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 183   <div class="section" id="storing-data-on-the-server">
 184 <h1>Storing data on the server<a class="headerlink" href="#storing-data-on-the-server" title="Permalink to this headline">¶</a></h1>
 185 <div class="section" id="synopsis">
 186 <span id="index-0"></span><h2>SYNOPSIS<a class="headerlink" href="#synopsis" title="Permalink to this headline">¶</a></h2>
 187 <dl class="docutils">
 188 <dt>#include &lt;libmemcached/memcached.h&gt;</dt>
 189 <dd>Compile and link with -lmemcached</dd>
 190 </dl>
 191 <dl class="function">
 192 <dt id="_CPPv413memcached_setP12memcached_stPKc6size_tPKc6size_t6time_t8uint32_t">
 193 <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>
 194 <dd></dd></dl>
 195
 196 <dl class="function">
 197 <dt id="_CPPv413memcached_addP12memcached_stPKc6size_tPKc6size_t6time_t8uint32_t">
 198 <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>
 199 <dd></dd></dl>
 200
 201 <dl class="function">
 202 <dt id="_CPPv417memcached_replaceP12memcached_stPKc6size_tPKc6size_t6time_t8uint32_t">
 203 <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>
 204 <dd></dd></dl>
 205
 206 <dl class="function">
 207 <dt id="_CPPv420memcached_set_by_keyP12memcached_stPKc6size_tPKc6size_tPKc6size_t6time_t8uint32_t">
 208 <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>
 209 <dd></dd></dl>
 210
 211 <dl class="function">
 212 <dt id="_CPPv420memcached_add_by_keyP12memcached_stPKc6size_tPKc6size_tPKc6size_t6time_t8uint32_t">
 213 <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>
 214 <dd></dd></dl>
 215
 216 <dl class="function">
 217 <dt id="_CPPv424memcached_replace_by_keyP12memcached_stPKc6size_tPKc6size_tPKc6size_t6time_t8uint32_t">
 218 <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>
 219 <dd></dd></dl>
 220
 221 </div>
 222 <div class="section" id="description">
 223 <h2>DESCRIPTION<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
 224 <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
 225 all used to store information on the server. All methods take a key, and its
 226 length to store the object. Keys are currently limited to 250 characters when
 227 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
 228 using the text protocol. You must supply both a value and a length. Optionally
 229 you store the object. Keys are currently limited to 250 characters by the
 230 memcached(1) server. You must supply both a value and a length. Optionally you
 231 may test an expiration time for the object and a 16 byte value (it is meant to
 232 be used as a bitmap). &quot;flags&quot; is a 4byte space that is stored alongside of the
 233 main value. Many sub libraries make use of this field, so in most cases users
 234 should avoid making use of it.</p>
 235 <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
 236 already exists it will overwrite what is in the server. If the object does not
 237 exist it will be written. If you are using the non-blocking mode this function
 238 will always return true unless a network error occurs.</p>
 239 <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
 240 found on the server an error occurs.</p>
 241 <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
 242 the server an error occurs, otherwise the value is stored.</p>
 243 <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
 244 <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
 245 key methods. The difference is that they use their group_key parameter to map
 246 objects to particular servers.</p>
 247 <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
 248 is the fastest way to store data on the server.</p>
 249 <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>
 250 behavior enabled. However, when using these operations with this behavior
 251 on, there are limits to the size of the payload being sent to the server.
 252 The reason for these limits is that the Memcached Server does not allow
 253 multi-datagram requests and the current server implementation sets a datagram
 254 size to 1400 bytes. Due to protocol overhead, the actual limit of the user
 255 supplied data is less than 1400 bytes and depends on the protocol in use, as
 256 well as the operation being executed. When running with the binary protocol,
 257 <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
 258 expiry combined may not exceed 1368 bytes. When running with the ASCII protocol,
 259 the exact limit fluctuates depending on which function is being executed and
 260 whether the function is a cas operation or not. For non-cas ASCII set operations,
 261 there are at least 1335 bytes available to split among the key, key_prefix, and
 262 value; for cas ASCII operations there are at least 1318 bytes available to split
 263 among the key, key_prefix and value. If the total size of the command, including
 264 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>
 265 </div>
 266 <div class="section" id="return-value">
 267 <h2>RETURN VALUE<a class="headerlink" href="#return-value" title="Permalink to this headline">¶</a></h2>
 268 <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>
 269 <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>.
 270 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>
 271 <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>
 272 is a legitimate error in the case of a collision.</p>
 273 </div>
 274 <div class="section" id="see-also">
 275 <h2>SEE ALSO<a class="headerlink" href="#see-also" title="Permalink to this headline">¶</a></h2>
 276 <ul class="simple">
 277 <li><em class="manpage"><a class="manpage reference external" href="https://linux.die.net/man/1/memcached">memcached(1)</a></em></li>
 278 <li><a class="reference internal" href="../libmemcached.html"><span class="doc">C/C++ Client Library for memcached</span></a></li>
 279 <li><a class="reference internal" href="memcached_strerror.html"><span class="doc">Converting Error Codes to Messages</span></a></li>
 280 <li><a class="reference internal" href="memcached_auto.html"><span class="doc">Incrementing and Decrementing Values</span></a></li>
 281 <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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