? Fallagassrini

Fallagassrini Bypass Shell

echo"
Fallagassrini
";
Current Path : /home1/savoy/www/savoyeducation.com/user_guide/database/

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  <div class="section" id="queries">
<h1>Queries<a class="headerlink" href="#queries" title="Permalink to this headline">¶</a></h1>
<div class="section" id="query-basics">
<h2>Query Basics<a class="headerlink" href="#query-basics" title="Permalink to this headline">¶</a></h2>
<div class="section" id="regular-queries">
<h3>Regular Queries<a class="headerlink" href="#regular-queries" title="Permalink to this headline">¶</a></h3>
<p>To submit a query, use the <strong>query</strong> function:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">query</span><span class="p">(</span><span class="s1">&#39;YOUR QUERY HERE&#39;</span><span class="p">);</span>
</pre></div>
</div>
<p>The query() function returns a database result <strong>object</strong> when &#8220;read&#8221;
type queries are run, which you can use to <a class="reference internal" href="results.html"><em>show your
results</em></a>. When &#8220;write&#8221; type queries are run it simply
returns TRUE or FALSE depending on success or failure. When retrieving
data you will typically assign the query to your own variable, like
this:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$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;YOUR QUERY HERE&#39;</span><span class="p">);</span>
</pre></div>
</div>
</div>
<div class="section" id="simplified-queries">
<h3>Simplified Queries<a class="headerlink" href="#simplified-queries" title="Permalink to this headline">¶</a></h3>
<p>The <strong>simple_query</strong> method is a simplified version of the
$this-&gt;db-&gt;query() method. It DOES
NOT return a database result set, nor does it set the query timer, or
compile bind data, or store your query for debugging. It simply lets you
submit a query. Most users will rarely use this function.</p>
<p>It returns whatever the database drivers&#8217; &#8220;execute&#8221; function returns.
That typically is TRUE/FALSE on success or failure for write type queries
such as INSERT, DELETE or UPDATE statements (which is what it really
should be used for) and a resource/object on success for queries with
fetchable results.</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="k">if</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">simple_query</span><span class="p">(</span><span class="s1">&#39;YOUR QUERY&#39;</span><span class="p">))</span>
<span class="p">{</span>
        <span class="k">echo</span> <span class="s2">&quot;Success!&quot;</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">else</span>
<span class="p">{</span>
        <span class="k">echo</span> <span class="s2">&quot;Query failed!&quot;</span><span class="p">;</span>
<span class="p">}</span>
</pre></div>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">PostgreSQL&#8217;s <tt class="docutils literal"><span class="pre">pg_exec()</span></tt> function (for example) always
returns a resource on success, even for write type queries.
So take that in mind if you&#8217;re looking for a boolean value.</p>
</div>
</div>
</div>
<div class="section" id="working-with-database-prefixes-manually">
<h2>Working with Database prefixes manually<a class="headerlink" href="#working-with-database-prefixes-manually" title="Permalink to this headline">¶</a></h2>
<p>If you have configured a database prefix and would like to prepend it to
a table name for use in a native SQL query for example, then you can use
the following:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">dbprefix</span><span class="p">(</span><span class="s1">&#39;tablename&#39;</span><span class="p">);</span> <span class="c1">// outputs prefix_tablename</span>
</pre></div>
</div>
<p>If for any reason you would like to change the prefix programatically
without needing to create a new connection, you can use this method:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">set_dbprefix</span><span class="p">(</span><span class="s1">&#39;newprefix&#39;</span><span class="p">);</span>
<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">dbprefix</span><span class="p">(</span><span class="s1">&#39;tablename&#39;</span><span class="p">);</span> <span class="c1">// outputs newprefix_tablename</span>
</pre></div>
</div>
</div>
<div class="section" id="protecting-identifiers">
<h2>Protecting identifiers<a class="headerlink" href="#protecting-identifiers" title="Permalink to this headline">¶</a></h2>
<p>In many databases it is advisable to protect table and field names - for
example with backticks in MySQL. <strong>Query Builder queries are
automatically protected</strong>, however if you need to manually protect an
identifier you can use:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">protect_identifiers</span><span class="p">(</span><span class="s1">&#39;table_name&#39;</span><span class="p">);</span>
</pre></div>
</div>
<div class="admonition important">
<p class="first admonition-title">Important</p>
<p class="last">Although the Query Builder will try its best to properly
quote any field and table names that you feed it, note that it
is NOT designed to work with arbitrary user input. DO NOT feed it
with unsanitized user data.</p>
</div>
<p>This function will also add a table prefix to your table, assuming you
have a prefix specified in your database config file. To enable the
prefixing set TRUE (boolean) via the second parameter:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">protect_identifiers</span><span class="p">(</span><span class="s1">&#39;table_name&#39;</span><span class="p">,</span> <span class="k">TRUE</span><span class="p">);</span>
</pre></div>
</div>
</div>
<div class="section" id="escaping-queries">
<h2>Escaping Queries<a class="headerlink" href="#escaping-queries" title="Permalink to this headline">¶</a></h2>
<p>It&#8217;s a very good security practice to escape your data before submitting
it into your database. CodeIgniter has three methods that help you do
this:</p>
<ol class="arabic">
<li><p class="first"><strong>$this-&gt;db-&gt;escape()</strong> This function determines the data type so
that it can escape only string data. It also automatically adds
single quotes around the data so you don&#8217;t have to:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$sql</span> <span class="o">=</span> <span class="s2">&quot;INSERT INTO table (title) VALUES(&quot;</span><span class="o">.</span><span class="nv">$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">$title</span><span class="p">)</span><span class="o">.</span><span class="s2">&quot;)&quot;</span><span class="p">;</span>
</pre></div>
</div>
</li>
<li><p class="first"><strong>$this-&gt;db-&gt;escape_str()</strong> This function escapes the data passed to
it, regardless of type. Most of the time you&#8217;ll use the above
function rather than this one. Use the function like this:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$sql</span> <span class="o">=</span> <span class="s2">&quot;INSERT INTO table (title) VALUES(&#39;&quot;</span><span class="o">.</span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">escape_str</span><span class="p">(</span><span class="nv">$title</span><span class="p">)</span><span class="o">.</span><span class="s2">&quot;&#39;)&quot;</span><span class="p">;</span>
</pre></div>
</div>
</li>
<li><p class="first"><strong>$this-&gt;db-&gt;escape_like_str()</strong> This method should be used when
strings are to be used in LIKE conditions so that LIKE wildcards
(&#8216;%&#8217;, &#8216;_&#8217;) in the string are also properly escaped.</p>
</li>
</ol>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$search</span> <span class="o">=</span> <span class="s1">&#39;20% raise&#39;</span><span class="p">;</span>
<span class="nv">$sql</span> <span class="o">=</span> <span class="s2">&quot;SELECT id FROM table WHERE column LIKE &#39;%&quot;</span> <span class="o">.</span>
    <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">escape_like_str</span><span class="p">(</span><span class="nv">$search</span><span class="p">)</span><span class="o">.</span><span class="s2">&quot;%&#39; ESCAPE &#39;!&#39;&quot;</span><span class="p">;</span>
</pre></div>
</div>
<div class="admonition important">
<p class="first admonition-title">Important</p>
<p class="last">The <tt class="docutils literal"><span class="pre">escape_like_str()</span></tt> method uses &#8216;!&#8217; (exclamation mark)
to escape special characters for <em>LIKE</em> conditions. Because this
method escapes partial strings that you would wrap in quotes
yourself, it cannot automatically add the <tt class="docutils literal"><span class="pre">ESCAPE</span> <span class="pre">'!'</span></tt>
condition for you, and so you&#8217;ll have to manually do that.</p>
</div>
</div>
<div class="section" id="query-bindings">
<h2>Query Bindings<a class="headerlink" href="#query-bindings" title="Permalink to this headline">¶</a></h2>
<p>Bindings enable you to simplify your query syntax by letting the system
put the queries together for you. Consider the following example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$sql</span> <span class="o">=</span> <span class="s2">&quot;SELECT * FROM some_table WHERE id = ? AND status = ? AND author = ?&quot;</span><span class="p">;</span>
<span class="nv">$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">$sql</span><span class="p">,</span> <span class="k">array</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="s1">&#39;live&#39;</span><span class="p">,</span> <span class="s1">&#39;Rick&#39;</span><span class="p">));</span>
</pre></div>
</div>
<p>The question marks in the query are automatically replaced with the
values in the array in the second parameter of the query function.</p>
<p>Binding also work with arrays, which will be transformed to IN sets:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$sql</span> <span class="o">=</span> <span class="s2">&quot;SELECT * FROM some_table WHERE id IN ? AND status = ? AND author = ?&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">array</span><span class="p">(</span><span class="k">array</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="mi">6</span><span class="p">),</span> <span class="s1">&#39;live&#39;</span><span class="p">,</span> <span class="s1">&#39;Rick&#39;</span><span class="p">));</span>
</pre></div>
</div>
<p>The resulting query will be:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nx">SELECT</span> <span class="o">*</span> <span class="nx">FROM</span> <span class="nx">some_table</span> <span class="nx">WHERE</span> <span class="nx">id</span> <span class="nx">IN</span> <span class="p">(</span><span class="mi">3</span><span class="p">,</span><span class="mi">6</span><span class="p">)</span> <span class="k">AND</span> <span class="nx">status</span> <span class="o">=</span> <span class="s1">&#39;live&#39;</span> <span class="k">AND</span> <span class="nx">author</span> <span class="o">=</span> <span class="s1">&#39;Rick&#39;</span>
</pre></div>
</div>
<p>The secondary benefit of using binds is that the values are
automatically escaped, producing safer queries. You don&#8217;t have to
remember to manually escape data; the engine does it automatically for
you.</p>
</div>
<div class="section" id="handling-errors">
<h2>Handling Errors<a class="headerlink" href="#handling-errors" title="Permalink to this headline">¶</a></h2>
<p><strong>$this-&gt;db-&gt;error();</strong></p>
<p>If you need to get the last error that has occured, the error() method
will return an array containing its code and message. Here&#8217;s a quick
example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="k">if</span> <span class="p">(</span> <span class="o">!</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">simple_query</span><span class="p">(</span><span class="s1">&#39;SELECT `example_field` FROM `example_table`&#39;</span><span class="p">))</span>
<span class="p">{</span>
        <span class="nv">$error</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">error</span><span class="p">();</span> <span class="c1">// Has keys &#39;code&#39; and &#39;message&#39;</span>
<span class="p">}</span>
</pre></div>
</div>
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