hibernate3配置c3p0连接池
Hibernate.cfg.xml配置文件如下：

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE hibernate-configuration PUBLIC          "-//Hibernate/Hibernate Configuration DTD 3.0//EN"          "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"><hibernate-configuration><session-factory><property name="connection.url">jdbc:oracle:thin:@hotname:1521:service_name</property><property name="connection.username">username</property><property name="connection.password">password</property><property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property><property name="connection.characterEncoding">UTF-8</property><property name="dialect">org.hibernate.dialect.Oracle10gDialect</property><property name="hibernate.show_sql">True</property><property name="hibernate.transaction.factory_class">org.hibernate.transaction.JDBCTransactionFactory</property><property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider</property><property name="hibernate.c3p0.max_size">20</property><property name="hibernate.c3p0.min_size">5</property><property name="hibernate.c3p0.timeout">120</property><property name="hibernate.c3p0.max_statements">100</property><property name="hibernate.c3p0.idle_test_period">120</property><property name="hibernate.c3p0.acquire_increment">2</property><mapping resource="package/*.hbm.xml" /></session-factory></hibernate-configuration>