mongoc

前言

按照mongoc说明书, 做个mongoc_collection_count试验. 返回类型PRId64很大啊, 例子中格式化成字符串不好使, 只能先按longlong用了.

记录

int testcase_mongoc_example_document_query_special_count(int argc, char* argv[]) { mongoc_client_t* client = NULL; mongoc_collection_t* collection = NULL; const bson_t* doc = NULL; bson_t* query = NULL; bson_t child = BSON_INITIALIZER; long lIndex = 0; char szBuf[260] = {'\0'}; int64_t count = 0; bson_error_t error = {0}; char *uri_str = NULL; mongoc_init(); client = mongoc_client_new( "mongodb://localhost:27017/?appname=find-specific-example"); collection = mongoc_client_get_collection(client, "db_ls", "coll_ls"); query = bson_new(); // find db record set name : {first:x, last:cn} bson_append_document_begin(query, "name", -1, &child); BSON_APPEND_UTF8(&child, "first", "lostspeed258"); BSON_APPEND_UTF8(&child, "last", "hk"); bson_append_document_end(query, &child); count = mongoc_collection_count(collection, MONGOC_QUERY_NONE, query, 0, 0, NULL, &error); if (count < 0) { ShowErrMsg("mongoc_collection_count", &error); } else { // PRId64不好使啊, 是不是版本高才好使啊? // 就按照long long 使用吧 uri_str = bson_strdup_printf("mongoc_collection_count = 0x%x\n", (long long)count); printf("%s", uri_str); /** run result mongoc_collection_count = 0x1 */ } bson_free (uri_str); bson_destroy(query); mongoc_collection_destroy(collection); mongoc_client_destroy(client); mongoc_cleanup(); return 0; }