Java API操作HBase表数据

1.创建表myuser

     Configuration configuration = new Configuration();
        configuration.set("hbase.zookeeper.quorum","node01:2181,node02:2181,node03:2181");

        Connection connection = ConnectionFactory.createConnection(configuration);
  //获取连接对象，创建一张表
    //获取管理员对象，来对数据库进行DDL的操作
    Admin admin = connection.getAdmin();
     //指定我们的表名
    TableName myuser = TableName.valueOf("myuser");
    HTableDescriptor hTableDescriptor = new HTableDescriptor(myuser);
     //指定两个列族
    HColumnDescriptor f1 = new HColumnDescriptor("f1");
    HColumnDescriptor f2 = new HColumnDescriptor("f2");
    hTableDescriptor.addFamily(f1);
    hTableDescriptor.addFamily(f2);

    admin.createTable(hTableDescriptor);
    admin.close();

2.向表中添加数据

//创建put对象，并指定rowkey
        Put put = new Put("0001".getBytes());
        put.addColumn("f1".getBytes(),"id".getBytes(), Bytes.toBytes(1));
        put.addColumn("f1".getBytes(),"name".getBytes(), Bytes.toBytes("张三"));
        put.addColumn("f1".getBytes(),"age".getBytes(), Bytes.toBytes(18));

        put.addColumn("f2".getBytes(),"address".getBytes(), Bytes.toBytes("地球人"));
        put.addColumn("f2".getBytes(),"phone".getBytes(), Bytes.toBytes("158741025aa"));
        //插入数据
        myuser.put(put);

3.查询数据

        Get get = new Get(Bytes.toBytes("0003"));
        Result result = myuser.get(get);
        Cell[] cells = result.rawCells();
        //获取所有的列名称以及列的值
        for (Cell cell : cells) {
            //注意，如果列属性是int类型，那么这里就不会显示
            
if (Bytes.toString(CellUtil.cloneQualifier(cell)).equals("id" )|| Bytes.toString(CellUtil.cloneQualifier(cell)).equals("age")){
    System.out.println(Bytes.toString(CellUtil.cloneFamily(cell)));
    System.out.println(Bytes.toString(CellUtil.cloneQualifier(cell)));
    System.out.println(Bytes.toString(CellUtil.cloneRow(cell)));
    System.out.println(Bytes.toInt(CellUtil.cloneValue(cell)));
}else {
    System.out.println(Bytes.toString(CellUtil.cloneFamily(cell)));
    System.out.println(Bytes.toString(CellUtil.cloneQualifier(cell)));
    System.out.println(Bytes.toString(CellUtil.cloneRow(cell)));
    System.out.println(Bytes.toString(CellUtil.cloneValue(cell)));
}
        }

按照rowkey查询指定列族下面的指定列的值

 Get get=new Get("0003".getBytes());
// get.addFamily("f1".getBytes());

    get.addColumn("f1".getBytes(),"name".getBytes());
    Result result = myuser.get(get);

4.通过startRowKey和endRowKey进行扫描

 Scan scan =new Scan();
        scan.setStartRow("0002".getBytes());
        scan.setStopRow("0006".getBytes());

        ResultScanner scanner = myuser.getScanner(scan);
        for (Result result : scanner) {
            System.out.println("rowkey   "+Bytes.toString(result.getRow()));
/*
            System.out.println(Bytes.toInt(result.getValue("f1".getBytes(),"id".getBytes())));
            System.out.println(Bytes.toString(result.getValue("f1".getBytes(),"name".getBytes())));
            System.out.println(Bytes.toInt(result.getValue("f1".getBytes(),"age".getBytes())));
*/

            Cell[] cells = result.rawCells();
            for (Cell cell : cells) {
                if (Bytes.toString(CellUtil.cloneQualifier(cell)).equals("id" )|| Bytes.toString(CellUtil.cloneQualifier(cell)).equals("age")){
                    System.out.println(Bytes.toString(CellUtil.cloneFamily(cell)));
                    System.out.println(Bytes.toString(CellUtil.cloneQualifier(cell)));
                    System.out.println(Bytes.toString(CellUtil.cloneRow(cell)));
                    System.out.println(Bytes.toInt(CellUtil.cloneValue(cell)));
                }else {
                    System.out.println(Bytes.toString(CellUtil.cloneFamily(cell)));
                    System.out.println(Bytes.toString(CellUtil.cloneQualifier(cell)));
                    System.out.println(Bytes.toString(CellUtil.cloneRow(cell)));
                    System.out.println(Bytes.toString(CellUtil.cloneValue(cell)));
                }
            }
        }
    }

5.过滤器查询

hbase过滤器的比较运算符	运算符
LESS	<
LESS_OR_EQUAL	<=
EQUAL	=
NOT_EQUAL	<>
GREATER_OR_EQUAL	>=
GREATER	>
NO_OP	排除所有

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Hbase过滤器的专用过滤器	指定比较机制
BinaryComparator	按字节索引顺序比较指定字节数组，采用Bytes.compareTo(byte[])
BinaryPrefixComparator	跟前面相同，只是比较左端的数据是否相同
NullComparator	判断给定的是否为空
BitComparator	按位比较
RegexStringComparator	提供一个正则的比较器，仅支持 EQUAL 和非EQUAL
SubstringComparator	判断提供的子串是否出现在value中

6.rowKey过滤器RowFilter

RowFilter rowFilter = new RowFilter(CompareFilter.CompareOp.LESS_OR_EQUAL, new BinaryComparator(Bytes.toBytes("0003")));

7.列族过滤器FamilyFilte

FamilyFilter familyFilter = new FamilyFilter(CompareFilter.CompareOp.LESS, new SubstringComparator("f2"));

8.列过滤器QualifierFilter

QualifierFilter qualifierFilter = new QualifierFilter(CompareFilter.CompareOp.EQUAL, new SubstringComparator("name"));

9.列值过滤器ValueFilter

ValueFilter valueFilter = new ValueFilter(CompareFilter.CompareOp.EQUAL, new SubstringComparator("8"));

10.专用过滤器单列值过滤器SingleColumnValueFilter

SingleColumnValueFilter singleColumnValueFilter = new SingleColumnValueFilter("f1".getBytes(), "name".getBytes(), CompareFilter.CompareOp.EQUAL, "刘备".getBytes());

11.列值排除过滤器SingleColumnValueExcludeFilter

12.rowkey前缀过滤器PrefixFilter

查询以00开头的所有前缀的rowkey

PrefixFilter prefixFilter = new PrefixFilter("00".getBytes());

13.多过滤器综合查询FilterList

FilterList filterList = new FilterList();

        SingleColumnValueFilter singleColumnValueFilter = new SingleColumnValueFilter("f1".getBytes(), "name".getBytes(), CompareFilter.CompareOp.EQUAL, "刘备".getBytes());
        PrefixFilter prefixFilter = new PrefixFilter("00".getBytes());
        filterList.addFilter(singleColumnValueFilter);
        filterList.addFilter(prefixFilter);

14.根据rowkey删除数据

 Connection connection = ConnectionFactory.createConnection(conf);
        Table myuser = connection.getTable(TableName.valueOf("myuser"));
        Delete delete = new Delete("0001".getBytes());
        myuser.delete(delete);
        myuser.close();

15.删除表操作

  //获取连接
        Configuration conf =new Configuration();
        conf.set("hbase.zookeeper.quorum","node01:2181,node02:2181,node03:2181");
        Connection connection = ConnectionFactory.createConnection(conf);
        Admin admin = connection.getAdmin();
        admin.disableTable(TableName.valueOf("myuser"));
        admin.deleteTable(TableName.valueOf("myuser"));
        admin.close();