hibernate连接池

1．Hibernate默认连接池 }#va#Nb(,  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> y\Su!?4!  
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<property name="connection.url"> ~gU.z6us  
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<property name="connection.useUnicode">true</property> @n<y[WA  
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<property name="connection.characterEncoding">UTF-8</property> wXd
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<property name="connection.username">root</property> LS1r}cl  
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2．C3P0连接配置 ^(,qkq'u D  
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<property name="connection.url"> +(>!nsf  
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jdbc:mysql://localhost:3306/schoolproject ;Dl< GW3<  
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<property name="connection.useUnicode">true</property> SSi-Z  
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<property name="hibernate.c3p0.max_size">20</property> \Qa6mt2h  
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<property name="hibernate.c3p0.timeout">120</property> JN5<=x5r  
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<property name="hibernate.c3p0.max_statements">100</property> 7nh,j <~;2  
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<property name="hibernate.c3p0.idle_test_period">120</property> .(!> *ka|  
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<property name="hibernate.c3p0.acquire_increment">2</property> q%HT)^F9oO  
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3．proxool连接池 Fv n:V\eb  
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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 y(M
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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 XCU.tWR:  
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收,超时的销毁--> ra\Moy  
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<maximum-new-connections>20</maximum-new-connections> .uzg2Kd_  
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等待请求数由maximum-new-connections决定--> mIVnc`3s  
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(2)配置hibernate.cfg.xml文件 $Gb] K{e  
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<property name="hibernate.proxool.pool_alias">DBPool</property> !cnunLc`  
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(1) hibernate.connection.provider_class定义Hibernate的连接加载类，这里Proxool连接池是用这个，不同的连接池有不同的加载类，可以查阅Hibernate文档获取相关信息
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(2) hibernate.proxool.pool_alias这里就是用我们上面提到的连接池的别名 2D`@$)KL  
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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。 )c5M;/s  
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(4) dialect是声明ＳＱＬ语句的方言 RL |.y~  
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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。 yCkfAx8]  
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(6) <mapping >资源文件映射 qC?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： s<'^ @Y  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 yXS ~PG  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect o%X_V!B{V