使用Java Api 对HBase进行简单操作

/**
 * 功能：测试Hbase基本的增删改查操作
 * Created by liuhuichao on 2016/12/5.
 */
public class HbaseCRUDTest {
    public static Configuration configuration;

    static{
        configuration= HBaseConfiguration.create();
        configuration.set("hbase.zookeeper.quorum","lhc-centos");
    }

    /**
     * 测试创建student表:测试已通过
     * @throws IOException
     */
    @Test
    public void createTable() throws IOException {
        HBaseAdmin admin=new HBaseAdmin(configuration); //HBaseAdmin负责管理HBase集群，添加和丢弃表
        if(admin.tableExists("studentInfo")){
            System.out.println("student表已经存在");
            return;
        }
        HTableDescriptor descriptor=new HTableDescriptor("studentInfo");
        descriptor.addFamily(new HColumnDescriptor("Name"));//创建列族，名字是Name
        descriptor.addFamily(new HColumnDescriptor("Address"));//创建列族，名字是Address
        admin.createTable(descriptor); //创建表
        System.out.println("student表创建成功！！！");
    }

    /**
     * 功能：想hbase中插入一行记录 --测试已通过
     * @throws IOException
     */
    @Test
    public void insertHbaseStudentTable() throws IOException {
        HTable table=new HTable(configuration, Bytes.toBytes("studentInfo"));
        Put put=new Put(Bytes.toBytes("1"));
        put.addColumn(Bytes.toBytes("Name"),Bytes.toBytes("firstName"),Bytes.toBytes("liu"));
        put.addColumn(Bytes.toBytes("Name"),Bytes.toBytes("secondName"),Bytes.toBytes("huichao"));
        put.addColumn(Bytes.toBytes("Address"),Bytes.toBytes("province"),Bytes.toBytes("hebei"));
        put.addColumn(Bytes.toBytes("Address"),Bytes.toBytes("city"),Bytes.toBytes("baoding"));
        put.addColumn(Bytes.toBytes("Address"),Bytes.toBytes("area"),Bytes.toBytes("qingyuan"));
        table.put(put);
    }

    /**
     * 功能：根据行健获取数据
     * @throws IOException
     */
    @Test
    public void getDataByRowKey() throws IOException {
        HTable table=new HTable(configuration, Bytes.toBytes("studentInfo"));
        Get get=new Get(Bytes.toBytes("1"));
        Result result=table.get(get);
        for(KeyValue kv :result.list()){
            System.out.println("family:"+Bytes.toString(kv.getFamilyArray()));//所属列族名称
            System.out.println("qualifier:"+Bytes.toString(kv.getQualifier()));//列名称
            System.out.println("value:"+Bytes.toString(kv.getValue()));//存储的值
            System.out.println("Timestamp:"+kv.getTimestamp());//获取时间戳
        }
    }

    /**
     * 功能：测试全表扫描
     * @throws IOException
     */
    @Test
    public void selectHBaseScan() throws IOException {
        HTable table=new HTable(configuration, Bytes.toBytes("studentInfo"));
        /*遍历查询*/
        Scan scan=new Scan();
        ResultScanner rs=null;
        try {
            rs=table.getScanner(scan);
            for(Result result : rs){
                for(KeyValue kv : result.list()){
                    System.out.println("family:"+Bytes.toString(kv.getFamilyArray()));//所属列族名称
                    System.out.println("qualifier:"+Bytes.toString(kv.getQualifier()));//列名称
                    System.out.println("value:"+Bytes.toString(kv.getValue()));//存储的值
                    System.out.println("Timestamp:"+kv.getTimestamp());//获取时间戳
                }
            }
        }finally {
            rs.close();
        }
    }

    /**
     * 更新
     * @throws Exception
     */
    @Test
    public void updateHBase() throws  Exception{
        HTable table=new HTable(configuration,Bytes.toBytes("studentInfo"));
        Put put=new Put(Bytes.toBytes("1")); //设置行健
        put.add(Bytes.toBytes("Address"),Bytes.toBytes("city"),Bytes.toBytes("beijing"));///更新的时候找对族名和列名，再给定新的value值就可以了
        table.put(put);
    }

    /**
     * 功能：查询nickname的多个(本示例为2个)版本值.
     * @throws Exception
     */
    @Test
    public void selectSomeVersion() throws  Exception{
        HTable table=new HTable(configuration,Bytes.toBytes("studentInfo"));
        Get get=new Get(Bytes.toBytes("1"));
        get.addColumn(Bytes.toBytes("Address"),Bytes.toBytes("city"));
       // get.setMaxVersions(3);
        List<KeyValue> results=table.get(get).list();
        int total=results.size();
        System.out.println("Address列族中city列的各个版本值");
        for(int i=0;i<total;i++){
            System.out.println(Bytes.toString(results.get(i).getValue()));
        }
    }

    /**
     * 功能：删除指定的某一行
     * @throws Exception
     */
    @Test
    public void deleteColumn() throws  Exception{
        HTable table = new HTable(configuration, Bytes.toBytes("studentInfo"));//HTabel负责跟记录相关的操作如增删改查等
        Delete deleteAll = new Delete(Bytes.toBytes("1"));
        table.delete(deleteAll);
    }

    /**
     * 功能：删除表
     * @throws Exception
     */
    @Test
    public void deleteTable() throws Exception{
        HBaseAdmin admin=new HBaseAdmin(configuration); //HBaseAdmin负责管理HBase集群，添加和丢弃表
        admin.disableTable("student");
        admin.deleteTable("student");
    }

}