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 191   <div class="section" id="storing-data-on-the-server">
 192 <h1>Storing data on the server<a class="headerlink" href="#storing-data-on-the-server" title="Permalink to this headline">¶</a></h1>
 193 <div class="section" id="synopsis">
 194 <span id="index-0"></span><h2>SYNOPSIS<a class="headerlink" href="#synopsis" title="Permalink to this headline">¶</a></h2>
 195 <dl class="docutils">
 196 <dt>#include &lt;libmemcached/memcached.h&gt;</dt>
 197 <dd>Compile and link with -lmemcached</dd>
 198 </dl>
 199 <dl class="function">
 200 <dt id="_CPPv413memcached_setP12memcached_stPKc6size_tPKc6size_t6time_t8uint32_t">
 201 <span id="_CPPv313memcached_setP12memcached_stPKc6size_tPKc6size_t6time_t8uint32_t"></span><span id="_CPPv213memcached_setP12memcached_stPKc6size_tPKc6size_t6time_t8uint32_t"></span><span id="memcached_set__memcached_stP.cCP.s.cCP.s.time_t.uint32_t"></span><a class="reference internal" href="memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t">memcached_return_t</a> <code class="descname">memcached_set</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>, <em class="property">const</em> char *<em>key</em>, size_t <em>key_length</em>, <em class="property">const</em> char *<em>value</em>, size_t <em>value_length</em>, time_t <em>expiration</em>, uint32_t <em>flags</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv413memcached_setP12memcached_stPKc6size_tPKc6size_t6time_t8uint32_t" title="Permalink to this definition">¶</a><br /></dt>
 202 <dd></dd></dl>
 203
 204 <dl class="function">
 205 <dt id="_CPPv413memcached_addP12memcached_stPKc6size_tPKc6size_t6time_t8uint32_t">
 206 <span id="_CPPv313memcached_addP12memcached_stPKc6size_tPKc6size_t6time_t8uint32_t"></span><span id="_CPPv213memcached_addP12memcached_stPKc6size_tPKc6size_t6time_t8uint32_t"></span><span id="memcached_add__memcached_stP.cCP.s.cCP.s.time_t.uint32_t"></span><a class="reference internal" href="memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t">memcached_return_t</a> <code class="descname">memcached_add</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>, <em class="property">const</em> char *<em>key</em>, size_t <em>key_length</em>, <em class="property">const</em> char *<em>value</em>, size_t <em>value_length</em>, time_t <em>expiration</em>, uint32_t <em>flags</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv413memcached_addP12memcached_stPKc6size_tPKc6size_t6time_t8uint32_t" title="Permalink to this definition">¶</a><br /></dt>
 207 <dd></dd></dl>
 208
 209 <dl class="function">
 210 <dt id="_CPPv417memcached_replaceP12memcached_stPKc6size_tPKc6size_t6time_t8uint32_t">
 211 <span id="_CPPv317memcached_replaceP12memcached_stPKc6size_tPKc6size_t6time_t8uint32_t"></span><span id="_CPPv217memcached_replaceP12memcached_stPKc6size_tPKc6size_t6time_t8uint32_t"></span><span id="memcached_replace__memcached_stP.cCP.s.cCP.s.time_t.uint32_t"></span><a class="reference internal" href="memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t">memcached_return_t</a> <code class="descname">memcached_replace</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>, <em class="property">const</em> char *<em>key</em>, size_t <em>key_length</em>, <em class="property">const</em> char *<em>value</em>, size_t <em>value_length</em>, time_t <em>expiration</em>, uint32_t <em>flags</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv417memcached_replaceP12memcached_stPKc6size_tPKc6size_t6time_t8uint32_t" title="Permalink to this definition">¶</a><br /></dt>
 212 <dd></dd></dl>
 213
 214 <dl class="function">
 215 <dt id="_CPPv420memcached_set_by_keyP12memcached_stPKc6size_tPKc6size_tPKc6size_t6time_t8uint32_t">
 216 <span id="_CPPv320memcached_set_by_keyP12memcached_stPKc6size_tPKc6size_tPKc6size_t6time_t8uint32_t"></span><span id="_CPPv220memcached_set_by_keyP12memcached_stPKc6size_tPKc6size_tPKc6size_t6time_t8uint32_t"></span><span id="memcached_set_by_key__memcached_stP.cCP.s.cCP.s.cCP.s.time_t.uint32_t"></span><a class="reference internal" href="memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t">memcached_return_t</a> <code class="descname">memcached_set_by_key</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>, <em class="property">const</em> char *<em>group_key</em>, size_t <em>group_key_length</em>, <em class="property">const</em> char *<em>key</em>, size_t <em>key_length</em>, <em class="property">const</em> char *<em>value</em>, size_t <em>value_length</em>, time_t <em>expiration</em>, uint32_t <em>flags</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv420memcached_set_by_keyP12memcached_stPKc6size_tPKc6size_tPKc6size_t6time_t8uint32_t" title="Permalink to this definition">¶</a><br /></dt>
 217 <dd></dd></dl>
 218
 219 <dl class="function">
 220 <dt id="_CPPv420memcached_add_by_keyP12memcached_stPKc6size_tPKc6size_tPKc6size_t6time_t8uint32_t">
 221 <span id="_CPPv320memcached_add_by_keyP12memcached_stPKc6size_tPKc6size_tPKc6size_t6time_t8uint32_t"></span><span id="_CPPv220memcached_add_by_keyP12memcached_stPKc6size_tPKc6size_tPKc6size_t6time_t8uint32_t"></span><span id="memcached_add_by_key__memcached_stP.cCP.s.cCP.s.cCP.s.time_t.uint32_t"></span><a class="reference internal" href="memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t">memcached_return_t</a> <code class="descname">memcached_add_by_key</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>, <em class="property">const</em> char *<em>group_key</em>, size_t <em>group_key_length</em>, <em class="property">const</em> char *<em>key</em>, size_t <em>key_length</em>, <em class="property">const</em> char *<em>value</em>, size_t <em>value_length</em>, time_t <em>expiration</em>, uint32_t <em>flags</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv420memcached_add_by_keyP12memcached_stPKc6size_tPKc6size_tPKc6size_t6time_t8uint32_t" title="Permalink to this definition">¶</a><br /></dt>
 222 <dd></dd></dl>
 223
 224 <dl class="function">
 225 <dt id="_CPPv424memcached_replace_by_keyP12memcached_stPKc6size_tPKc6size_tPKc6size_t6time_t8uint32_t">
 226 <span id="_CPPv324memcached_replace_by_keyP12memcached_stPKc6size_tPKc6size_tPKc6size_t6time_t8uint32_t"></span><span id="_CPPv224memcached_replace_by_keyP12memcached_stPKc6size_tPKc6size_tPKc6size_t6time_t8uint32_t"></span><span id="memcached_replace_by_key__memcached_stP.cCP.s.cCP.s.cCP.s.time_t.uint32_t"></span><a class="reference internal" href="memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t">memcached_return_t</a> <code class="descname">memcached_replace_by_key</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>, <em class="property">const</em> char *<em>group_key</em>, size_t <em>group_key_length</em>, <em class="property">const</em> char *<em>key</em>, size_t <em>key_length</em>, <em class="property">const</em> char *<em>value</em>, size_t <em>value_length</em>, time_t <em>expiration</em>, uint32_t <em>flags</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv424memcached_replace_by_keyP12memcached_stPKc6size_tPKc6size_tPKc6size_t6time_t8uint32_t" title="Permalink to this definition">¶</a><br /></dt>
 227 <dd></dd></dl>
 228
 229 </div>
 230 <div class="section" id="description">
 231 <h2>DESCRIPTION<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
 232 <p><a class="reference internal" href="#_CPPv413memcached_setP12memcached_stPKc6size_tPKc6size_t6time_t8uint32_t" title="memcached_set"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_set()</span></code></a>, <a class="reference internal" href="#_CPPv413memcached_addP12memcached_stPKc6size_tPKc6size_t6time_t8uint32_t" title="memcached_add"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_add()</span></code></a>, and <a class="reference internal" href="#_CPPv417memcached_replaceP12memcached_stPKc6size_tPKc6size_t6time_t8uint32_t" title="memcached_replace"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_replace()</span></code></a> are
 233 all used to store information on the server. All methods take a key, and its
 234 length to store the object. Keys are currently limited to 250 characters when
 235 using either a version of <em class="manpage"><a class="manpage reference external" href="https://linux.die.net/man/1/memcached">memcached(1)</a></em> which is 1.4 or below, or when
 236 using the text protocol. You must supply both a value and a length. Optionally
 237 you store the object. Keys are currently limited to 250 characters by the
 238 memcached(1) server. You must supply both a value and a length. Optionally you
 239 may test an expiration time for the object and a 16 byte value (it is meant to
 240 be used as a bitmap). &quot;flags&quot; is a 4byte space that is stored alongside of the
 241 main value. Many sub libraries make use of this field, so in most cases users
 242 should avoid making use of it.</p>
 243 <p><a class="reference internal" href="#_CPPv413memcached_setP12memcached_stPKc6size_tPKc6size_t6time_t8uint32_t" title="memcached_set"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_set()</span></code></a> will write an object to the server. If an object
 244 already exists it will overwrite what is in the server. If the object does not
 245 exist it will be written. If you are using the non-blocking mode this function
 246 will always return true unless a network error occurs.</p>
 247 <p><a class="reference internal" href="#_CPPv417memcached_replaceP12memcached_stPKc6size_tPKc6size_t6time_t8uint32_t" title="memcached_replace"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_replace()</span></code></a> replaces an object on the server. If the object is not
 248 found on the server an error occurs.</p>
 249 <p><a class="reference internal" href="#_CPPv413memcached_addP12memcached_stPKc6size_tPKc6size_t6time_t8uint32_t" title="memcached_add"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_add()</span></code></a> adds an object to the server. If the object is found on
 250 the server an error occurs, otherwise the value is stored.</p>
 251 <p><a class="reference internal" href="#_CPPv420memcached_set_by_keyP12memcached_stPKc6size_tPKc6size_tPKc6size_t6time_t8uint32_t" title="memcached_set_by_key"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_set_by_key()</span></code></a>, <a class="reference internal" href="#_CPPv420memcached_add_by_keyP12memcached_stPKc6size_tPKc6size_tPKc6size_t6time_t8uint32_t" title="memcached_add_by_key"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_add_by_key()</span></code></a>, and
 252 <a class="reference internal" href="#_CPPv424memcached_replace_by_keyP12memcached_stPKc6size_tPKc6size_tPKc6size_t6time_t8uint32_t" title="memcached_replace_by_key"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_replace_by_key()</span></code></a> methods all behave in a similar method as the non
 253 key methods. The difference is that they use their group_key parameter to map
 254 objects to particular servers.</p>
 255 <p>If you are looking for performance, <a class="reference internal" href="#_CPPv413memcached_setP12memcached_stPKc6size_tPKc6size_t6time_t8uint32_t" title="memcached_set"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_set()</span></code></a> with non-blocking IO
 256 is the fastest way to store data on the server.</p>
 257 <p>All of the above functions are tested with the <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>
 258 behavior enabled. However, when using these operations with this behavior
 259 on, there are limits to the size of the payload being sent to the server.
 260 The reason for these limits is that the Memcached Server does not allow
 261 multi-datagram requests and the current server implementation sets a datagram
 262 size to 1400 bytes. Due to protocol overhead, the actual limit of the user
 263 supplied data is less than 1400 bytes and depends on the protocol in use, as
 264 well as the operation being executed. When running with the binary protocol,
 265 <a class="reference internal" href="memcached_behavior.html#_CPPv4N20memcached_behavior_t34MEMCACHED_BEHAVIOR_BINARY_PROTOCOLE" title="MEMCACHED_BEHAVIOR_BINARY_PROTOCOL"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_BEHAVIOR_BINARY_PROTOCOL</span></code></a>, the size of the key,value, flags and
 266 expiry combined may not exceed 1368 bytes. When running with the ASCII protocol,
 267 the exact limit fluctuates depending on which function is being executed and
 268 whether the function is a cas operation or not. For non-cas ASCII set operations,
 269 there are at least 1335 bytes available to split among the key, key_prefix, and
 270 value; for cas ASCII operations there are at least 1318 bytes available to split
 271 among the key, key_prefix and value. If the total size of the command, including
 272 overhead, exceeds 1400 bytes, a <a class="reference internal" href="memcached_return_t.html#_CPPv4N18memcached_return_t23MEMCACHED_WRITE_FAILUREE" title="MEMCACHED_WRITE_FAILURE"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_WRITE_FAILURE</span></code></a> will be returned.</p>
 273 </div>
 274 <div class="section" id="return-value">
 275 <h2>RETURN VALUE<a class="headerlink" href="#return-value" title="Permalink to this headline">¶</a></h2>
 276 <p>All methods return a value of type <a class="reference internal" href="memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_return_t</span></code></a>.</p>
 277 <p>On success the value will be <a class="reference internal" href="memcached_return_t.html#_CPPv4N18memcached_return_t17MEMCACHED_SUCCESSE" title="MEMCACHED_SUCCESS"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_SUCCESS</span></code></a>.
 278 Use <a class="reference internal" href="memcached_strerror.html#_CPPv418memcached_strerrorP12memcached_st18memcached_return_t" title="memcached_strerror"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_strerror()</span></code></a> to translate this value to a printable string.</p>
 279 <p>For <a class="reference internal" href="#_CPPv417memcached_replaceP12memcached_stPKc6size_tPKc6size_t6time_t8uint32_t" title="memcached_replace"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_replace()</span></code></a> and <a class="reference internal" href="#_CPPv413memcached_addP12memcached_stPKc6size_tPKc6size_t6time_t8uint32_t" title="memcached_add"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_add()</span></code></a>, <a class="reference internal" href="memcached_return_t.html#_CPPv4N18memcached_return_t19MEMCACHED_NOTSTOREDE" title="MEMCACHED_NOTSTORED"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_NOTSTORED</span></code></a>
 280 is a legitimate error in the case of a collision.</p>
 281 </div>
 282 <div class="section" id="see-also">
 283 <h2>SEE ALSO<a class="headerlink" href="#see-also" title="Permalink to this headline">¶</a></h2>
 284 <ul class="simple">
 285 <li><em class="manpage"><a class="manpage reference external" href="https://linux.die.net/man/1/memcached">memcached(1)</a></em></li>
 286 <li><a class="reference internal" href="../libmemcached.html"><span class="doc">C/C++ Client Library for memcached</span></a></li>
 287 <li><a class="reference internal" href="memcached_strerror.html"><span class="doc">Converting Error Codes to Messages</span></a></li>
 288 <li><a class="reference internal" href="memcached_auto.html"><span class="doc">Incrementing and Decrementing Values</span></a></li>
 289 <li><a class="reference internal" href="memcached_cas.html"><span class="doc">Working with data on the server in an atomic fashion</span></a></li>
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