hibernate连接池

1．Hibernate默认连接池 4^K<RSYs  
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<!DOCTYPE hibernate-configuration ;TCT%j`^o  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" /~_,p,:aP  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> 4w(#`'I>  
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<property name="connection.url"> m7.6;k.  
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jdbc:mysql://localhost:3306/schoolproject )\fLS d  
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<property name="connection.useUnicode">true</property> U<.,"`=l  
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<property name="connection.characterEncoding">UTF-8</property> (b;*8  
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<property name="connection.username">root</property> -gy@sSfvkv  
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<property name="connection.password"></property>  j#YPo  
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<property name="show_sql">true</property> 45$FcK  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> 0iTh |K0  
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<!--映射Student这个资源--> >m4Q*a4M  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> fFJu]  
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2．C3P0连接配置 NX9K
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" Eu1t*>ZL  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> UTR`jXC
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<property name="connection.url"> )H|cri~D  
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jdbc:mysql://localhost:3306/schoolproject e]q(fPK  
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<property name="connection.useUnicode">true</property> $fFh4O4  
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<property name="connection.characterEncoding">UTF-8</property> 8qWN~Gk1p{  
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<!-- C3P0连接池设定--> gUHx(Fi[4  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider @e:= D  
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<property name="hibernate.c3p0.max_size">20</property> G;Py%8  
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<property name="hibernate.c3p0.min_size">5</property> r}i}4
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<property name="hibernate.c3p0.timeout">120</property> 8~ wP?  
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<property name="hibernate.c3p0.max_statements">100</property> k<}
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<property name="hibernate.c3p0.idle_test_period">120</property> P87Lo
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<property name="hibernate.c3p0.acquire_increment">2</property> }BI|M_q.1~  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> za!8:(  
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3．proxool连接池 .t7ME{  
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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 ?&?5x%|.<  
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Anything outside the "proxool" tag is ignored. --> b3Qk;yz  
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<alias>DBPool</alias> ]=ADX}  
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<driver-url> 0D Lw  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 ,b4o
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<driver-class>com.mysql.jdbc.Driver</driver-class>  &Ufp8[  
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<driver-properties> .N7<bt@~)  
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<property name="user" value="root"/> >gDeuye  
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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 67XUhnE  
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收,超时的销毁--> C]Y%dQh+a  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> cy
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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 bp<,Xfl  
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用户连接就不会被接受--> 5|cRHM#  
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<maximum-new-connections>20</maximum-new-connections> Zrp-Hv27,,  
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<prototype-count>5</prototype-count> c8Q}m(bhWI  
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等待请求数由maximum-new-connections决定--> bYoBJ #UX  
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(2)配置hibernate.cfg.xml文件 C<3<,~gI  
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<property name="hibernate.connection.provider_class"> @aZTx/  
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<property name="hibernate.proxool.pool_alias">DBPool</property> (nt`8 0  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> CDRbYO  
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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 5]N0p,f  
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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 :rVR{,pL  
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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。 Q+T#J9Y  
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(4) dialect是声明ＳＱＬ语句的方言 OuTV
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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。 e$Ds2%SaT  
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(6) <mapping >资源文件映射 "/aZ*mkjfJ  
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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： O8@65URKx  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 ]`&_!T  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory q!z"YpYB  
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hibernate.transaction.manager_loopup_class = xz8e1M  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect 0+FPAqX