1MEMCACHED_DECREMENT(3)           libmemcached           MEMCACHED_DECREMENT(3)
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NAME

6       memcached_decrement - Incrementing and Decrementing Values
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SYNOPSIS

9       #include <libmemcached/memcached.h>
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11       memcached_return_t     memcached_increment(memcached_st *ptr,     const
12       char *key, size_t key_length, uint32_t offset, uint64_t *value)
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14       memcached_return_t     memcached_decrement(memcached_st *ptr,     const
15       char *key, size_t key_length, uint32_t offset, uint64_t *value)
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17       memcached_return_t  memcached_increment_with_initial(memcached_st *ptr,
18       const char *key, size_t key_length, uint64_t offset,  uint64_t initial,
19       time_t expiration, uint64_t *value)
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21       memcached_return_t  memcached_decrement_with_initial(memcached_st *ptr,
22       const char *key, size_t key_length, uint64_t offset,  uint64_t initial,
23       time_t expiration, uint64_t *value)
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25       memcached_return_t  memcached_increment_by_key(memcached_st *ptr, const
26       char *group_key,     size_t group_key_length,     const      char *key,
27       size_t key_length, uint32_t offset, uint64_t *value)
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29       memcached_return_t  memcached_decrement_by_key(memcached_st *ptr, const
30       char *group_key,     size_t group_key_length,     const      char *key,
31       size_t key_length, uint32_t offset, uint64_t *value)
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33       memcached_return_t         memcached_increment_with_initial_by_key(mem‐
34       cached_st *ptr, const char *group_key,  size_t group_key_length,  const
35       char *key,    size_t key_length,   uint64_t offset,   uint64_t initial,
36       time_t expiration, uint64_t *value)
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38       memcached_return_t         memcached_decrement_with_initial_by_key(mem‐
39       cached_st *ptr,  const  char *group_key, size_t group_key_length, const
40       char *key,   size_t key_length,   uint64_t offset,    uint64_t initial,
41       time_t expiration, uint64_t *value)
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43       Compile and link with -lmemcached
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DESCRIPTION

46       memcached(1)  servers  have the ability to increment and decrement keys
47       (overflow and underflow are not detected). This gives you  the  ability
48       to use memcached to generate shared sequences of values.
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50       memcached_increment  takes a key and keylength and increments the value
51       by the offset passed to it. The value is then returned via the uint32_t
52       value pointer you pass to it.
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54       memcached_decrement  takes a key and keylength and decrements the value
55       by the offset passed to it. The value is then returned via the uint32_t
56       value pointer you pass to it.
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58       memcached_increment_with_initial  takes  a key and keylength and incre‐
59       ments the value by the offset passed to it. If the object specified  by
60       key  does  not  exist,  one of two things may happen: If the expiration
61       value is MEMCACHED_EXPIRATION_NOT_ADD, the operation will fail. For all
62       other  expiration  values,  the  operation  will succeed by seeding the
63       value for that key with a initial value to  expire  with  the  provided
64       expiration  time.  The  flags  will  be  set  to zero.The value is then
65       returned  via  the  uint32_t  value  pointer  you  pass  to  it.   mem‐
66       cached_increment_with_initial  is  only available when using the binary
67       protocol.
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69       memcached_decrement_with_initial takes a key and keylength  and  decre‐
70       ments  the value by the offset passed to it. If the object specified by
71       key does not exist, one of two things may  happen:  If  the  expiration
72       value is MEMCACHED_EXPIRATION_NOT_ADD, the operation will fail. For all
73       other expiration values, the operation  will  succeed  by  seeding  the
74       value  for  that  key  with a initial value to expire with the provided
75       expiration time. The flags will  be  set  to  zero.The  value  is  then
76       returned   via  the  uint32_t  value  pointer  you  pass  to  it.  mem‐
77       cached_decrement_with_initial is only available when using  the  binary
78       protocol.
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80       memcached_increment_by_key(),             memcached_decrement_by_key(),
81       memcached_increment_with_initial_by_key(),                          and
82       memcached_decrement_with_initial_by_key() are master key equivalents of
83       the above.
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RETURN

86       A value of type memcached_return_t  is returned.  On success that value
87       will  be  MEMCACHED_SUCCESS.   Use memcached_strerror to translate this
88       value to a printable string.
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HOME

91       To find out more information please check: http://libmemcached.org/
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SEE ALSO

94       memcached(1) libmemcached(3) memcached_strerror(3)
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AUTHOR

97       Brian Aker
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100       2011-2013, Brian Aker DataDifferential, http://datadifferential.com/
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1051.0.18                         February 09, 2014        MEMCACHED_DECREMENT(3)
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