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| author | Andrey Andreev <narf@devilix.net> | 2019-01-16 16:49:35 +0100 |
|---|---|---|
| committer | Andrey Andreev <narf@devilix.net> | 2019-01-16 16:49:35 +0100 |
| commit | c576995304fc3609cca0b7b92d1b2cd611ec82f5 (patch) | |
| tree | c8b9121cb295b56bbabe3aeaad0a3eb1f2d390bb /user_guide/database/metadata.html | |
| parent | 4eaf80a6ec0b58a0adc95638153363e00ebf5378 (diff) | |
[ci skip] 3.1.10 release
Diffstat (limited to 'user_guide/database/metadata.html')
| -rw-r--r-- | user_guide/database/metadata.html | 614 |
1 files changed, 614 insertions, 0 deletions
diff --git a/user_guide/database/metadata.html b/user_guide/database/metadata.html new file mode 100644 index 000000000..6dc2e0623 --- /dev/null +++ b/user_guide/database/metadata.html @@ -0,0 +1,614 @@ + + +<!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>Database Metadata — CodeIgniter 3.1.10 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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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="database-metadata"> +<h1>Database Metadata<a class="headerlink" href="#database-metadata" title="Permalink to this headline">¶</a></h1> +<div class="section" id="table-metadata"> +<h2>Table MetaData<a class="headerlink" href="#table-metadata" title="Permalink to this headline">¶</a></h2> +<p>These functions let you fetch table information.</p> +<div class="section" id="list-the-tables-in-your-database"> +<h3>List the Tables in Your Database<a class="headerlink" href="#list-the-tables-in-your-database" title="Permalink to this headline">¶</a></h3> +<p><strong>$this->db->list_tables();</strong></p> +<p>Returns an array containing the names of all the tables in the database +you are currently connected to. Example:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$tables</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">list_tables</span><span class="p">();</span> + +<span class="k">foreach</span> <span class="p">(</span><span class="nv">$tables</span> <span class="k">as</span> <span class="nv">$table</span><span class="p">)</span> +<span class="p">{</span> + <span class="k">echo</span> <span class="nv">$table</span><span class="p">;</span> +<span class="p">}</span> +</pre></div> +</div> +</div> +<div class="section" id="determine-if-a-table-exists"> +<h3>Determine If a Table Exists<a class="headerlink" href="#determine-if-a-table-exists" title="Permalink to this headline">¶</a></h3> +<p><strong>$this->db->table_exists();</strong></p> +<p>Sometimes it’s helpful to know whether a particular table exists before +running an operation on it. Returns a boolean TRUE/FALSE. Usage example:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">table_exists</span><span class="p">(</span><span class="s1">'table_name'</span><span class="p">))</span> +<span class="p">{</span> + <span class="c1">// some code...</span> +<span class="p">}</span> +</pre></div> +</div> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">Replace <em>table_name</em> with the name of the table you are looking for.</p> +</div> +</div> +</div> +<div class="section" id="field-metadata"> +<h2>Field MetaData<a class="headerlink" href="#field-metadata" title="Permalink to this headline">¶</a></h2> +<div class="section" id="list-the-fields-in-a-table"> +<h3>List the Fields in a Table<a class="headerlink" href="#list-the-fields-in-a-table" title="Permalink to this headline">¶</a></h3> +<p><strong>$this->db->list_fields()</strong></p> +<p>Returns an array containing the field names. This query can be called +two ways:</p> +<p>1. You can supply the table name and call it from the $this->db-> +object:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$fields</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">list_fields</span><span class="p">(</span><span class="s1">'table_name'</span><span class="p">);</span> + +<span class="k">foreach</span> <span class="p">(</span><span class="nv">$fields</span> <span class="k">as</span> <span class="nv">$field</span><span class="p">)</span> +<span class="p">{</span> + <span class="k">echo</span> <span class="nv">$field</span><span class="p">;</span> +<span class="p">}</span> +</pre></div> +</div> +<p>2. You can gather the field names associated with any query you run by +calling the function from your query result object:</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">'SELECT * FROM some_table'</span><span class="p">);</span> + +<span class="k">foreach</span> <span class="p">(</span><span class="nv">$query</span><span class="o">-></span><span class="na">list_fields</span><span class="p">()</span> <span class="k">as</span> <span class="nv">$field</span><span class="p">)</span> +<span class="p">{</span> + <span class="k">echo</span> <span class="nv">$field</span><span class="p">;</span> +<span class="p">}</span> +</pre></div> +</div> +</div> +<div class="section" id="determine-if-a-field-is-present-in-a-table"> +<h3>Determine If a Field is Present in a Table<a class="headerlink" href="#determine-if-a-field-is-present-in-a-table" title="Permalink to this headline">¶</a></h3> +<p><strong>$this->db->field_exists()</strong></p> +<p>Sometimes it’s helpful to know whether a particular field exists before +performing an action. Returns a boolean TRUE/FALSE. Usage example:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">field_exists</span><span class="p">(</span><span class="s1">'field_name'</span><span class="p">,</span> <span class="s1">'table_name'</span><span class="p">))</span> +<span class="p">{</span> + <span class="c1">// some code...</span> +<span class="p">}</span> +</pre></div> +</div> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">Replace <em>field_name</em> with the name of the column you are looking +for, and replace <em>table_name</em> with the name of the table you are +looking for.</p> +</div> +</div> +<div class="section" id="retrieve-field-metadata"> +<h3>Retrieve Field Metadata<a class="headerlink" href="#retrieve-field-metadata" title="Permalink to this headline">¶</a></h3> +<p><strong>$this->db->field_data()</strong></p> +<p>Returns an array of objects containing field information.</p> +<p>Sometimes it’s helpful to gather the field names or other metadata, like +the column type, max length, etc.</p> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">Not all databases provide meta-data.</p> +</div> +<p>Usage example:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$fields</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">field_data</span><span class="p">(</span><span class="s1">'table_name'</span><span class="p">);</span> + +<span class="k">foreach</span> <span class="p">(</span><span class="nv">$fields</span> <span class="k">as</span> <span class="nv">$field</span><span class="p">)</span> +<span class="p">{</span> + <span class="k">echo</span> <span class="nv">$field</span><span class="o">-></span><span class="na">name</span><span class="p">;</span> + <span class="k">echo</span> <span class="nv">$field</span><span class="o">-></span><span class="na">type</span><span class="p">;</span> + <span class="k">echo</span> <span class="nv">$field</span><span class="o">-></span><span class="na">max_length</span><span class="p">;</span> + <span class="k">echo</span> <span class="nv">$field</span><span class="o">-></span><span class="na">primary_key</span><span class="p">;</span> +<span class="p">}</span> +</pre></div> +</div> +<p>If you have run a query already you can use the result object instead of +supplying the table name:</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="s2">"YOUR QUERY"</span><span class="p">);</span> +<span class="nv">$fields</span> <span class="o">=</span> <span class="nv">$query</span><span class="o">-></span><span class="na">field_data</span><span class="p">();</span> +</pre></div> +</div> +<p>The following data is available from this function if supported by your +database:</p> +<ul class="simple"> +<li>name - column name</li> +<li>max_length - maximum length of the column</li> +<li>primary_key - 1 if the column is a primary key</li> +<li>type - the type of the column</li> +</ul> +</div> +</div> +</div> + + + </div> + <footer> + + <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> + + <a href="call_function.html" class="btn btn-neutral float-right" title="Custom Function Calls">Next <span class="fa fa-arrow-circle-right"></span></a> + + + <a href="transactions.html" class="btn btn-neutral" title="Transactions"><span class="fa fa-arrow-circle-left"></span> Previous</a> + + </div> + + + <hr/> + + <div role="contentinfo"> + <p> + © Copyright 2014 - 2019, British Columbia Institute of Technology. + Last updated on Jan 16, 2019. + </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:'3.1.10', + 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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