编写S3Select查询以排除换行符()行。
创始人
2024-12-05 16:00:18
0

用AWS SDK for Java 2.x编写以下代码示例来排除包含换行符的行:

import software.amazon.awssdk.auth.credentials.EnvironmentVariableCredentialsProvider;
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.s3.S3Client;
import software.amazon.awssdk.services.s3.model.ExpressionType;
import software.amazon.awssdk.services.s3.model.FormatType;
import software.amazon.awssdk.services.s3.model.InputSerialization;
import software.amazon.awssdk.services.s3.model.JSONInput;
import software.amazon.awssdk.services.s3.model.JSONOutput;
import software.amazon.awssdk.services.s3.model.OutputSerialization;
import software.amazon.awssdk.services.s3.model.SelectObjectContentEventStream;
import software.amazon.awssdk.services.s3.model.SelectObjectContentRequest;
import software.amazon.awssdk.services.s3.model.SelectObjectContentResponseHandler;
import software.amazon.awssdk.services.s3.model.SSECustomerKey;

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.nio.charset.StandardCharsets;

public class ExcludeCarriageReturnRows {

    public static void main(String[] args) throws IOException {

        Region region = Region.US_WEST_2;
        S3Client s3 = S3Client.builder()
                .credentialsProvider(EnvironmentVariableCredentialsProvider.create())
                .region(region)
                .build();

        // Set the parameters
        String bucketName = "mybucket";
        String key = "mydata.csv";
        String s3SelectQuery = "select * from s3object s where NOT regexp_like(s._1, '\\r$')";

        final SelectObjectContentRequest request = generateBaseCSVRequest(bucketName, key, s3SelectQuery);

        // Execute the selectObjectContent request and get the response handler
        SelectObjectContentResponseHandler responseHandler = getResponseHandler();
        s3.selectObjectContent(request, responseHandler);

        // Process response and write to output file
        processResponse(responseHandler);

        // Close S3 client
        s3.close();
    }

    private static SelectObjectContentRequest generateBaseCSVRequest(String bucket, String key, String query) {

        InputSerialization inputSerialization = InputSerialization.builder()
                .csv(CSVInput.builder().hasHeader(true

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