git.m6w6.name Git - awesomized/libmemcached/blob - libmemcached/memcached_fetch.rst

   1 memcached_fetch
   2 =================
   3
   4 SYNOPSIS
   5 --------
   6
   7 #include <libmemcached/memcached.h>
   8     Compile and link with -lmemcached
   9
  10 .. function::  char *memcached_fetch(memcached_st *ptr, char *key, size_t *key_length, size_t *value_length, uint32_t *flags, memcached_return_t *error)
  11
  12    .. deprecated:: 0.50
  13       Use :func:`memcached_fetch_result` instead.
  14
  15
  16 DESCRIPTION
  17 -----------
  18
  19 :func:`memcached_fetch` is used to fetch an individual value from the server.
  20 :func:`memcached_mget` must always be called before using this method.
  21 You must pass in a key and its length to fetch the object.
  22
  23 You must supply three pointer variables which will give you the state of the returned
  24 object:
  25
  26     * A :type:`uint32_t` pointer to contain whatever flags you stored with the value,
  27     * a :type:`size_t` pointer which will be filled with size of of the object, and
  28     * a :type:`memcached_return_t` pointer to hold any error.
  29
  30 The object will be returned upon success and NULL will be returned on failure.
  31
  32 `MEMCACHED_END` is returned by the error value when all objects that have been found are returned.
  33 The final value upon `MEMCACHED_END` is a NULL pointer.
  34
  35 Values returned by :func:`memcached_fetch` must be freed by the caller.
  36
  37 All of the above functions are not tested when the
  38 `MEMCACHED_BEHAVIOR_USE_UDP` has been set. Executing any of these
  39 functions with this behavior on will result in `MEMCACHED_NOT_SUPPORTED`
  40 being returned, or for those functions which do not return a
  41 :type:`memcached_return_t`, the error function parameter will
  42 be set to `MEMCACHED_NOT_SUPPORTED`.
  43
  44 RETURN VALUE
  45 ------------
  46
  47 :func:`memcached_fetch` sets error to
  48 to `MEMCACHED_END` upon successful conclusion.
  49
  50 `MEMCACHED_NOTFOUND` will be return if no keys at all were found.
  51
  52 `MEMCACHED_KEY_TOO_BIG` is set to error whenever :func:`memcached_fetch` was used
  53 and the key was set larger then `MEMCACHED_MAX_KEY`, which was the largest
  54 key allowed for the original memcached ascii server.
  55
  56 SEE ALSO
  57 --------
  58
  59 .. only:: man
  60
  61     :manpage:`memcached(1)`
  62     :manpage:`libmemcached(3)`
  63     :manpage:`memcached_strerror(3)`
  64     :manpage:`memcached_fetch_result(3)`
  65
  66 .. only:: html
  67
  68     * :manpage:`memcached(1)`
  69     * :doc:`../libmemcached`
  70     * :doc:`memcached_strerror`
  71     * :doc:`memcached_get`