String rowkey) throws IOException {
        Table table = connection.getTable(TableName.valueOf(tableName));
        try {
            Delete delete = new Delete(Bytes.toBytes(rowkey));

            table.delete(delete);
        }finally {
            table.close();
        }
    }
    //查询所有
    public  static  void scans(String tableName) throws IOException {
        Table table = connection.getTable(TableName.valueOf(tableName));

        Scan scan = new Scan();

        ResultScanner scanner = table.getScanner(scan);
        for (Result result : scanner) {
            for (Cell cell : result.rawCells()) {
                String row = Bytes.toString(CellUtil.cloneRow(cell));
                String family = Bytes.toString(CellUtil.cloneFamily(cell));
                String column = Bytes.toString(CellUtil.cloneQualifier(cell));
                String value = Bytes.toString(CellUtil.cloneValue(cell));
                System.out.println(row+"-"+family+"-"+column+"-"+value);
            }
        }
        table.close();
    }

    public static void main(String[] args) throws IOException {
        //删除表
      // deleteTable("user_info");
       // deleteTable("employee");
      //  deleteTable("student");
        //建表
       //createTable("user_info","info","data");
      //  createTable("Score","sname","course");
        //插入数据
       /* row key为rk0001，info:name值为zhangsan，info:age值为18；data:math值为80，data:computer值为90
        row key为rk0002，info:name值为lisi，info:age值为19；data:math值为70，data:computer值为90*/
       /* putCells("user_info","rk0001","info","name","zhangsan");
        putCells("user_info","rk0001","info","age","18");
        putCells("user_info","rk0001","data","math","80");
        putCells("user_info","rk0001","data","computer","90");
        putCells("user_info","rk0002","info","name","lisi");
        putCells("user_info","rk0002","info","age","19");
        putCells("user_info","rk0002","data","math","70");
        putCells("user_info","rk0002","data","computer","90");
        */
      //  putCells("Score","95001","course","Math","88");
       // putCells("Score","95001","course","English","85");
        //根据rowkey获取数据
       // getCell("user_info","rk0002");

        //查询user_info表中info:name为zhangsan的记录。
      //  filterColumnValue("user_info","info","name","zhangsan");
       // filterColumnValue("user_info","data","math","80");
        //删除user_info中行键为rk0001的记录
    //  deleteRow("user_info","rk0001");

      //  scans("user_info");


    }


}