Hbase行键过滤器RowFilter
RowFilter是用来对rowkey进行过滤的,比较符如下:
| Operator | Description |
| LESS | 小于 |
| LESS_OR_EQUAL | 小于等于 |
| EQUAL | 等于 |
| NOT_EQUAL | 不等于 |
| GREATER_OR_EQUAL | 大于等于 |
| GREATER | 大于 |
| NO_OP | 排除所有 |
| Comparator | Description |
| Bytes.compareTo()比较BinaryPrefixComparator | 和 |
| Does not compare against an actual value but whether a given one is null, or not null. | |
| Performs a bitwise comparison, providing a BitwiseOp class with AND, OR, and XOR operators. | |
|
| |
| contains()来判断<span “=”” style=”word-wrap: break-word; font-size: 9pt;”> |
下面是相关比较符的例子
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package com.hxl;
import java.io.IOException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.CellUtil;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.client.ResultScanner;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.filter.BinaryComparator;
import org.apache.hadoop.hbase.filter.CompareFilter;
import org.apache.hadoop.hbase.filter.Filter;
import org.apache.hadoop.hbase.filter.RowFilter;
import org.apache.hadoop.hbase.util.Bytes;
import com.hxl.ConnectDB;
public class RowFilterTest {
public void rowfilter(String tablename, String rowkeyvalue) {
Configuration configuration = null;
configuration = new ConnectDB().getConf();
try {
HTable table = new HTable(configuration, tablename);
Filter filter1 = new RowFilter(CompareFilter.CompareOp.EQUAL,
new BinaryComparator(Bytes.toBytes(rowkeyvalue)));
// EQUAL =
Scan s = new Scan();
s.setFilter(filter1);
ResultScanner rs = table.getScanner(s);
for (Result r : rs) {
System.out.println(“rowkey:” + new String(r.getRow()));
for (KeyValue keyValue : r.raw()) {
System.out.println(“列族:” + new String(keyValue.getFamily())
+ “ 列:” + new String(keyValue.getQualifier()) + “:”
+ new String(keyValue.getValue()));
}
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
相关的过滤方法使用:
提取rowkey以01结尾数据
Filter filter = new RowFilter(CompareFilter.CompareOp.EQUAL,new RegexStringComparator(“.*01$”));
提取rowkey以包含201407的数据
Filter filter = new RowFilter(CompareFilter.CompareOp.EQUAL,new SubstringComparator(“201407”));
提取rowkey以123开头的数据
Filter filter = new RowFilter(CompareFilter.CompareOp.EQUAL,new BinaryPrefixComparator(“123”.getBytes()));
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