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>