libmemcached_examples (3) - Linux Manuals

libmemcached_examples: libmemcached Documentation

NAME

libmemcached_examples - libmemcached Documentation

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.

CONNECTING TO SERVERS

const char *config_string= "--SERVER=host10.example.com --SERVER=host11.example.com --SERVER=host10.example.com"
memcached_st *memc= memcached(config_string, strlen(config_string);
{
...
}
 memcached_free(memc);

In the above code you create a memcached_st object with three server by making use of memcached_create().

CREATING A POOL OF SERVERS

Creating a pool of Servers:

const char *config_string= "--SERVER=host10.example.com --SERVER=host11.example.com --SERVER=host10.example.com";

memcached_pool_st* pool= memcached_pool(config_string, strlen(config_string));

memcached_return_t rc;

memcached_st *memc= memcached_pool_pop(pool, false, &rc);

.... do work

/*
  Release the memc_ptr that was pulled from the pool
*/
memcached_pool_push(pool, memc);

/*
  Destroy the pool.
*/
memcached_pool_destroy(pool);

In the above code you create a memcached_pool_st object with three server by making use of memcached_pool().

When memcached_pool_destroy() all memory will be released that is associated with the pool.

ADDING A VALUE TO THE SERVER

Adding a value to the Server:

char *key= "foo";
char *value= "value";

memcached_return_t rc= memcached_set(memc, key, strlen(key), value, value_length, (time_t)0, (uint32_t)0);

if (rc != MEMCACHED_SUCCESS)
{
... // handle failure
}

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: http://libmemcached.org/

AUTHOR

Brian Aker

COPYRIGHT

2011-2013, Brian Aker DataDifferential, http://datadifferential.com/