git.m6w6.name Git - m6w6/libmemcached/blob - docs/memcached_result_st.pod

   1 =head1 NAME
   2
   3 memcached_result_create, memcached_result_free,
   4 memcached_result_key_value, memcached_result_key_length,
   5 memcached_result_value, memcached_result_length,
   6 memcached_result_flags, memcached_result_cas - Work with memcached_result_st
   7
   8
   9 =head1 LIBRARY
  10
  11 C Client Library for memcached (libmemcached, -lmemcached)
  12
  13 =head1 SYNOPSIS
  14
  15   #include <memcached.h>
  16
  17   memcached_result_st *
  18     memcached_result_create (memcached_st *ptr,
  19                              memcached_result_st *result);
  20
  21   void memcached_result_free (memcached_result_st *result);
  22
  23   const char * memcached_result_key_value (memcached_result_st *result);
  24
  25   size_t memcached_result_key_length (const memcached_result_st *result);
  26
  27   const char *memcached_result_value (memcached_result_st *ptr);
  28
  29   size_t memcached_result_length (const memcached_result_st *ptr);
  30
  31   uint32_t memcached_result_flags (const memcached_result_st *result)
  32
  33   uint64_t memcached_result_cas (const memcached_result_st *result);
  34
  35   memcached_return_t
  36     memcached_result_set_value (memcached_result_st *ptr,
  37                                 const char *value, size_t length)
  38
  39   void memcached_result_set_flags (memcached_result_st *ptr, uint32_t flags)
  40
  41   void memcached_result_set_expiration (memcached_result_st *ptr, time_t)
  42
  43 =head1 DESCRIPTION
  44
  45 libmemcached(3) can optionally return a memcached_result_st which acts as a
  46 result object. The result objects have added benefits over the character
  47 pointer returns in that they are forward compatible with new return items
  48 that future memcached servers may implement (the best current example of
  49 this is the CAS return item). The structures can also be reused which will
  50 save on calls to malloc(3). It is suggested that you use result objects over
  51 char * return functions.
  52
  53 The structure of memcached_result_st has been encapsulated, you should not
  54 write code to directly access members of the structure.
  55
  56 memcached_result_create() will either allocate memory for a
  57 memcached_result_st or will initialize a structure passed to it.
  58
  59 memcached_result_free() will deallocate any memory attached to the
  60 structure. If the structure was also alloacted, it will deallocate it.
  61
  62 memcached_result_key_value() returns the key value associated with the
  63 current result object.
  64
  65 memcached_result_key_length() returns the key length associated with the
  66 current result object.
  67
  68 memcached_result_value() returns the result value associated with the
  69 current result object.
  70
  71 memcached_result_length() returns the result length associated with the
  72 current result object.
  73
  74 memcached_result_flags() returns the flags associated with the
  75 current result object.
  76
  77 memcached_result_cas() returns the cas associated with the
  78 current result object. This value will only be available if the server
  79 supports it.
  80
  81 memcached_result_set_value() takes a byte array and a size and sets
  82 the result to this value. This function is used for trigger responses.
  83
  84 void memcached_result_set_flags() takes a result structure and stores
  85 a new value for the flags field.
  86
  87 void memcached_result_set_expiration(A) takes a result structure and stores
  88 a new value for the expiration field (this is only used by read through
  89 triggers).
  90
  91 You may wish to avoid using memcached_result_create(3) with a
  92 stack based allocation. The most common issues related to ABI safety involve
  93 heap allocated structures.
  94
  95 =head1 RETURN
  96
  97 Varies, see particular functions. All structures must have
  98 memcached_result_free() called on them for cleanup purposes. Failure to
  99 do this will result in leaked memory.
 100
 101 =head1 HOME
 102
 103 To find out more information please check:
 104 L<https://launchpad.net/libmemcached>
 105
 106 =head1 AUTHOR
 107
 108 Brian Aker, E<lt>brian@tangent.orgE<gt>
 109
 110 =head1 SEE ALSO
 111
 112 memcached(1) libmemcached(3) memcached_strerror(3)
 113
 114 =cut
 115