hibernate连接池

1．Hibernate默认连接池 ~+H"
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<?xml version='1.0' encoding='UTF-8'?> >z%Q>(F  
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<!DOCTYPE hibernate-configuration `s]4AKBO  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" 'i8U  
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"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> 0vGyI>  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> hAqg Iu*  
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<!-- 连接数据库的URL--> k{AyD`'Q  
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<property name="connection.url"> \]Dt4o*yZ  
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<property name="connection.useUnicode">true</property> {C
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<property name="connection.characterEncoding">UTF-8</property> xAwf49N~  
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<property name="connection.username">root</property> n(lk dw  
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<property name="connection.password"></property> }4nT.!5  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> {5Eyr$  
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<!--映射Student这个资源--> L"rcv:QWZa  
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2．C3P0连接配置 h)E|?b_  
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<!DOCTYPE hibernate-configuration <{019Oa  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> Tiprdvm<  
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<property name="connection.url"> GEtbs+[  
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jdbc:mysql://localhost:3306/schoolproject IIaxgfhZ  
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<property name="connection.useUnicode">true</property> XTj73 MWY  
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<property name="connection.characterEncoding">UTF-8</property> hrT%XJl  
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<property name="connection.username">root</property> 7O461$4v  
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<property name="connection.password"></property> ,|iy1yg(  
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<!-- C3P0连接池设定--> A:c]1  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider UnjNR[=  
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<property name="hibernate.c3p0.max_size">20</property> YnD#p[Wo^  
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<property name="hibernate.c3p0.min_size">5</property> NGSS:  
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<property name="hibernate.c3p0.timeout">120</property> ;'hi9L  
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<property name="hibernate.c3p0.max_statements">100</property> 1wb
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<property name="hibernate.c3p0.idle_test_period">120</property> WT?bBf  
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<property name="hibernate.c3p0.acquire_increment">2</property> 8Yxhd .  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> n'ehB%"  
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3．proxool连接池 "$]ls9-%n  
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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 2ve lH;  
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Anything outside the "proxool" tag is ignored. --> (QhGxuC  
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<proxool> A<mj8qz  
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<alias>DBPool</alias> a3Z:C!|O'  
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<driver-url> zt-'SY  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 u+I3IdU3  
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<!?JDBC驱动程序--> Y8D7<V~Md  
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<driver-class>com.mysql.jdbc.Driver</driver-class> N|UBaPS|
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<driver-properties> >Y,/dyT Zm  
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<property name="user" value="root"/> 2=igS#h  
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收,超时的销毁--> Xy[4f=X}z  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> S1D9AcK  
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<!-- 指因未有空闲连接可以分配而在队列中等候的最大请求数,超过这个请求数的 hg%@W  
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用户连接就不会被接受--> )m|X;eEo  
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等待请求数由maximum-new-connections决定--> =$"zqa.B6  
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(2)配置hibernate.cfg.xml文件 r85Xa'hh  
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<property name="hibernate.connection.provider_class"> Ww'TCWk@  
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<property name="hibernate.proxool.pool_alias">DBPool</property> TzevC$m;z  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> ,IT)zCpaBP  
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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 ek{PA!9Sk  
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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 ?CUp&L0-"  
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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。 zFdz]z3  
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(4) dialect是声明ＳＱＬ语句的方言 :LIKp;  
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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。 Cj4b]*Q,  
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(6) <mapping >资源文件映射 vZ nO  
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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： %\{?(baOA  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 5k%N<e``  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory ,Y\4xg*`  
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hibernate.transaction.manager_loopup_class = S4:\`Lo-;  
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