libmemcached_examples.pop(3)

NAME

libmemcached_examples - Examples for libmemcached

DESCRIPTION

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);
...do stuff...
memcached_free(memc);

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[]= "0.example.com";

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, "%u.example.com", 400+x);
servers= memcached_server_list_append(servers, buffer, 401, &rc);

}
rc= memcached_server_push(memc, servers);
memcached_server_free(servers);
memcached_free(memc);

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);
assert(value);

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);

}

free(value);

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)))

{

free(return_value);
x++;

}

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

HOME

To find out more information please check:
<https://launchpad.net/libmemcached>

AUTHOR

Brian Aker, <brian@tangent.org>

SEE ALSO

memcached(1)

2010-01-07 libmemcached_examples.pop(3)