hibernate连接池

1．Hibernate默认连接池 Z'E@sc 9  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> D^pAf/ek@i  
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<!-- 连接数据库的URL--> ?h5Y^}8Qg  
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<property name="connection.url"> ]2<g"zo0  
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jdbc:mysql://localhost:3306/schoolproject fRbVc  
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<property name="connection.useUnicode">true</property> 4B|f}7%\  
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<property name="connection.characterEncoding">UTF-8</property> ?
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<property name="connection.username">root</property> v;OA hFr|  
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2．C3P0连接配置 M]oaWQu  
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<property name="connection.url"> |'.\}xt7  
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jdbc:mysql://localhost:3306/schoolproject )[>{ Ie2  
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<property name="connection.useUnicode">true</property> y4+Km*am,W  
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<property name="hibernate.c3p0.max_size">20</property> 4;=+qb  
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<property name="hibernate.c3p0.min_size">5</property> |bDUekjR  
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<property name="hibernate.c3p0.timeout">120</property> 3,t3\`=  
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<property name="hibernate.c3p0.max_statements">100</property> jY
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<property name="hibernate.c3p0.idle_test_period">120</property> @#rF8;  
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<property name="hibernate.c3p0.acquire_increment">2</property> l]C#bL>i  
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3．proxool连接池 "lLwgh;  
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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 W-D{cU  
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<proxool> tzJ7wXRr  
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<alias>DBPool</alias> 4g+Dp&U  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 pF/s5z  
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<driver-class>com.mysql.jdbc.Driver</driver-class> 8B!MgNKV  
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<driver-properties> ]$~\GE^  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> NK\0X5##.  
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<maximum-new-connections>20</maximum-new-connections> lk*wM?Z  
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<minimum-connection-count>10</minimum-connection-count> Ax6zx  
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(2)配置hibernate.cfg.xml文件 @HE<\Z{ KI  
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<property name="hibernate.proxool.pool_alias">DBPool</property> {]%7-4E  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> cSjX/%*!m  
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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 q
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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 m{&lU@uL  
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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`_{%T  
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(4) dialect是声明ＳＱＬ语句的方言  N!Xn)J  

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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。 );?tGX  
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(6) <mapping >资源文件映射 @V&HE:P  
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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： gB>AYL%o=  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 A"0Yn(awWu  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory UGvUU<N|N  
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hibernate.transaction.manager_loopup_class = (,|eE)+  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect t0za%q!fK<