NAME

       memcached_append - Appending to or Prepending to data on the server

       Appending or Prepending to data on the server

SYNOPSIS

       #include <libmemcached/memcached.h>

       memcached_return_t       memcached_prepend(memcached_st *ptr,       const       char *key,
       size_t key_length,    const    char *value,    size_t value_length,     time_t expiration,
       uint32_t flags)

       memcached_return_t memcached_append(memcached_st *ptr, const char *key, size_t key_length,
       const char *value, size_t value_length, time_t expiration, uint32_t flags)

       memcached_return_t  memcached_prepend_by_key(memcached_st *ptr,   const   char *group_key,
       size_t group_key_length,    const   char *key,   size_t key_length,   const   char *value,
       size_t value_length, time_t expiration, uint32_t flags)

       memcached_return_t   memcached_append_by_key(memcached_st *ptr,   const   char *group_key,
       size_t group_key_length,    const   char *key,   size_t key_length,   const   char *value,
       size_t value_length, time_t expiration, uint32_t flags)

       Compile and link with -lmemcached

DESCRIPTION

       memcached_prepend() and memcached_append are used to modify information on a  server.  All
       methods  take a key, and its length to store the object. Keys are currently limited to 250
       characters when using either a version of memcached which is 1.4 or below, or  when  using
       the  text  protocol. You must supply both a value and a length. Optionally you may test an
       expiration time for the object and a 16 byte value (it is meant to be used as  a  bitmap).
       "flags"  is  a  4byte space that is stored alongside of the main value. Many sub libraries
       make use of this field, so in most cases users should avoid making use of it.

       memcached_prepend() places a segment of  data  before  the  last  piece  of  data  stored.
       Currently expiration and key are not used in the server.

       memcached_append()  places  a segment of data at the end of the last piece of data stored.
       Currently expiration and key are not used in the server.

       memcached_prepend_by_key() and memcached_append_by_key() methods both behave in a  similar
       method  as  the non key methods. The difference is that they use their group_key parameter
       to map objects to particular servers.

       If you are looking for performance, memcached_set() with non-blocking IO  is  the  fastest
       way to store data on the server.

       All  of  the  above  functions  are  testsed  with the MEMCACHED_BEHAVIOR_USE_UDP behavior
       enabled. However, when using these operations with this behavior on, there are  limits  to
       the size of the payload being sent to the server.  The reason for these limits is that the
       Memcached  Server  does  not  allow  multi-datagram  requests  and  the   current   server
       implementation  sets  a  datagram size to 1400 bytes. Due to protocol overhead, the actual
       limit of the user supplied data is less than 1400 bytes and depends on the protocol in use
       as,  well  as  the  operation  being  executed.  When  running  with  the binary protocol,
       MEMCACHED_BEHAVIOR_BINARY_PROTOCOL, the size of the key,value, flags and  expiry  combined
       may  not  exceed  1368  bytes.  When  running  with  the  ASCII  protocol, the exact limit
       fluctuates depending on which function is being executed and whether the function is a cas
       operation  or  not.  For  non-cas  ASCII  set  operations,  there  are at least 1335 bytes
       available to split among the key, key_prefix, and value; for cas  ASCII  operations  there
       are  at  least  1318  bytes available to split among the key, key_prefix and value. If the
       total   size   of   the   command,   including   overhead,   exceeds   1400    bytes,    a
       MEMCACHED_WRITE_FAILURE will be returned.

RETURN

       All  methods  return  a  value  of  type memcached_return_t.  On success the 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)   libmemached(3)   memcached_strerror(3)   memcached_set(3)  memcached_add(3)
       memcached_cas(3) memcached_replace(3)

AUTHOR

       Brian Aker

COPYRIGHT

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