Lire par clés
Restez organisé à l'aide des collections
Enregistrez et classez les contenus selon vos préférences.
Lire à l'aide d'un ensemble non contigu de clés de ligne.
En savoir plus
Pour obtenir une documentation détaillée incluant cet exemple de code, consultez la page suivante :
Exemple de code
Sauf indication contraire, le contenu de cette page est régi par une licence Creative Commons Attribution 4.0, et les échantillons de code sont régis par une licence Apache 2.0. Pour en savoir plus, consultez les Règles du site Google Developers. Java est une marque déposée d'Oracle et/ou de ses sociétés affiliées.
[[["Facile à comprendre","easyToUnderstand","thumb-up"],["J'ai pu résoudre mon problème","solvedMyProblem","thumb-up"],["Autre","otherUp","thumb-up"]],[["Difficile à comprendre","hardToUnderstand","thumb-down"],["Informations ou exemple de code incorrects","incorrectInformationOrSampleCode","thumb-down"],["Il n'y a pas l'information/les exemples dont j'ai besoin","missingTheInformationSamplesINeed","thumb-down"],["Problème de traduction","translationIssue","thumb-down"],["Autre","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)."]]