helpers.html 42 KB

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  7. <title>Query Helper Methods &mdash; CodeIgniter 3.1.11 documentation</title>
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  69. <li class="toctree-l2"><a class="reference internal" href="../general/models.html">Models</a></li>
  70. <li class="toctree-l2"><a class="reference internal" href="../general/helpers.html">Helpers</a></li>
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  72. <li class="toctree-l2"><a class="reference internal" href="../general/creating_libraries.html">Creating Libraries</a></li>
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  75. <li class="toctree-l2"><a class="reference internal" href="../general/core_classes.html">Creating Core System Classes</a></li>
  76. <li class="toctree-l2"><a class="reference internal" href="../general/ancillary_classes.html">Creating Ancillary Classes</a></li>
  77. <li class="toctree-l2"><a class="reference internal" href="../general/hooks.html">Hooks - Extending the Framework Core</a></li>
  78. <li class="toctree-l2"><a class="reference internal" href="../general/autoloader.html">Auto-loading Resources</a></li>
  79. <li class="toctree-l2"><a class="reference internal" href="../general/common_functions.html">Common Functions</a></li>
  80. <li class="toctree-l2"><a class="reference internal" href="../general/compatibility_functions.html">Compatibility Functions</a></li>
  81. <li class="toctree-l2"><a class="reference internal" href="../general/routing.html">URI Routing</a></li>
  82. <li class="toctree-l2"><a class="reference internal" href="../general/errors.html">Error Handling</a></li>
  83. <li class="toctree-l2"><a class="reference internal" href="../general/caching.html">Caching</a></li>
  84. <li class="toctree-l2"><a class="reference internal" href="../general/profiling.html">Profiling Your Application</a></li>
  85. <li class="toctree-l2"><a class="reference internal" href="../general/cli.html">Running via the CLI</a></li>
  86. <li class="toctree-l2"><a class="reference internal" href="../general/managing_apps.html">Managing your Applications</a></li>
  87. <li class="toctree-l2"><a class="reference internal" href="../general/environments.html">Handling Multiple Environments</a></li>
  88. <li class="toctree-l2"><a class="reference internal" href="../general/alternative_php.html">Alternate PHP Syntax for View Files</a></li>
  89. <li class="toctree-l2"><a class="reference internal" href="../general/security.html">Security</a></li>
  90. <li class="toctree-l2"><a class="reference internal" href="../general/styleguide.html">PHP Style Guide</a></li>
  91. </ul>
  92. </li>
  93. </ul>
  94. <ul>
  95. <li class="toctree-l1"><a class="reference internal" href="../libraries/index.html">Libraries</a><ul>
  96. <li class="toctree-l2"><a class="reference internal" href="../libraries/benchmark.html">Benchmarking Class</a></li>
  97. <li class="toctree-l2"><a class="reference internal" href="../libraries/caching.html">Caching Driver</a></li>
  98. <li class="toctree-l2"><a class="reference internal" href="../libraries/calendar.html">Calendaring Class</a></li>
  99. <li class="toctree-l2"><a class="reference internal" href="../libraries/cart.html">Shopping Cart Class</a></li>
  100. <li class="toctree-l2"><a class="reference internal" href="../libraries/config.html">Config Class</a></li>
  101. <li class="toctree-l2"><a class="reference internal" href="../libraries/email.html">Email Class</a></li>
  102. <li class="toctree-l2"><a class="reference internal" href="../libraries/encrypt.html">Encrypt Class</a></li>
  103. <li class="toctree-l2"><a class="reference internal" href="../libraries/encryption.html">Encryption Library</a></li>
  104. <li class="toctree-l2"><a class="reference internal" href="../libraries/file_uploading.html">File Uploading Class</a></li>
  105. <li class="toctree-l2"><a class="reference internal" href="../libraries/form_validation.html">Form Validation</a></li>
  106. <li class="toctree-l2"><a class="reference internal" href="../libraries/ftp.html">FTP Class</a></li>
  107. <li class="toctree-l2"><a class="reference internal" href="../libraries/image_lib.html">Image Manipulation Class</a></li>
  108. <li class="toctree-l2"><a class="reference internal" href="../libraries/input.html">Input Class</a></li>
  109. <li class="toctree-l2"><a class="reference internal" href="../libraries/javascript.html">Javascript Class</a></li>
  110. <li class="toctree-l2"><a class="reference internal" href="../libraries/language.html">Language Class</a></li>
  111. <li class="toctree-l2"><a class="reference internal" href="../libraries/loader.html">Loader Class</a></li>
  112. <li class="toctree-l2"><a class="reference internal" href="../libraries/migration.html">Migrations Class</a></li>
  113. <li class="toctree-l2"><a class="reference internal" href="../libraries/output.html">Output Class</a></li>
  114. <li class="toctree-l2"><a class="reference internal" href="../libraries/pagination.html">Pagination Class</a></li>
  115. <li class="toctree-l2"><a class="reference internal" href="../libraries/parser.html">Template Parser Class</a></li>
  116. <li class="toctree-l2"><a class="reference internal" href="../libraries/security.html">Security Class</a></li>
  117. <li class="toctree-l2"><a class="reference internal" href="../libraries/sessions.html">Session Library</a></li>
  118. <li class="toctree-l2"><a class="reference internal" href="../libraries/table.html">HTML Table Class</a></li>
  119. <li class="toctree-l2"><a class="reference internal" href="../libraries/trackback.html">Trackback Class</a></li>
  120. <li class="toctree-l2"><a class="reference internal" href="../libraries/typography.html">Typography Class</a></li>
  121. <li class="toctree-l2"><a class="reference internal" href="../libraries/unit_testing.html">Unit Testing Class</a></li>
  122. <li class="toctree-l2"><a class="reference internal" href="../libraries/uri.html">URI Class</a></li>
  123. <li class="toctree-l2"><a class="reference internal" href="../libraries/user_agent.html">User Agent Class</a></li>
  124. <li class="toctree-l2"><a class="reference internal" href="../libraries/xmlrpc.html">XML-RPC and XML-RPC Server Classes</a></li>
  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 current"><a class="current reference internal" href="#">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"><a class="reference internal" href="metadata.html">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>
  147. </ul>
  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>
  152. <li class="toctree-l2"><a class="reference internal" href="../helpers/cookie_helper.html">Cookie Helper</a></li>
  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>
  158. <li class="toctree-l2"><a class="reference internal" href="../helpers/form_helper.html">Form Helper</a></li>
  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>
  172. </li>
  173. </ul>
  174. </div>
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  180. </a>
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  368. <div role="main" class="document">
  369. <div class="section" id="query-helper-methods">
  370. <h1>Query Helper Methods<a class="headerlink" href="#query-helper-methods" title="Permalink to this headline">¶</a></h1>
  371. <div class="section" id="information-from-executing-a-query">
  372. <h2>Information From Executing a Query<a class="headerlink" href="#information-from-executing-a-query" title="Permalink to this headline">¶</a></h2>
  373. <p><strong>$this-&gt;db-&gt;insert_id()</strong></p>
  374. <p>The insert ID number when performing database inserts.</p>
  375. <div class="admonition note">
  376. <p class="first admonition-title">Note</p>
  377. <p class="last">If using the PDO driver with PostgreSQL, or using the Interbase
  378. driver, this function requires a $name parameter, which specifies the
  379. appropriate sequence to check for the insert id.</p>
  380. </div>
  381. <p><strong>$this-&gt;db-&gt;affected_rows()</strong></p>
  382. <p>Displays the number of affected rows, when doing “write” type queries
  383. (insert, update, etc.).</p>
  384. <div class="admonition note">
  385. <p class="first admonition-title">Note</p>
  386. <p class="last">In MySQL “DELETE FROM TABLE” returns 0 affected rows. The database
  387. class has a small hack that allows it to return the correct number of
  388. affected rows. By default this hack is enabled but it can be turned off
  389. in the database driver file.</p>
  390. </div>
  391. <p><strong>$this-&gt;db-&gt;last_query()</strong></p>
  392. <p>Returns the last query that was run (the query string, not the result).
  393. Example:</p>
  394. <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$str</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">last_query</span><span class="p">();</span>
  395. <span class="c1">// Produces: SELECT * FROM sometable....</span>
  396. </pre></div>
  397. </div>
  398. <div class="admonition note">
  399. <p class="first admonition-title">Note</p>
  400. <p class="last">Disabling the <strong>save_queries</strong> setting in your database
  401. configuration will render this function useless.</p>
  402. </div>
  403. </div>
  404. <div class="section" id="information-about-your-database">
  405. <h2>Information About Your Database<a class="headerlink" href="#information-about-your-database" title="Permalink to this headline">¶</a></h2>
  406. <p><strong>$this-&gt;db-&gt;count_all()</strong></p>
  407. <p>Permits you to determine the number of rows in a particular table.
  408. Submit the table name in the first parameter. Example:</p>
  409. <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">echo</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">count_all</span><span class="p">(</span><span class="s1">&#39;my_table&#39;</span><span class="p">);</span>
  410. <span class="c1">// Produces an integer, like 25</span>
  411. </pre></div>
  412. </div>
  413. <p><strong>$this-&gt;db-&gt;platform()</strong></p>
  414. <p>Outputs the database platform you are running (MySQL, MS SQL, Postgres,
  415. etc…):</p>
  416. <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">echo</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">platform</span><span class="p">();</span>
  417. </pre></div>
  418. </div>
  419. <p><strong>$this-&gt;db-&gt;version()</strong></p>
  420. <p>Outputs the database version you are running:</p>
  421. <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">echo</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">version</span><span class="p">();</span>
  422. </pre></div>
  423. </div>
  424. </div>
  425. <div class="section" id="making-your-queries-easier">
  426. <h2>Making Your Queries Easier<a class="headerlink" href="#making-your-queries-easier" title="Permalink to this headline">¶</a></h2>
  427. <p><strong>$this-&gt;db-&gt;insert_string()</strong></p>
  428. <p>This function simplifies the process of writing database inserts. It
  429. returns a correctly formatted SQL insert string. Example:</p>
  430. <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$data</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;name&#39;</span> <span class="o">=&gt;</span> <span class="nv">$name</span><span class="p">,</span> <span class="s1">&#39;email&#39;</span> <span class="o">=&gt;</span> <span class="nv">$email</span><span class="p">,</span> <span class="s1">&#39;url&#39;</span> <span class="o">=&gt;</span> <span class="nv">$url</span><span class="p">);</span>
  431. <span class="nv">$str</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">insert_string</span><span class="p">(</span><span class="s1">&#39;table_name&#39;</span><span class="p">,</span> <span class="nv">$data</span><span class="p">);</span>
  432. </pre></div>
  433. </div>
  434. <p>The first parameter is the table name, the second is an associative
  435. array with the data to be inserted. The above example produces:</p>
  436. <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nx">INSERT</span> <span class="nx">INTO</span> <span class="nx">table_name</span> <span class="p">(</span><span class="nx">name</span><span class="p">,</span> <span class="nx">email</span><span class="p">,</span> <span class="nx">url</span><span class="p">)</span> <span class="nx">VALUES</span> <span class="p">(</span><span class="s1">&#39;Rick&#39;</span><span class="p">,</span> <span class="s1">&#39;rick@example.com&#39;</span><span class="p">,</span> <span class="s1">&#39;example.com&#39;</span><span class="p">)</span>
  437. </pre></div>
  438. </div>
  439. <div class="admonition note">
  440. <p class="first admonition-title">Note</p>
  441. <p class="last">Values are automatically escaped, producing safer queries.</p>
  442. </div>
  443. <p><strong>$this-&gt;db-&gt;update_string()</strong></p>
  444. <p>This function simplifies the process of writing database updates. It
  445. returns a correctly formatted SQL update string. Example:</p>
  446. <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$data</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;name&#39;</span> <span class="o">=&gt;</span> <span class="nv">$name</span><span class="p">,</span> <span class="s1">&#39;email&#39;</span> <span class="o">=&gt;</span> <span class="nv">$email</span><span class="p">,</span> <span class="s1">&#39;url&#39;</span> <span class="o">=&gt;</span> <span class="nv">$url</span><span class="p">);</span>
  447. <span class="nv">$where</span> <span class="o">=</span> <span class="s2">&quot;author_id = 1 AND status = &#39;active&#39;&quot;</span><span class="p">;</span>
  448. <span class="nv">$str</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">update_string</span><span class="p">(</span><span class="s1">&#39;table_name&#39;</span><span class="p">,</span> <span class="nv">$data</span><span class="p">,</span> <span class="nv">$where</span><span class="p">);</span>
  449. </pre></div>
  450. </div>
  451. <p>The first parameter is the table name, the second is an associative
  452. array with the data to be updated, and the third parameter is the
  453. “where” clause. The above example produces:</p>
  454. <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nx">UPDATE</span> <span class="nx">table_name</span> <span class="nx">SET</span> <span class="nx">name</span> <span class="o">=</span> <span class="s1">&#39;Rick&#39;</span><span class="p">,</span> <span class="nx">email</span> <span class="o">=</span> <span class="s1">&#39;rick@example.com&#39;</span><span class="p">,</span> <span class="nx">url</span> <span class="o">=</span> <span class="s1">&#39;example.com&#39;</span> <span class="nx">WHERE</span> <span class="nx">author_id</span> <span class="o">=</span> <span class="mi">1</span> <span class="k">AND</span> <span class="nx">status</span> <span class="o">=</span> <span class="s1">&#39;active&#39;</span>
  455. </pre></div>
  456. </div>
  457. <div class="admonition note">
  458. <p class="first admonition-title">Note</p>
  459. <p class="last">Values are automatically escaped, producing safer queries.</p>
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