hibernate连接池

1．Hibernate默认连接池 3*T/ 7\  
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<!DOCTYPE hibernate-configuration d\R "?Sg  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" l)e6*sDZ,  
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<session-factory > HVdB*QEH  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> <Mndr8 H  
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<!-- 连接数据库的URL--> s",
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<property name="connection.url"> ]XcWGQv~  
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jdbc:mysql://localhost:3306/schoolproject ?
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<property name="connection.useUnicode">true</property> ly69:TR7I  
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<property name="connection.characterEncoding">UTF-8</property> uaYI3w@^  
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<!--连接的登录名--> DQ}&J  
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<property name="connection.username">root</property> n!sOKw  
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<property name="connection.password"></property> g\9&L/xDN  
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<!--是否将运行期生成的SQL输出到日志以供调试--> Lxn-M5RPQ  
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<property name="show_sql">true</property> S'`G7ht  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> AHMvh 7O?  
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<!--映射Student这个资源--> >sdF:(JV&  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> *%\Xw*\0  
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</session-factory> &G[W$2`@  
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2．C3P0连接配置 ~.6% %1?  
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<!DOCTYPE hibernate-configuration {t4':{Y+  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" xXnSo0`LF  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> APJFy@l}  
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<!-- 连接数据库的URL--> DZ $O%  
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<property name="connection.url"> asE.!g?  
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jdbc:mysql://localhost:3306/schoolproject fh66Gn,  
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<property name="connection.useUnicode">true</property> |Om9(xT  
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<property name="connection.characterEncoding">UTF-8</property> 6-\' *5r  
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<property name="connection.username">root</property> @HE?G  
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<!-- C3P0连接池设定--> **oDQwW]*  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider DGw*
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<property name="hibernate.c3p0.max_size">20</property> c>! ^\  
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<property name="hibernate.c3p0.min_size">5</property> !aJ6Uf%R  
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<property name="hibernate.c3p0.timeout">120</property> 0-uVmlk=/  
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<property name="hibernate.c3p0.max_statements">100</property> |oePB<N  
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<property name="hibernate.c3p0.idle_test_period">120</property> sPl3JP&s  
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<property name="hibernate.c3p0.acquire_increment">2</property> h0A
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> b2j~"9  
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3．proxool连接池 <K>qK]|C  
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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 v`Ja Bn  
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<!-- the proxool configuration can be embedded within your own application's. jfam/LL{V  
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Anything outside the "proxool" tag is ignored. --> r;>.*60AT  
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<proxool> Zw<<p|{)<  
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<alias>DBPool</alias> axK/YE7t  
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<driver-url> ",
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 `_]UlI_h  
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<driver-class>com.mysql.jdbc.Driver</driver-class> MlW*Tugg  
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<driver-properties> >McEuoZx9  
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<property name="user" value="root"/> ov >5+"q)  
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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 &^Gp  
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收,超时的销毁--> <,U$Y>  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> .*J /F$  
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<maximum-new-connections>20</maximum-new-connections> hZ"Sqm]  
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等待请求数由maximum-new-connections决定--> IA`Lp3Z  
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<maximum-connection-count>100</maximum-connection-count> nUisC5HW  
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<minimum-connection-count>10</minimum-connection-count> <|w(Sn  
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(2)配置hibernate.cfg.xml文件 dQ
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<hibernate-configuration> Q{yjIy/b  
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<property name="hibernate.connection.provider_class"> t6lwKK  
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org.hibernate.connection.ProxoolConnectionProvider M5L/3qLh1  
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<property name="hibernate.proxool.pool_alias">DBPool</property> MIb[}w=  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> KKWvV4u  
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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 |=MhI5gsx  
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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 5L_`Fw\l  
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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。 "\=Phqw   
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(4) dialect是声明ＳＱＬ语句的方言 PC|ul{[*}  
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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。 bZ``*{I/  
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(6) <mapping >资源文件映射 PTqia!  
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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： k+vfZ9bD(J  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 ga(k2Q;y  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory yc`*zLWh  
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hibernate.transaction.manager_loopup_class = +-,iC
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org.hibernate.transaction.JBossTransactionManagerLookup euVj,m  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect iq[IZdza