hibernate连接池

1．Hibernate默认连接池 H$2<N@'4z  
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<?xml version='1.0' encoding='UTF-8'?> ttlFb]zZh  
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<!DOCTYPE hibernate-configuration _tJp@\rOz=  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" R pUq#Y:a  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> O,m0Xb2s]~  
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<property name="connection.url"> ^Ec);Z  
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jdbc:mysql://localhost:3306/schoolproject t= =+SHGP  
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<property name="connection.useUnicode">true</property> q~QB?+ x&  
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<property name="connection.characterEncoding">UTF-8</property> sFhmp  
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<property name="connection.username">root</property> Tf[o'=2  
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<property name="connection.password"></property> "Dr8}g:X  
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<property name="show_sql">true</property> KmUH([#  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> re\pE2&B  
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2．C3P0连接配置 )?L  
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<!DOCTYPE hibernate-configuration "9>.,nzt  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" m]XG7:}V0  
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"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> )HaW# ,XB  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> Ms * `w5n  
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<property name="connection.url"> wO>P<KBU  
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jdbc:mysql://localhost:3306/schoolproject RxeyMNd  
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<property name="connection.useUnicode">true</property> XkGS3EY  
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<property name="connection.characterEncoding">UTF-8</property> #YEOY#  
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<property name="connection.username">root</property> =.<S3?  
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<property name="connection.password"></property> ?H30  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider AbXaxt/[g?  
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<property name="hibernate.c3p0.max_size">20</property> ,sk0){rW  
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<property name="hibernate.c3p0.min_size">5</property> .#BWu(EYV  
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<property name="hibernate.c3p0.timeout">120</property> E <O:  
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<property name="hibernate.c3p0.max_statements">100</property> I"_``*/1  
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<property name="hibernate.c3p0.idle_test_period">120</property> jO5R0^w  
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<property name="hibernate.c3p0.acquire_increment">2</property> ^y1P~4w?  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> <}vult^  
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3．proxool连接池 CnvM>]  
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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 L{i,.aE/nO  
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Anything outside the "proxool" tag is ignored. --> <-3_tu>l  
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<proxool> hG8!aJo  
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<alias>DBPool</alias> I8%2tLVY  
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<driver-url> ([+u U!  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 u6pfc'GGg  
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<driver-class>com.mysql.jdbc.Driver</driver-class>  6[{|'  
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<driver-properties> IeZgF>  
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<property name="user" value="root"/> B,f4<  
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<property name="password" value=""/> OZ'=Xtbn  
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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 x_yQoae  
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收,超时的销毁--> "G+g(?N]j  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> \TF='@u.  
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用户连接就不会被接受--> 6H)T=Z|  
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<maximum-new-connections>20</maximum-new-connections> j\o<r0I  
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<prototype-count>5</prototype-count> Q=+*OQV29  
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等待请求数由maximum-new-connections决定--> &ml7368@  
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<maximum-connection-count>100</maximum-connection-count> V2&O]bR  
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<minimum-connection-count>10</minimum-connection-count> k/hD2tBLu  
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(2)配置hibernate.cfg.xml文件 g$(<wWsU  
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<hibernate-configuration> )yOdRRP  
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<property name="hibernate.connection.provider_class"> 323zR*\m  
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org.hibernate.connection.ProxoolConnectionProvider d&@>P&AT  
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<property name="hibernate.proxool.pool_alias">DBPool</property> gq'}LcV  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> E/OJ}3Rf  
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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 [32]wgw+{1  
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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 3k#?E]'  
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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。 TIs~?wb$  
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(4) dialect是声明ＳＱＬ语句的方言 DaA9fJ7a   
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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。 D.Q9fa&P  
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(6) <mapping >资源文件映射 p}b:(QN~m  
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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： \o&\r)FX  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 pd3=^Zi  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory ?$ft3p}  
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hibernate.transaction.manager_loopup_class = ?
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hibernate.dialect=org.hibernate.dialect.MySQLDialect 'aWrjfD
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