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.