git.m6w6.name Git - awesomized/libmemcached/blob - docs/libmemcached_examples.pod

   1 =head1 NAME
   2
   3 libmemcached_examples - Examples for libmemcached
   4
   5 =head1 DESCRIPTION
   6
   7 For full examples, test cases are found in tests/*.c in the main
   8 distribution. These are always up to date, and are used for each test run of
   9 the library.
  10
  11 =head2 Creating and Freeing structure
  12
  13   memcached_st *memc;
  14   memcached_return_t rc;
  15
  16   memc= memcached_create(NULL);
  17   ...do stuff...
  18   memcached_free(memc);
  19
  20 The above code would create a connection and then free the connection when
  21 finished.
  22
  23 =head2 Connecting to servers
  24
  25   memcached_server_st *servers;
  26   memcached_st *memc= memcached_create(NULL);
  27   char servername[]= "0.example.com";
  28
  29   servers= memcached_server_list_append(NULL, servername, 400, &rc);
  30
  31   for (x= 0; x < 20; x++)
  32   {
  33     char buffer[SMALL_STRING_LEN];
  34
  35     snprintf(buffer, SMALL_STRING_LEN, "%u.example.com", 400+x);
  36     servers= memcached_server_list_append(servers, buffer, 401, &rc);
  37   }
  38   rc= memcached_server_push(memc, servers);
  39   memcached_server_free(servers);
  40   memcached_free(memc);
  41
  42 In the above code you create a C<memcached_st> object that you then feed in a
  43 single host into. In the for loop you build a C<memcached_server_st>
  44 pointer that you then later feed via memcached_server_push() into the
  45 C<memcached_st> structure.
  46
  47 You can reuse the C<memcached_server_st> object with multile C<memcached_st>
  48 structures.
  49
  50 =head2 Adding a value to the server
  51
  52   char *key= "foo";
  53   char *value;
  54   size_t value_length= 8191;
  55   unsigned int x;
  56
  57   value = (char*)malloc(value_length);
  58   assert(value);
  59
  60   for (x= 0; x < value_length; x++)
  61   value[x] = (char) (x % 127);
  62
  63   for (x= 0; x < 1; x++)
  64   {
  65     rc= memcached_set(memc, key, strlen(key),
  66     value, value_length,
  67     (time_t)0, (uint32_t)0);
  68     assert(rc == MEMCACHED_SUCCESS);
  69   }
  70
  71   free(value);
  72
  73 It is best practice to always look at the return value of any operation.
  74
  75 =head2 Fetching multiple values
  76
  77   memcached_return_t rc;
  78   char *keys[]= {"fudge", "son", "food"};
  79   size_t key_length[]= {5, 3, 4};
  80   unsigned int x;
  81   uint32_t flags;
  82
  83   char return_key[MEMCACHED_MAX_KEY];
  84   size_t return_key_length;
  85   char *return_value;
  86   size_t return_value_length;
  87
  88   rc= memcached_mget(memc, keys, key_length, 3);
  89
  90   x= 0;
  91   while ((return_value= memcached_fetch(memc, return_key, &return_key_length,
  92                                         &return_value_length, &flags, &rc)))
  93   {
  94     free(return_value);
  95     x++;
  96   }
  97
  98 Notice that you freed values returned from memcached_fetch(). The define
  99 C<MEMCACHED_MAX_KEY> is provided for usage.
 100
 101 =head1 HOME
 102
 103 To find out more information please check:
 104 L<https://launchpad.net/libmemcached>
 105
 106 =head1 AUTHOR
 107
 108 Brian Aker, E<lt>brian@tangent.orgE<gt>
 109
 110 =head1 SEE ALSO
 111
 112 memcached(1)
 113
 114 =cut
 115