mongoc_find_and_modify_opts_t (3) - Linux Manuals

mongoc_find_and_modify_opts_t: find_and_modify abstraction

Command to display mongoc_find_and_modify_opts_t manual in Linux: $ man 3 mongoc_find_and_modify_opts_t

NAME

mongoc_find_and_modify_opts_t - find_and_modify abstraction

SYNOPSIS

mongoc_find_and_modify_opts_t is a builder interface to construct a find_and_modify command.

It was created to be able to accommodate new arguments to the MongoDB find_and_modify command.

NOTE

: New in mongoc 1.3.0

NOTE

: As of MongoDB 3.2, the mongoc_write_concern_t specified on the mongoc_collection_t will be used, if any.

EXAMPLE

void fam_flags(mongoc_collection_t *collection)
{
   mongoc_find_and_modify_opts_t *opts;
   bson_t reply;
   bson_error_t error;
   bson_t query = BSON_INITIALIZER;
   bson_t *update;
   bool success;


   /* Find Zlatan Ibrahimovic, the striker */
   BSON_APPEND_UTF8 (&query, "firstname", "Zlatan");
   BSON_APPEND_UTF8 (&query, "lastname", "Ibrahimovic");
   BSON_APPEND_UTF8 (&query, "profession", "Football player");
   BSON_APPEND_INT32 (&query, "age", 34);
   BSON_APPEND_INT32 (&query, "goals", (16+35+23+57+16+14+28+84)+(1+6+62));

   /* Add his football position */
   update = BCON_NEW ("$set", "{",
      "position", BCON_UTF8 ("striker"),
   "}");

   opts = mongoc_find_and_modify_opts_new ();

   mongoc_find_and_modify_opts_set_update (opts, update);

   /* Create the document if it didn't exist, and return the updated document */
   mongoc_find_and_modify_opts_set_flags (opts, MONGOC_FIND_AND_MODIFY_UPSERT|MONGOC_FIND_AND_MODIFY_RETURN_NEW);

   success = mongoc_collection_find_and_modify_with_opts (collection, &query, opts, &reply, &error);

   if (success) {
      char *str;

      str = bson_as_json (&reply, NULL);
      printf ("%s\n", str);
      bson_free (str);
   } else {
      fprintf(stderr, "Got error: \"%s\" on line %d\n", error.message, __LINE__);
   }

   bson_destroy (&reply);
   bson_destroy (update);
   bson_destroy (&query);
   mongoc_find_and_modify_opts_destroy (opts);
}

void fam_bypass(mongoc_collection_t *collection)
{
   mongoc_find_and_modify_opts_t *opts;
   bson_t reply;
   bson_t *update;
   bson_error_t error;
   bson_t query = BSON_INITIALIZER;
   bool success;


   /* Find Zlatan Ibrahimovic, the striker */
   BSON_APPEND_UTF8 (&query, "firstname", "Zlatan");
   BSON_APPEND_UTF8 (&query, "lastname", "Ibrahimovic");
   BSON_APPEND_UTF8 (&query, "profession", "Football player");

   /* Bump his age */
   update = BCON_NEW ("$inc", "{",
      "age", BCON_INT32 (1),
   "}");

   opts = mongoc_find_and_modify_opts_new ();
   mongoc_find_and_modify_opts_set_update (opts, update);
   /* He can still play, even though he is pretty old. */
   mongoc_find_and_modify_opts_set_bypass_document_validation (opts, true);

   success = mongoc_collection_find_and_modify_with_opts (collection, &query, opts, &reply, &error);

   if (success) {
      char *str;

      str = bson_as_json (&reply, NULL);
      printf ("%s\n", str);
      bson_free (str);
   } else {
      fprintf(stderr, "Got error: \"%s\" on line %d\n", error.message, __LINE__);
   }

   bson_destroy (&reply);
   bson_destroy (update);
   bson_destroy (&query);
   mongoc_find_and_modify_opts_destroy (opts);
}

void fam_update(mongoc_collection_t *collection)
{
   mongoc_find_and_modify_opts_t *opts;
   bson_t *update;
   bson_t reply;
   bson_error_t error;
   bson_t query = BSON_INITIALIZER;
   bool success;


   /* Find Zlatan Ibrahimovic */
   BSON_APPEND_UTF8 (&query, "firstname", "Zlatan");
   BSON_APPEND_UTF8 (&query, "lastname", "Ibrahimovic");

   /* Make him a book author */
   update = BCON_NEW ("$set", "{",
      "author", BCON_BOOL (true),
   "}");

   opts = mongoc_find_and_modify_opts_new ();
   /* Note that the document returned is the _previous_ version of the document
    * To fetch the modified new version, use
    * mongoc_find_and_modify_opts_set_flags (opts, MONGOC_FIND_AND_MODIFY_RETURN_NEW);
    */
   mongoc_find_and_modify_opts_set_update (opts, update);

   success = mongoc_collection_find_and_modify_with_opts (collection, &query, opts, &reply, &error);

   if (success) {
      char *str;

      str = bson_as_json (&reply, NULL);
      printf ("%s\n", str);
      bson_free (str);
   } else {
      fprintf(stderr, "Got error: \"%s\" on line %d\n", error.message, __LINE__);
   }

   bson_destroy (&reply);
   bson_destroy (update);
   bson_destroy (&query);
   mongoc_find_and_modify_opts_destroy (opts);
}

void fam_fields(mongoc_collection_t *collection)
{
   mongoc_find_and_modify_opts_t *opts;
   bson_t fields = BSON_INITIALIZER;
   bson_t *update;
   bson_t reply;
   bson_error_t error;
   bson_t query = BSON_INITIALIZER;
   bool success;


   /* Find Zlatan Ibrahimovic */
   BSON_APPEND_UTF8 (&query, "lastname", "Ibrahimovic");
   BSON_APPEND_UTF8 (&query, "firstname", "Zlatan");

   /* Return his goal tally */
   BSON_APPEND_INT32 (&fields, "goals", 1);

   /* Bump his goal tally */
   update = BCON_NEW ("$inc", "{",
      "goals", BCON_INT32 (1),
   "}");

   opts = mongoc_find_and_modify_opts_new ();
   mongoc_find_and_modify_opts_set_update (opts, update);
   mongoc_find_and_modify_opts_set_fields (opts, &fields);
   /* Return the new tally */
   mongoc_find_and_modify_opts_set_flags (opts, MONGOC_FIND_AND_MODIFY_RETURN_NEW);

   success = mongoc_collection_find_and_modify_with_opts (collection, &query, opts, &reply, &error);

   if (success) {
      char *str;

      str = bson_as_json (&reply, NULL);
      printf ("%s\n", str);
      bson_free (str);
   } else {
      fprintf(stderr, "Got error: \"%s\" on line %d\n", error.message, __LINE__);
   }

   bson_destroy (&reply);
   bson_destroy (update);
   bson_destroy (&fields);
   bson_destroy (&query);
   mongoc_find_and_modify_opts_destroy (opts);
}

void fam_sort(mongoc_collection_t *collection)
{
   mongoc_find_and_modify_opts_t *opts;
   bson_t *update;
   bson_t sort = BSON_INITIALIZER;
   bson_t reply;
   bson_error_t error;
   bson_t query = BSON_INITIALIZER;
   bool success;


   /* Find all users with the lastname Ibrahimovic */
   BSON_APPEND_UTF8 (&query, "lastname", "Ibrahimovic");

   /* Sort by age (descending) */
   BSON_APPEND_INT32 (&sort, "age", -1);

   /* Bump his goal tally */
   update = BCON_NEW ("$set", "{",
      "oldest", BCON_BOOL (true),
   "}");

   opts = mongoc_find_and_modify_opts_new ();
   mongoc_find_and_modify_opts_set_update (opts, update);
   mongoc_find_and_modify_opts_set_sort (opts, &sort);

   success = mongoc_collection_find_and_modify_with_opts (collection, &query, opts, &reply, &error);

   if (success) {
      char *str;

      str = bson_as_json (&reply, NULL);
      printf ("%s\n", str);
      bson_free (str);
   } else {
      fprintf(stderr, "Got error: \"%s\" on line %d\n", error.message, __LINE__);
   }

   bson_destroy (&reply);
   bson_destroy (update);
   bson_destroy (&sort);
   bson_destroy (&query);
   mongoc_find_and_modify_opts_destroy (opts);
}

#include <bcon.h>
#include <mongoc.h>

#include "flags.c"
#include "bypass.c"
#include "update.c"
#include "fields.c"
#include "sort.c"

int main(void)
{
   mongoc_collection_t *collection;
   mongoc_database_t *database;
   mongoc_client_t *client;
   bson_error_t error;
   bson_t *options;

   client = mongoc_client_new ("mongodb://localhost:27017/admin");
   database = mongoc_client_get_database (client, "databaseName");

   options = BCON_NEW ( "validator", "{", "age", "{", "$lte", BCON_INT32 (34), "}", "}", "validationAction", BCON_UTF8 ("error"), "validationLevel", BCON_UTF8 ("moderate"));

   collection = mongoc_database_create_collection (database, "collectionName", options, &error);
   if (!collection) {
      fprintf(stderr, "Got error: \"%s\" on line %d\n", error.message, __LINE__);
      return 1;
   }

   fam_flags (collection);
   fam_bypass (collection);
   fam_update (collection);
   fam_fields (collection);
   fam_sort (collection);

   mongoc_collection_drop (collection, NULL);
   bson_destroy (options);
   mongoc_database_destroy (database);
   mongoc_collection_destroy (collection);
   mongoc_client_destroy (client);

   return 0;
}

Outputs:

{
    "lastErrorObject": {
        "updatedExisting": false,
        "n": 1,
        "upserted": {
            "$oid": "56562a99d13e6d86239c7b00"
        }
    },
    "value": {
        "_id": {
            "$oid": "56562a99d13e6d86239c7b00"
        },
        "age": 34,
        "firstname": "Zlatan",
        "goals": 342,
        "lastname": "Ibrahimovic",
        "profession": "Football player",
        "position": "striker"
    },
    "ok": 1
}
{
    "lastErrorObject": {
        "updatedExisting": true,
        "n": 1
    },
    "value": {
        "_id": {
            "$oid": "56562a99d13e6d86239c7b00"
        },
        "age": 34,
        "firstname": "Zlatan",
        "goals": 342,
        "lastname": "Ibrahimovic",
        "profession": "Football player",
        "position": "striker"
    },
    "ok": 1
}
{
    "lastErrorObject": {
        "updatedExisting": true,
        "n": 1
    },
    "value": {
        "_id": {
            "$oid": "56562a99d13e6d86239c7b00"
        },
        "age": 35,
        "firstname": "Zlatan",
        "goals": 342,
        "lastname": "Ibrahimovic",
        "profession": "Football player",
        "position": "striker"
    },
    "ok": 1
}
{
    "lastErrorObject": {
        "updatedExisting": true,
        "n": 1
    },
    "value": {
        "_id": {
            "$oid": "56562a99d13e6d86239c7b00"
        },
        "goals": 343
    },
    "ok": 1
}
{
    "lastErrorObject": {
        "updatedExisting": true,
        "n": 1
    },
    "value": {
        "_id": {
            "$oid": "56562a99d13e6d86239c7b00"
        },
        "age": 35,
        "firstname": "Zlatan",
        "goals": 343,
        "lastname": "Ibrahimovic",
        "profession": "Football player",
        "position": "striker",
        "author": true
    },
    "ok": 1
}

COLOPHON

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