Added code and README

README.md

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+# Hello, MongoC
+
+Some simple examples using the [MongoDB C driver](https://www.mongodb.com/docs/drivers/c/)
+
+## Build and run
+
+These examples are built using GCC on macOS, but they should compile anywhere that has a C compiler
+
+- clone this repo
+- create a file called `URI.h` that contains your MongoDB Connection String, with this content:
+```c
+// URI.h
+#define MY_MONGODB_URI "mongodb+srv://<your connection string, including user + password>" 
+```
+
+- Make the build script executable `chmod a+x build-all.sh`
+- `./build-all.sh`
+
+In macOS you need to install Xcode first (free on the Mac App Store)

bcon.c

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+// bcon.c
+// https://mongoc.org/libmongoc/current/tutorial.html#using-bcon
+#include <mongoc/mongoc.h>
+
+// Creating the JSON doc:
+/*
+{
+   born : ISODate("1906-12-09"),
+   died : ISODate("1992-01-01"),
+   name : {
+      first : "Grace",
+      last : "Hopper"
+   },
+   languages : [ "MATH-MATIC", "FLOW-MATIC", "COBOL" ],
+   degrees: [ { degree: "BA", school: "Vassar" },
+              { degree: "PhD", school: "Yale" } ]
+}
+*/
+
+int main(int argc, char *argv[]) {
+  struct tm born = {0};
+  struct tm died = {0};
+  bson_t *document;
+  char *str;
+
+  born.tm_year = 6;
+  born.tm_mon = 11;
+  born.tm_mday = 9;
+
+  died.tm_year = 92;
+  died.tm_mon = 0;
+  died.tm_mday = 1;
+
+  //   document = BCON_NEW("born", BCON_DATE_TIME(mktime(&born) * 1000),
+  //                       "died", BCON_DATE_TIME(mktime(&died) * 1000),
+  //                       "name", "{",
+  //                         "first", BCON_UTF8("Grace"),
+  //                         "last", BCON_UTF8("Hopper"),
+  //                       "}",
+  //                       "languages", "[",
+  //                         BCON_UTF8("MATH-MATIC"),
+  //                         BCON_UTF8("FLOW-MATIC"),
+  //                         BCON_UTF8("COBOL"),
+  //                       "]",
+  //                       "degrees", "[",
+  //                         "{", "degree", BCON_UTF8("BA"), "school",
+  //                         BCON_UTF8("Vassar"), "}",
+  //                         "{", "degree", BCON_UTF8("PhD"),"school",
+  //                         BCON_UTF8("Yale"), "}",
+  //                       "]");
+
+  document = BCON_NEW("born", BCON_DATE_TIME(mktime(&born) * 1000), "died",
+                      BCON_DATE_TIME(mktime(&died) * 1000), "name", "{",
+                      "first", BCON_UTF8("Grace"), "last", BCON_UTF8("Hopper"),
+                      "}", "languages", "[", BCON_UTF8("MATH-MATIC"),
+                      BCON_UTF8("FLOW-MATIC"), BCON_UTF8("COBOL"), "]",
+                      "degrees", "[", "{", "degree", BCON_UTF8("BA"), "school",
+                      BCON_UTF8("Vassar"), "}", "{", "degree", BCON_UTF8("PhD"),
+                      "school", BCON_UTF8("Yale"), "}", "]");
+
+  /*
+   * Print the document as a JSON string.
+   */
+  str = bson_as_canonical_extended_json(document, NULL);
+  printf("%s\n", str);
+  bson_free(str);
+
+  /*
+   * Clean up allocated bson documents.
+   */
+  bson_destroy(document);
+  return 0;
+}

build-all.sh

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+#!/bin/bash
+
+SOURCE_FILES="insert find bcon list_collections hello_mongoc delete"
+
+mkdir output
+
+echo COMPILING ALL EXAMPLES!
+
+for file in $SOURCE_FILES
+do 
+
+echo "Compiling $file"
+
+gcc -o output/$file $file.c \
+    -I/usr/local/include/libbson-1.0 -I/usr/local/include/libmongoc-1.0 \
+    -lmongoc-1.0 -lbson-1.0 -Wdeprecated-declarations -w
+
+done
+
+echo RUNNING ALL EXAMPLES! 🚀
+
+for file in $SOURCE_FILES
+do 
+
+echo "Running $file"
+echo "-------------"
+
+./output/$file
+
+done

delete.c

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+// delete.c
+#include "URI.h"
+#include <mongoc/mongoc.h>
+
+int main(int argc, char const *argv[]) {
+  // your MongoDB URI connection string
+  const char *uri_string = MY_MONGODB_URI;
+  // MongoDB URI created from above string
+  mongoc_uri_t *uri;
+  // MongoDB Client, used to connect to the DB
+  mongoc_client_t *client;
+
+  // Error management
+  bson_error_t error;
+
+  mongoc_collection_t *collection;
+  char **collection_names;
+  unsigned i;
+
+  // Object id and BSON doc
+  bson_oid_t oid;
+  bson_t *doc;
+
+  char *str;
+
+  /*
+   * Required to initialize libmongoc's internals
+   */
+  mongoc_init();
+
+  /*
+   * Safely create a MongoDB URI object from the given string
+   */
+  uri = mongoc_uri_new_with_error(uri_string, &error);
+  if (!uri) {
+    fprintf(stderr,
+            "failed to parse URI: %s\n"
+            "error message:       %s\n",
+            uri_string, error.message);
+    return EXIT_FAILURE;
+  }
+
+  /*
+   * Create a new client instance, here we use the uri we just built
+   */
+  client = mongoc_client_new_from_uri(uri);
+  if (!client) {
+    return EXIT_FAILURE;
+  }
+
+  /*
+   * Register the application name so we can track it in the profile logs
+   * on the server. This can also be done from the URI (see other examples).
+   */
+  mongoc_client_set_appname(client, "connect-example");
+
+  /*
+   * Get a handle on the database "db_name" and collection "coll_name"
+   */
+  collection = mongoc_client_get_collection(client, "sample_mflix", "movies");
+
+  // Let's insert one document in this collection!
+  doc = bson_new();
+  bson_oid_init(&oid, NULL);
+  BSON_APPEND_OID(doc, "_id", &oid);
+  BSON_APPEND_UTF8(doc, "name", "My super new picture");
+
+  if (!mongoc_collection_insert_one(collection, doc, NULL, NULL, &error)) {
+    fprintf(stderr, "%s\n", error.message);
+  } else {
+    printf("Document inserted!");
+    /*
+     * Print the document as a JSON string.
+     */
+    str = bson_as_canonical_extended_json(doc, NULL);
+    printf("%s\n", str);
+    bson_free(str);
+  }
+
+  bson_destroy(doc);
+
+  // Delete the inserted document!
+
+  doc = bson_new();
+  BSON_APPEND_OID(doc, "_id", &oid);
+
+  if (!mongoc_collection_delete_one(collection, doc, NULL, NULL, &error)) {
+    fprintf(stderr, "Delete failed: %s\n", error.message);
+  } else {
+    puts("Document deleted!");
+  }
+
+  /*
+   * Release our handles and clean up libmongoc
+   */
+
+  mongoc_collection_destroy(collection);
+  mongoc_uri_destroy(uri);
+  mongoc_client_destroy(client);
+  mongoc_cleanup();
+
+  return EXIT_SUCCESS;
+}

find.c

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+// find.c
+#include "URI.h"
+#include <mongoc/mongoc.h>
+
+int main(int argc, char const *argv[]) {
+  // your MongoDB URI connection string
+  const char *uri_string = MY_MONGODB_URI;
+  // MongoDB URI created from above string
+  mongoc_uri_t *uri;
+  // MongoDB Client, used to connect to the DB
+  mongoc_client_t *client;
+
+  // Error management
+  bson_error_t error;
+
+  mongoc_collection_t *collection;
+  char **collection_names;
+  unsigned i;
+
+  // Query object
+  bson_t *query;
+  mongoc_cursor_t *cursor;
+
+  char *str;
+
+  /*
+   * Required to initialize libmongoc's internals
+   */
+  mongoc_init();
+
+  /*
+   * Safely create a MongoDB URI object from the given string
+   */
+  uri = mongoc_uri_new_with_error(uri_string, &error);
+  if (!uri) {
+    fprintf(stderr,
+            "failed to parse URI: %s\n"
+            "error message:       %s\n",
+            uri_string, error.message);
+    return EXIT_FAILURE;
+  }
+
+  /*
+   * Create a new client instance, here we use the uri we just built
+   */
+  client = mongoc_client_new_from_uri(uri);
+  if (!client) {
+    puts("Error connecting!");
+    return EXIT_FAILURE;
+  }
+
+  /*
+   * Register the application name so we can track it in the profile logs
+   * on the server. This can also be done from the URI (see other examples).
+   */
+  mongoc_client_set_appname(client, "connect-example");
+
+  /*
+   * Get a handle on the database "db_name" and collection "coll_name"
+   */
+  collection = mongoc_client_get_collection(client, "sample_mflix", "movies");
+
+  query = bson_new();
+
+  // All movies from 1984!
+  BSON_APPEND_INT32(query, "year", 1984);
+  cursor = mongoc_collection_find_with_opts(collection, query, NULL, NULL);
+
+  while (mongoc_cursor_next(cursor, &query)) {
+    str = bson_as_canonical_extended_json(query, NULL);
+    printf("%s\n", str);
+    bson_free(str);
+  }
+
+  /*
+   * Release our handles and clean up libmongoc
+   */
+
+  bson_destroy(query);
+
+  mongoc_collection_destroy(collection);
+  mongoc_uri_destroy(uri);
+  mongoc_client_destroy(client);
+  mongoc_cleanup();
+
+  return EXIT_SUCCESS;
+}