cassandra cpp driver中bind list——用cass_statement_bind_collection函数

转载于 2017-03-14 15:50:00 发布 · 85 阅读

本文介绍了一个使用Cassandra API向collections表中插入带有多个项的集合的具体示例。通过C语言实现，展示了如何创建并绑定集合数据到预处理语句，完成数据的有效存储。

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CassError insert_into_collections(CassSession* session, const char* key, const char* items[]) {
  CassError rc = CASS_OK;
  CassStatement* statement = NULL;
  CassFuture* future = NULL;
  CassCollection* collection = NULL;
  const char** item = NULL;
  const char* query = "INSERT INTO examples.collections (key, items) VALUES (?, ?);";

  statement = cass_statement_new(query, 2);

  cass_statement_bind_string(statement, 0, key);

  collection = cass_collection_new(CASS_COLLECTION_TYPE_SET, 2);
  for (item = items; *item; item++) {
    cass_collection_append_string(collection, *item);
  }
  cass_statement_bind_collection(statement, 1, collection);
  cass_collection_free(collection);

  future = cass_session_execute(session, statement);
  cass_future_wait(future);

  rc = cass_future_error_code(future);
  if (rc != CASS_OK) {
    print_error(future);
  }

  cass_future_free(future);
  cass_statement_free(statement);

  return rc;
}