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  <div class="section" id="database-quick-start-example-code">
<h1>Database Quick Start: Example Code<a class="headerlink" href="#database-quick-start-example-code" title="Permalink to this headline">¶</a></h1>
<p>The following page contains example code showing how the database class
is used. For complete details please read the individual pages
describing each function.</p>
<div class="section" id="initializing-the-database-class">
<h2>Initializing the Database Class<a class="headerlink" href="#initializing-the-database-class" title="Permalink to this headline">¶</a></h2>
<p>The following code loads and initializes the database class based on
your <a class="reference internal" href="configuration.html"><span class="doc">configuration</span></a> settings:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">database</span><span class="p">();</span>
</pre></div>
</div>
<p>Once loaded the class is ready to be used as described below.</p>
<p>Note: If all your pages require database access you can connect
automatically. See the <a class="reference internal" href="connecting.html"><span class="doc">connecting</span></a> page for details.</p>
</div>
<div class="section" id="standard-query-with-multiple-results-object-version">
<h2>Standard Query With Multiple Results (Object Version)<a class="headerlink" href="#standard-query-with-multiple-results-object-version" title="Permalink to this headline">¶</a></h2>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$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 name, title, email FROM my_table&#39;</span><span class="p">);</span>

<span class="k">echo</span> <span class="s1">&#39;Total Results: &#39;</span> <span class="o">.</span> <span class="nv">$query</span><span class="o">-&gt;</span><span class="na">num_rows</span><span class="p">();</span>
</pre></div>
</div>
<p>The above result() function returns an array of <strong>objects</strong>. Example:
$row-&gt;title</p>
</div>
<div class="section" id="standard-query-with-multiple-results-array-version">
<h2>Standard Query With Multiple Results (Array Version)<a class="headerlink" href="#standard-query-with-multiple-results-array-version" title="Permalink to this headline">¶</a></h2>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$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 name, title, email FROM my_table&#39;</span><span class="p">);</span>

<span class="k">foreach</span> <span class="p">(</span><span class="nv">$query</span><span class="o">-&gt;</span><span class="na">result_array</span><span class="p">()</span> <span class="k">as</span> <span class="nv">$row</span><span class="p">)</span>
<span class="p">{</span>
        <span class="k">echo</span> <span class="nv">$row</span><span class="p">[</span><span class="s1">&#39;title&#39;</span><span class="p">];</span>
        <span class="k">echo</span> <span class="nv">$row</span><span class="p">[</span><span class="s1">&#39;name&#39;</span><span class="p">];</span>
        <span class="k">echo</span> <span class="nv">$row</span><span class="p">[</span><span class="s1">&#39;email&#39;</span><span class="p">];</span>
<span class="p">}</span>
</pre></div>
</div>
<p>The above result_array() function returns an array of standard array
indexes. Example: $row[‘title’]</p>
</div>
<div class="section" id="standard-query-with-single-result">
<h2>Standard Query With Single Result<a class="headerlink" href="#standard-query-with-single-result" title="Permalink to this headline">¶</a></h2>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$query</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">query</span><span class="p">(</span><span class="s1">&#39;SELECT name FROM my_table LIMIT 1&#39;</span><span class="p">);</span>
<span class="nv">$row</span> <span class="o">=</span> <span class="nv">$query</span><span class="o">-&gt;</span><span class="na">row</span><span class="p">();</span>
<span class="k">echo</span> <span class="nv">$row</span><span class="o">-&gt;</span><span class="na">name</span><span class="p">;</span>
</pre></div>
</div>
<p>The above row() function returns an <strong>object</strong>. Example: $row-&gt;name</p>
</div>
<div class="section" id="standard-query-with-single-result-array-version">
<h2>Standard Query With Single Result (Array version)<a class="headerlink" href="#standard-query-with-single-result-array-version" title="Permalink to this headline">¶</a></h2>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$query</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">query</span><span class="p">(</span><span class="s1">&#39;SELECT name FROM my_table LIMIT 1&#39;</span><span class="p">);</span>
<span class="nv">$row</span> <span class="o">=</span> <span class="nv">$query</span><span class="o">-&gt;</span><span class="na">row_array</span><span class="p">();</span>
<span class="k">echo</span> <span class="nv">$row</span><span class="p">[</span><span class="s1">&#39;name&#39;</span><span class="p">];</span>
</pre></div>
</div>
<p>The above row_array() function returns an <strong>array</strong>. Example:
$row[‘name’]</p>
</div>
<div class="section" id="standard-insert">
<h2>Standard Insert<a class="headerlink" href="#standard-insert" title="Permalink to this headline">¶</a></h2>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$sql</span> <span class="o">=</span> <span class="s2">&quot;INSERT INTO mytable (title, name) VALUES (&quot;</span><span class="o">.</span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">escape</span><span class="p">(</span><span class="nv">$title</span><span class="p">)</span><span class="o">.</span><span class="s2">&quot;, &quot;</span><span class="o">.</span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">escape</span><span class="p">(</span><span class="nv">$name</span><span class="p">)</span><span class="o">.</span><span class="s2">&quot;)&quot;</span><span class="p">;</span>
<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">query</span><span class="p">(</span><span class="nv">$sql</span><span class="p">);</span>
<span class="k">echo</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">affected_rows</span><span class="p">();</span>
</pre></div>
</div>
</div>
<div class="section" id="query-builder-query">
<h2>Query Builder Query<a class="headerlink" href="#query-builder-query" title="Permalink to this headline">¶</a></h2>
<p>The <a class="reference internal" href="query_builder.html"><span class="doc">Query Builder Pattern</span></a> gives you a simplified
means of retrieving data:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$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">get</span><span class="p">(</span><span class="s1">&#39;table_name&#39;</span><span class="p">);</span>

<span class="k">foreach</span> <span class="p">(</span><span class="nv">$query</span><span class="o">-&gt;</span><span class="na">result</span><span class="p">()</span> <span class="k">as</span> <span class="nv">$row</span><span class="p">)</span>
<span class="p">{</span>
        <span class="k">echo</span> <span class="nv">$row</span><span class="o">-&gt;</span><span class="na">title</span><span class="p">;</span>
<span class="p">}</span>
</pre></div>
</div>
<p>The above get() function retrieves all the results from the supplied
table. The <a class="reference internal" href="query_builder.html"><span class="doc">Query Builder</span></a> class contains a full
compliment of functions for working with data.</p>
</div>
<div class="section" id="query-builder-insert">
<h2>Query Builder Insert<a class="headerlink" href="#query-builder-insert" title="Permalink to this headline">¶</a></h2>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$data</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
        <span class="s1">&#39;title&#39;</span> <span class="o">=&gt;</span> <span class="nv">$title</span><span class="p">,</span>
        <span class="s1">&#39;name&#39;</span> <span class="o">=&gt;</span> <span class="nv">$name</span><span class="p">,</span>
        <span class="s1">&#39;date&#39;</span> <span class="o">=&gt;</span> <span class="nv">$date</span>
<span class="p">);</span>

<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">insert</span><span class="p">(</span><span class="s1">&#39;mytable&#39;</span><span class="p">,</span> <span class="nv">$data</span><span class="p">);</span>  <span class="c1">// Produces: INSERT INTO mytable (title, name, date) VALUES (&#39;{$title}&#39;, &#39;{$name}&#39;, &#39;{$date}&#39;)</span>
</pre></div>
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