Von Schlüsseln lesen
Mit Sammlungen den Überblick behalten
Sie können Inhalte basierend auf Ihren Einstellungen speichern und kategorisieren.
Mit einem nicht zusammenhängenden Satz von Zeilenschlüsseln lesen.
Weitere Informationen
Eine ausführliche Dokumentation, die dieses Codebeispiel enthält, finden Sie hier:
Codebeispiel
Nächste Schritte
Wenn Sie nach Codebeispielen für andere Google Cloud -Produkte suchen und filtern möchten, können Sie den Google Cloud -Beispielbrowser verwenden.
Sofern nicht anders angegeben, sind die Inhalte dieser Seite unter der Creative Commons Attribution 4.0 License und Codebeispiele unter der Apache 2.0 License lizenziert. Weitere Informationen finden Sie in den Websiterichtlinien von Google Developers. Java ist eine eingetragene Marke von Oracle und/oder seinen Partnern.
[[["Leicht verständlich","easyToUnderstand","thumb-up"],["Mein Problem wurde gelöst","solvedMyProblem","thumb-up"],["Sonstiges","otherUp","thumb-up"]],[["Schwer verständlich","hardToUnderstand","thumb-down"],["Informationen oder Beispielcode falsch","incorrectInformationOrSampleCode","thumb-down"],["Benötigte Informationen/Beispiele nicht gefunden","missingTheInformationSamplesINeed","thumb-down"],["Problem mit der Übersetzung","translationIssue","thumb-down"],["Sonstiges","otherDown","thumb-down"]],[],[[["\u003cp\u003eThis page provides code samples in Go, Java, and Python for reading data from a Bigtable database using row keys.\u003c/p\u003e\n"],["\u003cp\u003eThe code examples demonstrate how to read a single row using a specific row key in all three mentioned languages.\u003c/p\u003e\n"],["\u003cp\u003eThe Java example illustrates reading specific cells by specifying the column family and qualifier.\u003c/p\u003e\n"],["\u003cp\u003eThe page directs you to resources for installing the Bigtable client library and setting up authentication credentials.\u003c/p\u003e\n"],["\u003cp\u003eYou can access other code samples for other Google Cloud products via the Google Cloud sample browser, as mentioned at the end.\u003c/p\u003e\n"]]],[],null,["Read using a noncontiguous set of row keys.\n\nExplore further\n\n\nFor detailed documentation that includes this code sample, see the following:\n\n- [Go hello world](/bigtable/docs/samples-go-hello)\n- [Java hello world](/bigtable/docs/samples-java-hello-world)\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 log.Printf(\"Getting a single greeting by row key:\")\n row, err := tbl.ReadRow(ctx, rowKeys[0], bigtable.RowFilter(bigtable.ColumnFilter(columnName)))\n if err != nil {\n \tlog.Fatalf(\"Could not read row with key %s: %v\", rowKeys[0], err)\n }\n log.Printf(\"\\t%s = %s\\n\", rowKeys[0], string(row[columnFamilyName][0].Value))\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 try {\n System.out.println(\"\\nReading a single row by row key\");\n Row row = dataClient.readRow(TableId.of(tableId), ROW_KEY_PREFIX + 0);\n System.out.println(\"Row: \" + row.getKey().toStringUtf8());\n for (RowCell cell : row.getCells()) {\n System.out.printf(\n \"Family: %s Qualifier: %s Value: %s%n\",\n cell.getFamily(), cell.getQualifier().toStringUtf8(), cell.getValue().toStringUtf8());\n }\n return row;\n } catch (NotFoundException e) {\n System.err.println(\"Failed to read from a non-existent table: \" + e.getMessage());\n return null;\n }\n try {\n System.out.println(\"\\nReading specific cells by family and qualifier\");\n Row row = dataClient.readRow(TableId.of(tableId), ROW_KEY_PREFIX + 0);\n System.out.println(\"Row: \" + row.getKey().toStringUtf8());\n List\u003cRowCell\u003e cells = row.getCells(COLUMN_FAMILY, COLUMN_QUALIFIER_NAME);\n for (RowCell cell : cells) {\n System.out.printf(\n \"Family: %s Qualifier: %s Value: %s%n\",\n cell.getFamily(), cell.getQualifier().toStringUtf8(), cell.getValue().toStringUtf8());\n }\n return cells;\n } catch (NotFoundException e) {\n System.err.println(\"Failed to read from a non-existent table: \" + e.getMessage());\n return null;\n }\n\nPython\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 print(\"Getting a single greeting by row key.\")\n key = \"greeting0\".encode()\n\n row = table.read_row(key, row_filter)\n cell = row.cells[column_family_id][column][0]\n print(cell.value.decode(\"utf-8\"))\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)."]]