bson_append_document_end(&child3, &child); cursor= mongoc_collection_find_with_opts(collection_file, query, &child3, NULL); 其中,_id是MongoDB自动添加的id字段, BSON_APPEND_INT32(&child, "_id", 0);中的0,表示不输出。 2、比较 1)不等于:not eq: bson_append_document_begin(&child2,"u...
mongoc_init (); client=mongoc_client_new ("mongodb://localhost:27017/?appname=find-example"); collection= mongoc_client_get_collection (client,"mydb","mycoll"); query=bson_new (); cursor=mongoc_collection_find_with_opts (collection, query, NULL, NULL);while(mongoc_cursor_next (curs...
"testdb","testcollection");bson_t*query=bson_new();// 创建一个空的查询mongoc_cursor_t*cursor;cursor=mongoc_collection_find_with_opts(collection,
在上述代码中,我们首先创建了一个查询条件query,然后使用mongoc_collection_find_with_opts函数执行查询操作,并将结果保存在cursor中。接着,我们使用mongoc_cursor_next函数遍历cursor,并通过bson_as_canonical_extended_json函数将找到的文档转换为字符串进行打印。最后,记得释放资源。 Mongo C驱动是MongoDB官方提供的C...
bson_t*query;mongoc_cursor_t*cursor;constbson_t*doc;/* 创建查询文档 */query=bson_new();/* 执行查询 */cursor=mongoc_collection_find_with_opts(collection,query,NULL,NULL);/* 遍历结果集 */while(mongoc_cursor_next(cursor,&doc)){/* 处理结果 */}/* 释放资源 */bson_destroy(query);mong...
文档的结构如下: name: "TestName" data:["testData1","testData2"]; 我检索到的文档如下: cursor = mongoc_collection_find_with_opts(collection, query, NULL, NULL); while (mongoc_cursor_next(cursor, &document)) { str = (const unsigned char *)bson_as_canonical_ 浏览106提问于2020-06-17...
*/intreadCollection(MongoContext* mctx) { mongoc_cursor_t* cursor;constbson_t* doc; char* str; bson_t* query =bson_new(); cursor =mongoc_collection_find_with_opts(mctx->collection, query,NULL,NULL);if(cursor ==NULL) {fprintf(stderr,"readCollection(): Unable to retrieve...
mongoc_collection_read_write_command_with_opts mongoc_gridfs_find_with_opts mongoc_gridfs_find_one_with_opts mongoc_bulk_operation_remove_one_with_opts mongoc_bulk_operation_remove_many_with_opts mongoc_bulk_operation_replace_one_with_opts mongoc_bulk_operation_update_one_with_opts mongoc_...
cursor=mongoc_collection_find_with_opts(collection,query,NULL,NULL); constbson_t*doc; while(mongoc_cursor_next(cursor,&doc)){ char*str=bson_as_canonical_extended_json(doc,NULL); printf("%s\n",str); bson_free(str); } if(mongoc_cursor_error(cursor,&error)){ ...
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