.\" -*- mode: troff; coding: utf-8 -*- .\" Automatically generated by Pod::Man 5.01 (Pod::Simple 3.43) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" \*(C` and \*(C' are quotes in nroff, nothing in troff, for use with C<>. .ie n \{\ . ds C` "" . ds C' "" 'br\} .el\{\ . ds C` . ds C' 'br\} .\" .\" Escape single quotes in literal strings from groff's Unicode transform. .ie \n(.g .ds Aq \(aq .el .ds Aq ' .\" .\" If the F register is >0, we'll generate index entries on stderr for .\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index .\" entries marked with X<> in POD. Of course, you'll have to process the .\" output yourself in some meaningful fashion. .\" .\" Avoid warning from groff about undefined register 'F'. .de IX .. .nr rF 0 .if \n(.g .if rF .nr rF 1 .if (\n(rF:(\n(.g==0)) \{\ . if \nF \{\ . de IX . tm Index:\\$1\t\\n%\t"\\$2" .. . if !\nF==2 \{\ . nr % 0 . nr F 2 . \} . \} .\} .rr rF .\" ======================================================================== .\" .IX Title "Memcached::libmemcached::memcached_set 3pm" .TH Memcached::libmemcached::memcached_set 3pm 2024-03-07 "perl v5.38.2" "User Contributed Perl Documentation" .\" For nroff, turn off justification. Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH NAME memcached_set, memcached_add, memcached_replace \- Store value on server .SH LIBRARY .IX Header "LIBRARY" C Client Library for memcached (libmemcached, \-lmemcached) .SH SYNOPSIS .IX Header "SYNOPSIS" .Vb 1 \& #include \& \& memcached_return_t \& memcached_set (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_add (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_replace (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(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_cas(memcached_st *ptr, \& const char *key, size_t key_length, \& const char *value, size_t value_length, \& time_t expiration, \& uint32_t flags, \& uint64_t cas); \& \& memcached_return_t \& memcached_set_by_key(memcached_st *ptr, \& const char *master_key, size_t master_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_add_by_key(memcached_st *ptr, \& const char *master_key, size_t master_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_replace_by_key(memcached_st *ptr, \& const char *master_key, size_t master_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_prepend_by_key(memcached_st *ptr, \& const char *master_key, size_t master_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 *master_key, size_t master_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_cas_by_key(memcached_st *ptr, \& const char *master_key, size_t master_key_length, \& const char *key, size_t key_length, \& const char *value, size_t value_length, \& time_t expiration, \& uint32_t flags, \& uint64_t cas); .Ve .SH DESCRIPTION .IX Header "DESCRIPTION" \&\fBmemcached_set()\fR, \fBmemcached_add()\fR, and \fBmemcached_replace()\fR are all used to store information on the server. All methods take a key, and its length to store the object. Keys are currently limited to 250 characters by the \&\fBmemcached\fR\|(1) server. You must also supply a value and a length. Optionally you may support an expiration time for the object and a 16 byte value (it is meant to be used as a bitmap). .PP \&\fBmemcached_set()\fR will write an object to the server. If an object already exists it will overwrite what is in the server. If the object does not exist it will be written. If you are using the non-blocking mode this function will always return true unless a network error occurs. .PP \&\fBmemcached_replace()\fR replaces an object on the server. If the object is not found on the server an error occurs. .PP \&\fBmemcached_add()\fR adds an object to the server. If the object is found on the server an error occurs, otherwise the value is stored. .PP \&\fBmemcached_prepend()\fR places a segment of data before the last piece of data stored. Currently expiration and key are not used in the server. .PP \&\fBmemcached_append()\fR 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. .PP \&\fBmemcached_cas()\fR overwrites data in the server as long as the "cas" value is still the same in the server. You can get the cas value of a result by calling \fBmemcached_result_cas()\fR on a \fBmemcached_result_st\fR\|(3) structure. At the point that this note was written cas is still buggy in memached. Turning on support for it in \fBlibmemcached\fR\|(3) is optional. Please see \fBmemcached_set()\fR for information on how to do this. .PP \&\fBmemcached_set_by_key()\fR, \fBmemcached_add_by_key()\fR, \fBmemcached_replace_by_key()\fR, \&\fBmemcached_prepend_by_key()\fR, \fBmemcached_append_by_key_by_key()\fR, \&\fBmemcached_cas_by_key()\fR methods all behave in a similar method as the non key methods. The difference is that they use their master_key parameter to map objects to particular servers. .PP If you are looking for performance, \fBmemcached_set()\fR with non-blocking IO is the fastest way to store data on the server. .PP All of the above functions are supported with the \f(CW\*(C`MEMCACHED_BEHAVIOR_USE_UDP\*(C'\fR behavior enabled. But 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 Memcahed 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, \f(CW\*(C` MEMCACHED_BEHAVIOR_BINARY_PROTOCOL\*(C'\fR, 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 \f(CW\*(C`MEMCACHED_WRITE_FAILURE\*(C'\fR will be returned. .SH RETURN .IX Header "RETURN" All methods return a value of type \f(CW\*(C`memcached_return_t\*(C'\fR. On success the value will be \f(CW\*(C`MEMCACHED_SUCCESS\*(C'\fR. Use \fBmemcached_strerror()\fR to translate this value to a printable string. .PP For \fBmemcached_replace()\fR and \fBmemcached_add()\fR, \f(CW\*(C`MEMCACHED_NOTSTORED\*(C'\fR is a legitmate error in the case of a collision. .SH HOME .IX Header "HOME" To find out more information please check: .SH AUTHOR .IX Header "AUTHOR" Brian Aker, .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBmemcached\fR\|(1) \fBlibmemached\fR\|(3) \fBmemcached_strerror\fR\|(3)