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| author | Andrey Andreev <narf@devilix.net> | 2018-03-22 15:48:55 +0100 |
|---|---|---|
| committer | Andrey Andreev <narf@devilix.net> | 2018-03-22 15:48:55 +0100 |
| commit | 71e647782764184e3aab4faffe6d99176758979f (patch) | |
| tree | 74dbdd50a61cd5674915c144aca9ebbc00b235b8 /user_guide/database/queries.html | |
| parent | b12fbad77bd69ca0c7624a9094c29b7691ea6107 (diff) | |
[ci skip] 3.1.8 release
Diffstat (limited to 'user_guide/database/queries.html')
| -rw-r--r-- | user_guide/database/queries.html | 658 |
1 files changed, 658 insertions, 0 deletions
diff --git a/user_guide/database/queries.html b/user_guide/database/queries.html new file mode 100644 index 000000000..73e642979 --- /dev/null +++ b/user_guide/database/queries.html @@ -0,0 +1,658 @@ + + +<!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>Queries — CodeIgniter 3.1.8 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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href="query_builder.html">Query Builder Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="transactions.html">Transactions</a></li> +<li class="toctree-l2"><a class="reference internal" href="metadata.html">Getting MetaData</a></li> +<li class="toctree-l2"><a class="reference internal" href="call_function.html">Custom Function Calls</a></li> +<li class="toctree-l2"><a class="reference internal" href="caching.html">Query Caching</a></li> +<li class="toctree-l2"><a class="reference internal" href="forge.html">Database Manipulation with Database Forge</a></li> +<li class="toctree-l2"><a class="reference internal" href="utilities.html">Database Utilities Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="db_driver_reference.html">Database Driver Reference</a></li> +</ul> +</li> +</ul> +<ul> +<li class="toctree-l1"><a class="reference internal" href="../helpers/index.html">Helpers</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../helpers/array_helper.html">Array Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/captcha_helper.html">CAPTCHA Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/cookie_helper.html">Cookie Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/date_helper.html">Date Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/directory_helper.html">Directory Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/download_helper.html">Download Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/email_helper.html">Email Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/file_helper.html">File Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/form_helper.html">Form Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/html_helper.html">HTML Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/inflector_helper.html">Inflector Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/language_helper.html">Language Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/number_helper.html">Number Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/path_helper.html">Path Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/security_helper.html">Security Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/smiley_helper.html">Smiley Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/string_helper.html">String Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/text_helper.html">Text Helper</a></li> +<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>Queries</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="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></span><span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">query</span><span class="p">(</span><span class="s1">'YOUR QUERY HERE'</span><span class="p">);</span> +</pre></div> +</div> +<p>The query() function returns a database result <strong>object</strong> when “read” +type queries are run, which you can use to <a class="reference internal" href="results.html"><span class="doc">show your +results</span></a>. When “write” type queries are run it simply +returns TRUE or FALSE depending on success or failure. When retrieving +data you will typically assign the query to your own variable, like +this:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$query</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">query</span><span class="p">(</span><span class="s1">'YOUR QUERY HERE'</span><span class="p">);</span> +</pre></div> +</div> +</div> +<div class="section" id="simplified-queries"> +<h3>Simplified Queries<a class="headerlink" href="#simplified-queries" title="Permalink to this headline">¶</a></h3> +<p>The <strong>simple_query</strong> method is a simplified version of the +$this->db->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’ “execute” 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></span><span class="k">if</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">simple_query</span><span class="p">(</span><span class="s1">'YOUR QUERY'</span><span class="p">))</span> +<span class="p">{</span> + <span class="k">echo</span> <span class="s2">"Success!"</span><span class="p">;</span> +<span class="p">}</span> +<span class="k">else</span> +<span class="p">{</span> + <span class="k">echo</span> <span class="s2">"Query failed!"</span><span class="p">;</span> +<span class="p">}</span> +</pre></div> +</div> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">PostgreSQL’s <code class="docutils literal"><span class="pre">pg_exec()</span></code> function (for example) always +returns a resource on success, even for write type queries. +So take that in mind if you’re looking for a boolean value.</p> +</div> +</div> +</div> +<div class="section" id="working-with-database-prefixes-manually"> +<h2>Working with Database prefixes manually<a class="headerlink" href="#working-with-database-prefixes-manually" title="Permalink to this headline">¶</a></h2> +<p>If you have configured a database prefix and would like to prepend it to +a table name for use in a native SQL query for example, then you can use +the following:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">dbprefix</span><span class="p">(</span><span class="s1">'tablename'</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></span><span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">set_dbprefix</span><span class="p">(</span><span class="s1">'newprefix_'</span><span class="p">);</span> +<span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">dbprefix</span><span class="p">(</span><span class="s1">'tablename'</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></span><span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">protect_identifiers</span><span class="p">(</span><span class="s1">'table_name'</span><span class="p">);</span> +</pre></div> +</div> +<div class="admonition important"> +<p class="first admonition-title">Important</p> +<p class="last">Although the Query Builder will try its best to properly +quote any field and table names that you feed it, note that it +is NOT designed to work with arbitrary user input. DO NOT feed it +with unsanitized user data.</p> +</div> +<p>This function will also add a table prefix to your table, assuming you +have a prefix specified in your database config file. To enable the +prefixing set TRUE (boolean) via the second parameter:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">protect_identifiers</span><span class="p">(</span><span class="s1">'table_name'</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’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>$this->db->escape()</strong> This function determines the data type so +that it can escape only string data. It also automatically adds +single quotes around the data so you don’t have to:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$sql</span> <span class="o">=</span> <span class="s2">"INSERT INTO table (title) VALUES("</span><span class="o">.</span><span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">escape</span><span class="p">(</span><span class="nv">$title</span><span class="p">)</span><span class="o">.</span><span class="s2">")"</span><span class="p">;</span> +</pre></div> +</div> +</li> +<li><p class="first"><strong>$this->db->escape_str()</strong> This function escapes the data passed to +it, regardless of type. Most of the time you’ll use the above +function rather than this one. Use the function like this:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$sql</span> <span class="o">=</span> <span class="s2">"INSERT INTO table (title) VALUES('"</span><span class="o">.</span><span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">escape_str</span><span class="p">(</span><span class="nv">$title</span><span class="p">)</span><span class="o">.</span><span class="s2">"')"</span><span class="p">;</span> +</pre></div> +</div> +</li> +<li><p class="first"><strong>$this->db->escape_like_str()</strong> This method should be used when +strings are to be used in LIKE conditions so that LIKE wildcards +(‘%’, ‘_’) in the string are also properly escaped.</p> +</li> +</ol> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$search</span> <span class="o">=</span> <span class="s1">'20% raise'</span><span class="p">;</span> +<span class="nv">$sql</span> <span class="o">=</span> <span class="s2">"SELECT id FROM table WHERE column LIKE '%"</span> <span class="o">.</span> + <span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">escape_like_str</span><span class="p">(</span><span class="nv">$search</span><span class="p">)</span><span class="o">.</span><span class="s2">"%' ESCAPE '!'"</span><span class="p">;</span> +</pre></div> +</div> +<div class="admonition important"> +<p class="first admonition-title">Important</p> +<p class="last">The <code class="docutils literal"><span class="pre">escape_like_str()</span></code> method uses ‘!’ (exclamation mark) +to escape special characters for <em>LIKE</em> conditions. Because this +method escapes partial strings that you would wrap in quotes +yourself, it cannot automatically add the <code class="docutils literal"><span class="pre">ESCAPE</span> <span class="pre">'!'</span></code> +condition for you, and so you’ll have to manually do that.</p> +</div> +</div> +<div class="section" id="query-bindings"> +<h2>Query Bindings<a class="headerlink" href="#query-bindings" title="Permalink to this headline">¶</a></h2> +<p>Bindings enable you to simplify your query syntax by letting the system +put the queries together for you. Consider the following example:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$sql</span> <span class="o">=</span> <span class="s2">"SELECT * FROM some_table WHERE id = ? AND status = ? AND author = ?"</span><span class="p">;</span> +<span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">query</span><span class="p">(</span><span class="nv">$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">'live'</span><span class="p">,</span> <span class="s1">'Rick'</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></span><span class="nv">$sql</span> <span class="o">=</span> <span class="s2">"SELECT * FROM some_table WHERE id IN ? AND status = ? AND author = ?"</span><span class="p">;</span> +<span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">query</span><span class="p">(</span><span class="nv">$sql</span><span class="p">,</span> <span class="k">array</span><span class="p">(</span><span class="k">array</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="mi">6</span><span class="p">),</span> <span class="s1">'live'</span><span class="p">,</span> <span class="s1">'Rick'</span><span class="p">));</span> +</pre></div> +</div> +<p>The resulting query will be:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nx">SELECT</span> <span class="o">*</span> <span class="nx">FROM</span> <span class="nx">some_table</span> <span class="nx">WHERE</span> <span class="nx">id</span> <span class="nx">IN</span> <span class="p">(</span><span class="mi">3</span><span class="p">,</span><span class="mi">6</span><span class="p">)</span> <span class="k">AND</span> <span class="nx">status</span> <span class="o">=</span> <span class="s1">'live'</span> <span class="k">AND</span> <span class="nx">author</span> <span class="o">=</span> <span class="s1">'Rick'</span> +</pre></div> +</div> +<p>The secondary benefit of using binds is that the values are +automatically escaped, producing safer queries. You don’t have to +remember to manually escape data; the engine does it automatically for +you.</p> +</div> +<div class="section" id="handling-errors"> +<h2>Handling Errors<a class="headerlink" href="#handling-errors" title="Permalink to this headline">¶</a></h2> +<p><strong>$this->db->error();</strong></p> +<p>If you need to get the last error that has occurred, the error() method +will return an array containing its code and message. Here’s a quick +example:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="p">(</span> <span class="o">!</span> <span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">simple_query</span><span class="p">(</span><span class="s1">'SELECT `example_field` FROM `example_table`'</span><span class="p">))</span> +<span class="p">{</span> + <span class="nv">$error</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">error</span><span class="p">();</span> <span class="c1">// Has keys 'code' and 'message'</span> +<span class="p">}</span> +</pre></div> +</div> +</div> +</div> + + + </div> + <footer> + + <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> + + <a href="results.html" class="btn btn-neutral float-right" title="Generating Query Results">Next <span class="fa fa-arrow-circle-right"></span></a> + + + <a href="connecting.html" class="btn btn-neutral" title="Connecting to your Database"><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 Mar 22, 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:'3.1.8', + 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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