Object Storage Service：Mengambil objek

import com.aliyun.oss.ClientBuilderConfiguration;
import com.aliyun.oss.common.comm.SignVersion;
import com.aliyun.oss.model.*;
import com.aliyun.oss.OSS;
import com.aliyun.oss.common.auth.*;
import com.aliyun.oss.OSSClientBuilder;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.InputStreamReader;

/**
 * Contoh-contoh membuat metadata objek selektif dan memilih objek.
 *
 */
public class SelectObjectSample {
    // Tentukan endpoint wilayah tempat bucket berada. Sebagai contoh, jika bucket berada di wilayah China (Hangzhou), atur endpoint ke https://oss-cn-hangzhou.aliyuncs.com. 
    private static String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
    // Tentukan nama bucket. Contoh: examplebucket. 
    private static String bucketName = "examplebucket";

    public static void main(String[] args) throws Exception {
      
      	// Dapatkan kredensial akses dari variabel lingkungan. Sebelum menjalankan kode sampel, pastikan variabel lingkungan OSS_ACCESS_KEY_ID dan OSS_ACCESS_KEY_SECRET telah dikonfigurasi. 
        EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
        // Tentukan wilayah tempat bucket berada. Sebagai contoh, jika bucket berada di wilayah China (Hangzhou), atur wilayah ke cn-hangzhou.
        String region = "cn-hangzhou";

        // Buat instance OSSClient. 
        // Panggil metode shutdown untuk melepaskan sumber daya terkait saat OSSClient tidak lagi digunakan.
        ClientBuilderConfiguration clientBuilderConfiguration = new ClientBuilderConfiguration();
        clientBuilderConfiguration.setSignatureVersion(SignVersion.V4);        
        OSS ossClient = OSSClientBuilder.create()
        .endpoint(endpoint)
        .credentialsProvider(credentialsProvider)
        .clientConfiguration(clientBuilderConfiguration)
        .region(region)               
        .build();
        // Tentukan jalur lengkap objek yang ingin Anda tanyakan, lalu tanyakan data objek menggunakan pernyataan SELECT. Jangan sertakan nama bucket dalam jalur lengkap. 
        // Tentukan jalur lengkap objek CSV. 
        selectCsvSample("test.csv", ossClient);
        // Tentukan jalur lengkap objek JSON. 
        selectJsonSample("test.json", ossClient);
        ossClient.shutdown();
    }

    private static void selectCsvSample(String key, OSS ossClient) throws Exception {
        // Tentukan isi objek yang ingin Anda unggah. 
        String content = "name,school,company,age\r\n" +
                "Lora Francis,School A,Staples Inc,27\r\n" +
                "Eleanor Little,School B,\"Conectiv, Inc\",43\r\n" +
                "Rosie Hughes,School C,Western Gas Resources Inc,44\r\n" +
                "Lawrence Ross,School D,MetLife Inc.,24";

        ossClient.putObject(bucketName, key, new ByteArrayInputStream(content.getBytes()));

        SelectObjectMetadata selectObjectMetadata = ossClient.createSelectObjectMetadata(
                new CreateSelectObjectMetadataRequest(bucketName, key)
                        .withInputSerialization(
                                new InputSerialization().withCsvInputFormat(
                                        // Tentukan pembatas yang digunakan untuk memisahkan catatan berbeda dalam konten. Contoh: \r\n. 
                                        new CSVFormat().withHeaderInfo(CSVFormat.Header.Use).withRecordDelimiter("\r\n"))));
        System.out.println(selectObjectMetadata.getCsvObjectMetadata().getTotalLines());
        System.out.println(selectObjectMetadata.getCsvObjectMetadata().getSplits());

        SelectObjectRequest selectObjectRequest =
                new SelectObjectRequest(bucketName, key)
                        .withInputSerialization(
                                new InputSerialization().withCsvInputFormat(
                                        new CSVFormat().withHeaderInfo(CSVFormat.Header.Use).withRecordDelimiter("\r\n")))
                        .withOutputSerialization(new OutputSerialization().withCsvOutputFormat(new CSVFormat()));
        // Gunakan pernyataan SELECT untuk menanyakan semua rekaman yang nilainya lebih besar dari 40 di kolom keempat. 
        selectObjectRequest.setExpression("select * from ossobject where _4 > 40");
        OSSObject ossObject = ossClient.selectObject(selectObjectRequest);

        // Baca isi objek. 
        BufferedReader reader = new BufferedReader(new InputStreamReader(ossObject.getObjectContent()));
        while (true) {
            String line = reader.readLine();
            if (line == null) {
                break;
            }
            System.out.println(line);
        }
        reader.close();

        ossClient.deleteObject(bucketName, key);
    }

    private static void selectJsonSample(String key, OSS ossClient) throws Exception {
        // Tentukan isi objek yang ingin Anda unggah. 
        final String content = "{\n" +
                "\t\"name\": \"Lora Francis\",\n" +
                "\t\"age\": 27,\n" +
                "\t\"company\": \"Staples Inc\"\n" +
                "}\n" +
                "{\n" +
                "\t\"name\": \"Eleanor Little\",\n" +
                "\t\"age\": 43,\n" +
                "\t\"company\": \"Conectiv, Inc\"\n" +
                "}\n" +
                "{\n" +
                "\t\"name\": \"Rosie Hughes\",\n" +
                "\t\"age\": 44,\n" +
                "\t\"company\": \"Western Gas Resources Inc\"\n" +
                "}\n" +
                "{\n" +
                "\t\"name\": \"Lawrence Ross\",\n" +
                "\t\"age\": 24,\n" +
                "\t\"company\": \"MetLife Inc.\"\n" +
                "}";

        ossClient.putObject(bucketName, key, new ByteArrayInputStream(content.getBytes()));

        SelectObjectRequest selectObjectRequest =
                new SelectObjectRequest(bucketName, key)
                        .withInputSerialization(new InputSerialization()
                                .withCompressionType(CompressionType.NONE)
                                .withJsonInputFormat(new JsonFormat().withJsonType(JsonType.LINES)))
                        .withOutputSerialization(new OutputSerialization()
                                .withCrcEnabled(true)
                                .withJsonOutputFormat(new JsonFormat()))
                        .withExpression("select * from ossobject as s where s.age > 40"); // Gunakan pernyataan SELECT untuk menanyakan data dalam objek. 

        OSSObject ossObject = ossClient.selectObject(selectObjectRequest);

        // Baca isi objek. 
        BufferedReader reader = new BufferedReader(new InputStreamReader(ossObject.getObjectContent()));
        while (true) {
            String line = reader.readLine();
            if (line == null) {
                break;
            }
            System.out.println(line);
        }
        reader.close();

        ossClient.deleteObject(bucketName, key);
    }
}

import oss2
from oss2.credentials import EnvironmentVariableCredentialsProvider

def select_call_back(consumed_bytes, total_bytes =  None):
        print('Bytes Terpakai:' + str(consumed_bytes) + '\n')

# Dapatkan kredensial akses dari variabel lingkungan. Sebelum menjalankan kode sampel, pastikan variabel lingkungan OSS_ACCESS_KEY_ID dan OSS_ACCESS_KEY_SECRET telah dikonfigurasi. 
auth = oss2.ProviderAuthV4(EnvironmentVariableCredentialsProvider())

# Tentukan endpoint wilayah tempat bucket berada. Sebagai contoh, jika bucket berada di wilayah China (Hangzhou), atur endpoint ke https://oss-cn-hangzhou.aliyuncs.com. 
endpoint = "https://oss-cn-hangzhou.aliyuncs.com"

# Tentukan ID wilayah yang sesuai dengan endpoint. Contoh: cn-hangzhou. Parameter ini diperlukan jika Anda menggunakan algoritma tanda tangan V4.
region = "cn-hangzhou"

# Tentukan nama bucket Anda.
bucket = oss2.Bucket(auth, endpoint, "yourBucketName", region=region)

key ='python_select.csv'
content ='Tom Hanks,USA,45\r\n'*1024
filename ='python_select.csv'

# Unggah file CSV. 
bucket.put_object(key, content)
# Konfigurasikan parameter untuk operasi SelectObject. 
csv_meta_params = {'RecordDelimiter': '\r\n'}
select_csv_params = {'CsvHeaderInfo': 'None',
                    'RecordDelimiter': '\r\n',
                    'LineRange': (500, 1000)}

csv_header = bucket.create_select_object_meta(key, csv_meta_params)
print(csv_header.rows)
print(csv_header.splits)
result = bucket.select_object(key, "select * from ossobject where _3 > 44", select_call_back, select_csv_params)
select_content = result.read()
print(select_content)

result = bucket.select_object_to_file(key, filename,
      "select * from ossobject where _3 > 44", select_call_back, select_csv_params)
bucket.delete_object(key)

###JSON DOCUMENT
key =  'python_select.json'
content =  "{\"contacts\":[{\"key1\":1,\"key2\":\"hello world1\"},{\"key1\":2,\"key2\":\"hello world2\"}]}"
filename =  'python_select.json'
# Unggah objek JSON DOCUMENT. 
bucket.put_object(key, content)
select_json_params = {'Json_Type': 'DOCUMENT'}
result = bucket.select_object(key, "select s.key2 from ossobject.contacts[*] s where s.key1 = 1", None, select_json_params)
select_content = result.read()
print(select_content)

result = bucket.select_object_to_file(key, filename,
      "select s.key2 from ossobject.contacts[*] s where s.key1 = 1", None, select_json_params)
bucket.delete_object(key)

###JSON LINES
key =  'python_select_lines.json'
content =  "{\"key1\":1,\"key2\":\"hello world1\"}\n{\"key1\":2,\"key2\":\"hello world2\"}"
filename =  'python_select.json'
# Unggah objek JSON LINES. 
bucket.put_object(key, content)
select_json_params = {'Json_Type': 'LINES'}
json_header = bucket.create_select_object_meta(key,select_json_params)
print(json_header.rows)
print(json_header.splits)

result = bucket.select_object(key, "select s.key2 from ossobject s where s.key1 = 1", None, select_json_params)
select_content =  result.read()
print(select_content)
result = bucket.select_object_to_file(key, filename,
           "select s.key2 from ossobject s where s.key1 = 1", None, select_json_params)
bucket.delete_object(key)