[tomcat] tomcat db connect pool

context.xml

    <Resource
    	name="jdbc/oracle"
    	auth="Container"
    	type="javax.sql.DataSource"
    	driverClassName="oracle.jdbc.OracleDriver"
    	url="jdbc:oracle:thin:@localhost:1521:XE"
    	username="scott"
    	password="tiger"
    	maxActive="50"
    	maxWait="-1">
    </Resource>