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| author | Andrey Andreev <narf@devilix.net> | 2018-01-13 12:57:11 +0100 |
|---|---|---|
| committer | Andrey Andreev <narf@devilix.net> | 2018-01-13 12:57:11 +0100 |
| commit | 02a0518e1c56ba3506f370362ac5ebdb8a138312 (patch) | |
| tree | 8b4684192b403dcae17d298eb4fc9e7ab001acad /user_guide/database/helpers.html | |
| parent | f0b9735d5857e6c07c8f5824b13cff4828db3cfe (diff) | |
[ci skip] 3.1.7 release
Diffstat (limited to 'user_guide/database/helpers.html')
| -rw-r--r-- | user_guide/database/helpers.html | 592 |
1 files changed, 592 insertions, 0 deletions
diff --git a/user_guide/database/helpers.html b/user_guide/database/helpers.html new file mode 100644 index 000000000..086653756 --- /dev/null +++ b/user_guide/database/helpers.html @@ -0,0 +1,592 @@ + + +<!DOCTYPE html> +<!--[if IE 8]><html class="no-js lt-ie9" lang="en" > <![endif]--> +<!--[if gt IE 8]><!--> <html class="no-js" lang="en" > <!--<![endif]--> +<head> + <meta charset="utf-8"> + <meta name="viewport" content="width=device-width, initial-scale=1.0"> + + <title>Query Helper Methods — CodeIgniter 3.1.7 documentation</title> + + + + + <link rel="shortcut icon" href="../_static/ci-icon.ico"/> + + + + <link href='https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic|Roboto+Slab:400,700|Inconsolata:400,700&subset=latin,cyrillic' rel='stylesheet' type='text/css'> + + + + + + + + + + <link rel="stylesheet" href="../_static/css/citheme.css" type="text/css" /> + + + + <link rel="index" title="Index" + href="../genindex.html"/> + <link rel="search" title="Search" 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+<li class="toctree-l2"><a class="reference internal" href="../helpers/typography_helper.html">Typography Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/url_helper.html">URL Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/xml_helper.html">XML Helper</a></li> +</ul> +</li> +</ul> + + + + </div> + + </nav> + + <section data-toggle="wy-nav-shift" class="wy-nav-content-wrap"> + + + <nav class="wy-nav-top" role="navigation" aria-label="top navigation"> + <i data-toggle="wy-nav-top" class="fa fa-bars"></i> + <a href="../index.html">CodeIgniter</a> + </nav> + + + + <div class="wy-nav-content"> + <div class="rst-content"> + <div role="navigation" aria-label="breadcrumbs navigation"> + <ul class="wy-breadcrumbs"> + <li><a href="../index.html">Docs</a> »</li> + + <li><a href="index.html">Database Reference</a> »</li> + + <li>Query Helper Methods</li> + <li class="wy-breadcrumbs-aside"> + + </li> + <div style="float:right;margin-left:5px;" id="closeMe"> + <img title="Classic Layout" alt="classic layout" src="data:image/gif;base64,R0lGODlhFAAUAJEAAAAAADMzM////wAAACH5BAUUAAIALAAAAAAUABQAAAImlI+py+0PU5gRBRDM3DxbWoXis42X13USOLauUIqnlsaH/eY6UwAAOw==" /> + </div> + </ul> + <hr/> +</div> + <div role="main" class="document"> + + <div class="section" id="query-helper-methods"> +<h1>Query Helper Methods<a class="headerlink" href="#query-helper-methods" title="Permalink to this headline">¶</a></h1> +<div class="section" id="information-from-executing-a-query"> +<h2>Information From Executing a Query<a class="headerlink" href="#information-from-executing-a-query" title="Permalink to this headline">¶</a></h2> +<p><strong>$this->db->insert_id()</strong></p> +<p>The insert ID number when performing database inserts.</p> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">If using the PDO driver with PostgreSQL, or using the Interbase +driver, this function requires a $name parameter, which specifies the +appropriate sequence to check for the insert id.</p> +</div> +<p><strong>$this->db->affected_rows()</strong></p> +<p>Displays the number of affected rows, when doing “write” type queries +(insert, update, etc.).</p> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">In MySQL “DELETE FROM TABLE” returns 0 affected rows. The database +class has a small hack that allows it to return the correct number of +affected rows. By default this hack is enabled but it can be turned off +in the database driver file.</p> +</div> +<p><strong>$this->db->last_query()</strong></p> +<p>Returns the last query that was run (the query string, not the result). +Example:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$str</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">last_query</span><span class="p">();</span> + +<span class="c1">// Produces: SELECT * FROM sometable....</span> +</pre></div> +</div> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">Disabling the <strong>save_queries</strong> setting in your database +configuration will render this function useless.</p> +</div> +</div> +<div class="section" id="information-about-your-database"> +<h2>Information About Your Database<a class="headerlink" href="#information-about-your-database" title="Permalink to this headline">¶</a></h2> +<p><strong>$this->db->count_all()</strong></p> +<p>Permits you to determine the number of rows in a particular table. +Submit the table name in the first parameter. Example:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">echo</span> <span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">count_all</span><span class="p">(</span><span class="s1">'my_table'</span><span class="p">);</span> + +<span class="c1">// Produces an integer, like 25</span> +</pre></div> +</div> +<p><strong>$this->db->platform()</strong></p> +<p>Outputs the database platform you are running (MySQL, MS SQL, Postgres, +etc…):</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">echo</span> <span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">platform</span><span class="p">();</span> +</pre></div> +</div> +<p><strong>$this->db->version()</strong></p> +<p>Outputs the database version you are running:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">echo</span> <span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">version</span><span class="p">();</span> +</pre></div> +</div> +</div> +<div class="section" id="making-your-queries-easier"> +<h2>Making Your Queries Easier<a class="headerlink" href="#making-your-queries-easier" title="Permalink to this headline">¶</a></h2> +<p><strong>$this->db->insert_string()</strong></p> +<p>This function simplifies the process of writing database inserts. It +returns a correctly formatted SQL insert string. Example:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$data</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">'name'</span> <span class="o">=></span> <span class="nv">$name</span><span class="p">,</span> <span class="s1">'email'</span> <span class="o">=></span> <span class="nv">$email</span><span class="p">,</span> <span class="s1">'url'</span> <span class="o">=></span> <span class="nv">$url</span><span class="p">);</span> + +<span class="nv">$str</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">insert_string</span><span class="p">(</span><span class="s1">'table_name'</span><span class="p">,</span> <span class="nv">$data</span><span class="p">);</span> +</pre></div> +</div> +<p>The first parameter is the table name, the second is an associative +array with the data to be inserted. The above example produces:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nx">INSERT</span> <span class="nx">INTO</span> <span class="nx">table_name</span> <span class="p">(</span><span class="nx">name</span><span class="p">,</span> <span class="nx">email</span><span class="p">,</span> <span class="nx">url</span><span class="p">)</span> <span class="nx">VALUES</span> <span class="p">(</span><span class="s1">'Rick'</span><span class="p">,</span> <span class="s1">'rick@example.com'</span><span class="p">,</span> <span class="s1">'example.com'</span><span class="p">)</span> +</pre></div> +</div> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">Values are automatically escaped, producing safer queries.</p> +</div> +<p><strong>$this->db->update_string()</strong></p> +<p>This function simplifies the process of writing database updates. It +returns a correctly formatted SQL update string. Example:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$data</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">'name'</span> <span class="o">=></span> <span class="nv">$name</span><span class="p">,</span> <span class="s1">'email'</span> <span class="o">=></span> <span class="nv">$email</span><span class="p">,</span> <span class="s1">'url'</span> <span class="o">=></span> <span class="nv">$url</span><span class="p">);</span> + +<span class="nv">$where</span> <span class="o">=</span> <span class="s2">"author_id = 1 AND status = 'active'"</span><span class="p">;</span> + +<span class="nv">$str</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">update_string</span><span class="p">(</span><span class="s1">'table_name'</span><span class="p">,</span> <span class="nv">$data</span><span class="p">,</span> <span class="nv">$where</span><span class="p">);</span> +</pre></div> +</div> +<p>The first parameter is the table name, the second is an associative +array with the data to be updated, and the third parameter is the +“where” clause. The above example produces:</p> +<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">'Rick'</span><span class="p">,</span> <span class="nx">email</span> <span class="o">=</span> <span class="s1">'rick@example.com'</span><span class="p">,</span> <span class="nx">url</span> <span class="o">=</span> <span class="s1">'example.com'</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">'active'</span> +</pre></div> +</div> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">Values are automatically escaped, producing safer queries.</p> +</div> +</div> +</div> + + + </div> + <footer> + + <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> + + <a href="query_builder.html" class="btn btn-neutral float-right" title="Query Builder Class">Next <span class="fa fa-arrow-circle-right"></span></a> + + + <a href="results.html" class="btn btn-neutral" title="Generating Query Results"><span class="fa fa-arrow-circle-left"></span> Previous</a> + + </div> + + + <hr/> + + <div role="contentinfo"> + <p> + © Copyright 2014 - 2018, British Columbia Institute of Technology. + Last updated on Jan 13, 2018. + </p> + </div> + + Built with <a href="http://sphinx-doc.org/">Sphinx</a> using a <a href="https://github.com/snide/sphinx_rtd_theme">theme</a> provided by <a href="https://readthedocs.org">Read the Docs</a>. + +</footer> + </div> + </div> + + </section> + + </div> + + + + + + <script type="text/javascript"> + var DOCUMENTATION_OPTIONS = { + URL_ROOT:'../', + VERSION:'3.1.7', + COLLAPSE_INDEX:false, + FILE_SUFFIX:'.html', + HAS_SOURCE: false + }; + </script> + <script type="text/javascript" src="../_static/jquery.js"></script> + <script type="text/javascript" src="../_static/underscore.js"></script> + <script type="text/javascript" src="../_static/doctools.js"></script> + + + + + + <script type="text/javascript" src="../_static/js/theme.js"></script> + + + + + <script type="text/javascript"> + jQuery(function () { + SphinxRtdTheme.StickyNav.enable(); + }); + </script> + + +</body> +</html>
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