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152 lines
8.1 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>Set conditions for automatic caching</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.mysqlnd-qc-set-cache-condition" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">mysqlnd_qc_set_cache_condition</h1>
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<p class="verinfo">(PECL mysqlnd_qc >= 1.1.0)</p><p class="refpurpose"><span class="refname">mysqlnd_qc_set_cache_condition</span> — <span class="dc-title">Set conditions for automatic caching</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.mysqlnd-qc-set-cache-condition-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>mysqlnd_qc_set_cache_condition</strong></span>
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( <span class="methodparam">
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<span class="type">int</span>
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<code class="parameter">$condition_type</code>
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</span>
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, <span class="methodparam">
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<span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span>
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<code class="parameter">$condition</code>
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</span>
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, <span class="methodparam">
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<span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span>
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<code class="parameter">$condition_option</code>
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</span>
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) : <span class="type">bool</span></div>
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<p class="para rdfs-comment">
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Sets a condition for automatic caching of statements which do not contain
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the necessary SQL hints to enable caching of them.
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.mysqlnd-qc-set-cache-condition-parameters">
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<h3 class="title">参数</h3>
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<dl>
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<dt>
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<code class="parameter">condition_type</code>
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</dt>
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<dd>
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<p class="para">
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Type of the condition. The only allowed value is
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<strong><code>MYSQLND_QC_CONDITION_META_SCHEMA_PATTERN</code></strong>.
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</p>
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</dd>
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<dt>
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<code class="parameter">condition</code>
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</dt>
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<dd>
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<p class="para">
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Parameter for the condition set with <em>condition_type</em>.
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Parameter type and structure depend on <em>condition_type</em>
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</p>
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<p class="para">
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If <em>condition_type</em> equals
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<em>MYSQLND_QC_CONDITION_META_SCHEMA_PATTERN</em>
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<em>condition</em> must be a string. The string sets a pattern.
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Statements are cached if table and database meta data entry of their result sets
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match the pattern. The pattern is checked for a match with the
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<em>db</em> and <em>org_table</em> meta data entries
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provided by the underlying MySQL client server library. Please, check
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the MySQL Reference manual for details about the two entries. The
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<em>db</em> and <em>org_table</em> values are
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concatenated with a dot (<em>.</em>) before matched
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against <em>condition</em>. Pattern matching supports
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the wildcards <em>%</em> and <em>_</em>.
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The wildcard <em>%</em> will match one or many arbitrary
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characters. <em>_</em> will match one arbitrary character.
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The escape symbol is backslash.
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</p>
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</dd>
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<dt>
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<code class="parameter">condition_option</code>
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</dt>
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<dd>
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<p class="para">
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Option for <em>condition</em>. Type and structure depend
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on <em>condition_type</em>.
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</p>
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<p class="para">
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If <em>condition_type</em> equals
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<em>MYSQLND_QC_CONDITION_META_SCHEMA_PATTERN</em>
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<em>condition_options</em> is the TTL to be used.
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</p>
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</dd>
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</dl>
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</div>
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<div class="refsect1 examples" id="refsect1-function.mysqlnd-qc-set-cache-condition-examples">
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<h3 class="title">范例</h3>
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<div class="example" id="example-2299">
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<p><strong>Example #1 <span class="function"><strong>mysqlnd_qc_set_cache_condition()</strong></span> example</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">/* Cache all accesses to tables with the name "new%" in schema/database "db_example" for 1 second */<br /></span><span style="color: #007700">if (!</span><span style="color: #0000BB">mysqlnd_qc_set_cache_condition</span><span style="color: #007700">(</span><span style="color: #0000BB">MYSQLND_QC_CONDITION_META_SCHEMA_PATTERN</span><span style="color: #007700">, </span><span style="color: #DD0000">"db_example.new%"</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">)) {<br /> die(</span><span style="color: #DD0000">"Failed to set cache condition!"</span><span style="color: #007700">);<br />}<br /><br /></span><span style="color: #0000BB">$mysqli </span><span style="color: #007700">= new </span><span style="color: #0000BB">mysqli</span><span style="color: #007700">(</span><span style="color: #DD0000">"host"</span><span style="color: #007700">, </span><span style="color: #DD0000">"user"</span><span style="color: #007700">, </span><span style="color: #DD0000">"password"</span><span style="color: #007700">, </span><span style="color: #DD0000">"db_example"</span><span style="color: #007700">, </span><span style="color: #DD0000">"port"</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">/* cached although no SQL hint given */<br /></span><span style="color: #0000BB">$mysqli</span><span style="color: #007700">-></span><span style="color: #0000BB">query</span><span style="color: #007700">(</span><span style="color: #DD0000">"SELECT id, title FROM news"</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$pdo_mysql </span><span style="color: #007700">= new </span><span style="color: #0000BB">PDO</span><span style="color: #007700">(</span><span style="color: #DD0000">"mysql:host=host;dbname=db_example;port=port"</span><span style="color: #007700">, </span><span style="color: #DD0000">"user"</span><span style="color: #007700">, </span><span style="color: #DD0000">"password"</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">/* not cached: no SQL hint, no pattern match */<br /></span><span style="color: #0000BB">$pdo_mysql</span><span style="color: #007700">-></span><span style="color: #0000BB">query</span><span style="color: #007700">(</span><span style="color: #DD0000">"SELECT id, title FROM latest_news"</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">/* cached: TTL 1 second, pattern match */<br /></span><span style="color: #0000BB">$pdo_mysql</span><span style="color: #007700">-></span><span style="color: #0000BB">query</span><span style="color: #007700">(</span><span style="color: #DD0000">"SELECT id, title FROM news"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</div>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.mysqlnd-qc-set-cache-condition-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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Returns TRUE on success or FALSE on FAILURE.
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</p>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.mysqlnd-qc-set-cache-condition-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member">
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<a href="mysqlnd_qc.pattern_based_caching.html" class="link">Quickstart: pattern based caching</a>
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</li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |