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  <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-&gt;db-&gt;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-&gt;db-&gt;affected_rows()</strong></p>
<p>Displays the number of affected rows, when doing &#8220;write&#8221; type queries
(insert, update, etc.).</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">In MySQL &#8220;DELETE FROM TABLE&#8221; 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>$this-&gt;db-&gt;last_query()</strong></p>
<p>Returns the last query that was run (the query string, not the result).
Example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$str</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</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>$this-&gt;db-&gt;count_all()</strong></p>
<p>Permits you to determine the number of rows in a particular table.
Submit the table name in the first parameter. Example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">echo</span> <span class="nv">$this</span><span class="o">-&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>

<span class="c1">// Produces an integer, like 25</span>
</pre></div>
</div>
<p><strong>$this-&gt;db-&gt;platform()</strong></p>
<p>Outputs the database platform you are running (MySQL, MS SQL, Postgres,
etc...):</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">echo</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">platform</span><span class="p">();</span>
</pre></div>
</div>
<p><strong>$this-&gt;db-&gt;version()</strong></p>
<p>Outputs the database version you are running:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">echo</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</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>$this-&gt;db-&gt;insert_string()</strong></p>
<p>This function simplifies the process of writing database inserts. It
returns a correctly formatted SQL insert string. Example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$data</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#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>

<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">$data</span><span class="p">);</span>
</pre></div>
</div>
<p>The first parameter is the table name, the second is an associative
array with the data to be inserted. The above example produces:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nx">INSERT</span> <span class="nx">INTO</span> <span class="nx">table_name</span> <span class="p">(</span><span class="nx">name</span><span class="p">,</span> <span class="nx">email</span><span class="p">,</span> <span class="nx">url</span><span class="p">)</span> <span class="nx">VALUES</span> <span class="p">(</span><span class="s1">&#39;Rick&#39;</span><span class="p">,</span> <span class="s1">&#39;rick@example.com&#39;</span><span class="p">,</span> <span class="s1">&#39;example.com&#39;</span><span class="p">)</span>
</pre></div>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">Values are automatically escaped, producing safer queries.</p>
</div>
<p><strong>$this-&gt;db-&gt;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">$data</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;name&#39;</span> <span class="o">=&gt;</span> <span class="nv">$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>

<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>

<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>
</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
&#8220;where&#8221; 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">&#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>
</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>

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