hibernate连接池

1．Hibernate默认连接池 2av=W  
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<!DOCTYPE hibernate-configuration /fU-0a8  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" Fr2F&NN`D  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> 'a:';hU3f  
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<!-- 连接数据库的URL--> IIF <Zkpb  
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<property name="connection.url"> *r7%'K{C  
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jdbc:mysql://localhost:3306/schoolproject w$""])o,  
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<property name="connection.useUnicode">true</property> h8;H<Y;yQ  
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<property name="connection.characterEncoding">UTF-8</property> Pu'NSNT  
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<!--连接的登录名--> (nYGN$qC9  
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<property name="connection.username">root</property> }Nma %6PfV  
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<property name="connection.password"></property> 6y"T;.FAo  
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<!--指定连接的语言--> J~h9i=4<bF  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> dqi31e{*2\  
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2．C3P0连接配置 j!@,r^(  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> ?ea5k*#a  
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<property name="connection.url"> 7Oi<_b  
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jdbc:mysql://localhost:3306/schoolproject .g.glQ_~=  
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<property name="connection.useUnicode">true</property> {yMkd4v  
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<property name="connection.characterEncoding">UTF-8</property> wp@6RJ  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider "Q{7X[$$^  
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<property name="hibernate.c3p0.max_size">20</property> YDgG2hT/2  
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<property name="hibernate.c3p0.min_size">5</property> )[=C@U  
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<property name="hibernate.c3p0.timeout">120</property> GxE`z6%[  
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<property name="hibernate.c3p0.max_statements">100</property> %mOQIXr1s  
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<property name="hibernate.c3p0.idle_test_period">120</property> q~{O^,4S  
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<property name="hibernate.c3p0.acquire_increment">2</property> 52r\Q}v$  
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3．proxool连接池 SOS|3q_`  
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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 9zpOp-K6  
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Anything outside the "proxool" tag is ignored. --> JRDIGS_~  
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<alias>DBPool</alias> = @ 1{LF;  
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<driver-url> xBE}/F$45  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 nDz.61$[  
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<driver-class>com.mysql.jdbc.Driver</driver-class> /7WdG)'  
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<property name="user" value="root"/> w`F'loUEt  
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<!-- proxool自动侦察各个连接状态的时间间隔(毫秒),侦察到空闲的连接就马上回 0*KL*Gn  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> WA#y&  
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<maximum-new-connections>20</maximum-new-connections> x}uDW   
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<prototype-count>5</prototype-count> yL23Nqe  
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等待请求数由maximum-new-connections决定--> 
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<maximum-connection-count>100</maximum-connection-count> _lfS"ae  
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(2)配置hibernate.cfg.xml文件 Q'aVdJN,  
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<property name="hibernate.proxool.pool_alias">DBPool</property> 8]WcW/1r !  
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(1) hibernate.connection.provider_class定义Hibernate的连接加载类，这里Proxool连接池是用这个，不同的连接池有不同的加载类，可以查阅Hibernate文档获取相关信息 
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(2) hibernate.proxool.pool_alias这里就是用我们上面提到的连接池的别名 }L>0}H  
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(3) hibernate.proxool.xml是向Hibernate声明连接池的配置文件位置，可以用相对或绝对路径，用相对路径时要注意一定在要Path范围内！不然会抛出异常。 1z@{4)  
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(4) dialect是声明ＳＱＬ语句的方言 kM3#[#6$!  
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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。 m4G))||9Q  
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(6) <mapping >资源文件映射 cY.5z:7u~v  
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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： ^C;ULUn3  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 SI7r`'7A'  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory (_fovV=  
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hibernate.transaction.manager_loopup_class = 5zH_yZ@+  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect  `dIwBfg_