libmemcached_examples(3) Examples for libmemcached


For full examples, test cases are found in tests/*.c in the main distribution. These are always up to date, and are used for each test run of the library.

Creating and Freeing structure

  memcached_st *memc;
  memcached_return_t rc;
  memc= memcached_create(NULL); stuff...

The above code would create a connection and then free the connection when finished.

Connecting to servers

  memcached_server_st *servers;
  memcached_st *memc= memcached_create(NULL);
  char servername[]= "";
  servers= memcached_server_list_append(NULL, servername, 400, &rc);
  for (x= 0; x < 20; x++)
    char buffer[SMALL_STRING_LEN];
    snprintf(buffer, SMALL_STRING_LEN, "", 400+x);
    servers= memcached_server_list_append(servers, buffer, 401, &rc);
  rc= memcached_server_push(memc, servers);

In the above code you create a "memcached_st" object that you then feed in a single host into. In the for loop you build a "memcached_server_st" pointer that you then later feed via memcached_server_push() into the "memcached_st" structure.

You can reuse the "memcached_server_st" object with multile "memcached_st" structures.

Adding a value to the server

  char *key= "foo";
  char *value;
  size_t value_length= 8191;
  unsigned int x;
  value = (char*)malloc(value_length);
  for (x= 0; x < value_length; x++)
  value[x] = (char) (x % 127);
  for (x= 0; x < 1; x++)
    rc= memcached_set(memc, key, strlen(key), 
    value, value_length,
    (time_t)0, (uint32_t)0);
    assert(rc == MEMCACHED_SUCCESS);

It is best practice to always look at the return value of any operation.

Fetching multiple values

  memcached_return_t rc;
  char *keys[]= {"fudge", "son", "food"};
  size_t key_length[]= {5, 3, 4};
  unsigned int x;
  uint32_t flags;
  char return_key[MEMCACHED_MAX_KEY];
  size_t return_key_length;
  char *return_value;
  size_t return_value_length;
  rc= memcached_mget(memc, keys, key_length, 3);
  x= 0;
  while ((return_value= memcached_fetch(memc, return_key, &return_key_length, 
                                        &return_value_length, &flags, &rc)))

Notice that you freed values returned from memcached_fetch(). The define "MEMCACHED_MAX_KEY" is provided for usage.


To find out more information please check: <>


Brian Aker, <[email protected]>