git.m6w6.name Git - m6w6/libmemcached/blob - docs/memcached_auto.rst

   1 ====================================
   2 Incrementing and Decrementing Values
   3 ====================================
   4
   5 .. index:: object: memcached_st
   6
   7 --------
   8 SYNOPSIS
   9 --------
  10
  11 #include <libmemcached/memcached.h>
  12
  13 .. c:function:: memcached_return_t memcached_increment (memcached_st *ptr, const char *key, size_t key_length, uint32_t offset, uint64_t *value)
  14
  15 .. c:function:: memcached_return_t memcached_decrement (memcached_st *ptr, const char *key, size_t key_length, uint32_t offset, uint64_t *value)
  16
  17 .. c:function:: memcached_return_t memcached_increment_with_initial (memcached_st *ptr, const char *key, size_t key_length, uint64_t offset, uint64_t initial, time_t expiration, uint64_t *value)
  18
  19 .. c:function:: memcached_return_t memcached_decrement_with_initial (memcached_st *ptr, const char *key, size_t key_length, uint64_t offset, uint64_t initial, time_t expiration, uint64_t *value)
  20
  21 .. c:function::  memcached_return_t memcached_increment_by_key (memcached_st *ptr, const char *group_key, size_t group_key_length, const char *key, size_t key_length, uint32_t offset, uint64_t *value)
  22
  23 .. c:function:: memcached_return_t memcached_decrement_by_key (memcached_st *ptr, const char *group_key, size_t group_key_length, const char *key, size_t key_length, uint32_t offset, uint64_t *value)
  24
  25 .. c:function:: memcached_return_t memcached_increment_with_initial_by_key (memcached_st *ptr, const char *group_key, size_t group_key_length, const char *key, size_t key_length, uint64_t offset, uint64_t initial, time_t expiration, uint64_t *value)
  26
  27 .. c:function:: memcached_return_t memcached_decrement_with_initial_by_key (memcached_st *ptr, const char *group_key, size_t group_key_length, const char *key, size_t key_length, uint64_t offset, uint64_t initial, time_t expiration, uint64_t *value)
  28
  29 Compile and link with -lmemcached
  30
  31
  32 -----------
  33 DESCRIPTION
  34 -----------
  35
  36
  37 :manpage:`memcached(1)` servers have the ability to increment and decrement keys
  38 (overflow and underflow are not detected). This gives you the ability to use
  39 memcached to generate shared sequences of values.
  40
  41 memcached_increment takes a key and keylength and increments the value by
  42 the offset passed to it. The value is then returned via the uint32_t
  43 value pointer you pass to it.
  44
  45 memcached_decrement takes a key and keylength and decrements the value by
  46 the offset passed to it. The value is then returned via the uint32_t
  47 value pointer you pass to it.
  48
  49 memcached_increment_with_initial takes a key and keylength and increments
  50 the value by the offset passed to it. If the object specified by key does
  51 not exist, one of two things may happen: If the expiration value is
  52 MEMCACHED_EXPIRATION_NOT_ADD, the operation will fail. For all other
  53 expiration values, the operation will succeed by seeding the value for that
  54 key with a initial value to expire with the provided expiration time. The
  55 flags will be set to zero.The value is then returned via the uint32_t
  56 value pointer you pass to it.
  57
  58 memcached_decrement_with_initial takes a key and keylength and decrements
  59 the value by the offset passed to it. If the object specified by key does
  60 not exist, one of two things may happen: If the expiration value is
  61 MEMCACHED_EXPIRATION_NOT_ADD, the operation will fail. For all other
  62 expiration values, the operation will succeed by seeding the value for that
  63 key with a initial value to expire with the provided expiration time. The
  64 flags will be set to zero.The value is then returned via the uint32_t
  65 value pointer you pass to it.
  66
  67 :c:func:`memcached_increment_by_key`, :c:func:`memcached_decrement_by_key`,
  68 :c:func:`memcached_increment_with_initial_by_key`, and
  69 :c:func:`memcached_decrement_with_initial_by_key` are master key equivalents of the above.
  70
  71
  72 ------
  73 RETURN
  74 ------
  75
  76
  77 A value of type :c:type:`memcached_return_t`  is returned.
  78 On success that value will be :c:type:`MEMCACHED_SUCCESS`.
  79 Use memcached_strerror to translate this value to a printable string.
  80
  81
  82 ----
  83 HOME
  84 ----
  85
  86
  87 To find out more information please check:
  88 `http://libmemcached.org/ <http://libmemcached.org/>`_
  89
  90
  91 --------
  92 SEE ALSO
  93 --------
  94
  95
  96 :manpage:`memcached(1)` :manpage:`libmemcached(3)` :manpage:`memcached_strerror(3)`