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  125. <li class="toctree-l2"><a class="reference internal" href="../libraries/zip.html">Zip Encoding Class</a></li>
  126. </ul>
  127. </li>
  128. </ul>
  129. <ul class="current">
  130. <li class="toctree-l1 current"><a class="reference internal" href="index.html">Database Reference</a><ul class="current">
  131. <li class="toctree-l2"><a class="reference internal" href="examples.html">Quick Start: Usage Examples</a></li>
  132. <li class="toctree-l2"><a class="reference internal" href="configuration.html">Database Configuration</a></li>
  133. <li class="toctree-l2"><a class="reference internal" href="connecting.html">Connecting to a Database</a></li>
  134. <li class="toctree-l2"><a class="reference internal" href="queries.html">Running Queries</a></li>
  135. <li class="toctree-l2"><a class="reference internal" href="results.html">Generating Query Results</a></li>
  136. <li class="toctree-l2"><a class="reference internal" href="helpers.html">Query Helper Functions</a></li>
  137. <li class="toctree-l2"><a class="reference internal" href="query_builder.html">Query Builder Class</a></li>
  138. <li class="toctree-l2"><a class="reference internal" href="transactions.html">Transactions</a></li>
  139. <li class="toctree-l2 current"><a class="current reference internal" href="#">Getting MetaData</a></li>
  140. <li class="toctree-l2"><a class="reference internal" href="call_function.html">Custom Function Calls</a></li>
  141. <li class="toctree-l2"><a class="reference internal" href="caching.html">Query Caching</a></li>
  142. <li class="toctree-l2"><a class="reference internal" href="forge.html">Database Manipulation with Database Forge</a></li>
  143. <li class="toctree-l2"><a class="reference internal" href="utilities.html">Database Utilities Class</a></li>
  144. <li class="toctree-l2"><a class="reference internal" href="db_driver_reference.html">Database Driver Reference</a></li>
  145. </ul>
  146. </li>
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  148. <ul>
  149. <li class="toctree-l1"><a class="reference internal" href="../helpers/index.html">Helpers</a><ul>
  150. <li class="toctree-l2"><a class="reference internal" href="../helpers/array_helper.html">Array Helper</a></li>
  151. <li class="toctree-l2"><a class="reference internal" href="../helpers/captcha_helper.html">CAPTCHA Helper</a></li>
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  153. <li class="toctree-l2"><a class="reference internal" href="../helpers/date_helper.html">Date Helper</a></li>
  154. <li class="toctree-l2"><a class="reference internal" href="../helpers/directory_helper.html">Directory Helper</a></li>
  155. <li class="toctree-l2"><a class="reference internal" href="../helpers/download_helper.html">Download Helper</a></li>
  156. <li class="toctree-l2"><a class="reference internal" href="../helpers/email_helper.html">Email Helper</a></li>
  157. <li class="toctree-l2"><a class="reference internal" href="../helpers/file_helper.html">File Helper</a></li>
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  159. <li class="toctree-l2"><a class="reference internal" href="../helpers/html_helper.html">HTML Helper</a></li>
  160. <li class="toctree-l2"><a class="reference internal" href="../helpers/inflector_helper.html">Inflector Helper</a></li>
  161. <li class="toctree-l2"><a class="reference internal" href="../helpers/language_helper.html">Language Helper</a></li>
  162. <li class="toctree-l2"><a class="reference internal" href="../helpers/number_helper.html">Number Helper</a></li>
  163. <li class="toctree-l2"><a class="reference internal" href="../helpers/path_helper.html">Path Helper</a></li>
  164. <li class="toctree-l2"><a class="reference internal" href="../helpers/security_helper.html">Security Helper</a></li>
  165. <li class="toctree-l2"><a class="reference internal" href="../helpers/smiley_helper.html">Smiley Helper</a></li>
  166. <li class="toctree-l2"><a class="reference internal" href="../helpers/string_helper.html">String Helper</a></li>
  167. <li class="toctree-l2"><a class="reference internal" href="../helpers/text_helper.html">Text Helper</a></li>
  168. <li class="toctree-l2"><a class="reference internal" href="../helpers/typography_helper.html">Typography Helper</a></li>
  169. <li class="toctree-l2"><a class="reference internal" href="../helpers/url_helper.html">URL Helper</a></li>
  170. <li class="toctree-l2"><a class="reference internal" href="../helpers/xml_helper.html">XML Helper</a></li>
  171. </ul>
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  357. <li><a href="../index.html">Docs</a> &raquo;</li>
  358. <li><a href="index.html">Database Reference</a> &raquo;</li>
  359. <li>Database Metadata</li>
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  364. </div>
  365. </ul>
  366. <hr/>
  367. </div>
  368. <div role="main" class="document">
  369. <div class="section" id="database-metadata">
  370. <h1>Database Metadata<a class="headerlink" href="#database-metadata" title="Permalink to this headline">¶</a></h1>
  371. <div class="section" id="table-metadata">
  372. <h2>Table MetaData<a class="headerlink" href="#table-metadata" title="Permalink to this headline">¶</a></h2>
  373. <p>These functions let you fetch table information.</p>
  374. <div class="section" id="list-the-tables-in-your-database">
  375. <h3>List the Tables in Your Database<a class="headerlink" href="#list-the-tables-in-your-database" title="Permalink to this headline">¶</a></h3>
  376. <p><strong>$this-&gt;db-&gt;list_tables();</strong></p>
  377. <p>Returns an array containing the names of all the tables in the database
  378. you are currently connected to. Example:</p>
  379. <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$tables</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">list_tables</span><span class="p">();</span>
  380. <span class="k">foreach</span> <span class="p">(</span><span class="nv">$tables</span> <span class="k">as</span> <span class="nv">$table</span><span class="p">)</span>
  381. <span class="p">{</span>
  382. <span class="k">echo</span> <span class="nv">$table</span><span class="p">;</span>
  383. <span class="p">}</span>
  384. </pre></div>
  385. </div>
  386. </div>
  387. <div class="section" id="determine-if-a-table-exists">
  388. <h3>Determine If a Table Exists<a class="headerlink" href="#determine-if-a-table-exists" title="Permalink to this headline">¶</a></h3>
  389. <p><strong>$this-&gt;db-&gt;table_exists();</strong></p>
  390. <p>Sometimes it’s helpful to know whether a particular table exists before
  391. running an operation on it. Returns a boolean TRUE/FALSE. Usage example:</p>
  392. <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">table_exists</span><span class="p">(</span><span class="s1">&#39;table_name&#39;</span><span class="p">))</span>
  393. <span class="p">{</span>
  394. <span class="c1">// some code...</span>
  395. <span class="p">}</span>
  396. </pre></div>
  397. </div>
  398. <div class="admonition note">
  399. <p class="first admonition-title">Note</p>
  400. <p class="last">Replace <em>table_name</em> with the name of the table you are looking for.</p>
  401. </div>
  402. </div>
  403. </div>
  404. <div class="section" id="field-metadata">
  405. <h2>Field MetaData<a class="headerlink" href="#field-metadata" title="Permalink to this headline">¶</a></h2>
  406. <div class="section" id="list-the-fields-in-a-table">
  407. <h3>List the Fields in a Table<a class="headerlink" href="#list-the-fields-in-a-table" title="Permalink to this headline">¶</a></h3>
  408. <p><strong>$this-&gt;db-&gt;list_fields()</strong></p>
  409. <p>Returns an array containing the field names. This query can be called
  410. two ways:</p>
  411. <p>1. You can supply the table name and call it from the $this-&gt;db-&gt;
  412. object:</p>
  413. <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$fields</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">list_fields</span><span class="p">(</span><span class="s1">&#39;table_name&#39;</span><span class="p">);</span>
  414. <span class="k">foreach</span> <span class="p">(</span><span class="nv">$fields</span> <span class="k">as</span> <span class="nv">$field</span><span class="p">)</span>
  415. <span class="p">{</span>
  416. <span class="k">echo</span> <span class="nv">$field</span><span class="p">;</span>
  417. <span class="p">}</span>
  418. </pre></div>
  419. </div>
  420. <p>2. You can gather the field names associated with any query you run by
  421. calling the function from your query result object:</p>
  422. <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$query</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">query</span><span class="p">(</span><span class="s1">&#39;SELECT * FROM some_table&#39;</span><span class="p">);</span>
  423. <span class="k">foreach</span> <span class="p">(</span><span class="nv">$query</span><span class="o">-&gt;</span><span class="na">list_fields</span><span class="p">()</span> <span class="k">as</span> <span class="nv">$field</span><span class="p">)</span>
  424. <span class="p">{</span>
  425. <span class="k">echo</span> <span class="nv">$field</span><span class="p">;</span>
  426. <span class="p">}</span>
  427. </pre></div>
  428. </div>
  429. </div>
  430. <div class="section" id="determine-if-a-field-is-present-in-a-table">
  431. <h3>Determine If a Field is Present in a Table<a class="headerlink" href="#determine-if-a-field-is-present-in-a-table" title="Permalink to this headline">¶</a></h3>
  432. <p><strong>$this-&gt;db-&gt;field_exists()</strong></p>
  433. <p>Sometimes it’s helpful to know whether a particular field exists before
  434. performing an action. Returns a boolean TRUE/FALSE. Usage example:</p>
  435. <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">field_exists</span><span class="p">(</span><span class="s1">&#39;field_name&#39;</span><span class="p">,</span> <span class="s1">&#39;table_name&#39;</span><span class="p">))</span>
  436. <span class="p">{</span>
  437. <span class="c1">// some code...</span>
  438. <span class="p">}</span>
  439. </pre></div>
  440. </div>
  441. <div class="admonition note">
  442. <p class="first admonition-title">Note</p>
  443. <p class="last">Replace <em>field_name</em> with the name of the column you are looking
  444. for, and replace <em>table_name</em> with the name of the table you are
  445. looking for.</p>
  446. </div>
  447. </div>
  448. <div class="section" id="retrieve-field-metadata">
  449. <h3>Retrieve Field Metadata<a class="headerlink" href="#retrieve-field-metadata" title="Permalink to this headline">¶</a></h3>
  450. <p><strong>$this-&gt;db-&gt;field_data()</strong></p>
  451. <p>Returns an array of objects containing field information.</p>
  452. <p>Sometimes it’s helpful to gather the field names or other metadata, like
  453. the column type, max length, etc.</p>
  454. <div class="admonition note">
  455. <p class="first admonition-title">Note</p>
  456. <p class="last">Not all databases provide meta-data.</p>
  457. </div>
  458. <p>Usage example:</p>
  459. <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$fields</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">field_data</span><span class="p">(</span><span class="s1">&#39;table_name&#39;</span><span class="p">);</span>
  460. <span class="k">foreach</span> <span class="p">(</span><span class="nv">$fields</span> <span class="k">as</span> <span class="nv">$field</span><span class="p">)</span>
  461. <span class="p">{</span>
  462. <span class="k">echo</span> <span class="nv">$field</span><span class="o">-&gt;</span><span class="na">name</span><span class="p">;</span>
  463. <span class="k">echo</span> <span class="nv">$field</span><span class="o">-&gt;</span><span class="na">type</span><span class="p">;</span>
  464. <span class="k">echo</span> <span class="nv">$field</span><span class="o">-&gt;</span><span class="na">max_length</span><span class="p">;</span>
  465. <span class="k">echo</span> <span class="nv">$field</span><span class="o">-&gt;</span><span class="na">primary_key</span><span class="p">;</span>
  466. <span class="p">}</span>
  467. </pre></div>
  468. </div>
  469. <p>If you have run a query already you can use the result object instead of
  470. supplying the table name:</p>
  471. <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$query</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">query</span><span class="p">(</span><span class="s2">&quot;YOUR QUERY&quot;</span><span class="p">);</span>
  472. <span class="nv">$fields</span> <span class="o">=</span> <span class="nv">$query</span><span class="o">-&gt;</span><span class="na">field_data</span><span class="p">();</span>
  473. </pre></div>
  474. </div>
  475. <p>The following data is available from this function if supported by your
  476. database:</p>
  477. <ul class="simple">
  478. <li>name - column name</li>
  479. <li>max_length - maximum length of the column</li>
  480. <li>primary_key - 1 if the column is a primary key</li>
  481. <li>type - the type of the column</li>
  482. </ul>
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