NAME
memcached_increment, memcached_decrement,
memcached_increment_with_initial, memcached_decrement_with_initial -
Manipulate counters
LIBRARY
C Client Library for memcached (libmemcached, -lmemcached)
SYNOPSIS
#include <memcached.h>
memcached_return_t
memcached_increment (memcached_st *ptr,
const char *key, size_t key_length,
unsigned int offset,
uint64_t *value);
memcached_return_t
memcached_decrement (memcached_st *ptr,
const char *key, size_t key_length,
unsigned int 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 *master_key, size_t master_key_length,
const char *key, size_t key_length,
unsigned int offset,
uint64_t *value);
memcached_return_t
memcached_decrement_by_key (memcached_st *ptr,
const char *master_key, size_t master_key_length,
const char *key, size_t key_length,
unsigned int offset,
uint64_t *value);
memcached_return_t
memcached_increment_with_initial_by_key (memcached_st *ptr,
const char *master_key,
size_t master_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 *master_key,
size_t master_key_length,
const char *key,
size_t key_length,
uint64_t offset,
uint64_t initial,
time_t expiration,
uint64_t *value);
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
unsigned int 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
unsigned int 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 unsigned int value pointer you pass to it.
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 unsigned int value pointer you pass to it.
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:
<https://launchpad.net/libmemcached>
AUTHOR
Brian Aker, <brian@tangent.org>
SEE ALSO
memcached(1) libmemcached(3) memcached_strerror(3)
2010-01-07 memcached_decrement.pop(3)