获取或创建列族

自动创建列族（如果它不存在）。

代码示例

C++

如需了解如何安装和使用 Bigtable 的客户端库，请参阅 Bigtable 客户端库。

在 GitHub 上查看 反馈

namespace cbt = ::google::cloud::bigtable;
namespace cbta = ::google::cloud::bigtable_admin;
using ::google::bigtable::admin::v2::ModifyColumnFamiliesRequest;
using ::google::cloud::StatusOr;
[](cbta::BigtableTableAdminClient admin, std::string const& project_id,
   std::string const& instance_id, std::string const& table_id,
   std::string const& family_name) {
  std::string table_name = cbt::TableName(project_id, instance_id, table_id);

  google::bigtable::admin::v2::GetTableRequest r;
  r.set_name(table_name);
  r.set_view(google::bigtable::admin::v2::Table::FULL);

  StatusOr<google::bigtable::admin::v2::Table> schema =
      admin.GetTable(std::move(r));

  if (!schema) throw std::runtime_error(schema.status().message());
  auto pos = schema->column_families().find(family_name);
  if (pos == schema->column_families().end()) {
    // Try to create the column family instead:
    ModifyColumnFamiliesRequest::Modification mod;
    mod.set_id(family_name);
    mod.mutable_create()->mutable_gc_rule()->set_max_num_versions(5);

    auto modified = admin.ModifyColumnFamilies(table_name, {std::move(mod)});
    if (!modified) throw std::runtime_error(schema.status().message());
    schema = *std::move(modified);
    pos = schema->column_families().find(family_name);
  }

  if (pos == schema->column_families().end()) {
    throw std::runtime_error("GetOrCreateFamily failed");
  }

  google::bigtable::admin::v2::ColumnFamily family = pos->second;
  std::cout << "Column family name: " << pos->first
            << "\nColumn family details: " << family.DebugString() << "\n";
}

后续步骤

如需搜索和过滤其他 Google Cloud 产品的代码示例，请参阅 Google Cloud 示例浏览器。