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251 lines
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251 lines
15 KiB
2 years ago
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<!DOCTYPE html>
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<html>
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<meta charset="utf-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<title>Transformations — phpMyAdmin 5.2.0 documentation</title>
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accesskey="I">index</a></li>
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<li class="nav-item nav-item-0"><a href="index.html">phpMyAdmin 5.2.0 documentation</a> »</li>
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<li class="nav-item nav-item-1"><a href="user.html" accesskey="U">User Guide</a> »</li>
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<li class="nav-item nav-item-this"><a href="">Transformations</a></li>
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</ul>
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<div class="document">
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<div class="body" role="main">
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<div class="section" id="transformations">
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<span id="id1"></span><h1>Transformations<a class="headerlink" href="#transformations" title="Permalink to this headline">¶</a></h1>
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<div class="admonition note">
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<p class="admonition-title">Note</p>
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<p>You need to have configured the <a class="reference internal" href="setup.html#linked-tables"><span class="std std-ref">phpMyAdmin configuration storage</span></a> to use the transformations
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feature.</p>
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</div>
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<div class="section" id="introduction">
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<span id="transformationsintro"></span><h2>Introduction<a class="headerlink" href="#introduction" title="Permalink to this headline">¶</a></h2>
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<p>To enable transformations, you have to set up the <code class="docutils literal notranslate"><span class="pre">column_info</span></code>
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table and the proper directives. Please see the <a class="reference internal" href="config.html#config"><span class="std std-ref">Configuration</span></a> on how to do so.</p>
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<p>phpMyAdmin has two different types of transformations: browser display
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transformations, which affect only how the data is shown when browsing
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through phpMyAdmin; and input transformations, which affect a value
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prior to being inserted through phpMyAdmin.
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You can apply different transformations to the contents of each
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column. Each transformation has options to define how it will affect the
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stored data.</p>
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<p>Say you have a column <code class="docutils literal notranslate"><span class="pre">filename</span></code> which contains a filename. Normally
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you would see in phpMyAdmin only this filename. Using display transformations
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you can transform that filename into a HTML link, so you can click
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inside of the phpMyAdmin structure on the column’s link and will see
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the file displayed in a new browser window. Using transformation
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options you can also specify strings to append/prepend to a string or
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the format you want the output stored in.</p>
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<p>For a general overview of all available transformations and their
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options, you can either go to the <code class="docutils literal notranslate"><span class="pre">Change</span></code> link for an existing column
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or from the dialog to create a new column, in either case there is a link
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on that column structure page for “Browser display transformation” and
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“Input transformation” which will show more information about each
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transformation that is available on your system.</p>
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<p>For a tutorial on how to effectively use transformations, see our
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<a class="reference external" href="https://www.phpmyadmin.net/docs/">Link section</a> on the
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official phpMyAdmin homepage.</p>
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</div>
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<div class="section" id="usage">
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<span id="transformationshowto"></span><h2>Usage<a class="headerlink" href="#usage" title="Permalink to this headline">¶</a></h2>
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<p>Go to the table structure page (reached by clicking on
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the ‘Structure’ link for a table). There click on “Change” (or the change
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icon) and there you will see the five transformation–related fields at the end of the line.
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They are called ‘<a class="reference internal" href="glossary.html#term-Media-type"><span class="xref std std-term">Media type</span></a>’, ‘Browser transformation’ and
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‘Transformation options’.</p>
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<ul class="simple">
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<li><p>The field ‘<a class="reference internal" href="glossary.html#term-Media-type"><span class="xref std std-term">Media type</span></a>’ is a drop-down field. Select the <a class="reference internal" href="glossary.html#term-Media-type"><span class="xref std std-term">Media type</span></a> that
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corresponds to the column’s contents. Please note that many transformations
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are inactive until a <a class="reference internal" href="glossary.html#term-Media-type"><span class="xref std std-term">Media type</span></a> is selected.</p></li>
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<li><p>The field ‘Browser display transformation’ is a drop-down field. You can
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choose from a hopefully growing amount of pre-defined transformations.
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See below for information on how to build your own transformation.
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There are global transformations and mimetype-bound transformations.
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Global transformations can be used for any mimetype. They will take
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the mimetype, if necessary, into regard. Mimetype-bound
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transformations usually only operate on a certain mimetype. There are
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transformations which operate on the main mimetype (like ‘image’),
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which will most likely take the subtype into regard, and those who
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only operate on a specific subtype (like ‘image/jpeg’). You can use
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transformations on mimetypes for which the function was not defined
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for. There is no security check for you selected the right
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transformation, so take care of what the output will be like.</p></li>
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<li><p>The field ‘Browser display transformation options’ is a free-type textfield. You have
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to enter transform-function specific options here. Usually the
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transforms can operate with default options, but it is generally a
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good idea to look up the overview to see which options are necessary.
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Much like the ENUM/SET-Fields, you have to split up several options
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using the format ‘a’,’b’,’c’,…(NOTE THE MISSING BLANKS). This is
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because internally the options will be parsed as an array, leaving the
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first value the first element in the array, and so forth. If you want
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to specify a MIME character set you can define it in the
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transformation_options. You have to put that outside of the pre-
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defined options of the specific mime-transform, as the last value of
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the set. Use the format “’; charset=XXX’”. If you use a transform, for
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which you can specify 2 options and you want to append a character
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set, enter “‘first parameter’,’second parameter’,’charset=us-ascii’”.
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You can, however use the defaults for the parameters: “’’,’’,’charset
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=us-ascii’”. The default options can be configured using
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<span class="target" id="index-0"></span><a class="reference internal" href="config.html#cfg_DefaultTransformations"><code class="xref config config-option docutils literal notranslate"><span class="pre">$cfg['DefaultTransformations']</span></code></a>.</p></li>
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<li><p>‘Input transformation’ is another drop-down menu that corresponds exactly
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with the instructions above for “Browser display transformation” except
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these these affect the data before insertion in to the database. These are
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most commonly used to either provide a specialized editor (for example, using
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the phpMyAdmin SQL editor interface) or selector (such as for uploading an image).
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It’s also possible to manipulate the data such as converting an IPv4 address to binary
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or parsing it through a regular expression.</p></li>
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<li><p>Finally, ‘Input transformation options’ is the equivalent of the “Browser display
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transformation options” section above and is where optional and required parameters are entered.</p></li>
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</ul>
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</div>
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<div class="section" id="file-structure">
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<span id="transformationsfiles"></span><h2>File structure<a class="headerlink" href="#file-structure" title="Permalink to this headline">¶</a></h2>
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<p>All specific transformations for mimetypes are defined through class
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files in the directory <code class="file docutils literal notranslate"><span class="pre">libraries/classes/Plugins/Transformations/</span></code>. Each of
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them extends a certain transformation abstract class declared in
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<code class="file docutils literal notranslate"><span class="pre">libraries/classes/Plugins/Transformations/Abs</span></code>.</p>
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<p>They are stored in files to ease customization and to allow easy adding of
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new or custom transformations.</p>
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<p>Because the user cannot enter their own mimetypes, it is kept certain that
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the transformations will always work. It makes no sense to apply a
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transformation to a mimetype the transform-function doesn’t know to
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handle.</p>
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<p>There is a file called <code class="file docutils literal notranslate"><span class="pre">libraries/classes/Plugins/Transformations.php</span></code> that provides some
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basic functions which can be included by any other transform function.</p>
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<p>The file name convention is <code class="docutils literal notranslate"><span class="pre">[Mimetype]_[Subtype]_[Transformation</span>
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<span class="pre">Name].php</span></code>, while the abstract class that it extends has the
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name <code class="docutils literal notranslate"><span class="pre">[Transformation</span> <span class="pre">Name]TransformationsPlugin</span></code>. All of the
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methods that have to be implemented by a transformations plug-in are:</p>
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<ol class="arabic simple">
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<li><p>getMIMEType() and getMIMESubtype() in the main class;</p></li>
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<li><p>getName(), getInfo() and applyTransformation() in the abstract class
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it extends.</p></li>
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</ol>
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<p>The getMIMEType(), getMIMESubtype() and getName() methods return the
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name of the MIME type, MIME Subtype and transformation accordingly.
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getInfo() returns the transformation’s description and possible
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options it may receive and applyTransformation() is the method that
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does the actual work of the transformation plug-in.</p>
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<p>Please see the <code class="file docutils literal notranslate"><span class="pre">libraries/classes/Plugins/Transformations/TEMPLATE</span></code> and
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<code class="file docutils literal notranslate"><span class="pre">libraries/classes/Plugins/Transformations/TEMPLATE_ABSTRACT</span></code> files for adding
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your own transformation plug-in. You can also generate a new
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transformation plug-in (with or without the abstract transformation
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class), by using
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<code class="file docutils literal notranslate"><span class="pre">scripts/transformations_generator_plugin.sh</span></code> or
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<code class="file docutils literal notranslate"><span class="pre">scripts/transformations_generator_main_class.sh</span></code>.</p>
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<p>The applyTransformation() method always gets passed three variables:</p>
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<ol class="arabic simple">
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<li><p><strong>$buffer</strong> - Contains the text inside of the column. This is the
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text, you want to transform.</p></li>
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<li><p><strong>$options</strong> - Contains any user-passed options to a transform
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function as an array.</p></li>
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<li><p><strong>$meta</strong> - Contains an object with information about your column. The
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data is drawn from the output of the <a class="reference external" href="https://www.php.net/mysql_fetch_field">mysql_fetch_field()</a> function. This means, all
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object properties described on the <a class="reference external" href="https://www.php.net/mysql_fetch_field">manual page</a> are available in this
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variable and can be used to transform a column accordingly to
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unsigned/zerofill/not_null/… properties. The $meta->mimetype
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variable contains the original <a class="reference internal" href="glossary.html#term-Media-type"><span class="xref std std-term">Media type</span></a> of the column (i.e.
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‘text/plain’, ‘image/jpeg’ etc.)</p></li>
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</ol>
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</div>
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</div>
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<div class="clearer"></div>
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</div>
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<div class="sphinxsidebar" role="navigation" aria-label="main navigation">
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<div class="sphinxsidebarwrapper">
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<h3><a href="index.html">Table of Contents</a></h3>
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<ul>
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<li><a class="reference internal" href="#">Transformations</a><ul>
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<li><a class="reference internal" href="#introduction">Introduction</a></li>
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<li><a class="reference internal" href="#usage">Usage</a></li>
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<li><a class="reference internal" href="#file-structure">File structure</a></li>
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</ul>
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</li>
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</ul>
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<h4>Previous topic</h4>
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<p class="topless"><a href="two_factor.html"
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title="previous chapter">Two-factor authentication</a></p>
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<h4>Next topic</h4>
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<p class="topless"><a href="bookmarks.html"
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title="next chapter">Bookmarks</a></p>
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<div role="note" aria-label="source link">
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<h3>This Page</h3>
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<ul class="this-page-menu">
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<li><a href="_sources/transformations.rst.txt"
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rel="nofollow">Show Source</a></li>
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>previous</a> |</li>
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<li class="nav-item nav-item-1"><a href="user.html" >User Guide</a> »</li>
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<li class="nav-item nav-item-this"><a href="">Transformations</a></li>
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