scan的filter使用

本次操作的hbase的t1表的数据是：

hbase(main):015:0> scan 't1'
ROW                                              COLUMN+CELL                                                                                                                                 
 1                                               column=f1:age, timestamp=1468824267106, value=10                                                                                            
 1                                               column=f1:gender, timestamp=1468824289990, value=male                                                                                       
 1                                               column=f1:name, timestamp=1468824137463, value=zhangsan                                                                                     
 2                                               column=f1:name, timestamp=1468824236014, value=lisi                                                                                         
 3                                               column=f1:name, timestamp=1468824247109, value=wangwu                                                                                       
 4                                               column=f1:birthday, timestamp=1468825870158, value=1993                                                                                     
 4                                               column=f1:name, timestamp=1468825659207, value=zhaoliu                                                                                      
 a1                                              column=f1:name, timestamp=1469000782113, value=a1                                                                                           
 a2                                              column=f1:name, timestamp=1469000805242, value=a2                                                                                           
 a3                                              column=f1:name, timestamp=1469000813427, value=a3                                                                                           
7 row(s) in 0.0530 seconds

需求1：查询rk为数字的全部记录

public class TestFilter {
    public static void main(String[] args) throws Exception {
        new TestFilter().test1();
    }
    
    public void test1() throws Exception{
        Configuration conf = HBaseConfiguration.create();
        conf.set("hbase.zookeeper.quorum", "hadoop26:2181");
        conf.set("hbase.rootdir", "hdfs://hadoop26:9000/hbase");
        HTable hTable = new HTable(conf, "t1");
        Scan scan = new Scan();
        scan.setStartRow("/".getBytes());//重点是在这里，因为rk是按照字节顺序排序的，/的asc在数字之前
        scan.setStopRow(":".getBytes());
        ResultScanner scanner = hTable.getScanner(scan);
        for (Result result : scanner) {
            System.out.println(new String(result.getRow()));
            Cell[] rawCells = result.rawCells();
            for (Cell cell : rawCells) {
                System.out.println(new String(CellUtil.cloneFamily(cell))+"\t"+new String(CellUtil.cloneQualifier(cell))+"\t"+new String(CellUtil.cloneValue(cell)));
            }
        }
        hTable.close();
    }
}

需求2：查询以字母a开头的数据

public class TestFilter {
    public static void main(String[] args) throws Exception {
        new TestFilter().test2();
    }
    
    public void test2() throws Exception{
        Configuration conf = HBaseConfiguration.create();
        conf.set("hbase.zookeeper.quorum", "hadoop26:2181");
        conf.set("hbase.rootdir", "hdfs://hadoop26:9000/hbase");
        HTable hTable = new HTable(conf, "t1");
        Scan scan = new Scan();
        Filter filter = new RowFilter(CompareOp.EQUAL,new RegexStringComparator("^a"));
        scan.setFilter(filter);
        ResultScanner scanner = hTable.getScanner(scan);
        for (Result result : scanner) {
            System.out.println(new String(result.getRow()));
            Cell[] rawCells = result.rawCells();
            for (Cell cell : rawCells) {
                System.out.println(new String(CellUtil.cloneFamily(cell))+"\t"+new String(CellUtil.cloneQualifier(cell))+"\t"+new String(CellUtil.cloneValue(cell)));
            }
        }
        hTable.close();
    }
}