git.m6w6.name Git - awesomized/libmemcached/blob - docs/man/memcached_prepend_by_key.3

   1 .TH "MEMCACHED_PREPEND_BY_KEY" "3" "June 02, 2011" "0.47" "libmemcached"
   2 .SH NAME
   3 memcached_prepend_by_key \- Appending to or Prepending to data on the server
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  34 Appending or Prepending to data on the server
  35 .SH SYNOPSIS
  36 .sp
  37 #include <libmemcached/memcached.h>
  38 .INDENT 0.0
  39 .TP
  40 .B memcached_return_t memcached_prepend(memcached_st\fI\ *ptr\fP, const char\fI\ *key\fP, size_t\fI\ key_length\fP, const char\fI\ *value\fP, size_t\fI\ value_length\fP, time_t\fI\ expiration\fP, uint32_t\fI\ flags\fP)
  41 .UNINDENT
  42 .INDENT 0.0
  43 .TP
  44 .B memcached_return_t memcached_append(memcached_st\fI\ *ptr\fP, const char\fI\ *key\fP, size_t\fI\ key_length\fP, const char\fI\ *value\fP, size_t\fI\ value_length\fP, time_t\fI\ expiration\fP, uint32_t\fI\ flags\fP)
  45 .UNINDENT
  46 .INDENT 0.0
  47 .TP
  48 .B 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);
  49 .UNINDENT
  50 .INDENT 0.0
  51 .TP
  52 .B 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);
  53 .UNINDENT
  54 .sp
  55 Compile and link with \-lmemcached
  56 .SH DESCRIPTION
  57 .sp
  58 memcached_prepend() and memcached_append are used to
  59 modify information on a server. All methods take a key, and its length to
  60 store the object. Keys are currently limited to 250 characters when using either a version of memcached(1) which is 1.4 or below, or when using the text protocol.
  61 You must supply both a value and a length. Optionally you
  62 may test an expiration time for the object and a 16 byte value (it is
  63 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.
  64 .sp
  65 memcached_prepend() places a segment of data before the last piece of data
  66 stored. Currently expiration and key are not used in the server.
  67 .sp
  68 memcached_append() places a segment of data at the end of the last piece of
  69 data stored. Currently expiration and key are not used in the server.
  70 .sp
  71 memcached_prepend_by_key() and memcached_append_by_key_by_key(,
  72 methods both behave in a similar method as the non key
  73 methods. The difference is that they use their group_key parameter to map
  74 objects to particular servers.
  75 .sp
  76 If you are looking for performance, memcached_set() with non\-blocking IO is
  77 the fastest way to store data on the server.
  78 .sp
  79 All of the above functions are testsed with the \fBMEMCACHED_BEHAVIOR_USE_UDP\fPbehavior enabled. However, when using these operations with this behavior on, there
  80 are limits to the size of the payload being sent to the server.  The reason for
  81 these limits is that the Memcached Server does not allow multi\-datagram requests
  82 and the current server implementation sets a datagram size to 1400 bytes. Due
  83 to protocol overhead, the actual limit of the user supplied data is less than
  84 1400 bytes and depends on the protocol in use as, well as the operation being
  85 executed. When running with the binary protocol, \(ga\(ga MEMCACHED_BEHAVIOR_BINARY_PROTOCOL\(ga\(ga,
  86 the size of the key,value, flags and expiry combined may not exceed 1368 bytes.
  87 When running with the ASCII protocol, the exact limit fluctuates depending on
  88 which function is being executed and whether the function is a cas operation
  89 or not. For non\-cas ASCII set operations, there are at least 1335 bytes available
  90 to split among the key, key_prefix, and value; for cas ASCII operations there are
  91 at least 1318 bytes available to split among the key, key_prefix and value. If the
  92 total size of the command, including overhead, exceeds 1400 bytes, a \fBMEMCACHED_WRITE_FAILURE\fPwill be returned.
  93 .SH RETURN
  94 .sp
  95 All methods return a value of type \fBmemcached_return_t\fP.
  96 On success the value will be \fBMEMCACHED_SUCCESS\fP.
  97 Use memcached_strerror() to translate this value to a printable string.
  98 .SH HOME
  99 .sp
 100 To find out more information please check:
 101 \fI\%http://libmemcached.org/\fP
 102 .SH SEE ALSO
 103 .sp
 104 memcached(1) libmemached(3) memcached_strerror(3) memcached_set(3) memcached_add(3) memcached_cas(3) memcached_replace(3)
 105 .SH AUTHOR
 106 Brian Aker
 107 .SH COPYRIGHT
 108 2011, Brian Aker DataDifferential, http://datadifferential.com/
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