Determine if a keys exists

SYNOPSIS

#include <libmemcached/memcached.h>
Compile and link with -lmemcached
memcached_return_t memcached_exist(memcached_st *ptr, char *key, size_t *key_length)
memcached_return_t memcached_exist_by_key(memcached_st *ptr, char *group_key, size_t *group_key_length, char *key, size_t *key_length)
Parameters:
  • ptr -- pointer to an initialized memcached_st struct
  • group_key -- the key namespace
  • group_key_length -- length of the group_key without any terminating zero
  • key -- the key to check
  • key_length -- length of the key without any terminating zero
Returns:

memcached_return_t indicating success

New in version 0.53.

DESCRIPTION

memcached_exist() can be used to check if a key exists.

RETURN VALUE

MEMCACHED_SUCCESS
The key exists.
MEMCACHED_NOTFOUND
The key was not found.