1memcached_append.pop(3)        memcached_append        memcached_append.pop(3)
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NAME

6       memcached_set, memcached_add, memcached_replace - Store value on server
7

LIBRARY

9       C Client Library for memcached (libmemcached, -lmemcached)
10

SYNOPSIS

12         #include <memcached.h>
13
14         memcached_return_t
15           memcached_set (memcached_st *ptr,
16                          const char *key, size_t key_length,
17                          const char *value, size_t value_length,
18                          time_t expiration,
19                          uint32_t flags);
20
21         memcached_return_t
22           memcached_add (memcached_st *ptr,
23                          const char *key, size_t key_length,
24                          const char *value, size_t value_length,
25                          time_t expiration,
26                          uint32_t flags);
27
28         memcached_return_t
29           memcached_replace (memcached_st *ptr,
30                              const char *key, size_t key_length,
31                              const char *value, size_t value_length,
32                              time_t expiration,
33                              uint32_t flags);
34
35         memcached_return_t
36           memcached_prepend(memcached_st *ptr,
37                             const char *key, size_t key_length,
38                             const char *value, size_t value_length,
39                             time_t expiration,
40                             uint32_t flags)
41
42         memcached_return_t
43           memcached_append(memcached_st *ptr,
44                            const char *key, size_t key_length,
45                             const char *value, size_t value_length,
46                             time_t expiration,
47                             uint32_t flags)
48         memcached_return_t
49           memcached_cas(memcached_st *ptr,
50                         const char *key, size_t key_length,
51                         const char *value, size_t value_length,
52                         time_t expiration,
53                         uint32_t flags,
54                         uint64_t cas);
55
56         memcached_return_t
57           memcached_set_by_key(memcached_st *ptr,
58                                const char *master_key, size_t master_key_length,
59                                const char *key, size_t key_length,
60                                const char *value, size_t value_length,
61                                time_t expiration,
62                                uint32_t flags);
63
64         memcached_return_t
65           memcached_add_by_key(memcached_st *ptr,
66                                const char *master_key, size_t master_key_length,
67                                const char *key, size_t key_length,
68                                const char *value, size_t value_length,
69                                time_t expiration,
70                                uint32_t flags);
71
72         memcached_return_t
73           memcached_replace_by_key(memcached_st *ptr,
74                                    const char *master_key, size_t master_key_length,
75                                    const char *key, size_t key_length,
76                                    const char *value, size_t value_length,
77                                    time_t expiration,
78                                    uint32_t flags);
79
80         memcached_return_t
81           memcached_prepend_by_key(memcached_st *ptr,
82                                    const char *master_key, size_t master_key_length,
83                                    const char *key, size_t key_length,
84                                    const char *value, size_t value_length,
85                                    time_t expiration,
86                                    uint32_t flags);
87
88         memcached_return_t
89           memcached_append_by_key(memcached_st *ptr,
90                                   const char *master_key, size_t master_key_length,
91                                   const char *key, size_t key_length,
92                                   const char *value, size_t value_length,
93                                   time_t expiration,
94                                   uint32_t flags);
95
96         memcached_return_t
97           memcached_cas_by_key(memcached_st *ptr,
98                                const char *master_key, size_t master_key_length,
99                                const char *key, size_t key_length,
100                                const char *value, size_t value_length,
101                                time_t expiration,
102                                uint32_t flags,
103                                uint64_t cas);
104

DESCRIPTION

106       memcached_set(), memcached_add(), and memcached_replace() are all used
107       to store information on the server. All methods take a key, and its
108       length to store the object. Keys are currently limited to 250
109       characters by the memcached(1) server. You must also supply a value and
110       a length. Optionally you may support an expiration time for the object
111       and a 16 byte value (it is meant to be used as a bitmap).
112
113       memcached_set() will write an object to the server. If an object
114       already exists it will overwrite what is in the server. If the object
115       does not exist it will be written. If you are using the non-blocking
116       mode this function will always return true unless a network error
117       occurs.
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119       memcached_replace() replaces an object on the server. If the object is
120       not found on the server an error occurs.
121
122       memcached_add() adds an object to the server. If the object is found on
123       the server an error occurs, otherwise the value is stored.
124
125       memcached_prepend() places a segment of data before the last piece of
126       data stored. Currently expiration and key are not used in the server.
127
128       memcached_append() places a segment of data at the end of the last
129       piece of data stored. Currently expiration and key are not used in the
130       server.
131
132       memcached_cas() overwrites data in the server as long as the "cas"
133       value is still the same in the server. You can get the cas value of a
134       result by calling memcached_result_cas() on a memcached_result_st(3)
135       structure. At the point that this note was written cas is still buggy
136       in memached. Turning on support for it in libmemcached(3) is optional.
137       Please see memcached_set() for information on how to do this.
138
139       memcached_set_by_key(), memcached_add_by_key(),
140       memcached_replace_by_key(), memcached_prepend_by_key(),
141       memcached_append_by_key_by_key(), memcached_cas_by_key() methods all
142       behave in a similar method as the non key methods. The difference is
143       that they use their master_key parameter to map objects to particular
144       servers.
145
146       If you are looking for performance, memcached_set() with non-blocking
147       IO is the fastest way to store data on the server.
148
149       All of the above functions are supported with the
150       "MEMCACHED_BEHAVIOR_USE_UDP" behavior enabled. But when using these
151       operations with this behavior on, there are limits to the size of the
152       payload being sent to the server.  The reason for these limits is that
153       the Memcahed Server does not allow multi-datagram requests and the
154       current server implementation sets a datagram size to 1400 bytes. Due
155       to protocol overhead, the actual limit of the user supplied data is
156       less than 1400 bytes and depends on the protocol in use as well as the
157       operation being executed. When running with the binary protocol, "
158       MEMCACHED_BEHAVIOR_BINARY_PROTOCOL", the size of the key,value, flags
159       and expiry combined may not exceed 1368 bytes.  When running with the
160       ASCII protocol, the exact limit fluctuates depending on which function
161       is being executed and whether the function is a cas operation or not.
162       For non-cas ASCII set operations, there are at least 1335 bytes
163       available to split among the key, key_prefix, and value; for cas ASCII
164       operations there are at least 1318 bytes available to split among the
165       key, key_prefix and value. If the total size of the command, including
166       overhead, exceeds 1400 bytes, a "MEMCACHED_WRITE_FAILURE" will be
167       returned.
168

RETURN

170       All methods return a value of type "memcached_return_t".  On success
171       the value will be "MEMCACHED_SUCCESS".  Use memcached_strerror() to
172       translate this value to a printable string.
173
174       For memcached_replace() and memcached_add(), "MEMCACHED_NOTSTORED" is a
175       legitmate error in the case of a collision.
176

HOME

178       To find out more information please check:
179       <https://launchpad.net/libmemcached>
180

AUTHOR

182       Brian Aker, <brian@tangent.org>
183

SEE ALSO

185       memcached(1) libmemached(3) memcached_strerror(3)
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189                                  2010-06-28           memcached_append.pop(3)
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