hibernate连接池

1．Hibernate默认连接池 yxa~Rz/  
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<?xml version='1.0' encoding='UTF-8'?> J12ZdC'O  
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<!DOCTYPE hibernate-configuration k98}Jx7J)"  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" lAwOp  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> 2Ax HhD.  
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<property name="connection.url"> P~0d'Oi  
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jdbc:mysql://localhost:3306/schoolproject {O,Cc$_  
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<property name="connection.useUnicode">true</property> PaEsz$mgy  
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<property name="connection.characterEncoding">UTF-8</property> wo[W1?|s  
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<property name="connection.username">root</property> d+|8({X]D8  
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<property name="show_sql">true</property> u+zq:2)H6  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> UJ)\E ^Hp  
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<!--映射Student这个资源--> S&V5zB""n  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> oj<.axA,  
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</session-factory> COj50t/  
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2．C3P0连接配置 3u7E?*{sH  
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<!DOCTYPE hibernate-configuration k-T_,1l{  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" W?'!}g(~  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> T |'Ur#  
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<property name="connection.url"> 9))%tYN  
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jdbc:mysql://localhost:3306/schoolproject VPn#O  
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<property name="connection.useUnicode">true</property> eJ%~6c`@!  
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<property name="connection.characterEncoding">UTF-8</property> [gzw<b:`  
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<property name="connection.username">root</property> q&Q* gEFK  
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<!-- C3P0连接池设定--> \E?1bc{\f  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider ;b cy(Fp,\  
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<property name="hibernate.c3p0.max_size">20</property> xYM/{[  
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<property name="hibernate.c3p0.min_size">5</property> i3;Z:,A4NN  
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<property name="hibernate.c3p0.timeout">120</property> f5wOk&G  
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<property name="hibernate.c3p0.max_statements">100</property> %'4dgk  
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<property name="hibernate.c3p0.idle_test_period">120</property> PM=I
 
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<property name="hibernate.c3p0.acquire_increment">2</property> l%fnGe` _  
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<property name="show_sql">true</property> *M+:GH/5  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> #hR}7K+@  
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</hibernate-configuration> S:rW}rJ  
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3．proxool连接池 ,W*<e-  
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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 H -.3r  
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<!-- the proxool configuration can be embedded within your own application's. Qf>dfJ^q  
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Anything outside the "proxool" tag is ignored. --> !c(B^E  
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<proxool> {v;Y}o-p  
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<alias>DBPool</alias> *RxbqB-  
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<!--proxool只能管理由自己产生的连接--> /wCP(1Mw  
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<driver-url> .~W7{SY[  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 3@ay9!Xq  
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<driver-class>com.mysql.jdbc.Driver</driver-class> qMI%=@=  
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<driver-properties> iCl,7$[*  
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<property name="user" value="root"/> ?1OS%RBF  
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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 I"T_<  
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收,超时的销毁--> RMLs(?e  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> Z[0xqGYLB  
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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 YEVH?`G  
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用户连接就不会被接受--> lD !^MqK  
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<maximum-new-connections>20</maximum-new-connections> x8zUGvtQ  
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等待请求数由maximum-new-connections决定--> GW`9SB  
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<maximum-connection-count>100</maximum-connection-count> AbLOq@lrK  
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<minimum-connection-count>10</minimum-connection-count> #p=/P{*  
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(2)配置hibernate.cfg.xml文件 &#;UKk~)Of  
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<property name="hibernate.connection.provider_class"> JBi<TDm/  
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<property name="hibernate.proxool.pool_alias">DBPool</property> +a"Asvw2  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> VEo>uR  
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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 YNHn# 98\  
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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 C4TJS,!1rH  
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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。 Y -
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(4) dialect是声明ＳＱＬ语句的方言 D3(|bSca  
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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。 OUnt?[U\  
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(6) <mapping >资源文件映射 r3_@ L
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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： `3/,-  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 mS&[<[x  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory q8P| ]  
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hibernate.transaction.manager_loopup_class = F+*: >@3  
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