1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
|
<!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 Configuration : 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 1.7.1</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> ›
Configuration
</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 Configuration</h1>
<p>CodeIgniter has a config file that lets you store your database connection values (username, password, database name, etc.).
The config file is located at:</p>
<p><kbd>application/config/database.php</kbd></p>
<p>The config settings are stored in a multi-dimensional array with this prototype:</p>
<code>$db['default']['hostname'] = "localhost";<br />
$db['default']['username'] = "root";<br />
$db['default']['password'] = "";<br />
$db['default']['database'] = "database_name";<br />
$db['default']['dbdriver'] = "mysql";<br />
$db['default']['dbprefix'] = "";<br />
$db['default']['pconnect'] = TRUE;<br />
$db['default']['db_debug'] = FALSE;<br />
$db['default']['cache_on'] = FALSE;<br />
$db['default']['cachedir'] = "";<br />
$db['default']['char_set'] = "utf8";<br />
$db['default']['dbcollat'] = "utf8_general_ci";</code>
<p>The reason we use a multi-dimensional array rather than a more simple one is to permit you to optionally store
multiple sets of connection values. If, for example, you run multiple environments (development, production, test, etc.)
under a single installation, you can set up a connection group for each, then switch between groups as needed.
For example, to set up a "test" environment you would do this:</p>
<code>$db['test']['hostname'] = "localhost";<br />
$db['test']['username'] = "root";<br />
$db['test']['password'] = "";<br />
$db['test']['database'] = "database_name";<br />
$db['test']['dbdriver'] = "mysql";<br />
$db['test']['dbprefix'] = "";<br />
$db['test']['pconnect'] = TRUE;<br />
$db['test']['db_debug'] = FALSE;<br />
$db['test']['cache_on'] = FALSE;<br />
$db['test']['cachedir'] = "";<br />
$db['test']['char_set'] = "utf8";<br />
$db['test']['dbcollat'] = "utf8_general_ci";</code>
<p>Then, to globally tell the system to use that group you would set this variable located in the config file:</p>
<code>$active_group = "test";</code>
<p>Note: The name "test" is arbitrary. It can be anything you want. By default we've used the word "default"
for the primary connection, but it too can be renamed to something more relevant to your project.</p>
<h3>Active Record</h3>
<p>The <a href="active_record.html">Active Record Class</a> is globally enabled or disabled by setting the $active_record variable in the database configuration file to TRUE/FALSE (boolean). If you are not using the active record class, setting it to FALSE will utilize fewer resources when the database classes are initialized.</p>
<code>$active_record = TRUE;</code>
<p class="important"><strong>Note:</strong> that some CodeIgniter classes such as Sessions require Active Records be enabled to access certain functionality.</p>
<h3>Explanation of Values:</h3>
<ul>
<li><strong>hostname</strong> - The hostname of your database server. Often this is "localhost".</li>
<li><strong>username</strong> - The username used to connect to the database.</li>
<li><strong>password</strong> - The password used to connect to the database.</li>
<li><strong>database</strong> - The name of the database you want to connect to.</li>
<li><strong>dbdriver</strong> - The database type. ie: mysql, postgres, odbc, etc. Must be specified in lower case.</li>
<li><strong>dbprefix</strong> - An optional table prefix which will added to the table name when running <a href="active_record.html">Active Record</a> queries. This permits multiple CodeIgniter installations to share one database.</li>
<li><strong>pconnect</strong> - TRUE/FALSE (boolean) - Whether to use a persistent connection.</li>
<li><strong>db_debug</strong> - TRUE/FALSE (boolean) - Whether database errors should be displayed.</li>
<li><strong>cache_on</strong> - TRUE/FALSE (boolean) - Whether database query caching is enabled, see also <a href="caching.html">Database Caching Class</a>.</li>
<li><strong>cachedir</strong> - The absolute server path to your database query cache directory.</li>
<li><strong>char_set</strong> - The character set used in communicating with the database.</li>
<li><strong>dbcollat</strong> - The character collation used in communicating with the database.</li>
<li><strong>port</strong> - The database port number. Currently only used with the Postgres driver. To use this value you have to add a line to the database config array.<code>$db['default']['port'] = 5432;</code></li>
</ul>
<p class="important"><strong>Note:</strong> Depending on what database platform you are using (MySQL, Postgres, etc.)
not all values will be needed. For example, when using SQLite you will not need to supply a username or password, and
the database name will be the path to your database file. The information above assumes you are using MySQL.</p>
</div>
<!-- END CONTENT -->
<div id="footer">
<p>
Previous Topic: <a href="examples.html">Quick Start: Usage Examples</a>
·
<a href="#top">Top of Page</a> ·
<a href="../index.html">User Guide Home</a> ·
Next Topic: <a href="connecting.html">Connecting to your Database</a>
</p>
<p><a href="http://codeigniter.com">CodeIgniter</a> · Copyright © 2006-2008 · <a href="http://ellislab.com/">Ellislab, Inc.</a></p>
</div>
</body>
</html>
|
