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

   1 .TH "MEMCACHED_PREPEND" "3" "July 21, 2011" "0.51" "libmemcached"
   2 .SH NAME
   3 memcached_prepend \- 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 \fI\%memcached_prepend()\fP 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
  61 either a version of memcached which is 1.4 or below, or when using the text
  62 protocol. You must supply both a value and a length. Optionally you
  63 may test an expiration time for the object and a 16 byte value (it is
  64 meant to be used as a bitmap). "flags" is a 4byte space that is stored
  65 alongside of the main value. Many sub libraries make use of this field,
  66 so in most cases users should avoid making use of it.
  67 .sp
  68 \fI\%memcached_prepend()\fP places a segment of data before the last piece
  69 of data stored. Currently expiration and key are not used in the server.
  70 .sp
  71 \fI\%memcached_append()\fP places a segment of data at the end of the last
  72 piece of data stored. Currently expiration and key are not used in the server.
  73 .sp
  74 \fBmemcached_prepend_by_key()\fP and
  75 \fBmemcached_append_by_key_by_key()\fP methods both behave in a similar
  76 method as the non key methods. The difference is that they use their
  77 group_key parameter to map objects to particular servers.
  78 .sp
  79 If you are looking for performance, \fBmemcached_set()\fP with non\-blocking
  80 IO is the fastest way to store data on the server.
  81 .sp
  82 All of the above functions are testsed with the
  83 \fBMEMCACHED_BEHAVIOR_USE_UDP\fP behavior enabled. However, when using
  84 these operations with this behavior on, there are limits to the size of the
  85 payload being sent to the server.  The reason for these limits is that the
  86 Memcached Server does not allow multi\-datagram requests
  87 and the current server implementation sets a datagram size to 1400 bytes. Due
  88 to protocol overhead, the actual limit of the user supplied data is less than
  89 1400 bytes and depends on the protocol in use as, well as the operation being
  90 executed. When running with the binary protocol,
  91 \fBMEMCACHED_BEHAVIOR_BINARY_PROTOCOL\fP, the size of the key,value,
  92 flags and expiry combined may not exceed 1368 bytes. When running with the
  93 ASCII protocol, the exact limit fluctuates depending on which function is
  94 being executed and whether the function is a cas operation or not. For
  95 non\-cas ASCII set operations, there are at least 1335 bytes available
  96 to split among the key, key_prefix, and value; for cas ASCII operations
  97 there are at least 1318 bytes available to split among the key, key_prefix
  98 and value. If the total size of the command, including overhead, exceeds
  99 1400 bytes, a \fBMEMCACHED_WRITE_FAILURE\fP will be returned.
 100 .SH RETURN
 101 .sp
 102 All methods return a value of type \fBmemcached_return_t\fP.
 103 On success the value will be \fBMEMCACHED_SUCCESS\fP.
 104 Use \fBmemcached_strerror()\fP to translate this value to a printable
 105 string.
 106 .SH HOME
 107 .sp
 108 To find out more information please check:
 109 \fI\%http://libmemcached.org/\fP
 110 .SH SEE ALSO
 111 .sp
 112 \fImemcached(1)\fP \fIlibmemached(3)\fP \fImemcached_strerror(3)\fP \fImemcached_set(3)\fP \fImemcached_add(3)\fP \fImemcached_cas(3)\fP \fImemcached_replace(3)\fP
 113 .SH AUTHOR
 114 Brian Aker
 115 .SH COPYRIGHT
 116 2011, Brian Aker DataDifferential, http://datadifferential.com/
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