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[awesomized/libmemcached] / docs / man / memcached_prepend_by_key.3
1 .TH "MEMCACHED_PREPEND_BY_KEY" "3" "April 12, 2011" "0.47" "libmemcached"
2 .SH NAME
3 memcached_prepend_by_key \- Storing and Replacing Data
4 .
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32 .
33 .sp
34 Store value on server
35 .SH SYNOPSIS
36 .sp
37 #include <libmemcached/memcached.h>
38 .INDENT 0.0
39 .TP
40 .B 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);
41 .UNINDENT
42 .INDENT 0.0
43 .TP
44 .B 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);
45 .UNINDENT
46 .INDENT 0.0
47 .TP
48 .B 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);
49 .UNINDENT
50 .INDENT 0.0
51 .TP
52 .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)
53 .UNINDENT
54 .INDENT 0.0
55 .TP
56 .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)
57 .UNINDENT
58 .INDENT 0.0
59 .TP
60 .B 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);
61 .UNINDENT
62 .INDENT 0.0
63 .TP
64 .B memcached_return_t memcached_set_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);
65 .UNINDENT
66 .INDENT 0.0
67 .TP
68 .B memcached_return_t memcached_add_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);
69 .UNINDENT
70 .INDENT 0.0
71 .TP
72 .B memcached_return_t memcached_replace_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);
73 .UNINDENT
74 .INDENT 0.0
75 .TP
76 .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);
77 .UNINDENT
78 .INDENT 0.0
79 .TP
80 .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);
81 .UNINDENT
82 .INDENT 0.0
83 .TP
84 .B memcached_return_t memcached_cas_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, uint64_t cas);
85 .UNINDENT
86 .sp
87 Compile and link with \-lmemcached
88 .SH DESCRIPTION
89 .sp
90 memcached_set(), memcached_add(), and memcached_replace() are all used to
91 store information on the server. All methods take a key, and its length to
92 store the object. Keys are currently limited to 250 characters by the
93 memcached(1) server. You must also supply a value and a length. Optionally you
94 may tests an expiration time for the object and a 16 byte value (it is
95 meant to be used as a bitmap).
96 .sp
97 memcached_set() will write an object to the server. If an object already
98 exists it will overwrite what is in the server. If the object does not exist
99 it will be written. If you are using the non\-blocking mode this function
100 will always return true unless a network error occurs.
101 .sp
102 memcached_replace() replaces an object on the server. If the object is not
103 found on the server an error occurs.
104 .sp
105 memcached_add() adds an object to the server. If the object is found on the
106 server an error occurs, otherwise the value is stored.
107 .sp
108 memcached_prepend() places a segment of data before the last piece of data
109 stored. Currently expiration and key are not used in the server.
110 .sp
111 memcached_append() places a segment of data at the end of the last piece of
112 data stored. Currently expiration and key are not used in the server.
113 .sp
114 memcached_cas() overwrites data in the server as long as the "cas" value is
115 still the same in the server. You can get the cas value of a result by
116 calling memcached_result_cas() on a memcached_result_st(3) structure. At the point
117 that this note was written cas is still buggy in memached. Turning on tests
118 for it in libmemcached(3) is optional. Please see memcached_set() for
119 information on how to do this.
120 .sp
121 memcached_set_by_key(), memcached_add_by_key(), memcached_replace_by_key(),
122 memcached_prepend_by_key(), memcached_append_by_key_by_key(),
123 memcached_cas_by_key() methods all behave in a similar method as the non key
124 methods. The difference is that they use their group_key parameter to map
125 objects to particular servers.
126 .sp
127 If you are looking for performance, memcached_set() with non\-blocking IO is
128 the fastest way to store data on the server.
129 .sp
130 All of the above functions are testsed with the \fBMEMCACHED_BEHAVIOR_USE_UDP\fPbehavior enabled. But when using these operations with this behavior on, there
131 are limits to the size of the payload being sent to the server. The reason for
132 these limits is that the Memcahed Server does not allow multi\-datagram requests
133 and the current server implementation sets a datagram size to 1400 bytes. Due
134 to protocol overhead, the actual limit of the user supplied data is less than
135 1400 bytes and depends on the protocol in use as well as the operation being
136 executed. When running with the binary protocol, \(ga\(ga MEMCACHED_BEHAVIOR_BINARY_PROTOCOL\(ga\(ga,
137 the size of the key,value, flags and expiry combined may not exceed 1368 bytes.
138 When running with the ASCII protocol, the exact limit fluctuates depending on
139 which function is being executed and whether the function is a cas operation
140 or not. For non\-cas ASCII set operations, there are at least 1335 bytes available
141 to split among the key, key_prefix, and value; for cas ASCII operations there are
142 at least 1318 bytes available to split among the key, key_prefix and value. If the
143 total size of the command, including overhead, exceeds 1400 bytes, a \fBMEMCACHED_WRITE_FAILURE\fPwill be returned.
144 .SH RETURN
145 .sp
146 All methods return a value of type \fBmemcached_return_t\fP.
147 On success the value will be \fBMEMCACHED_SUCCESS\fP.
148 Use memcached_strerror() to translate this value to a printable string.
149 .sp
150 For memcached_replace() and memcached_add(), \fBMEMCACHED_NOTSTORED\fP is a
151 legitmate error in the case of a collision.
152 .SH HOME
153 .sp
154 To find out more information please check:
155 \fI\%https://launchpad.net/libmemcached\fP
156 .SH SEE ALSO
157 .sp
158 memcached(1) libmemached(3) memcached_strerror(3)
159 .SH AUTHOR
160 Brian Aker
161 .SH COPYRIGHT
162 2011, Brian Aker DataDifferential, http://datadifferential.com/
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