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</a></li>
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</a></li>
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176 <li>Working with result sets
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194 <h1>Working with result sets
<a class=
"headerlink" href=
"#working-with-result-sets" title=
"Permalink to this headline">¶
</a></h1>
195 <div class=
"section" id=
"synopsis">
196 <h2>SYNOPSIS
<a class=
"headerlink" href=
"#synopsis" title=
"Permalink to this headline">¶
</a></h2>
197 <p>#include
<libmemcached/memcached_pool.h
></p>
199 <dt id=
"_CPPv419memcached_result_st">
200 <span id=
"_CPPv319memcached_result_st"></span><span id=
"_CPPv219memcached_result_st"></span><span id=
"memcached_result_st"></span><em class=
"property">type
</em><code class=
"sig-name descname">memcached_result_st
</code><a class=
"headerlink" href=
"#_CPPv419memcached_result_st" title=
"Permalink to this definition">¶
</a><br /></dt>
203 <dl class=
"function">
204 <dt id=
"_CPPv423memcached_result_createP12memcached_stP19memcached_result_st">
205 <span id=
"_CPPv323memcached_result_createP12memcached_stP19memcached_result_st"></span><span id=
"_CPPv223memcached_result_createP12memcached_stP19memcached_result_st"></span><span id=
"memcached_result_create__memcached_stP.memcached_result_stP"></span><a class=
"reference internal" href=
"#_CPPv419memcached_result_st" title=
"memcached_result_st">memcached_result_st
</a> *
<code class=
"sig-name descname">memcached_result_create
</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>,
<a class=
"reference internal" href=
"#_CPPv419memcached_result_st" title=
"memcached_result_st">memcached_result_st
</a> *
<em>result
</em><span class=
"sig-paren">)
</span><a class=
"headerlink" href=
"#_CPPv423memcached_result_createP12memcached_stP19memcached_result_st" title=
"Permalink to this definition">¶
</a><br /></dt>
208 <dl class=
"function">
209 <dt id=
"_CPPv421memcached_result_freeP19memcached_result_st">
210 <span id=
"_CPPv321memcached_result_freeP19memcached_result_st"></span><span id=
"_CPPv221memcached_result_freeP19memcached_result_st"></span><span id=
"memcached_result_free__memcached_result_stP"></span>void
<code class=
"sig-name descname">memcached_result_free
</code><span class=
"sig-paren">(
</span><a class=
"reference internal" href=
"#_CPPv419memcached_result_st" title=
"memcached_result_st">memcached_result_st
</a> *
<em>result
</em><span class=
"sig-paren">)
</span><a class=
"headerlink" href=
"#_CPPv421memcached_result_freeP19memcached_result_st" title=
"Permalink to this definition">¶
</a><br /></dt>
213 <dl class=
"function">
214 <dt id=
"_CPPv426memcached_result_key_valueP19memcached_result_st">
215 <span id=
"_CPPv326memcached_result_key_valueP19memcached_result_st"></span><span id=
"_CPPv226memcached_result_key_valueP19memcached_result_st"></span><span id=
"memcached_result_key_value__memcached_result_stP"></span><em class=
"property">const
</em> char *
<code class=
"sig-name descname">memcached_result_key_value
</code><span class=
"sig-paren">(
</span><a class=
"reference internal" href=
"#_CPPv419memcached_result_st" title=
"memcached_result_st">memcached_result_st
</a> *
<em>result
</em><span class=
"sig-paren">)
</span><a class=
"headerlink" href=
"#_CPPv426memcached_result_key_valueP19memcached_result_st" title=
"Permalink to this definition">¶
</a><br /></dt>
218 <dl class=
"function">
219 <dt id=
"_CPPv427memcached_result_key_lengthPK19memcached_result_st">
220 <span id=
"_CPPv327memcached_result_key_lengthPK19memcached_result_st"></span><span id=
"_CPPv227memcached_result_key_lengthPK19memcached_result_st"></span><span id=
"memcached_result_key_length__memcached_result_stCP"></span>size_t
<code class=
"sig-name descname">memcached_result_key_length
</code><span class=
"sig-paren">(
</span><em class=
"property">const
</em> <a class=
"reference internal" href=
"#_CPPv419memcached_result_st" title=
"memcached_result_st">memcached_result_st
</a> *
<em>result
</em><span class=
"sig-paren">)
</span><a class=
"headerlink" href=
"#_CPPv427memcached_result_key_lengthPK19memcached_result_st" title=
"Permalink to this definition">¶
</a><br /></dt>
223 <dl class=
"function">
224 <dt id=
"_CPPv422memcached_result_valueP19memcached_result_st">
225 <span id=
"_CPPv322memcached_result_valueP19memcached_result_st"></span><span id=
"_CPPv222memcached_result_valueP19memcached_result_st"></span><span id=
"memcached_result_value__memcached_result_stP"></span><em class=
"property">const
</em> char *
<code class=
"sig-name descname">memcached_result_value
</code><span class=
"sig-paren">(
</span><a class=
"reference internal" href=
"#_CPPv419memcached_result_st" title=
"memcached_result_st">memcached_result_st
</a> *
<em>ptr
</em><span class=
"sig-paren">)
</span><a class=
"headerlink" href=
"#_CPPv422memcached_result_valueP19memcached_result_st" title=
"Permalink to this definition">¶
</a><br /></dt>
228 <dl class=
"function">
229 <dt id=
"_CPPv427memcached_result_take_valueP19memcached_result_st">
230 <span id=
"_CPPv327memcached_result_take_valueP19memcached_result_st"></span><span id=
"_CPPv227memcached_result_take_valueP19memcached_result_st"></span><span id=
"memcached_result_take_value__memcached_result_stP"></span>char *
<code class=
"sig-name descname">memcached_result_take_value
</code><span class=
"sig-paren">(
</span><a class=
"reference internal" href=
"#_CPPv419memcached_result_st" title=
"memcached_result_st">memcached_result_st
</a> *
<em>ptr
</em><span class=
"sig-paren">)
</span><a class=
"headerlink" href=
"#_CPPv427memcached_result_take_valueP19memcached_result_st" title=
"Permalink to this definition">¶
</a><br /></dt>
233 <dl class=
"function">
234 <dt id=
"_CPPv423memcached_result_lengthPK19memcached_result_st">
235 <span id=
"_CPPv323memcached_result_lengthPK19memcached_result_st"></span><span id=
"_CPPv223memcached_result_lengthPK19memcached_result_st"></span><span id=
"memcached_result_length__memcached_result_stCP"></span>size_t
<code class=
"sig-name descname">memcached_result_length
</code><span class=
"sig-paren">(
</span><em class=
"property">const
</em> <a class=
"reference internal" href=
"#_CPPv419memcached_result_st" title=
"memcached_result_st">memcached_result_st
</a> *
<em>ptr
</em><span class=
"sig-paren">)
</span><a class=
"headerlink" href=
"#_CPPv423memcached_result_lengthPK19memcached_result_st" title=
"Permalink to this definition">¶
</a><br /></dt>
238 <dl class=
"function">
239 <dt id=
"_CPPv422memcached_result_flagsPK19memcached_result_st">
240 <span id=
"_CPPv322memcached_result_flagsPK19memcached_result_st"></span><span id=
"_CPPv222memcached_result_flagsPK19memcached_result_st"></span><span id=
"memcached_result_flags__memcached_result_stCP"></span>uint32_t
<code class=
"sig-name descname">memcached_result_flags
</code><span class=
"sig-paren">(
</span><em class=
"property">const
</em> <a class=
"reference internal" href=
"#_CPPv419memcached_result_st" title=
"memcached_result_st">memcached_result_st
</a> *
<em>result
</em><span class=
"sig-paren">)
</span><a class=
"headerlink" href=
"#_CPPv422memcached_result_flagsPK19memcached_result_st" title=
"Permalink to this definition">¶
</a><br /></dt>
243 <dl class=
"function">
244 <dt id=
"_CPPv420memcached_result_casPK19memcached_result_st">
245 <span id=
"_CPPv320memcached_result_casPK19memcached_result_st"></span><span id=
"_CPPv220memcached_result_casPK19memcached_result_st"></span><span id=
"memcached_result_cas__memcached_result_stCP"></span>uint64_t
<code class=
"sig-name descname">memcached_result_cas
</code><span class=
"sig-paren">(
</span><em class=
"property">const
</em> <a class=
"reference internal" href=
"#_CPPv419memcached_result_st" title=
"memcached_result_st">memcached_result_st
</a> *
<em>result
</em><span class=
"sig-paren">)
</span><a class=
"headerlink" href=
"#_CPPv420memcached_result_casPK19memcached_result_st" title=
"Permalink to this definition">¶
</a><br /></dt>
248 <dl class=
"function">
249 <dt id=
"_CPPv426memcached_result_set_valueP19memcached_result_stPKc6size_t">
250 <span id=
"_CPPv326memcached_result_set_valueP19memcached_result_stPKc6size_t"></span><span id=
"_CPPv226memcached_result_set_valueP19memcached_result_stPKc6size_t"></span><span id=
"memcached_result_set_value__memcached_result_stP.cCP.s"></span><a class=
"reference internal" href=
"memcached_return_t.html#_CPPv418memcached_return_t" title=
"memcached_return_t">memcached_return_t
</a> <code class=
"sig-name descname">memcached_result_set_value
</code><span class=
"sig-paren">(
</span><a class=
"reference internal" href=
"#_CPPv419memcached_result_st" title=
"memcached_result_st">memcached_result_st
</a> *
<em>ptr
</em>,
<em class=
"property">const
</em> char *
<em>value
</em>, size_t
<em>length
</em><span class=
"sig-paren">)
</span><a class=
"headerlink" href=
"#_CPPv426memcached_result_set_valueP19memcached_result_stPKc6size_t" title=
"Permalink to this definition">¶
</a><br /></dt>
253 <dl class=
"function">
254 <dt id=
"_CPPv426memcached_result_set_flagsP19memcached_result_st8uint32_t">
255 <span id=
"_CPPv326memcached_result_set_flagsP19memcached_result_st8uint32_t"></span><span id=
"_CPPv226memcached_result_set_flagsP19memcached_result_st8uint32_t"></span><span id=
"memcached_result_set_flags__memcached_result_stP.uint32_t"></span>void
<code class=
"sig-name descname">memcached_result_set_flags
</code><span class=
"sig-paren">(
</span><a class=
"reference internal" href=
"#_CPPv419memcached_result_st" title=
"memcached_result_st">memcached_result_st
</a> *
<em>ptr
</em>, uint32_t
<em>flags
</em><span class=
"sig-paren">)
</span><a class=
"headerlink" href=
"#_CPPv426memcached_result_set_flagsP19memcached_result_st8uint32_t" title=
"Permalink to this definition">¶
</a><br /></dt>
258 <dl class=
"function">
259 <dt id=
"_CPPv431memcached_result_set_expirationP19memcached_result_st6time_t">
260 <span id=
"_CPPv331memcached_result_set_expirationP19memcached_result_st6time_t"></span><span id=
"_CPPv231memcached_result_set_expirationP19memcached_result_st6time_t"></span><span id=
"memcached_result_set_expiration__memcached_result_stP.time_t"></span>void
<code class=
"sig-name descname">memcached_result_set_expiration
</code><span class=
"sig-paren">(
</span><a class=
"reference internal" href=
"#_CPPv419memcached_result_st" title=
"memcached_result_st">memcached_result_st
</a> *
<em>ptr
</em>, time_t
<span class=
"sig-paren">)
</span><a class=
"headerlink" href=
"#_CPPv431memcached_result_set_expirationP19memcached_result_st6time_t" title=
"Permalink to this definition">¶
</a><br /></dt>
263 <p>Compile and link with -lmemcachedutil -lmemcached
</p>
265 <div class=
"section" id=
"description">
266 <h2>DESCRIPTION
<a class=
"headerlink" href=
"#description" title=
"Permalink to this headline">¶
</a></h2>
267 <p>libmemcached(
3) can optionally return a
<a class=
"reference internal" href=
"#_CPPv419memcached_result_st" title=
"memcached_result_st"><code class=
"xref cpp cpp-type docutils literal notranslate"><span class=
"pre">memcached_result_st
</span></code></a> which
268 acts as a result object. The result objects have added benefits over the
269 character pointer returns, in that they are forward compatible with new
270 return items that future memcached servers may implement (the best current
271 example of this is the CAS return item). The structures can also be reused,
272 which will save on calls to malloc(
3). It is suggested that you use result
273 objects over char * return functions.
</p>
274 <p>The structure of
<a class=
"reference internal" href=
"#_CPPv419memcached_result_st" title=
"memcached_result_st"><code class=
"xref cpp cpp-type docutils literal notranslate"><span class=
"pre">memcached_result_st
</span></code></a> has been encapsulated, you should
275 not write code to directly access members of the structure.
</p>
276 <p><a class=
"reference internal" href=
"#_CPPv423memcached_result_createP12memcached_stP19memcached_result_st" title=
"memcached_result_create"><code class=
"xref cpp cpp-func docutils literal notranslate"><span class=
"pre">memcached_result_create()
</span></code></a> will either allocate memory for a
277 <a class=
"reference internal" href=
"#_CPPv419memcached_result_st" title=
"memcached_result_st"><code class=
"xref cpp cpp-type docutils literal notranslate"><span class=
"pre">memcached_result_st
</span></code></a> or will initialize a structure passed to it.
</p>
278 <p><a class=
"reference internal" href=
"#_CPPv421memcached_result_freeP19memcached_result_st" title=
"memcached_result_free"><code class=
"xref cpp cpp-func docutils literal notranslate"><span class=
"pre">memcached_result_free()
</span></code></a> will deallocate any memory attached to the
279 structure. If the structure was also allocated, it will deallocate it.
</p>
280 <p><a class=
"reference internal" href=
"#_CPPv426memcached_result_key_valueP19memcached_result_st" title=
"memcached_result_key_value"><code class=
"xref cpp cpp-func docutils literal notranslate"><span class=
"pre">memcached_result_key_value()
</span></code></a> returns the key value associated with the
281 current result object.
</p>
282 <p><a class=
"reference internal" href=
"#_CPPv427memcached_result_key_lengthPK19memcached_result_st" title=
"memcached_result_key_length"><code class=
"xref cpp cpp-func docutils literal notranslate"><span class=
"pre">memcached_result_key_length()
</span></code></a> returns the key length associated with
283 the current result object.
</p>
284 <p><a class=
"reference internal" href=
"#_CPPv422memcached_result_valueP19memcached_result_st" title=
"memcached_result_value"><code class=
"xref cpp cpp-func docutils literal notranslate"><span class=
"pre">memcached_result_value()
</span></code></a> returns the result value associated with the
285 current result object.
</p>
286 <p><a class=
"reference internal" href=
"#_CPPv427memcached_result_take_valueP19memcached_result_st" title=
"memcached_result_take_value"><code class=
"xref cpp cpp-func docutils literal notranslate"><span class=
"pre">memcached_result_take_value()
</span></code></a> returns and hands over the result value
287 associated with the current result object. You must call free() to release this
288 value, unless you have made use of a custom allocator. Use of a custom
289 allocator requires that you create your own custom free() to release it.
</p>
290 <p><a class=
"reference internal" href=
"#_CPPv423memcached_result_lengthPK19memcached_result_st" title=
"memcached_result_length"><code class=
"xref cpp cpp-func docutils literal notranslate"><span class=
"pre">memcached_result_length()
</span></code></a> returns the result length associated with
291 the current result object.
</p>
292 <p><a class=
"reference internal" href=
"#_CPPv422memcached_result_flagsPK19memcached_result_st" title=
"memcached_result_flags"><code class=
"xref cpp cpp-func docutils literal notranslate"><span class=
"pre">memcached_result_flags()
</span></code></a> returns the flags associated with the
293 current result object.
</p>
294 <p><a class=
"reference internal" href=
"#_CPPv420memcached_result_casPK19memcached_result_st" title=
"memcached_result_cas"><code class=
"xref cpp cpp-func docutils literal notranslate"><span class=
"pre">memcached_result_cas()
</span></code></a> returns the cas associated with the
295 current result object. This value will only be available if the server
297 <p><a class=
"reference internal" href=
"#_CPPv426memcached_result_set_valueP19memcached_result_stPKc6size_t" title=
"memcached_result_set_value"><code class=
"xref cpp cpp-func docutils literal notranslate"><span class=
"pre">memcached_result_set_value()
</span></code></a> takes a byte array and a size and sets
298 the result to this value. This function is used for trigger responses.
</p>
299 <p><a class=
"reference internal" href=
"#_CPPv426memcached_result_set_flagsP19memcached_result_st8uint32_t" title=
"memcached_result_set_flags"><code class=
"xref cpp cpp-func docutils literal notranslate"><span class=
"pre">memcached_result_set_flags()
</span></code></a> takes a result structure and stores a new
300 value for the flags field.
</p>
301 <p><a class=
"reference internal" href=
"#_CPPv431memcached_result_set_expirationP19memcached_result_st6time_t" title=
"memcached_result_set_expiration"><code class=
"xref cpp cpp-func docutils literal notranslate"><span class=
"pre">memcached_result_set_expiration()
</span></code></a> takes a result structure and stores
302 a new value for the expiration field (this is only used by read through
304 <p>You may wish to avoid using memcached_result_create(
3) with a
305 stack based allocation. The most common issues related to ABI safety involve
306 heap allocated structures.
</p>
308 <div class=
"section" id=
"return">
309 <h2>RETURN
<a class=
"headerlink" href=
"#return" title=
"Permalink to this headline">¶
</a></h2>
310 <p>Varies, see particular functions. All structures must have
311 <a class=
"reference internal" href=
"#_CPPv421memcached_result_freeP19memcached_result_st" title=
"memcached_result_free"><code class=
"xref cpp cpp-func docutils literal notranslate"><span class=
"pre">memcached_result_free()
</span></code></a> called on them for cleanup purposes. Failure
312 to do this will result in leaked memory.
</p>
314 <div class=
"section" id=
"see-also">
315 <h2>SEE ALSO
<a class=
"headerlink" href=
"#see-also" title=
"Permalink to this headline">¶
</a></h2>
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"rst-footer-buttons" role=
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"footer navigation">
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"btn btn-neutral float-right" title=
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