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191 <h1>memcached_fetch
<a class=
"headerlink" href=
"#memcached-fetch" title=
"Permalink to this headline">¶
</a></h1>
192 <div class=
"section" id=
"synopsis">
193 <h2>SYNOPSIS
<a class=
"headerlink" href=
"#synopsis" title=
"Permalink to this headline">¶
</a></h2>
195 <dt>#include
<libmemcached/memcached.h
></dt><dd><p>Compile and link with -lmemcached
</p>
198 <dl class=
"cpp function">
199 <dt id=
"_CPPv415memcached_fetchP12memcached_stPcP6size_tP6size_tP8uint32_tP18memcached_return_t">
200 <span id=
"_CPPv315memcached_fetchP12memcached_stPcP6size_tP6size_tP8uint32_tP18memcached_return_t"></span><span id=
"_CPPv215memcached_fetchP12memcached_stPcP6size_tP6size_tP8uint32_tP18memcached_return_t"></span><span id=
"memcached_fetch__memcached_stP.cP.sP.sP.uint32_tP.memcached_return_tP"></span>char *
<code class=
"sig-name descname">memcached_fetch
</code><span class=
"sig-paren">(
</span><a class=
"reference internal" href=
"memcached_create.html#_CPPv412memcached_st" title=
"memcached_st">memcached_st
</a> *
<em>ptr
</em>, char *
<em>key
</em>, size_t *
<em>key_length
</em>, size_t *
<em>value_length
</em>, uint32_t *
<em>flags
</em>,
<a class=
"reference internal" href=
"memcached_return_t.html#_CPPv418memcached_return_t" title=
"memcached_return_t">memcached_return_t
</a> *
<em>error
</em><span class=
"sig-paren">)
</span><a class=
"headerlink" href=
"#_CPPv415memcached_fetchP12memcached_stPcP6size_tP6size_tP8uint32_tP18memcached_return_t" title=
"Permalink to this definition">¶
</a><br /></dt>
201 <dd><div class=
"deprecated">
202 <p><span class=
"versionmodified deprecated">Deprecated since version
0.50:
</span>Use
<a class=
"reference internal" href=
"memcached_get.html#_CPPv422memcached_fetch_resultP12memcached_stP19memcached_result_stP18memcached_return_t" title=
"memcached_fetch_result"><code class=
"xref cpp cpp-func docutils literal notranslate"><span class=
"pre">memcached_fetch_result()
</span></code></a> instead.
</p>
207 <div class=
"section" id=
"description">
208 <h2>DESCRIPTION
<a class=
"headerlink" href=
"#description" title=
"Permalink to this headline">¶
</a></h2>
209 <p><a class=
"reference internal" href=
"#_CPPv415memcached_fetchP12memcached_stPcP6size_tP6size_tP8uint32_tP18memcached_return_t" title=
"memcached_fetch"><code class=
"xref cpp cpp-func docutils literal notranslate"><span class=
"pre">memcached_fetch()
</span></code></a> is used to fetch an individual value from the server.
210 <a class=
"reference internal" href=
"memcached_get.html#_CPPv414memcached_mgetP12memcached_stPPCKcPK6size_t6size_t" title=
"memcached_mget"><code class=
"xref cpp cpp-func docutils literal notranslate"><span class=
"pre">memcached_mget()
</span></code></a> must always be called before using this method.
211 You must pass in a key and its length to fetch the object.
</p>
212 <p>You must supply three pointer variables which will give you the state of the returned
215 <div><ul class=
"simple">
216 <li><p>A
<code class=
"xref cpp cpp-type docutils literal notranslate"><span class=
"pre">uint32_t
</span></code> pointer to contain whatever flags you stored with the value,
</p></li>
217 <li><p>a
<code class=
"xref cpp cpp-type docutils literal notranslate"><span class=
"pre">size_t
</span></code> pointer which will be filled with size of of the object, and
</p></li>
218 <li><p>a
<a class=
"reference internal" href=
"memcached_return_t.html#_CPPv418memcached_return_t" title=
"memcached_return_t"><code class=
"xref cpp cpp-type docutils literal notranslate"><span class=
"pre">memcached_return_t
</span></code></a> pointer to hold any error.
</p></li>
221 <p>The object will be returned upon success and NULL will be returned on failure.
</p>
222 <p><a class=
"reference internal" href=
"memcached_return_t.html#_CPPv4N18memcached_return_t13MEMCACHED_ENDE" title=
"MEMCACHED_END"><code class=
"xref cpp cpp-any docutils literal notranslate"><span class=
"pre">MEMCACHED_END
</span></code></a> is returned by the error value when all objects that have been found are returned.
223 The final value upon
<a class=
"reference internal" href=
"memcached_return_t.html#_CPPv4N18memcached_return_t13MEMCACHED_ENDE" title=
"MEMCACHED_END"><code class=
"xref cpp cpp-any docutils literal notranslate"><span class=
"pre">MEMCACHED_END
</span></code></a> is a NULL pointer.
</p>
224 <p>Values returned by
<a class=
"reference internal" href=
"#_CPPv415memcached_fetchP12memcached_stPcP6size_tP6size_tP8uint32_tP18memcached_return_t" title=
"memcached_fetch"><code class=
"xref cpp cpp-func docutils literal notranslate"><span class=
"pre">memcached_fetch()
</span></code></a> must be freed by the caller.
</p>
225 <p>All of the above functions are not tested when the
226 <a class=
"reference internal" href=
"memcached_behavior.html#_CPPv4N20memcached_behavior_t26MEMCACHED_BEHAVIOR_USE_UDPE" title=
"MEMCACHED_BEHAVIOR_USE_UDP"><code class=
"xref cpp cpp-any docutils literal notranslate"><span class=
"pre">MEMCACHED_BEHAVIOR_USE_UDP
</span></code></a> has been set. Executing any of these
227 functions with this behavior on will result in
<a class=
"reference internal" href=
"memcached_return_t.html#_CPPv4N18memcached_return_t23MEMCACHED_NOT_SUPPORTEDE" title=
"MEMCACHED_NOT_SUPPORTED"><code class=
"xref cpp cpp-any docutils literal notranslate"><span class=
"pre">MEMCACHED_NOT_SUPPORTED
</span></code></a>
228 being returned, or for those functions which do not return a
229 <a class=
"reference internal" href=
"memcached_return_t.html#_CPPv418memcached_return_t" title=
"memcached_return_t"><code class=
"xref cpp cpp-type docutils literal notranslate"><span class=
"pre">memcached_return_t
</span></code></a>, the error function parameter will
230 be set to
<a class=
"reference internal" href=
"memcached_return_t.html#_CPPv4N18memcached_return_t23MEMCACHED_NOT_SUPPORTEDE" title=
"MEMCACHED_NOT_SUPPORTED"><code class=
"xref cpp cpp-any docutils literal notranslate"><span class=
"pre">MEMCACHED_NOT_SUPPORTED
</span></code></a>.
</p>
232 <div class=
"section" id=
"return-value">
233 <h2>RETURN VALUE
<a class=
"headerlink" href=
"#return-value" title=
"Permalink to this headline">¶
</a></h2>
234 <p><a class=
"reference internal" href=
"#_CPPv415memcached_fetchP12memcached_stPcP6size_tP6size_tP8uint32_tP18memcached_return_t" title=
"memcached_fetch"><code class=
"xref cpp cpp-func docutils literal notranslate"><span class=
"pre">memcached_fetch()
</span></code></a> sets error to
235 to
<a class=
"reference internal" href=
"memcached_return_t.html#_CPPv4N18memcached_return_t13MEMCACHED_ENDE" title=
"MEMCACHED_END"><code class=
"xref cpp cpp-any docutils literal notranslate"><span class=
"pre">MEMCACHED_END
</span></code></a> upon successful conclusion.
</p>
236 <p><a class=
"reference internal" href=
"memcached_return_t.html#_CPPv4N18memcached_return_t18MEMCACHED_NOTFOUNDE" title=
"MEMCACHED_NOTFOUND"><code class=
"xref cpp cpp-any docutils literal notranslate"><span class=
"pre">MEMCACHED_NOTFOUND
</span></code></a> will be return if no keys at all were found.
</p>
237 <p><a class=
"reference internal" href=
"memcached_return_t.html#_CPPv4N18memcached_return_t21MEMCACHED_KEY_TOO_BIGE" title=
"MEMCACHED_KEY_TOO_BIG"><code class=
"xref cpp cpp-any docutils literal notranslate"><span class=
"pre">MEMCACHED_KEY_TOO_BIG
</span></code></a> is set to error whenever
<a class=
"reference internal" href=
"#_CPPv415memcached_fetchP12memcached_stPcP6size_tP6size_tP8uint32_tP18memcached_return_t" title=
"memcached_fetch"><code class=
"xref cpp cpp-func docutils literal notranslate"><span class=
"pre">memcached_fetch()
</span></code></a> was used
238 and the key was set larger then
<code class=
"xref cpp cpp-any docutils literal notranslate"><span class=
"pre">MEMCACHED_MAX_KEY
</span></code>, which was the largest
239 key allowed for the original memcached ascii server.
</p>
241 <div class=
"section" id=
"see-also">
242 <h2>SEE ALSO
<a class=
"headerlink" href=
"#see-also" title=
"Permalink to this headline">¶
</a></h2>
244 <li><p><em class=
"manpage"><a class=
"manpage reference external" href=
"https://linux.die.net/man/1/memcached">memcached(
1)
</a></em></p></li>
245 <li><p><a class=
"reference internal" href=
"../libmemcached.html"><span class=
"doc">C/C++ Client Library for memcached
</span></a></p></li>
246 <li><p><a class=
"reference internal" href=
"memcached_strerror.html"><span class=
"doc">Converting Error Codes to Messages
</span></a></p></li>
247 <li><p><a class=
"reference internal" href=
"memcached_get.html"><span class=
"doc">Retrieving data from the server
</span></a></p></li>
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