Updating Array in MongoDB New C Driver

Question

Until Last month, I was using Legacy C Driver but from last week i shifted to the new C Driver, which looks quite good and easy to use. I saved a document in the DB like which have 3 strings, 2 integers and 2 arrays. Now i want to update this array. I am trying like this,

update_mod = BCON_NEW ("$set", "{",
                           "Int1", BCON_INT32 (23),
                           "Int2",BCON_INT32(34),
                           "String1",BCON_UTF8("String1"),
                           "String2", BCON_UTF8("String2"),
                           "String3",BCON_UTF8("String3"),
                           "Array1", BCON_ARRAY(&Array1),
                           "Array2", BCON_ARRAY(&Array2),
                       "}");
            }

But it's not working, if i try to update it without Array then it's working perfectly. Can anyone tell me how i can do this. and also i want to save multiple values in Array for each update.

fmcato · Accepted Answer · 2014-08-14 12:51:49Z

1

BCON_ARRAY uses as input a list of args, not a pointer to an array. You should use something like:

BCON_ARRAY( Array1[0], Array1[1], ...);

answered Aug 14, 2014 at 12:51

fmcato

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1 Comment

user63898 Over a year ago

how can i pass full array , as i dont know how many elements i have im converting vector to array

Umakant · Accepted Answer · 2021-07-06 19:34:52Z

0

You can pass a variable of type bson_t to BCON_ARRAY. So, first you will create a BCON_DOCUMENT from your array and then you can pass that document as an input to BCON_ARRAY; something like below:

bson_error_t error;
bson_t *bson_array_doc = bson_new_from_json((const uint8_t *)my_array_str, -1, &error);
bson_t *bson_doc = BCON_NEW("$set", "{", "my_array", BCON_ARRAY(bson_array_doc), "}");

answered Jul 6, 2021 at 19:34

Umakant

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