-.. highlight:: perl
+===============================
+Retrieving data from the server
+===============================
+.. index:: object: memcached_st
-memcached_get, memcached_mget, memcached_fetch, memcached_mget_execute, memcached_mget_execute_by_key
-*****************************************************************************************************
+--------
+SYNOPSIS
+--------
-Get a value
+#include <libmemcached/memcached.h>
+
+.. c:function:: memcached_result_st * memcached_fetch_result (memcached_st *ptr, memcached_result_st *result, memcached_return_t *error)
+.. c:function:: char * memcached_get (memcached_st *ptr, const char *key, size_t key_length, size_t *value_length, uint32_t *flags, memcached_return_t *error)
-*******
-LIBRARY
-*******
+.. c:function:: memcached_return_t memcached_mget (memcached_st *ptr, const char * const *keys, const size_t *key_length, size_t number_of_keys)
+.. c:function:: 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)
-C Client Library for memcached (libmemcached, -lmemcached)
+.. c:function:: 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)
+.. c:function:: memcached_return_t memcached_fetch_execute (memcached_st *ptr, memcached_execute_fn *callback, void *context, uint32_t number_of_callbacks)
-********
-SYNOPSIS
-********
+.. c:function:: 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)
+.. c:function:: 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)
+.. c:type:: memcached_return_t (*memcached_execute_fn)(const memcached_st *ptr, memcached_result_st *result, void *context)
-.. code-block:: perl
-
- #include <libmemcached/memcached.h>
-
- memcached_result_st *
- memcached_fetch_result (memcached_st *ptr,
- memcached_result_st *result,
- memcached_return_t *error);
-
- char *
- memcached_get (memcached_st *ptr,
- const char *key, size_t key_length,
- size_t *value_length,
- uint32_t *flags,
- memcached_return_t *error);
-
- memcached_return_t
- memcached_mget (memcached_st *ptr,
- const char * const *keys,
- const size_t *key_length,
- size_t number_of_keys);
- char *
- memcached_get_by_key (memcached_st *ptr,
- const char *master_key, size_t master_key_length,
- const char *key, size_t key_length,
- size_t *value_length,
- uint32_t *flags,
- memcached_return_t *error);
-
- memcached_return_t
- memcached_mget_by_key (memcached_st *ptr,
- const char *master_key, size_t master_key_length,
- const char * const *keys,
- const size_t *key_length,
- size_t number_of_keys);
-
- char *
- memcached_fetch (memcached_st *ptr,
- char *key, size_t *key_length,
- size_t *value_length,
- uint32_t *flags,
- memcached_return_t *error);
-
- memcached_return_t
- memcached_fetch_execute (memcached_st *ptr,
- memcached_execute_fn *callback,
- void *context,
- uint32_t number_of_callbacks);
-
-
- 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);
-
- memcached_return_t
- memcached_mget_execute_by_key (memcached_st *ptr,
- const char *master_key,
- size_t master_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);
-
+Compile and link with -lmemcached
-***********
+-----------
DESCRIPTION
-***********
+-----------
-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
+:c:func:`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.
-
-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.
-
-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
+object. A :c:type:`uint32_t` pointer to contain whatever flags you stored with the value, a :c:type:`size_t` pointer which will be filled with size of of
+the object, and a :c:type:`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 :c:func:`memcached_get` must be released by the caller
+application.
+
+:c:func:`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.
+
+To retrieve data after a successful execution of :c:func:`memcached_mget`, you will need to
+call :c:func:`memcached_fetch_result`. You should continue to call this function until
+it returns a NULL (i.e. no more values). If you need to quit in the middle of a
+:c:func:`memcached_mget` call, you can execute a :c:func:`memcached_quit`, those this is not required.
+
+:c:func:`memcached_fetch_result` is used to fetch an individual value from the server. :c:func:`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
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'ed by the caller. memcached_fetch() will
-be DEPRECATED in the near future, memcached_fetch_result() should be used
-instead.
-
-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.
-
-memcached_fetch_execute() is a callback function for result sets. Instead
-of returning the results to you for processing, it passes each of the
+object. A :c:type:`uint32_t` pointer to contain whatever flags you stored with the value, a :c:type:`size_t` pointer which will be filled with size of of the
+object, and a :c:type:`memcached_return_t` pointer to hold any error. The
+object will be returned upon success and NULL will be returned on failure. :c:type:`MEMCACHED_END` is returned by the \*error value when all objects that have been found are returned. The final value upon :c:type:`MEMCACHED_END` is null.
+
+:c:func:`memcached_fetch_result` is used to return a :c:type:`memcached_result_st` structure from a memcached server. The result object is forward compatible
+with changes to the server. For more information please refer to the
+:c:type:`memcached_result_st` help. This function will dynamically allocate a
+result structure for you if you do not pass one to the function.
+
+:c:func:`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.
-
-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.
-
-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.
-
-All of the above functions are not supported when the \ ``MEMCACHED_BEHAVIOR_USE_UDP``\
-has been set. Executing any of these functions with this behavior on will result in
-\ ``MEMCACHED_NOT_SUPPORTED``\ being returned or, for those functions which do not return
-a \ ``memcached_return_t``\ , the error function parameter will be set to
-\ ``MEMCACHED_NOT_SUPPORTED``\ .
-
-
-******
+a :c:type:`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.
+
+:c:func:`memcached_mget_execute` and :c:func:`memcached_mget_execute_by_key`
+is similar to :c:func:`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 :c:func:`memcached_mget` you may
+encounter a deadlock in the OS kernel (it will fail to write data to the
+socket because the input buffer is full). :c:func:`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.
+
+:c:func:`memcached_get_by_key` and :c:func:`memcached_mget_by_key` behave
+in a similar nature as :c:func:`memcached_get` and :c:func:`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.
+
+All of the above functions are not tested when the
+:c:type:`MEMCACHED_BEHAVIOR_USE_UDP` has been set. Executing any of these
+functions with this behavior on will result in :c:type:`MEMCACHED_NOT_SUPPORTED` being returned, or for those functions which do not return a :c:type:`memcached_return_t`, the error function parameter will be set to :c:type:`MEMCACHED_NOT_SUPPORTED`.
+
+
+------
RETURN
-******
+------
-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.
+All objects retrieved via :c:func:`memcached_get` or :c:func:`memcached_get_by_key` must be freed with :manpage:`free(3)`.
-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
-key allowed for the original memcached ascii server.
+:c:func:`memcached_get` will return NULL on
+error. You must look at the value of error to determine what the actual error
+was.
+:c:func:`memcached_fetch_execute` return :c:type:`MEMCACHED_SUCCESS` if
+all keys were successful. :c:type:`MEMCACHED_NOTFOUND` will be return if no
+keys at all were found.
-****
+:c:func:`memcached_fetch_result` sets error
+to :c:type:`MEMCACHED_END` upon successful conclusion.
+:c:type:`MEMCACHED_NOTFOUND` will be return if no keys at all were found.
+
+----
HOME
-****
+----
To find out more information please check:
-`https://launchpad.net/libmemcached <https://launchpad.net/libmemcached>`_
-
-
-******
-AUTHOR
-******
-
-
-Brian Aker, <brian@tangent.org>
+`http://libmemcached.org/ <http://libmemcached.org/>`_
-********
+--------
SEE ALSO
-********
+--------
:manpage:`memcached(1)` :manpage:`libmemcached(3)` :manpage:`memcached_strerror(3)`
projects / awesomized / libmemcached / blobdiff