LIBMEMCACHED_EXAMPLES(3)

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 <#_CPPv412memcached_st> object with three server by making use of memcached_create() <#_CPPv416memcached_createP12memcached_st>.

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 <#_CPPv417memcached_pool_st> object with three server by making use of memcached_pool() <#_CPPv414memcached_poolPKc6size_t>.

When memcached_pool_destroy() <#_CPPv422memcached_pool_destroyP17memcached_pool_st> all memory will be released that is associated with the pool.

ADDING A VALUE TO THE SERVER

            char *key= "foo";
            char *value= "value";
            time_t expires = 0;
            uint32_t flags = 0;

            memcached_return_t rc = memcached_set(memc,
                                                 key, strlen(key),
                                                 value, value_length,
                                                 expires, flags);

            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.

SEE ALSO
        memcached(1) <https://linux.die.net/man/1/memcached>