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MEMCACHED_DECREMENT(3)           libmemcached           MEMCACHED_DECREMENT(3)


NAME

       memcached_decrement - Incrementing and Decrementing Values


SYNOPSIS

       #include <libmemcached/memcached.h>

       memcached_return_t memcached_increment(memcached_st *ptr, const
       char *key, size_t key_length, uint32_t offset, uint64_t *value)

       memcached_return_t memcached_decrement(memcached_st *ptr, const
       char *key, size_t key_length, uint32_t offset, uint64_t *value)

       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)

       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)

       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)

       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)

       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)

       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)

       Compile and link with -lmemcached


DESCRIPTION

       memcached(1) servers have the ability to increment and decrement keys
       (overflow and underflow are not detected). This gives you the ability
       to use memcached to generate shared sequences of values.

       memcached_increment takes a key and keylength and increments the value
       by the offset passed to it. The value is then returned via the uint32_t
       value pointer you pass to it.

       memcached_decrement takes a key and keylength and decrements the value
       by the offset passed to it. The value is then returned via the uint32_t
       value pointer you pass to it.

       memcached_increment_with_initial takes a key and keylength and
       increments the value by the offset passed to it. If the object
       specified by key does not exist, one of two things may happen: If the
       expiration value is MEMCACHED_EXPIRATION_NOT_ADD, the operation will
       fail. For all other expiration values, the operation will succeed by
       seeding the value for that key with a initial value to expire with the
       provided expiration time. The flags will be set to zero.The value is
       then returned via the uint32_t value pointer you pass to it.
       memcached_increment_with_initial is only available when using the
       binary protocol.

       memcached_decrement_with_initial takes a key and keylength and
       decrements the value by the offset passed to it. If the object
       specified by key does not exist, one of two things may happen: If the
       expiration value is MEMCACHED_EXPIRATION_NOT_ADD, the operation will
       fail. For all other expiration values, the operation will succeed by
       seeding the value for that key with a initial value to expire with the
       provided expiration time. The flags will be set to zero.The value is
       then returned via the uint32_t value pointer you pass to it.
       memcached_decrement_with_initial is only available when using the
       binary protocol.

       memcached_increment_by_key(), memcached_decrement_by_key(),
       memcached_increment_with_initial_by_key(), and
       memcached_decrement_with_initial_by_key() are master key equivalents of
       the above.


RETURN

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


HOME

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


SEE ALSO

       memcached(1) libmemcached(3) memcached_strerror(3)


AUTHOR

       Brian Aker


COPYRIGHT

       2011-2013, Brian Aker DataDifferential, http://datadifferential.com/

1.0.18                         February 9, 2014         MEMCACHED_DECREMENT(3)

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