hibernate连接池

1．Hibernate默认连接池 .Ap-<FB  
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<?xml version='1.0' encoding='UTF-8'?> >AsD6]   
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<!DOCTYPE hibernate-configuration `oP<mLxle  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> q[4{Xh  
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<property name="connection.url"> '>[l1<d!G  
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<property name="connection.useUnicode">true</property> FQdz":5  
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<property name="connection.characterEncoding">UTF-8</property> DSGtt/n  
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<property name="connection.username">root</property> ;V(- ;O  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> W7I.S5  
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2．C3P0连接配置 gycjIy@t  
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<property name="connection.url"> o+UCu`7e  
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jdbc:mysql://localhost:3306/schoolproject Ore>j+  
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<property name="connection.useUnicode">true</property> &)UZ9r`z  
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<property name="hibernate.c3p0.max_size">20</property> WiDl[l"{9  
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<property name="hibernate.c3p0.min_size">5</property> #G</RYM~m  
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<property name="hibernate.c3p0.timeout">120</property> [k1N-';;;  
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<property name="hibernate.c3p0.max_statements">100</property> m9yi:zT%  
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<property name="hibernate.c3p0.idle_test_period">120</property> EPEy60Rx5  
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<property name="hibernate.c3p0.acquire_increment">2</property> Q]44A+
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3．proxool连接池 /Pbytu);ds  
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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 m!22t
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 'c&[kMR  
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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 BS.5g<E2q  
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收,超时的销毁--> uIy$|N  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> LULRi#n  
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用户连接就不会被接受--> /n2qW.qJ>  
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等待请求数由maximum-new-connections决定--> WK.K-bd  
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(2)配置hibernate.cfg.xml文件 uhm3}mWv  
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<property name="hibernate.proxool.pool_alias">DBPool</property> =PjxMC._  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> `n"PHur  
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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 k#-%u,t  
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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 {(l,Uhxl""  
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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。 (v&iXD5t  
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(4) dialect是声明ＳＱＬ语句的方言 !xU[BCbfYV  
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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。 !8YA1 o  
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(6) <mapping >资源文件映射 _K B%g_{  
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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： =imJ0V~RW  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 Z^J7r&\V  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory BZ(DP_}&D  
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hibernate.transaction.manager_loopup_class = ZcN#jnb0/  
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