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BSON_JSON_READER_T(3) libbson BSON_JSON_READER_T(3)

NAME

bson_json_reader_t - bson_json_reader_t

Bulk JSON to BSON conversion

SYNOPSIS

#include <bson/bson.h>
typedef struct _bson_json_reader_t bson_json_reader_t;
typedef enum {

BSON_JSON_ERROR_READ_CORRUPT_JS = 1,
BSON_JSON_ERROR_READ_INVALID_PARAM,
BSON_JSON_ERROR_READ_CB_FAILURE, } bson_json_error_code_t;


DESCRIPTION

The bson_json_reader_t structure is used for reading a sequence of JSON documents and transforming them to bson_t documents.

This can often be useful if you want to perform bulk operations that are defined in a file containing JSON documents.

TIP:

bson_json_reader_t works upon JSON documents formatted in MongoDB extended JSON format.


EXAMPLE

/*

* Copyright 2013 MongoDB, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/ /*
* This program will print each JSON document contained in the provided files
* as a BSON string to STDOUT.
*/ #include <bson/bson.h> #include <stdlib.h> #include <stdio.h> int main (int argc, char *argv[]) {
bson_json_reader_t *reader;
bson_error_t error;
const char *filename;
bson_t doc = BSON_INITIALIZER;
int i;
int b;
/*
* Print program usage if no arguments are provided.
*/
if (argc == 1) {
fprintf (stderr, "usage: %s FILE...\n", argv[0]);
return 1;
}
/*
* Process command line arguments expecting each to be a filename.
*/
for (i = 1; i < argc; i++) {
filename = argv[i];
/*
* Open the filename provided in command line arguments.
*/
if (0 == strcmp (filename, "-")) {
reader = bson_json_reader_new_from_fd (STDIN_FILENO, false);
} else {
if (!(reader = bson_json_reader_new_from_file (filename, &error))) {
fprintf (
stderr, "Failed to open \"%s\": %s\n", filename, error.message);
continue;
}
}
/*
* Convert each incoming document to BSON and print to stdout.
*/
while ((b = bson_json_reader_read (reader, &doc, &error))) {
if (b < 0) {
fprintf (stderr, "Error in json parsing:\n%s\n", error.message);
abort ();
}
if (fwrite (bson_get_data (&doc), 1, doc.len, stdout) != doc.len) {
fprintf (stderr, "Failed to write to stdout, exiting.\n");
exit (1);
}
bson_reinit (&doc);
}
bson_json_reader_destroy (reader);
bson_destroy (&doc);
}
return 0; }


AUTHOR

MongoDB, Inc

COPYRIGHT

2017-present, MongoDB, Inc

August 31, 2022 1.23.0