hibernate连接池

1．Hibernate默认连接池 bAqA1y3=  
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<!DOCTYPE hibernate-configuration Yj49
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" M%m4i9~!?  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> oMa6(3T?E  
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<!-- 连接数据库的URL--> 73;GW4,  
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<property name="connection.url"> Xx:"4l.w.  
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jdbc:mysql://localhost:3306/schoolproject $U~]=.n  
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<property name="connection.useUnicode">true</property> /U9"wvg  
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<property name="connection.characterEncoding">UTF-8</property> ;.980+i1  
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<property name="connection.username">root</property> H.MI5O(Q  
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<property name="connection.password"></property> ?UoBV$  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> +M/%+l  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> #H~64/  
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</session-factory> y:uE3Apm  
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2．C3P0连接配置 f!X[c?Xy"  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" ~k5W@`"W  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> >H,*H;6  
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<property name="connection.url"> U6s[`H3I{  
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jdbc:mysql://localhost:3306/schoolproject xT2PyI_:  
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<property name="connection.useUnicode">true</property> \_fv7Fdp{  
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<property name="connection.characterEncoding">UTF-8</property> dAj$1Ke  
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<property name="connection.password"></property> 4B][S'f  
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<!-- C3P0连接池设定--> kG*~|ma  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider / XIhj  
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<property name="hibernate.c3p0.max_size">20</property> Y<8vw d  
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<property name="hibernate.c3p0.min_size">5</property> U/BR*Zn]*  
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<property name="hibernate.c3p0.timeout">120</property> zx7{U8*`<  
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<property name="hibernate.c3p0.max_statements">100</property> 5kXYeP3:  
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<property name="hibernate.c3p0.idle_test_period">120</property> Rlirs-WQ  
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<property name="hibernate.c3p0.acquire_increment">2</property> ct}9i"H#1  
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3．proxool连接池 3oG,E;(  
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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 &iVs0R  
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<?xml version="1.0" encoding="UTF-8"?> C{wEzM:  
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Anything outside the "proxool" tag is ignored. --> ;6hOx(>`=  
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<proxool> YT8F#t8  
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<alias>DBPool</alias> gv{ >`AN  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 S>; 5[l 4  
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<!?JDBC驱动程序-->
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<driver-class>com.mysql.jdbc.Driver</driver-class> O%HHYV%[m  
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<driver-properties>
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<property name="user" value="root"/> t<?,F  
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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 ^L&iR0  
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收,超时的销毁--> K,:N  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> '>C5-R:O  
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<maximum-new-connections>20</maximum-new-connections> =zs`#-^8  
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等待请求数由maximum-new-connections决定--> Tc3yS(aq  
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<minimum-connection-count>10</minimum-connection-count> D*|Bb?  
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(2)配置hibernate.cfg.xml文件 Q#[9|A9  
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<property name="hibernate.connection.provider_class"> #|PS&}6wU  
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<property name="hibernate.proxool.pool_alias">DBPool</property> 5iydZ  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> Czu\RXJR  
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<property name="show_sql">true</property> _[ZO p ~  
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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 a]tVd#  
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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,)G5&  
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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。 HcSXsF  
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(4) dialect是声明ＳＱＬ语句的方言 ,0HRAmG  
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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。 nq8C'Fo!6T  
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(6) <mapping >资源文件映射 hJ~Uf5Q  
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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： >y:,9;  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 VrQmP  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory q\p:X"j|  
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hibernate.transaction.manager_loopup_class = ILShd)]Rw  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect !6>~?gNd