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RowFilter用于过滤row key
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import java.io.IOException;
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import org.apache.hadoop.conf.Configuration;
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import org.apache.hadoop.hbase.HBaseConfiguration;
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import org.apache.hadoop.hbase.HColumnDescriptor;
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import org.apache.hadoop.hbase.HTableDescriptor;
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import org.apache.hadoop.hbase.client.HBaseAdmin;
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import org.apache.hadoop.hbase.client.HTable;
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import org.apache.hadoop.hbase.client.Put;
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import org.apache.hadoop.hbase.client.Result;
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import org.apache.hadoop.hbase.client.ResultScanner;
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import org.apache.hadoop.hbase.client.Scan;
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import org.apache.hadoop.hbase.filter.BinaryComparator;
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import org.apache.hadoop.hbase.filter.BinaryPrefixComparator;
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import org.apache.hadoop.hbase.filter.CompareFilter;
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import org.apache.hadoop.hbase.filter.Filter;
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import org.apache.hadoop.hbase.filter.RegexStringComparator;
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import org.apache.hadoop.hbase.filter.RowFilter;
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import org.apache.hadoop.hbase.filter.SubstringComparator;
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public class TestHbaseRowFilter {
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String tableName = "test_row_filter";
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Configuration config = HBaseConfiguration.create();
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/**
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* 部分代码来自hbase权威指南
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* @throws IOException
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*/
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public void testRowFilter() throws IOException {
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HTable table = new HTable(config, tableName);
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Scan scan = new Scan();
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System.out.println("小于等于row010的行");
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Filter filter1 = new RowFilter(CompareFilter.CompareOp.LESS_OR_EQUAL,
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new BinaryComparator("row010".getBytes()));
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scan.setFilter(filter1);
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ResultScanner scanner1 = table.getScanner(scan);
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for (Result res : scanner1) {
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System.out.println(res);
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}
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scanner1.close();
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System.out.println("正则获取结尾为5的行");
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Filter filter2 = new RowFilter(CompareFilter.CompareOp.EQUAL,
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new RegexStringComparator(".*5[ DISCUZ_CODE_0 ]quot;));
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scan.setFilter(filter2);
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ResultScanner scanner2 = table.getScanner(scan);
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for (Result res : scanner2) {
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System.out.println(res);
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}
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scanner2.close();
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System.out.println("包含有5的行");
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Filter filter3 = new RowFilter(CompareFilter.CompareOp.EQUAL,
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new SubstringComparator("5"));
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scan.setFilter(filter3);
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ResultScanner scanner3 = table.getScanner(scan);
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for (Result res : scanner3) {
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System.out.println(res);
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}
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scanner3.close();
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System.out.println("开头是row01的");
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Filter filter4 = new RowFilter(CompareFilter.CompareOp.EQUAL,
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new BinaryPrefixComparator("row01".getBytes()));
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scan.setFilter(filter4);
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ResultScanner scanner4 = table.getScanner(scan);
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for (Result res : scanner4) {
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System.out.println(res);
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}
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scanner3.close();
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}
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/**
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* 初始化数据
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*/
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public void init() {
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// 创建表和初始化数据
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try {
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HBaseAdmin admin = new HBaseAdmin(config);
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if (!admin.tableExists(tableName)) {
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HTableDescriptor htd = new HTableDescriptor(tableName);
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HColumnDescriptor hcd1 = new HColumnDescriptor("data");
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htd.addFamily(hcd1);
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HColumnDescriptor hcd2 = new HColumnDescriptor("url");
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htd.addFamily(hcd2);
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admin.createTable(htd);
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}
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HTable table = new HTable(config, tableName);
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table.setAutoFlush(false);
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int count = 50;
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for (int i = 1; i <= count; ++i) {
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Put p = new Put(String.format("row%03d", i).getBytes());
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p.add("data".getBytes(), String.format("col%01d", i % 10)
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.getBytes(), String.format("data%03d", i).getBytes());
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p.add("url".getBytes(), String.format("col%01d", i % 10)
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.getBytes(), String.format("url%03d", i).getBytes());
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table.put(p);
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}
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table.close();
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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/**
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* @param args
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* @throws IOException
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*/
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public static void main(String[] args) throws IOException {
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TestHbaseRowFilter test = new TestHbaseRowFilter();
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test.init();
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test.testRowFilter();
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}
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- }
hbase RowFilter如何根据rowkey查询以及实例实现代码
最新推荐文章于 2024-08-16 09:47:16 发布