-.TH "MEMCACHED_FETCH" "3" "April 14, 2011" "0.47" "libmemcached"
+.TH "MEMCACHED_FETCH" "3" "April 27, 2012" "1.0.6" "libmemcached"
.SH NAME
memcached_fetch \- Retrieving data from the server
.
#include <libmemcached/memcached.h>
.INDENT 0.0
.TP
-.B memcached_result_st * memcached_fetch_result (memcached_st *ptr, memcached_result_st *result, memcached_return_t *error);
-.UNINDENT
-.INDENT 0.0
-.TP
-.B char * memcached_get (memcached_st *ptr, const char *key, size_t key_length, size_t *value_length, uint32_t *flags, memcached_return_t *error);
-.UNINDENT
-.INDENT 0.0
-.TP
-.B memcached_return_t memcached_mget (memcached_st *ptr, const char * const *keys, const size_t *key_length, size_t number_of_keys);
-.UNINDENT
-.INDENT 0.0
-.TP
-.B char * memcached_get_by_key (memcached_st *ptr, const char *group_key, size_t group_key_length, const char *key, size_t key_length, size_t *value_length, uint32_t *flags, memcached_return_t *error);
-.UNINDENT
-.INDENT 0.0
-.TP
-.B memcached_return_t memcached_mget_by_key (memcached_st *ptr, const char *group_key, size_t group_key_length, const char * const *keys, const size_t *key_length, size_t number_of_keys);
-.UNINDENT
-.INDENT 0.0
-.TP
-.B char * memcached_fetch (memcached_st *ptr, char *key, size_t *key_length, size_t *value_length, uint32_t *flags, memcached_return_t *error);
-.UNINDENT
-.INDENT 0.0
-.TP
-.B memcached_return_t memcached_fetch_execute (memcached_st *ptr, memcached_execute_fn *callback, void *context, uint32_t number_of_callbacks);
-.UNINDENT
-.INDENT 0.0
-.TP
-.B memcached_return_t memcached_mget_execute (memcached_st *ptr, const char * const *keys, const size_t *key_length, size_t number_of_keys, memcached_execute_fn *callback, void *context, uint32_t number_of_callbacks);
-.UNINDENT
-.INDENT 0.0
-.TP
-.B memcached_return_t memcached_mget_execute_by_key (memcached_st *ptr, const char *group_key, size_t group_key_length, const char * const *keys, const size_t *key_length, size_t number_of_keys, memcached_execute_fn *callback, void *context, uint32_t number_of_callbacks);
+.B char *memcached_fetch(memcached_st\fI\ *ptr\fP, char\fI\ *key\fP, size_t\fI\ *key_length\fP, size_t\fI\ *value_length\fP, uint32_t\fI\ *flags\fP, memcached_return_t\fI\ *error\fP)
+Deprecated since version 0.50: Use \fBmemcached_fetch_result()\fP instead.
.UNINDENT
.sp
Compile and link with \-lmemcached
.SH DESCRIPTION
.sp
-memcached_get() is used to fetch an individual value from the server. You
-must pass in a key and its length to fetch the object. You must supply
-three pointer variables which will give you the state of the returned
-object. A uint32_t pointer to contain whatever flags you stored with the value,
-a size_t pointer which will be filled with size of of the object, and a
-memcached_return_t pointer to hold any error. The object will be returned
-upon success and NULL will be returned on failure. Any object returned by
-memcached_get() must be released by the caller application.
-.sp
-memcached_mget() is used to select multiple keys at once. For multiple key
-operations it is always faster to use this function. This function always
-works asynchronously. memcached_fetch() is then used to retrieve any keys
-found. No error is given on keys that are not found. You must call either
-memcached_fetch() or memcached_fetch_result() after a successful call to
-memcached_mget(). You should continue to call these functions until they
-return NULL (aka no more values). If you need to quit in the middle of a
-memcached_get() call, execute a memcached_quit(). After you do this, you can
-issue new queries against the server.
-.sp
-memcached_fetch() is used to fetch an individual value from the server.
-memcached_mget() must always be called before using this method. You
-must pass in a key and its length to fetch the object. You must supply
+\fI\%memcached_fetch()\fP is used to fetch an individual value from the server. \fBmemcached_mget()\fP must always be called before using this method.
+You must pass in a key and its length to fetch the object. You must supply
three pointer variables which will give you the state of the returned
-object. A uint32_t pointer to contain whatever flags you stored with the value,
-a size_t pointer which will be filled with size of of the object, and a
-memcached_return_t pointer to hold any error. The object will be returned
-upon success and NULL will be returned on failure. MEMCACHD_END is returned
-by the *error value when all objects that have been found are returned.
-The final value upon MEMCACHED_END is null. Values returned by
-memcached_fetch() musted be free\(aqed by the caller. memcached_fetch() will
-be DEPRECATED in the near future, memcached_fetch_result() should be used
-instead.
-.sp
-memcached_fetch_result() is used to return a memcached_result_st(3) structure
-from a memcached server. The result object is forward compatible with changes
-to the server. For more information please refer to the memcached_result_st(3)
-help. This function will dynamically allocate a result structure for you
-if you do not pass one to the function.
-.sp
-memcached_fetch_execute() is a callback function for result sets. Instead
-of returning the results to you for processing, it passes each of the
-result sets to the list of functions you provide. It passes to the function
-a memcached_st that can be cloned for use in the called function (it can not
-be used directly). It also passes a result set which does not need to be freed.
-Finally it passes a "context". This is just a pointer to a memory reference
-you supply the calling function. Currently only one value is being passed
-to each function call. In the future there will be an option to allow this
-to be an array.
-.sp
-memcached_mget_execute() and memcached_mget_execute_by_key() is
-similar to memcached_mget(), but it may trigger the supplied callbacks
-with result sets while sending out the queries. If you try to perform
-a really large multiget with memcached_mget() you may encounter a
-deadlock in the OS kernel (we fail to write data to the socket because
-the input buffer is full). memcached_mget_execute() solves this
-problem by processing some of the results before continuing sending
-out requests. Please note that this function is only available in the
-binary protocol.
+object. A \fBuint32_t\fP pointer to contain whatever flags you stored with the value, a \fBsize_t\fP pointer which will be filled with size of of the
+object, and a \fBmemcached_return_t\fP pointer to hold any error. The
+object will be returned upon success and NULL will be returned on failure. \fBMEMCACHED_END\fP is returned by the *error value when all objects that have been found are returned. The final value upon \fBMEMCACHED_END\fP is null.
.sp
-memcached_get_by_key() and memcached_mget_by_key() behave in a similar nature
-as memcached_get() and memcached_mget(). The difference is that they take
-a master key that is used for determining which server an object was stored
-if key partitioning was used for storage.
+Values returned by \fI\%memcached_fetch()\fP must be freed by the caller.
.sp
-All of the above functions are not testsed when the \fBMEMCACHED_BEHAVIOR_USE_UDP\fPhas been set. Executing any of these functions with this behavior on will result in
-\fBMEMCACHED_NOT_SUPPORTED\fP being returned or, for those functions which do not return
-a \fBmemcached_return_t\fP, the error function parameter will be set to
-\fBMEMCACHED_NOT_SUPPORTED\fP.
+All of the above functions are not tested when the
+\fBMEMCACHED_BEHAVIOR_USE_UDP\fP has been set. Executing any of these
+functions with this behavior on will result in \fBMEMCACHED_NOT_SUPPORTED\fP being returned, or for those functions which do not return a \fBmemcached_return_t\fP, the error function parameter will be set to \fBMEMCACHED_NOT_SUPPORTED\fP.
.SH RETURN
.sp
-All objects returned must be freed by the calling application.
-memcached_get() and memcached_fetch() will return NULL on error. You must
-look at the value of error to determine what the actual error was.
+\fI\%memcached_fetch()\fP sets error to
+to \fBMEMCACHED_END\fP upon successful conclusion.
+\fBMEMCACHED_NOTFOUND\fP will be return if no keys at all were found.
.sp
-MEMCACHED_KEY_TOO_BIG is set to error whenever memcached_fetch() was used
-and the key was set larger then MEMCACHED_MAX_KEY, which was the largest
+\fBMEMCACHED_KEY_TOO_BIG\fP is set to error whenever \fI\%memcached_fetch()\fP was used
+and the key was set larger then \fBMEMCACHED_MAX_KEY\fP, which was the largest
key allowed for the original memcached ascii server.
.SH HOME
.sp
\fI\%http://libmemcached.org/\fP
.SH SEE ALSO
.sp
-\fImemcached(1)\fP \fIlibmemcached(3)\fP \fImemcached_strerror(3)\fP
+\fImemcached(1)\fP \fIlibmemcached(3)\fP \fImemcached_strerror(3)\fP \fImemcached_fetch_result(3)\fP
.SH AUTHOR
Brian Aker
.SH COPYRIGHT
projects / m6w6 / libmemcached / blobdiff