hibernate连接池

1．Hibernate默认连接池 "/?*F\5  
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<?xml version='1.0' encoding='UTF-8'?> ?Ib/}JST  
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<!DOCTYPE hibernate-configuration V|.aud=7z  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" zY|]bP[NEH  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> l#o43xr  
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<property name="connection.url"> )
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jdbc:mysql://localhost:3306/schoolproject q'2PG@  
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<property name="connection.useUnicode">true</property> vO{ijHKE  
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<property name="connection.characterEncoding">UTF-8</property> VJCh5t*  
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<property name="connection.username">root</property> '{cN~A2b4  
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<property name="connection.password"></property> &,."=G  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> Pz|qy,  
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2．C3P0连接配置 &vMH AZd  
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<!DOCTYPE hibernate-configuration lIFt/  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> xu:m~8%  
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<property name="connection.url"> $k`8Zx w  
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jdbc:mysql://localhost:3306/schoolproject /M3D[aR<d  
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<property name="connection.useUnicode">true</property> p_z"Uwp  
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<property name="connection.characterEncoding">UTF-8</property> zDl, bLiJ  
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<property name="connection.username">root</property> H*\[:tPa  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider wi9|  
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<property name="hibernate.c3p0.max_size">20</property> t3GK{X  
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<property name="hibernate.c3p0.min_size">5</property> 4jz]c"p-  
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<property name="hibernate.c3p0.timeout">120</property> iCK$ o_`?  
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<property name="hibernate.c3p0.max_statements">100</property> x5|v# -F ^  
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<property name="hibernate.c3p0.idle_test_period">120</property> vUK>4^{J5  
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<property name="hibernate.c3p0.acquire_increment">2</property> v$i%>tQ\  
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3．proxool连接池 !5OMAWNU@  
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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 ]2%P``Yj  
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Anything outside the "proxool" tag is ignored. --> G r|@CZq  
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<alias>DBPool</alias> ^X;Xti  
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<driver-url> U9o*6`"o  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 DsW`V~T  
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<driver-class>com.mysql.jdbc.Driver</driver-class> 6+;2B<II  
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<driver-properties> !-RpRRR[Co  
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<property name="user" value="root"/> Mto~ /  
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收,超时的销毁--> q AVfbcb  
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用户连接就不会被接受--> iRwW>a3/  
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<maximum-new-connections>20</maximum-new-connections> :IT U0%;!+  
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<prototype-count>5</prototype-count> Go+xL/f  
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等待请求数由maximum-new-connections决定--> 9MtJo.A  
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<maximum-connection-count>100</maximum-connection-count> {8Jk=)(md  
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<minimum-connection-count>10</minimum-connection-count> svq9@!go  
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(2)配置hibernate.cfg.xml文件 28Ssb|  
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<property name="hibernate.connection.provider_class"> LG Y!j_bD  
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<property name="hibernate.proxool.pool_alias">DBPool</property> -lP )  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> y=oVUsG  
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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 JVUZ}#O  
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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 `N|U"s;  
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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。 7x[LF ^o  
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(4) dialect是声明ＳＱＬ语句的方言 ,>bGbx  
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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。 '!j #X_;  
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(6) <mapping >资源文件映射 ?qd,>  
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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： DEUd[  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 H4PbO/{xO  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory ;Pol#0_(  
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hibernate.transaction.manager_loopup_class = N_u&3CG  
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