hibernate连接池

1．Hibernate默认连接池 !yfQ^a_
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<!DOCTYPE hibernate-configuration *irYSTA$  

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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> ;I#f:UQ  
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<property name="connection.url"> $;1TP|  
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<property name="connection.useUnicode">true</property> mfI>1W(  
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<property name="connection.username">root</property> BbV@ziL  
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<property name="connection.password"></property> >7[o=!^:4  
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<!--是否将运行期生成的SQL输出到日志以供调试--> $&C~Qti|G  
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2．C3P0连接配置 ]DO~7p[  
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<property name="connection.useUnicode">true</property> -y+u0,=p.  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider G3.MS7J  
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<property name="hibernate.c3p0.max_size">20</property> %~ROV>&  
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<property name="hibernate.c3p0.min_size">5</property> }&o*ZY-1  
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<property name="hibernate.c3p0.timeout">120</property> 9m:qQ1[\  
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<property name="hibernate.c3p0.max_statements">100</property> qZ:--,9+  
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<property name="hibernate.c3p0.idle_test_period">120</property> o#IQz_  
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<property name="hibernate.c3p0.acquire_increment">2</property> 4/rdr80  
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3．proxool连接池 07T"alXf:A  
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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 ACg5"  
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Anything outside the "proxool" tag is ignored. --> HNA/LJl[VU  
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<proxool>
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<alias>DBPool</alias> /5@V $c8  
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<driver-class>com.mysql.jdbc.Driver</driver-class> AF4:v<EN  
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<property name="user" value="root"/> `<Xq@\H  
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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 yjODa90!G  
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收,超时的销毁--> OPR+K ?  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> GwHMXtj4  
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<maximum-new-connections>20</maximum-new-connections> MhN)ZhsC  
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等待请求数由maximum-new-connections决定--> DQM\Y{y|3  
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<minimum-connection-count>10</minimum-connection-count> 9\RSJGx6  
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(2)配置hibernate.cfg.xml文件 '"LrGvkZ  
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<property name="hibernate.connection.provider_class"> VAf"B5R  
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<property name="hibernate.proxool.pool_alias">DBPool</property> i-[ic!RnKj  
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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 &R+/Ie#0dz  
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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 ^R- -&{I  
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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。 ~+w'b7T,=  
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(4) dialect是声明ＳＱＬ语句的方言 aphfzo  
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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。 GJ"S*30  
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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： Qj;wklq  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 2;h4$^`dt  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory ILi{5L  
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