Following file contain the database connection:
/development/definition/database.xml
This file automatically generate during installation.We can create multiple connection to hook in Multiple Database. In definition file there must be a connection called primary which used as a default database connection. See below example:
<?xml version="1.0" encoding="utf-8"?>
<database>
<base>
<date><![CDATA[22/12/2012]]></date>
</base>
<connections>
<connection>
<cname>primary</cname>
<type><![CDATA[MYSQL]]></type>
<charset><![CDATA[utf8]]></charset>
<prefix><![CDATA[app_]]></prefix>
<host><![CDATA[localhost]]></host>
<dbname><![CDATA[apprain_301]]></dbname>
<username><![CDATA[root]]></username>
<password><![CDATA[123456]]></password>
<active>1</active>
</connection>
<connection>
<cname>conn2</cname>
<type><![CDATA[]]></type>
<charset><![CDATA[]]></charset>
<prefix><![CDATA[]]></prefix>
<host><![CDATA[]]></host>
<dbname><![CDATA[]]></dbname>
<username><![CDATA[]]></username>
<password><![CDATA[]]></password>
<active>0</active>
</connection>
</connections>
</database>