连接池的初次接触（DBCP和C3P0）_dbcp 初次获取连接较慢-优快云博客

本文介绍如何配置DBCP和C3P0两种数据库连接池，并展示了具体的XML配置示例，包括连接池的基本属性设置及与Hibernate框架的整合。

DBCP连接池

 <bean class="org.apache.commons.dbcp2.BasicDataSource" id="dataSource">
		<property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
		<property name="url" value="jdbc:mysql://localhost:3306/test0116_spring"></property>
		<property name="username" value="root"></property>
		<property name="password" value="root"></property>
		<property name="initialSize" value="20"></property>
		<property name="maxTotal" value="100"></property>
	</bean>

C3P0连接池

<bean class="com.mchange.v2.c3p0.ComboPooledDataSource" id="dataSource">
		<property name="driverClass" value="com.mysql.jdbc.Driver"></property>
		<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/test0116_spring"></property>
		<property name="user" value="root"></property>
		<property name="password" value="root"></property>
		<property name="maxPoolSize" value="100"></property>
		<property name="initialPoolSize" value="20"></property>
	</bean>

后续：

不使用连接池

<bean class="org.springframework.jdbc.datasource.DriverManagerDataSource" id="dataSource">
		<property name="url" value="jdbc:mysql://localhost:3306/test0116_spring"></property>
		<property name="username" value="root"></property>
		<property name="password" value="root"></property>
		<property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
		</bean>

<bean class="org.springframework.orm.hibernate5.LocalSessionFactoryBean" id="localSessionFactoryBean">
		<property name="dataSource" value="#{dataSource}"></property>
		<!-- 配置hibernate -->
		<property name="hibernateProperties">
			<props>
				<prop key="hibernate.show_sql">true</prop>
				<prop key="hibernate.format_sql">true</prop>
			</props>
		</property>
		
		<!-- 配置映射文件 -->
		<property name="annotatedClasses">
			<array>
				<value>com.kevin.pojo.User</value>
			</array>
		</property>
	</bean>
	
	<bean class="org.springframework.orm.hibernate5.HibernateTemplate" id="hibernateTemplate">
		<property name="sessionFactory" value="#{localSessionFactoryBean}"></property>
	</bean>