hibernate连接池管理

hibernate配置文件有多种方式。

今天记录两种配置，一种比较基础，另一种专业一些。

第一种，初学的时候用的，即hibernate.cfg.xml

<hibernate-configuration>
	<session-factory>
		<property name="connection.url">
			jdbc:mysql://localhost:3306/test
		</property>
		<property name="connection.username">root</property>
		<property name="connection.password">1234</property>
		<property name="connection.driver_class">
			com.mysql.jdbc.Driver
		</property>
		<property name="dialect">
			org.hibernate.dialect.MySQLDialect
		</property>
		
		<property name="format_sql">true</property>
		<property name="show_sql">true</property>
		<property name="hibernate.id.new_generator_mappings">true</property>
		<property name="current_session_context_class">thread</property>
		
		<mapping resource="entity\Category.hbm.xml" />

<!-- 此处使用了hibernate映射文件的方式与数据库表连接

如果使用annotation配置，即<mapping class="entity.Category">

-->

	</session-factory>
</hibernate-configuration>

第二种使用c3p0连接池管理，这种配置方法在使用spring框架时更为常见。

首先配置c3p0-config.xml，这个文件名是固定的，只有这样才会被自动加载。

<c3p0-config>
  <default-config>
    <property name="initialPoolSize">3</property><!-- default 3 between minPoolSize and maxPoolSize -->
    <property name="minPoolSize">3</property><!-- default 3 -->
    <property name="maxPoolSize">15</property><!-- default 15 -->
    
    <property name="maxConnectionAge">0</property><!-- default 0 最长周期时间 -->
    <property name="maxIdleTime">0</property><!-- default 0 最长闲置时间 -->
    <property name="maxStatements">0</property><!-- default 0 -->
    <property name="maxStatementsPerConnection">0</property><!-- default 0 -->
    
    <property name="checkoutTimeout">0</property><!-- default 0ms -->
    <property name="idleConnectionTestPeriod">0</property><!-- default 0 -->
    <property name="testConnectionOnCheckin">false</property><!-- default false -->
    <property name="testConnectionOnCheckout">false</property><!-- default false -->
    <property name="numHelperThreads">3</property><!-- default 3 -->
    
    <property name="acquireIncrement">3</property><!-- default 3 -->
    <property name="acquireRetryAttempts">30</property><!-- default 30 -->
    <property name="acquireRetryDelay">1000</property><!-- default 1000ms -->
    <property name="breakAfterAcquireFailure">false</property><!-- default false -->
    <property name="autoCommitOnClose">false</property><!-- default false -->
    
    <property name="connectionTesterClassName">com.mchange.v2.c3p0.impl.DefaultConnectionTester</property><!-- Default: com.mchange.v2.c3p0.impl.DefaultConnectionTester -->
    
    <property name="forceIgnoreUnresolvedTransactions">false</property><!-- default false -not recommend -->
    <property name="propertyCycle">0</property><!-- default 0 -->
    
    <property name="debugUnreturnedConnectionStackTraces">false</property><!-- default false -->
    <property name="unreturnedConnectionTimeout">0</property><!-- default 0 -->
  </default-config>

  <!-- define different datasources -->
  <named-config name="c3p0DataSource">
	<property name="driverClass">net.sourceforge.jtds.jdbc.Driver</property>
	<property name="jdbcUrl">jdbc:jtds:sqlserver://WN7X64-DZD9X2X;DatabaseName=bms_java</property>
	<property name="user">TIP_JAVA</property>
	<property name="password">@JavaSummer12</property>
  </named-config>
</c3p0-config>

 配置完c3p0-config.xml，就要在applicationConfig.xml中配置bean了

	<bean id="c3p0DataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
		<constructor-arg name="configName" value="c3p0DataSource" />
	</bean>
	
	<bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
		<property name="dataSource" ref="c3p0DataSource" />
		<property name="hibernateProperties">
			<value>
				hibernate.dialect = org.hibernate.dialect.SQLServerDialect
				hibernate.show_sql = true
				hibernate.format_sql = true
			</value>
		</property>
		<property name="annotatedClasses">
			<list>
			
				<value>bean.Book</value>
				<value>bean.BookApply</value>
				<value>bean.BorrowInfo</value>
				<value>bean.Catagory</value>
				<value>bean.User</value>
			</list>
		</property>
	</bean>
	
	<bean id="baseDao" class="com.dell.bms.dao.impl.BaseDaoImpl">
		<property name="sessionFactory" ref="sessionFactory" />
	</bean>
	
	<bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
	   <property name="sessionFactory">
	       <ref bean="sessionFactory"/>
	   </property>
	</bean>