C language programming example of MongoDB in Linux

C language programming example of MongoDB in Linux

The following describes the C language programming example of MongoDB on the Linux platform.

Assume that MongoDB has been installed.

1. download and install the MongoDB C language driver

Here the downloaded MongoDB C language driver is mongo-c-driver-1.3.5.tar.gz.

Decompress the package and open the README file in the mongo-c-driver-1.3.5 directory. Install it as follows:

# Tar xzf mongo-c-driver-1.3.5.tar.gz
# Cd mongo-c-driver-1.3.5
#./Configure
# Make
# Sudo make install

2. Start MongoDB

# Mongod
2016-07-10T11: 53: 20.075 + 0800 I CONTROL [initandlisten] MongoDB starting: pid = 3071 port = 27017 dbpath =/data/db 64-bit host = localhost. localdomain
2016-07-10T11: 53: 20.076 + 0800 I CONTROL [initandlisten] db version v3.2.7
2016-07-10T11: 53: 20.076 + 0800 I CONTROL [initandlisten] git version: rj9c1d2b5999ebbf1fdf3bc0e0e3b3ff5c0aaf2
...

3. Write the MongoDB Connection Program test. c.

# Include <bson. h>
# Include <bcon. h>
# Include <20.c. h>
Int
Main (int argc,
Char * argv [])
{
C_c_client_t * client;
C_c_database_t * database;
C_c_collection_t * collection;
Bson_t * command,
Reply,
* Insert;
Bson_error_t error;
Char * str;
Bool retval;
/*
* Required to initialize lib1_c's internals
*/
C_c_init (); // initialize the lib1_c driver
/*
* Create a new client instance
*/
Client = c_c_client_new ("mongodb: // localhost: 27017"); // create a connection object
/*
* Get a handle on the database "db_name" and collection "coll_name"
*/
Database = c_c_client_get_database (client, "db_name"); // obtain the database
Collection = c_c_client_get_collection (client, "db_name", "coll_name"); // obtain the specified database and set
/*
* Do work. This example pings the database, prints the result as JSON and
* Performs an insert
*/
Command = BCON_NEW ("ping", BCON_INT32 (1 ));
Retval = c_c_client_command_simple (client, "admin", command, NULL, & reply, & error); // execute the command
If (! Retval ){
Fprintf (stderr, "% s \ n", error. message );
Return EXIT_FAILURE;
}
Str = bson_as_json (& reply, NULL );
Printf ("% s \ n", str );
Insert = BCON_NEW ("hello", BCON_UTF8 ("world"); // The field is hello and the value is a world string.
If (! C_c_collection_insert (collection, c_c_insert_none, insert, NULL, & error) {// insert a document
Fprintf (stderr, "% s \ n", error. message );
}
Bson_destroy (insert );
Bson_destroy (& reply );
Bson_destroy (command );
Bson_free (str );
/*
* Release our handles and clean up libw.c
*/
C_c_collection_destroy (collection); // release the table object
Export c_database_destroy (database); // release the database object
C_c_client_destroy (client); // release the connection object
C_c_cleanup (); // release the lib1_c driver
Return 0;
} 4. compile test. c

# Gcc-o test. c-I/usr/local/include/libmongoc-1.0-I/usr/local/include/libbson-1.0/-lmongoc-1.0-lbson-1.0

# Ls
Test. c

5. Run test

#./Test
{"OK": 1}

MongoDB connection successful!

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MongoDB authoritative Guide (The Definitive Guide) in English [PDF]

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