diff options
| 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/connecting.html | |
| parent | c4dd200c1155a118afa32cd91d9bd67bc243f83a (diff) | |
Moved tutorial to new user guide directory.
Diffstat (limited to 'user_guide/database/connecting.html')
| -rw-r--r-- | user_guide/database/connecting.html | 188 |
1 files changed, 0 insertions, 188 deletions
diff --git a/user_guide/database/connecting.html b/user_guide/database/connecting.html deleted file mode 100644 index 309f2bc1a..000000000 --- a/user_guide/database/connecting.html +++ /dev/null @@ -1,188 +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>Connecting to your Database : 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> › -Connecting -</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>Connecting to your Database</h1> - -<p>There are two ways to connect to a database:</p> - -<h2>Automatically Connecting</h2> - -<p>The "auto connect" feature will load and instantiate the database class with every page load. -To enable "auto connecting", add the word <var>database</var> to the library array, as indicated in the following file:</p> - -<p><kbd>application/config/autoload.php</kbd></p> - -<h2>Manually Connecting</h2> - -<p>If only some of your pages require database connectivity you can manually connect to your database by adding this -line of code in any function where it is needed, or in your class constructor to make the database -available globally in that class.</p> - -<code>$this->load->database();</code> - -<p class="important">If the above function does <strong>not</strong> contain any information in the first parameter it will connect -to the group specified in your database config file. For most people, this is the preferred method of use.</p> - -<h3>Available Parameters</h3> - -<ol> - <li>The database connection values, passed either as an array or a DSN string.</li> - <li>TRUE/FALSE (boolean). Whether to return the connection ID (see Connecting to Multiple Databases below).</li> - <li>TRUE/FALSE (boolean). Whether to enable the Active Record class. Set to TRUE by default.</li> -</ol> - - -<h3>Manually Connecting to a Database</h3> - -<p>The first parameter of this function can <strong>optionally</strong> be used to specify a particular database group -from your config file, or you can even submit connection values for a database that is not specified in your config file. -Examples:</p> - -<p>To choose a specific group from your config file you can do this:</p> - -<code>$this->load->database('<samp>group_name</samp>');</code> - -<p>Where <samp>group_name</samp> is the name of the connection group from your config file.</p> - - -<p>To connect manually to a desired database you can pass an array of values:</p> - -<code>$config['hostname'] = "localhost";<br /> -$config['username'] = "myusername";<br /> -$config['password'] = "mypassword";<br /> -$config['database'] = "mydatabase";<br /> -$config['dbdriver'] = "mysql";<br /> -$config['dbprefix'] = "";<br /> -$config['pconnect'] = FALSE;<br /> -$config['db_debug'] = TRUE;<br /> -$config['cache_on'] = FALSE;<br /> -$config['cachedir'] = "";<br /> -$config['char_set'] = "utf8";<br /> -$config['dbcollat'] = "utf8_general_ci";<br /> -<br /> -$this->load->database(<samp>$config</samp>);</code> - -<p>For information on each of these values please see the <a href="configuration.html">configuration page</a>.</p> - -<p>Or you can submit your database values as a Data Source Name. DSNs must have this prototype:</p> - -<code>$dsn = 'dbdriver://username:password@hostname/database';<br /> -<br /> -$this->load->database(<samp>$dsn</samp>);</code> - -<p>To override default config values when connecting with a DSN string, add the config variables as a query string.</p> - -<code>$dsn = 'dbdriver://username:password@hostname/database?char_set=utf8&dbcollat=utf8_general_ci&cache_on=true&cachedir=/path/to/cache';<br /> -<br /> -$this->load->database(<samp>$dsn</samp>);</code> - -<h2>Connecting to Multiple Databases</h2> - -<p>If you need to connect to more than one database simultaneously you can do so as follows:</p> - - -<code>$DB1 = $this->load->database('group_one', TRUE);<br /> -$DB2 = $this->load->database('group_two', TRUE); -</code> - -<p>Note: Change the words "group_one" and "group_two" to the specific group names you are connecting to (or -you can pass the connection values as indicated above).</p> - -<p>By setting the second parameter to TRUE (boolean) the function will return the database object.</p> - -<div class="important"> -<p>When you connect this way, you will use your object name to issue commands rather than the syntax used throughout this guide. In other words, rather than issuing commands with:</p> - -<p>$this->db->query();<br />$this->db->result();<br /> etc...</p> - -<p>You will instead use:</p> - -<p>$DB1->query();<br />$DB1->result();<br /> etc...</p> - -</div> - -<h2>Reconnecting / Keeping the Connection Alive</h2> - -<p>If the database server's idle timeout is exceeded while you're doing some heavy PHP lifting (processing an image, for instance), you should consider pinging the server by using the <dfn>reconnect()</dfn> method before sending further queries, which can gracefully keep the connection alive or re-establish it.</p> - -<code>$this->db->reconnect();</code> - -<h2>Manually closing the Connection</h2> - -<p>While CodeIgniter intelligently takes care of closing your database connections, you can explicitly close the connection.</p> - -<code>$this->db->close();</code> -</div> -<!-- END CONTENT --> - - -<div id="footer"> -<p> -Previous Topic: <a href="configuration.html">Database Configuration</a> - · -<a href="#top">Top of Page</a> · -<a href="../index.html">User Guide Home</a> · -Next Topic: <a href="queries.html">Queries</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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