hibernate连接池

1．Hibernate默认连接池 ps^Z)x`GV  
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<?xml version='1.0' encoding='UTF-8'?> xLX:>64'o>  
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<!DOCTYPE hibernate-configuration ' !ZFK}  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" 2wpLP^9Vr<  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> BbnY9"  
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<property name="connection.url"> oX8e}  
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jdbc:mysql://localhost:3306/schoolproject XSkx<"U*  
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<property name="connection.useUnicode">true</property> c>,|[zP{  
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<property name="connection.characterEncoding">UTF-8</property> i9 8T+{4  
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<property name="connection.username">root</property> ]Wa.k  
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<property name="connection.password"></property> q$Gf9&ZO  
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<property name="show_sql">true</property> tg_v\n  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> Yg3Vj=  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> B{hP#bYK  
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</session-factory> ^rO3B?_  
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2．C3P0连接配置 uQIa"u7  
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<!DOCTYPE hibernate-configuration ;'CWAJK  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" V<A_c^unO  
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"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> ;4tmnC>OnA  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> G9"2h \  
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<!-- 连接数据库的URL--> XaOq&7  
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<property name="connection.url"> Ss ;C1:  
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jdbc:mysql://localhost:3306/schoolproject ZU\TA|  
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<property name="connection.useUnicode">true</property> j{PuZ^v1  
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<property name="connection.username">root</property> H~y 7o_tg  
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<!-- C3P0连接池设定--> M8j%bmd(,  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider X$z@ *3=  
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<property name="hibernate.c3p0.max_size">20</property> gQHE2$i>  
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<property name="hibernate.c3p0.min_size">5</property> ,2h
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<property name="hibernate.c3p0.timeout">120</property> (5AgI7I,  
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<property name="hibernate.c3p0.max_statements">100</property>
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<property name="hibernate.c3p0.idle_test_period">120</property> cu&tdg^q  
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<property name="hibernate.c3p0.acquire_increment">2</property> 'U=D6X%V9m  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> erG@8CG  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> i^hgs`hvU  
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</session-factory> ZUE?19GA  
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3．proxool连接池 _Se~bkw?v  
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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 etbB;!6  
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Anything outside the "proxool" tag is ignored. --> q!l[^t|;  
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<alias>DBPool</alias> |Tz/9t  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 B@wQ[  
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<driver-class>com.mysql.jdbc.Driver</driver-class> Dim,HPx]d  
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<property name="user" value="root"/> #vN\]e  
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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 c9e 
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收,超时的销毁--> h[d|y_)f  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> +M9=KVr  
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用户连接就不会被接受--> }-
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<maximum-new-connections>20</maximum-new-connections> \IQP`JR  
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<!-- 最少保持的空闲连接数--> e=nExY  
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等待请求数由maximum-new-connections决定--> 5Am*1S^  
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<minimum-connection-count>10</minimum-connection-count> ^r=#HQGt  
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(2)配置hibernate.cfg.xml文件 6X5m1+ Oi^  
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<!DOCTYPE hibernate-configuration ^sH1YE}0  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" (JFa  
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<property name="hibernate.connection.provider_class"> C%#C|X193  
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org.hibernate.connection.ProxoolConnectionProvider {NE;z<,*:  
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<property name="hibernate.proxool.pool_alias">DBPool</property> n<yV]i$  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> Q}]:lmqH  
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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 :CHCVoh@95  
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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 @zfeCxVOA  
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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。 r(vk2Qy  
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(4) dialect是声明ＳＱＬ语句的方言 WKxJ`r\  
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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。 ?WUE+(oH>  
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(6) <mapping >资源文件映射 4B]8Mp~\aL  
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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： m/Yi;>I(  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 GUat~[lUrj  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory vn}Vb+@R  
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hibernate.transaction.manager_loopup_class = JpS:}yyJ>N  
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