hbaseAPI

package com.atguigu.test;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.*;
import org.apache.hadoop.hbase.client.*;
import org.apache.hadoop.hbase.util.Bytes;

import java.io.IOException;

public class TestAPI {
    private static Admin admin = null;
    private static Connection conn = null;

    static {
        //获取配置hbase文件信息
//        HbaseConfiguration conf = new HbaseConfiguration();
        Configuration conf = HbaseConfiguration.create();
        conf.set("hbase.zookeeper.quorum", "hadoop01,hadoop02,hadoop03");
        //获取管理员对象
//        HbaseAdmin admin = new HbaseAdmin(conf);
        try {
            conn = ConnectionFactory.createConnection(conf);
            admin = conn.getAdmin();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    //关流
    public static void close() throws IOException {
        if (admin != null) {
            admin.close();
        }
        if (conn != null) {
            conn.close();
        }
    }

    //判断表是否存在
    public static boolean tableExists(String tableName) throws IOException {
        boolean result = admin.tableExists(TableName.valueOf(tableName));

        return result;
    }

    //创建表
    public static void createTable(String tableName, String... cfs) throws IOException {
        //判断列族是否存在
        if (cfs.length <= 0) {
            System.out.println("请设置列族信息");
            return;
        }
        //判断表是否存在
        if (tableExists(tableName)) {
            System.out.println(tableName + " 表已存在");
            return;
        }
        //创建表描述器
        HTableDescriptor hTableDescriptor = new HTableDescriptor(TableName.valueOf(tableName));
        //循环添加列族信息
        for (String cf : cfs) {
            //创建列族描述器
            HColumnDescriptor hColumnDescriptor = new HColumnDescriptor(cf);
            //指定版本数
//            hColumnDescriptor.setMaxVersions(1);
            //添加列族
            hTableDescriptor.addFamily(hColumnDescriptor);
        }
        //创建表
        admin.createTable(hTableDescriptor);
    }

    //删除表
    public static void deleteTable(String tableName) throws IOException {
        //判断表是否存在
        if (!tableExists(tableName)) {
            System.out.println(tableName + " 表不存在");
        }
        //disable表
        admin.disableTable(TableName.valueOf(tableName));
        //drop表
        admin.deleteTable(TableName.valueOf(tableName));
    }
    //复制快照
    public static void cloneTable(String tableName) throws IOException {
        //判断表是否存在
        if (!tableExists(tableName)) {
            System.out.println(tableName + " 表不存在");
        }
        //disable表
        admin.disableTable(TableName.valueOf(tableName));
        //创建快照
        String newTable = null;
        String snapshot = null;
        admin.snapshot(snapshot, TableName.valueOf(tableName));
//        admin.cloneSnapshot(snapshot, TableName.valueOf(newTable));
    }

    //创建命名空间
    public static void createNamespace(String ns) {
        NamespaceDescriptor namespaceDescriptor = NamespaceDescriptor.create(ns).build();
        try {
            admin.createNamespace(namespaceDescriptor);
        } catch (NamespaceExistException e) {
            System.out.println(ns + " 命名空间存在");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    //删除命名空间
    public static void deleteNamespace(String ns) {
        try {
            admin.deleteNamespace(ns);
        } catch (NamespaceNotFoundException e) {
            System.out.println(ns + " 命名空间不存在");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    //插入数据
    public static void putData(String tableName, String rowKey, String cf, String cn, String value) throws IOException {
        //获取表对象
        Table table = conn.getTable(TableName.valueOf(tableName));
        //创建put对象
        Put put = new Put(Bytes.toBytes(rowKey));
        //给put对象赋值
        put.addColumn(Bytes.toBytes(cf), Bytes.toBytes(cn), Bytes.toBytes(value));
        //插入数据
        table.put(put);
        //关闭表连接
        table.close();
    }

    //获取数据
    public static void getData(String tableName, String rowKey, String cf, String cn) throws IOException {
        //获取表对象
        Table table = conn.getTable(TableName.valueOf(tableName));
        //创建get对象
        Get get = new Get(Bytes.toBytes(rowKey));
        //指定列族
//        get.addFamily(Bytes.toBytes(cf));
        //指定列
        get.addColumn(Bytes.toBytes(cf), Bytes.toBytes(cn));
        //设置最大版本数
        get.setMaxVersions(3);
        //获取数据
        Result result = table.get(get);
        //解析result并打印
        for (Cell cell : result.rawCells()) {
            System.out.println("cf:" + Bytes.toString(CellUtil.cloneFamily(cell)) +
                    ",cn:" + Bytes.toString(CellUtil.cloneQualifier(cell)) +
                    ",value:" + Bytes.toString(CellUtil.clonevalue(cell)));
        }
        //关闭表连接
        table.close();
    }

    public static void scanData(String tableName) throws IOException {
        //获取表对象
        Table table = conn.getTable(TableName.valueOf(tableName));
        //构建scan对象
        Scan scan = new Scan(Bytes.toBytes("1"), Bytes.toBytes("luoy"));
        //扫描表
        ResultScanner resultScanner = table.getScanner(scan);
        //解析resultScanner并打印
        for (Result result : resultScanner) {
            for (Cell cell : result.rawCells()) {
                System.out.println("cf:" + Bytes.toString(CellUtil.cloneFamily(cell)) +
                        ",cn:" + Bytes.toString(CellUtil.cloneQualifier(cell)) +
                        ",value:" + Bytes.toString(CellUtil.clonevalue(cell)));
            }
        }
        //关闭表连接
        table.close();
    }
    //删除数据
    public static void deleteData(String tableName,String rowKey,String cf,String cn) throws IOException {
        //获取表对象
        Table table = conn.getTable(TableName.valueOf(tableName));
        //构建delete对象
        Delete delete = new Delete(Bytes.toBytes(rowKey));
        //删除指定列
        delete.addColumns(Bytes.toBytes(cf),Bytes.toBytes(cn),1633353779970l);
        //删除指定列族(命令行做不到)
//        delete.addFamily(Bytes.toBytes(cf));
        //删除数据
        table.delete(delete);
        //关闭表连接
        table.close();
    }

    public static void main(String[] args) throws IOException {
        deleteData("user","1","cf1","name");

        //关闭连接
        close();
    }
}