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| <td><h1>Code Igniter User Guide Version 1.4.0</h1></td> | |
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| <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> | |
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