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[[["易于理解","easyToUnderstand","thumb-up"],["解决了我的问题","solvedMyProblem","thumb-up"],["其他","otherUp","thumb-up"]],[["很难理解","hardToUnderstand","thumb-down"],["信息或示例代码不正确","incorrectInformationOrSampleCode","thumb-down"],["没有我需要的信息/示例","missingTheInformationSamplesINeed","thumb-down"],["翻译问题","translationIssue","thumb-down"],["其他","otherDown","thumb-down"]],[],[[["\u003cp\u003eThis content demonstrates how to verify the existence of a specific column family within a Bigtable table using C++.\u003c/p\u003e\n"],["\u003cp\u003eThe code utilizes the Bigtable Table Admin Client to retrieve table schema, which is then used to search for the specified column family.\u003c/p\u003e\n"],["\u003cp\u003eThe provided example outputs a message indicating whether the target column family is found or absent within the Bigtable table.\u003c/p\u003e\n"],["\u003cp\u003eAuthentication is necessary and the instructions are to set up Application Default Credentials to proceed.\u003c/p\u003e\n"],["\u003cp\u003eInstructions on how to navigate and find additional code samples for Bigtable and other Google Cloud products are included.\u003c/p\u003e\n"]]],[],null,["# Check if a column family exists.\n\nCode sample\n-----------\n\n### C++\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 namespace cbt = ::google::cloud::bigtable;\n namespace cbta = ::google::cloud::bigtable_admin;\n using ::google::cloud::StatusOr;\n [](cbta::BigtableTableAdminClient admin, std::string const& project_id,\n std::string const& instance_id, std::string const& table_id,\n std::string const& family_name) {\n std::string table_name = cbt::TableName(project_id, instance_id, table_id);\n\n google::bigtable::admin::v2::GetTableRequest r;\n r.set_name(table_name);\n r.set_view(google::bigtable::admin::v2::Table::FULL);\n\n StatusOr\u003cgoogle::bigtable::admin::v2::Table\u003e schema =\n admin.GetTable(std::move(r));\n\n if (!schema) throw std::move(schema).status();\n auto pos = schema-\u003ecolumn_families().find(family_name);\n if (pos == schema-\u003ecolumn_families().end()) {\n std::cout \u003c\u003c \"The column family \u003c\" \u003c\u003c family_name \u003c\u003c \"\u003e does not exist\";\n return;\n }\n std::cout \u003c\u003c \"The column family \u003c\" \u003c\u003c family_name \u003c\u003c \"\u003e does exist\\n\";\n }\n\nWhat's next\n-----------\n\n\nTo search and filter code samples for other Google Cloud products, see the\n[Google Cloud sample browser](/docs/samples?product=bigtable)."]]