MongoDB C++ gridfs worked example-白红宇

MongoDB C++ gridfs worked example

阅读量：6607 次

发布时间：2019-06-24

本文共 1612 字，大约阅读时间需要 5 分钟。

使用libmongoc，参考：http://mongoc.org/libmongoc/current/mongoc_gridfs_t.html

#include 
     
      #include 
      
       #include 
       
        #include 
        
         class MongoGridFS {public:    MongoGridFS(const char* db);    ~MongoGridFS();    void saveFile(const char* input_file_path, const char* filename);private:    mongoc_gridfs_t *gridfs;    mongoc_client_t *client;};MongoGridFS::MongoGridFS(const char* db) {    assert(db != NULL);    mongoc_init ();    /* connect to localhost client */    client = mongoc_client_new ("mongodb://127.0.0.1:27017?appname=gridfs-example");    assert (client);    mongoc_client_set_error_api (client, 2);    /* grab a gridfs handle in test prefixed by fs */    bson_error_t error;    gridfs = mongoc_client_get_gridfs (client, db, "fs", &error);    assert (gridfs);}void MongoGridFS::saveFile(const char* input_file_path, const char* filename) {    assert(input_file_path != NULL && filename != NULL);    mongoc_stream_t *stream = mongoc_stream_file_new_for_path (input_file_path, O_RDONLY, 0);    assert (stream);    mongoc_gridfs_file_opt_t opt = {
   0};    opt.filename = filename;    /* the driver generates a file_id for you */    mongoc_gridfs_file_t *file = mongoc_gridfs_create_file_from_stream (gridfs, stream, &opt);    assert (file);    mongoc_gridfs_file_save (file);    mongoc_gridfs_file_destroy (file);}MongoGridFS::~MongoGridFS() {     mongoc_gridfs_destroy (gridfs);     mongoc_client_destroy (client);     mongoc_cleanup ();}intmain (int argc, char *argv[]){    MongoGridFS gridfs("test2gridfs");    gridfs.saveFile("test.py", "test.py");    return 0;}