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| author | admin <devnull@localhost> | 2006-08-25 19:25:49 +0200 |
|---|---|---|
| committer | admin <devnull@localhost> | 2006-08-25 19:25:49 +0200 |
| commit | b0dd10f8171945e0c1f3527dd1e9d18b043e01a7 (patch) | |
| tree | c3583ba09e72217683c4304f4690df6ce39ba731 /user_guide/libraries/database/connecting.html | |
Initial Import
Diffstat (limited to 'user_guide/libraries/database/connecting.html')
| -rw-r--r-- | user_guide/libraries/database/connecting.html | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/user_guide/libraries/database/connecting.html b/user_guide/libraries/database/connecting.html new file mode 100644 index 000000000..7bf93c302 --- /dev/null +++ b/user_guide/libraries/database/connecting.html @@ -0,0 +1,172 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html>
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+<div id="masthead">
+<table cellpadding="0" cellspacing="0" border="0" style="width:100%">
+<tr>
+<td><h1>Code Igniter User Guide Version 1.4.0</h1></td>
+<td id="breadcrumb_right"><a href="../../toc.html">Full Table of Contents</a></td>
+</tr>
+</table>
+</div>
+<!-- END NAVIGATION -->
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+<a href="http://www.codeigniter.com/">Code Igniter 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="www.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>
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+
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+<br clear="all" />
+
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+<!-- 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 core 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>$this->load->database();</code>
+
+<p class="important">If the above function does <strong>not</strong> contain any information in the first parameter it will connect
+to the group specified in your database config file. For most people, this is the preferred method of use.</p>
+
+
+<p>The first parameter of this function can <strong>optionally</strong> be used to specify a particular database group
+from your config file, or you can even submit connection values for a database that is not specified in your config file.
+Examples:</p>
+
+<p>To choose a specific group from your config file you can do this:</p>
+
+<code>$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 />
+$config['active_r'] = TRUE;<br />
+<br />
+$this->load->database(<samp>$config</samp>);</code>
+
+<p>For information on each of these values please see the <a href="configuration.html">configuration page</a>.
+
+<p>Or you can submit your database values as a Data Source Name. DSNs must have this prototype:
+
+<code>$dsn = 'dbdriver://username:password@hostname/database';<br />
+<br />
+$this->load->database('<samp>$dsn</samp>');</code>
+
+<p>Note that if you use a DSN you will not be able to specify some of the default values like you can if you use a connection array.</p>
+
+
+
+
+<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>
+
+
+
+
+
+</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> ·
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