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前言

按照mongoc说明书, 做个mongoc_collection_count试验.

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;}

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