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/