Aggiungere un valore a una cella aggregata
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Aggiungere un numero intero a una cella aggregata. Questo tipo di scrittura effettua una richiesta API AddToCell.
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Per la documentazione dettagliata che include questo esempio di codice, vedi quanto segue:
Esempio di codice
Salvo quando diversamente specificato, i contenuti di questa pagina sono concessi in base alla licenza Creative Commons Attribution 4.0, mentre gli esempi di codice sono concessi in base alla licenza Apache 2.0. Per ulteriori dettagli, consulta le norme del sito di Google Developers. Java è un marchio registrato di Oracle e/o delle sue consociate.
[[["Facile da capire","easyToUnderstand","thumb-up"],["Il problema è stato risolto","solvedMyProblem","thumb-up"],["Altra","otherUp","thumb-up"]],[["Difficile da capire","hardToUnderstand","thumb-down"],["Informazioni o codice di esempio errati","incorrectInformationOrSampleCode","thumb-down"],["Mancano le informazioni o gli esempi di cui ho bisogno","missingTheInformationSamplesINeed","thumb-down"],["Problema di traduzione","translationIssue","thumb-down"],["Altra","otherDown","thumb-down"]],[],[[["\u003cp\u003eThis page demonstrates how to add an integer to an aggregate cell in Bigtable, using the AddToCell API request.\u003c/p\u003e\n"],["\u003cp\u003eThe provided code samples illustrate how to increment a view count for a specific page in both Go and Java.\u003c/p\u003e\n"],["\u003cp\u003eThe examples show how to bucket views into hourly counts, and demonstrates the use of the AddToCell method in Go and the addToCell/mergeToCell methods in Java.\u003c/p\u003e\n"],["\u003cp\u003eTo utilize the provided code you must set up Application Default Credentials and install the Bigtable client library.\u003c/p\u003e\n"]]],[],null,["Add an integer to an aggregate cell. This type of write makes an AddToCell API request.\n\nExplore further\n\n\nFor detailed documentation that includes this code sample, see the following:\n\n- [Write examples](/bigtable/docs/writing-data)\n\nCode sample \n\nGo\n\n\nTo learn how to install and use the client library for Bigtable, see\n[Bigtable client libraries](/bigtable/docs/reference/libraries).\n\n\nTo authenticate to Bigtable, set up Application Default Credentials.\nFor more information, see\n\n[Set up authentication for a local development environment](/docs/authentication/set-up-adc-local-dev-environment).\n\n import (\n \t\"context\"\n \t\"fmt\"\n \t\"io\"\n \t\"time\"\n\n \t\"cloud.google.com/go/bigtable\"\n )\n\n func writeAggregate(w io.Writer, projectID, instanceID string, tableName string) error {\n \t// projectID := \"my-project-id\"\n \t// instanceID := \"my-instance-id\"\n \t// tableName := \"mobile-time-series\"\n\n \tctx := context.Background()\n \tclient, err := bigtable.https://cloud.google.com/go/docs/reference/cloud.google.com/go/bigtable/latest/index.html#cloud_google_com_go_bigtable_Client_NewClient(ctx, projectID, instanceID)\n \tif err != nil {\n \t\treturn fmt.Errorf(\"bigtable.NewClient: %w\", err)\n \t}\n \tdefer client.Close()\n \ttbl := client.https://cloud.google.com/go/docs/reference/cloud.google.com/go/bigtable/latest/index.html#cloud_google_com_go_bigtable_Client_Open(tableName)\n \tcolumnFamilyName := \"view_count\"\n \tviewTimestamp, err := time.Parse(time.RFC3339, \"2024-03-13T12:41:34Z\")\n \tif err != nil {\n \t\treturn err\n \t}\n \thourlyBucket := viewTimestamp.Truncate(time.Hour)\n\n \tmut := bigtable.https://cloud.google.com/go/docs/reference/cloud.google.com/go/bigtable/latest/index.html#cloud_google_com_go_bigtable_Mutation_NewMutation()\n \tmut.https://cloud.google.com/go/docs/reference/cloud.google.com/go/bigtable/latest/index.html#cloud_google_com_go_bigtable_Mutation_AddIntToCell(columnFamilyName, \"views\", bigtable.https://cloud.google.com/go/docs/reference/cloud.google.com/go/bigtable/latest/index.html#cloud_google_com_go_bigtable_Timestamp_Time(hourlyBucket), 1)\n\n \trowKey := \"page#index.html\"\n \tif err := tbl.https://cloud.google.com/go/docs/reference/cloud.google.com/go/bigtable/latest/index.html#cloud_google_com_go_bigtable_Table_Apply(ctx, rowKey, mut); err != nil {\n \t\treturn fmt.Errorf(\"Apply: %w\", err)\n \t}\n\n \tfmt.Fprintf(w, \"Successfully wrote row: %s\\n\", rowKey)\n \treturn nil\n }\n\nJava\n\n\nTo learn how to install and use the client library for Bigtable, see\n[Bigtable client libraries](/bigtable/docs/reference/libraries).\n\n\nTo authenticate to Bigtable, set up Application Default Credentials.\nFor more information, see\n\n[Set up authentication for a local development environment](/docs/authentication/set-up-adc-local-dev-environment).\n\n\n import com.google.cloud.bigtable.data.v2.https://cloud.google.com/java/docs/reference/google-cloud-bigtable/latest/com.google.cloud.bigtable.data.v2.BigtableDataClient.html;\n import com.google.cloud.bigtable.data.v2.models.https://cloud.google.com/java/docs/reference/google-cloud-bigtable/latest/com.google.cloud.bigtable.data.v2.models.RowMutation.html;\n import com.google.common.primitives.Longs;\n import com.google.protobuf.https://cloud.google.com/java/docs/reference/protobuf/latest/com.google.protobuf.ByteString.html;\n import java.time.Instant;\n import java.time.temporal.ChronoUnit;\n\n public class WriteAggregate {\n private static final String COUNT_COLUMN_FAMILY_NAME = \"view_count\";\n private static final long MICROS_PER_MILLI = 1000;\n\n public static void writeAggregate(String projectId, String instanceId, String tableId) {\n // String projectId = \"my-project-id\";\n // String instanceId = \"my-instance-id\";\n // String tableId = \"page-view-counter\";\n\n try (https://cloud.google.com/java/docs/reference/google-cloud-bigtable/latest/com.google.cloud.bigtable.data.v2.BigtableDataClient.html dataClient = https://cloud.google.com/java/docs/reference/google-cloud-bigtable/latest/com.google.cloud.bigtable.data.v2.BigtableDataClient.html.create(projectId, instanceId)) {\n\n String rowKey = \"page#index.html\";\n Instant viewTimestamp = Instant.parse(\"2024-03-13T12:41:34.123Z\");\n\n // Bucket the views for an hour into a single count, giving us an hourly view count for a\n // given page.\n Instant hourlyBucket = viewTimestamp.truncatedTo(ChronoUnit.HOURS);\n long hourlyBucketMicros = hourlyBucket.toEpochMilli() * MICROS_PER_MILLI;\n\n https://cloud.google.com/java/docs/reference/google-cloud-bigtable/latest/com.google.cloud.bigtable.data.v2.models.RowMutation.html rowMutation =\n https://cloud.google.com/java/docs/reference/google-cloud-bigtable/latest/com.google.cloud.bigtable.data.v2.models.RowMutation.html.create(tableId, rowKey)\n .addToCell(COUNT_COLUMN_FAMILY_NAME, \"views\", hourlyBucketMicros, 1);\n\n dataClient.https://cloud.google.com/java/docs/reference/google-cloud-bigtable/latest/com.google.cloud.bigtable.data.v2.BigtableDataClient.html#com_google_cloud_bigtable_data_v2_BigtableDataClient_mutateRow_com_google_cloud_bigtable_data_v2_models_RowMutation_(rowMutation);\n System.out.printf(\"Successfully wrote row %s\", rowKey);\n\n } catch (Exception e) {\n System.out.println(\"Error during WriteAggregate: \\n\" + e.toString());\n }\n }\n\n public static void mergeAggregate(String projectId, String instanceId, String tableId) {\n // String projectId = \"my-project-id\";\n // String instanceId = \"my-instance-id\";\n // String tableId = \"page-view-counter\";\n\n try (https://cloud.google.com/java/docs/reference/google-cloud-bigtable/latest/com.google.cloud.bigtable.data.v2.BigtableDataClient.html dataClient = https://cloud.google.com/java/docs/reference/google-cloud-bigtable/latest/com.google.cloud.bigtable.data.v2.BigtableDataClient.html.create(projectId, instanceId)) {\n\n String rowKey = \"page#index.html\";\n Instant viewTimestamp = Instant.parse(\"2024-03-13T12:41:34.123Z\");\n\n // Bucket the views for an hour into a single count, giving us an hourly view count for a\n // given page.\n Instant hourlyBucket = viewTimestamp.truncatedTo(ChronoUnit.HOURS);\n long hourlyBucketMicros = hourlyBucket.toEpochMilli() * MICROS_PER_MILLI;\n\n https://cloud.google.com/java/docs/reference/google-cloud-bigtable/latest/com.google.cloud.bigtable.data.v2.models.RowMutation.html rowMutation =\n https://cloud.google.com/java/docs/reference/google-cloud-bigtable/latest/com.google.cloud.bigtable.data.v2.models.RowMutation.html.create(tableId, rowKey)\n .mergeToCell(\n COUNT_COLUMN_FAMILY_NAME,\n \"views\",\n hourlyBucketMicros,\n https://cloud.google.com/java/docs/reference/protobuf/latest/com.google.protobuf.ByteString.html.https://cloud.google.com/java/docs/reference/protobuf/latest/com.google.protobuf.ByteString.html#com_google_protobuf_ByteString_copyFrom_byte___(Longs.toByteArray(1L)));\n\n dataClient.https://cloud.google.com/java/docs/reference/google-cloud-bigtable/latest/com.google.cloud.bigtable.data.v2.BigtableDataClient.html#com_google_cloud_bigtable_data_v2_BigtableDataClient_mutateRow_com_google_cloud_bigtable_data_v2_models_RowMutation_(rowMutation);\n System.out.printf(\"Successfully wrote row %s\", rowKey);\n\n } catch (Exception e) {\n System.out.println(\"Error during mergeAggregate: \\n\" + e.toString());\n }\n }\n }\n\nWhat's next\n\n\nTo search and filter code samples for other Google Cloud products, see the\n[Google Cloud sample browser](/docs/samples?product=bigtable)."]]