SYNOPSIS
#include <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.
NOTE
- 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.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; }