hibernate连接池

1．Hibernate默认连接池 u*l|MIi6J  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> $B+|
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<!-- 连接数据库的URL--> K2x[ApS#  
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<property name="connection.url"> C_.9qo]DT7  
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jdbc:mysql://localhost:3306/schoolproject &1xCPKIr  
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<property name="connection.useUnicode">true</property> $`=p]  
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<property name="connection.characterEncoding">UTF-8</property> fV(3RG  
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<!--连接的登录名--> !liV Y]  
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<property name="connection.username">root</property> THA9OXP  
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<property name="connection.password"></property> 4JSPD#%f  
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<!--是否将运行期生成的SQL输出到日志以供调试--> (}"D x3K
 
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> bm588UQ  
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<!--映射Student这个资源--> Ae)xFnuq3  
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2．C3P0连接配置 e4X df>B  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" c,UJ uCZ  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> 9rB3h`AVF  
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<property name="connection.url"> sYTz6-  
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jdbc:mysql://localhost:3306/schoolproject *MJm:  
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<property name="connection.useUnicode">true</property> J%|?[{rO{'  
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<property name="connection.username">root</property> 9#E *o~1  
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<!-- C3P0连接池设定--> )1<0c@g=  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider ]+lT*6P*  
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<property name="hibernate.c3p0.max_size">20</property> t Cuvb  
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<property name="hibernate.c3p0.min_size">5</property> 2BY|Cp4R  
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<property name="hibernate.c3p0.timeout">120</property> lL}6IZ5sb  
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<property name="hibernate.c3p0.max_statements">100</property>

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<property name="hibernate.c3p0.idle_test_period">120</property> u5CSx'h]  
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<property name="hibernate.c3p0.acquire_increment">2</property> R P{pEd  
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3．proxool连接池 e"@r[pq-{u  
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(1) 先写proxool的配置文件，文件名：proxool.xml（一般放在与hibernate.cfg.xml文件在同一个目录中）本例配置的是MYSQL数据库，数据库的名字为schoolproject
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Anything outside the "proxool" tag is ignored. --> #h ud_  
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<alias>DBPool</alias> Sh;`<Ggi~  
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<driver-url> *7*_QW%?A  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 h-.^*=]R6  
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<driver-class>com.mysql.jdbc.Driver</driver-class> gy1kb,MO  
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<property name="user" value="root"/> HJr*\%D}1  
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<!-- proxool自动侦察各个连接状态的时间间隔(毫秒),侦察到空闲的连接就马上回 X"8$,\wX,  
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收,超时的销毁--> WnQ'I=E#~  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> 7DW-brd   
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<maximum-new-connections>20</maximum-new-connections> TDtHRhq7  
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等待请求数由maximum-new-connections决定--> BD ,3JDqT  
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(2)配置hibernate.cfg.xml文件 CV,[x[L#{  
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<property name="hibernate.proxool.pool_alias">DBPool</property> dDk<J;~jGJ  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> D &wm7,  
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(1) hibernate.connection.provider_class定义Hibernate的连接加载类，这里Proxool连接池是用这个，不同的连接池有不同的加载类，可以查阅Hibernate文档获取相关信息 -i @!{ ?  
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(2) hibernate.proxool.pool_alias这里就是用我们上面提到的连接池的别名 ">voi$Kzey  
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(3) hibernate.proxool.xml是向Hibernate声明连接池的配置文件位置，可以用相对或绝对路径，用相对路径时要注意一定在要Path范围内！不然会抛出异常。 c#`Z[  
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(4) dialect是声明ＳＱＬ语句的方言 wEzLfZ Oz/  
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(5) show_sql定义是否显示Hibernate生成的ＳＱＬ语言，一般在调试阶段设为true,完成后再改成false，这样有利于调试。 %r~TMU2"  
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(6) <mapping >资源文件映射 G*wn[o(^j  
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4． JNDI连接池，数据源已经由应用服务配置好(如Web服务器)，Hibernate需要做的只是通过JNDI名查找到此数据源。应用服务器将连接池对外显示为JNDI绑定数据源，它是javax.jdbc.Datasource类的一个实例。只要配置一个Hibernate文件，如： C2eei're  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 \kWceu}H,  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory {u46m   
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hibernate.transaction.manager_loopup_class =
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