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| author | Joël Cox <joel@joelcox.nl> | 2011-10-09 18:39:39 +0200 |
|---|---|---|
| committer | Joël Cox <joel@joelcox.nl> | 2011-10-09 18:39:39 +0200 |
| commit | f4fb1db458fab52d0493ead52c9ea7e01206eaa7 (patch) | |
| tree | c549600f342f4d3f0df75a2f2f7c265be0f1cc72 /user_guide/database/utilities.html | |
| parent | c4dd200c1155a118afa32cd91d9bd67bc243f83a (diff) | |
Moved tutorial to new user guide directory.
Diffstat (limited to 'user_guide/database/utilities.html')
| -rw-r--r-- | user_guide/database/utilities.html | 314 |
1 files changed, 0 insertions, 314 deletions
diff --git a/user_guide/database/utilities.html b/user_guide/database/utilities.html deleted file mode 100644 index 8231c7e78..000000000 --- a/user_guide/database/utilities.html +++ /dev/null @@ -1,314 +0,0 @@ -<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> -<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> -<head> - -<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> -<title>Database Utility Class : CodeIgniter User Guide</title> - -<style type='text/css' media='all'>@import url('../userguide.css');</style> -<link rel='stylesheet' type='text/css' media='all' href='../userguide.css' /> - -<script type="text/javascript" src="../nav/nav.js"></script> -<script type="text/javascript" src="../nav/prototype.lite.js"></script> -<script type="text/javascript" src="../nav/moo.fx.js"></script> -<script type="text/javascript" src="../nav/user_guide_menu.js"></script> - -<meta http-equiv='expires' content='-1' /> -<meta http-equiv= 'pragma' content='no-cache' /> -<meta name='robots' content='all' /> -<meta name='author' content='ExpressionEngine Dev Team' /> -<meta name='description' content='CodeIgniter User Guide' /> - -</head> -<body> - -<!-- START NAVIGATION --> -<div id="nav"><div id="nav_inner"><script type="text/javascript">create_menu('../');</script></div></div> -<div id="nav2"><a name="top"></a><a href="javascript:void(0);" onclick="myHeight.toggle();"><img src="../images/nav_toggle_darker.jpg" width="154" height="43" border="0" title="Toggle Table of Contents" alt="Toggle Table of Contents" /></a></div> -<div id="masthead"> -<table cellpadding="0" cellspacing="0" border="0" style="width:100%"> -<tr> -<td><h1>CodeIgniter User Guide Version 2.0.3</h1></td> -<td id="breadcrumb_right"><a href="../toc.html">Table of Contents Page</a></td> -</tr> -</table> -</div> -<!-- END NAVIGATION --> - - -<!-- START BREADCRUMB --> -<table cellpadding="0" cellspacing="0" border="0" style="width:100%"> -<tr> -<td id="breadcrumb"> -<a href="http://codeigniter.com/">CodeIgniter Home</a> › -<a href="../index.html">User Guide Home</a> › -<a href="index.html">Database Library</a> › -Database Utility Class -</td> -<td id="searchbox"><form method="get" action="http://www.google.com/search"><input type="hidden" name="as_sitesearch" id="as_sitesearch" value="codeigniter.com/user_guide/" />Search User Guide <input type="text" class="input" style="width:200px;" name="q" id="q" size="31" maxlength="255" value="" /> <input type="submit" class="submit" name="sa" value="Go" /></form></td> -</tr> -</table> -<!-- END BREADCRUMB --> - - -<br clear="all" /> - - -<!-- START CONTENT --> -<div id="content"> - -<h1>Database Utility Class</h1> - -<p>The Database Utility Class contains functions that help you manage your database.</p> - -<h3>Table of Contents</h3> - -<ul> -<li><a href="#init">Initializing the Utility Class</a></li> -<li><a href="#list">Listing your Databases</a></li> -<li><a href="#exists">Checking for a specific Database</a></li> -<li><a href="#opttb">Optimizing your Tables</a></li> -<li><a href="#repair">Repairing your Databases</a></li> -<li><a href="#optdb">Optimizing your Database</a></li> -<li><a href="#csv">CSV Files from a Database Result</a></li> -<li><a href="#xml">XML Files from a Database Result</a></li> -<li><a href="#backup">Backing up your Database</a></li> -</ul> - - - -<h2><a name="init"></a>Initializing the Utility Class</h2> - -<p class="important"><strong>Important:</strong> In order to initialize the Utility class, your database driver must -already be running, since the utilities class relies on it.</p> - -<p>Load the Utility Class as follows:</p> - -<code>$this->load->dbutil()</code> - -<p>Once initialized you will access the functions using the <dfn>$this->dbutil</dfn> object:</p> - -<code>$this->dbutil->some_function()</code> - -<h2><a name="list"></a>$this->dbutil->list_databases()</h2> -<p>Returns an array of database names:</p> - -<code> -$dbs = $this->dbutil->list_databases();<br /> -<br /> -foreach ($dbs as $db)<br /> -{<br /> - echo $db;<br /> -}</code> - - -<h2><a name="exists"></a>$this->dbutil->database_exists();</h2> - -<p>Sometimes it's helpful to know whether a particular database exists. -Returns a boolean TRUE/FALSE. Usage example:</p> - -<code> -if ($this->dbutil->database_exists('database_name'))<br /> -{<br /> - // some code...<br /> -} -</code> - -<p>Note: Replace <em>database_name</em> with the name of the table you are looking for. This function is case sensitive.</p> - - - -<h2><a name="opttb"></a>$this->dbutil->optimize_table('table_name');</h2> - -<p class="important"><strong>Note:</strong> This features is only available for MySQL/MySQLi databases.</p> - - -<p>Permits you to optimize a table using the table name specified in the first parameter. Returns TRUE/FALSE based on success or failure:</p> - -<code> -if ($this->dbutil->optimize_table('table_name'))<br /> -{<br /> - echo 'Success!';<br /> -} -</code> - -<p><strong>Note:</strong> Not all database platforms support table optimization.</p> - - -<h2><a name="repair"></a>$this->dbutil->repair_table('table_name');</h2> - -<p class="important"><strong>Note:</strong> This features is only available for MySQL/MySQLi databases.</p> - - -<p>Permits you to repair a table using the table name specified in the first parameter. Returns TRUE/FALSE based on success or failure:</p> - -<code> -if ($this->dbutil->repair_table('table_name'))<br /> -{<br /> - echo 'Success!';<br /> -} -</code> - -<p><strong>Note:</strong> Not all database platforms support table repairs.</p> - - -<h2><a name="optdb"></a>$this->dbutil->optimize_database();</h2> - -<p class="important"><strong>Note:</strong> This features is only available for MySQL/MySQLi databases.</p> - -<p>Permits you to optimize the database your DB class is currently connected to. Returns an array containing the DB status messages or FALSE on failure.</p> - -<code> -$result = $this->dbutil->optimize_database();<br /> -<br /> -if ($result !== FALSE)<br /> -{<br /> - print_r($result);<br /> -} -</code> - -<p><strong>Note:</strong> Not all database platforms support table optimization.</p> - - -<h2><a name="csv"></a>$this->dbutil->csv_from_result($db_result)</h2> - -<p>Permits you to generate a CSV file from a query result. The first parameter of the function must contain the result object from your query. -Example:</p> - -<code> -$this->load->dbutil();<br /> -<br /> -$query = $this->db->query("SELECT * FROM mytable");<br /> -<br /> -echo $this->dbutil->csv_from_result($query); -</code> - -<p>The second and third parameters allows you to -set the delimiter and newline character. By default tabs are used as the delimiter and "\n" is used as a new line. Example:</p> - -<code> -$delimiter = ",";<br /> -$newline = "\r\n";<br /> -<br /> -echo $this->dbutil->csv_from_result($query, $delimiter, $newline); -</code> - -<p><strong>Important:</strong> This function will NOT write the CSV file for you. It simply creates the CSV layout. -If you need to write the file use the <a href="../helpers/file_helper.html">File Helper</a>.</p> - - -<h2><a name="xml"></a>$this->dbutil->xml_from_result($db_result)</h2> - -<p>Permits you to generate an XML file from a query result. The first parameter expects a query result object, the second -may contain an optional array of config parameters. Example:</p> - -<code> -$this->load->dbutil();<br /> -<br /> -$query = $this->db->query("SELECT * FROM mytable");<br /> -<br /> -$config = array (<br /> - 'root' => 'root',<br /> - 'element' => 'element', <br /> - 'newline' => "\n", <br /> - 'tab' => "\t"<br /> - );<br /> -<br /> -echo $this->dbutil->xml_from_result($query, $config); -</code> - -<p><strong>Important:</strong> This function will NOT write the XML file for you. It simply creates the XML layout. -If you need to write the file use the <a href="../helpers/file_helper.html">File Helper</a>.</p> - - -<h2><a name="backup"></a>$this->dbutil->backup()</h2> - -<p>Permits you to backup your full database or individual tables. The backup data can be compressed in either Zip or Gzip format.</p> - -<p class="important"><strong>Note:</strong> This features is only available for MySQL databases.</p> - -<p>Note: Due to the limited execution time and memory available to PHP, backing up very large -databases may not be possible. If your database is very large you might need to backup directly from your SQL server -via the command line, or have your server admin do it for you if you do not have root privileges.</p> - -<h3>Usage Example</h3> - -<code> -<dfn>// Load the DB utility class</dfn><br /> -$this->load->dbutil();<br /><br /> - -<dfn>// Backup your entire database and assign it to a variable</dfn><br /> -$backup =& $this->dbutil->backup(); - -<br /><br /> -<dfn>// Load the file helper and write the file to your server</dfn><br /> -$this->load->helper('file');<br /> -write_file('/path/to/mybackup.gz', $backup); - -<br /><br /> -<dfn>// Load the download helper and send the file to your desktop</dfn><br /> -$this->load->helper('download');<br /> -force_download('mybackup.gz', $backup); -</code> - -<h3>Setting Backup Preferences</h3> - -<p>Backup preferences are set by submitting an array of values to the first parameter of the backup function. Example:</p> - -<code>$prefs = array(<br /> - 'tables' => array('table1', 'table2'), // Array of tables to backup.<br /> - 'ignore' => array(), // List of tables to omit from the backup<br /> - 'format' => 'txt', // gzip, zip, txt<br /> - 'filename' => 'mybackup.sql', // File name - NEEDED ONLY WITH ZIP FILES<br /> - 'add_drop' => TRUE, // Whether to add DROP TABLE statements to backup file<br /> - 'add_insert' => TRUE, // Whether to add INSERT data to backup file<br /> - 'newline' => "\n" // Newline character used in backup file<br /> - );<br /> -<br /> -$this->dbutil->backup($prefs); -</code> - - -<h3>Description of Backup Preferences</h3> - -<table cellpadding="0" cellspacing="1" border="0" style="width:100%" class="tableborder"> -<tr> -<th>Preference</th> -<th>Default Value</th> -<th>Options</th> -<th>Description</th> -</tr><tr> -<td class="td"><strong>tables</strong></td><td class="td">empty array</td><td class="td">None</td><td class="td">An array of tables you want backed up. If left blank all tables will be exported.</td> -</tr><tr> -<td class="td"><strong>ignore</strong></td><td class="td">empty array</td><td class="td">None</td><td class="td">An array of tables you want the backup routine to ignore.</td> -</tr><tr> -<td class="td"><strong>format</strong></td><td class="td">gzip</td><td class="td">gzip, zip, txt</td><td class="td">The file format of the export file.</td> -</tr><tr> -<td class="td"><strong>filename</strong></td><td class="td">the current date/time</td><td class="td">None</td><td class="td">The name of the backed-up file. The name is needed only if you are using zip compression.</td> -</tr><tr> -<td class="td"><strong>add_drop</strong></td><td class="td">TRUE</td><td class="td">TRUE/FALSE</td><td class="td">Whether to include DROP TABLE statements in your SQL export file.</td> -</tr><tr> -<td class="td"><strong>add_insert</strong></td><td class="td">TRUE</td><td class="td">TRUE/FALSE</td><td class="td">Whether to include INSERT statements in your SQL export file.</td> -</tr><tr> -<td class="td"><strong>newline</strong></td><td class="td">"\n"</td><td class="td">"\n", "\r", "\r\n"</td><td class="td">Type of newline to use in your SQL export file.</td> - -</tr> -</table> - - -</div> -<!-- END CONTENT --> - - -<div id="footer"> -<p> -Previous Topic: <a href="forge.html">DB Forge Class</a> - · -<a href="#top">Top of Page</a> · -<a href="../index.html">User Guide Home</a> · -Next Topic: <a href="../libraries/javascript.html">Javascript Class</a></p> -<p><a href="http://codeigniter.com">CodeIgniter</a> · Copyright © 2006 - 2011 · <a href="http://ellislab.com/">EllisLab, Inc.</a></p> -</div> - -</body> -</html>
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