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hbase如何根據(jù)時間范圍查詢數(shù)據(jù)

小億
208
2024-03-29 12:57:10

在HBase中,可以使用Scan對象和Filter實現(xiàn)根據(jù)時間范圍查詢數(shù)據(jù)。以下是一個示例代碼:

import org.apache.hadoop.hbase.client.Connection;
import org.apache.hadoop.hbase.client.ConnectionFactory;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.filter.FilterList;
import org.apache.hadoop.hbase.filter.SingleColumnValueFilter;
import org.apache.hadoop.hbase.util.Bytes;

import java.io.IOException;

public class TimeRangeQuery {
    public static void main(String[] args) throws IOException {
        Connection connection = ConnectionFactory.createConnection();
        Table table = connection.getTable(TableName.valueOf("your_table_name"));

        Scan scan = new Scan();
        long startTime = System.currentTimeMillis() - 3600000; // 1 hour ago
        long endTime = System.currentTimeMillis(); // current time

        FilterList filterList = new FilterList(FilterList.Operator.MUST_PASS_ALL);
        filterList.addFilter(new SingleColumnValueFilter(Bytes.toBytes("cf"), Bytes.toBytes("timestamp"),
                CompareFilter.CompareOp.GREATER_OR_EQUAL, Bytes.toBytes(startTime)));
        filterList.addFilter(new SingleColumnValueFilter(Bytes.toBytes("cf"), Bytes.toBytes("timestamp"),
                CompareFilter.CompareOp.LESS_OR_EQUAL, Bytes.toBytes(endTime)));

        scan.setFilter(filterList);

        ResultScanner scanner = table.getScanner(scan);
        for (Result result : scanner) {
            // process the result
        }

        table.close();
        connection.close();
    }
}

在上面的代碼中,首先創(chuàng)建了一個Scan對象,然后設(shè)置了時間范圍的過濾器FilterList。在這個過濾器中,使用SingleColumnValueFilter來指定時間戳列的值在指定范圍內(nèi)。最后,通過table.getScanner方法獲取符合條件的數(shù)據(jù),并進(jìn)行處理。

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