hibernate连接池

1．Hibernate默认连接池 wx^Det  
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<!DOCTYPE hibernate-configuration HjIIhl?UY  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> qCg<
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<property name="connection.url"> 8T1zL.u>q  
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jdbc:mysql://localhost:3306/schoolproject vn+XY=Qnr  
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<property name="connection.useUnicode">true</property> }/dk2!?ig  
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<property name="connection.characterEncoding">UTF-8</property> 5CZyA`3V^5  
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<property name="connection.username">root</property> ;+<IWDo  
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<property name="connection.password"></property> n1J u=C  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> TY)QE  
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2．C3P0连接配置 Jqj!k*=/  
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<!DOCTYPE hibernate-configuration ^1najUpQ_n  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" >\d&LLAe  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> E`.xu>Yyj  
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<property name="connection.url"> VHxBs  
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jdbc:mysql://localhost:3306/schoolproject ( zWBrCX  
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<property name="connection.useUnicode">true</property> krUtOVI  
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<property name="connection.characterEncoding">UTF-8</property> <rBW6o7  
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<property name="connection.username">root</property> ,^:{!?v  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider Q;]JVT1  
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<property name="hibernate.c3p0.max_size">20</property> pF{jIXu  
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<property name="hibernate.c3p0.min_size">5</property> C[L 5H  
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<property name="hibernate.c3p0.timeout">120</property> EhxpMTS  
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<property name="hibernate.c3p0.max_statements">100</property> 1Gsh%0r3  
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<property name="hibernate.c3p0.idle_test_period">120</property> k+J%o%* <  
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<property name="hibernate.c3p0.acquire_increment">2</property> KN}#8.'>3  
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3．proxool连接池 >V"{]v  
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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 //&3{B  
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Anything outside the "proxool" tag is ignored. --> &]TniQH  
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<proxool> Ichg,d-M-K  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 bc(MN8b]j  
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<driver-properties> fM.#FT??  
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<property name="user" value="root"/> oXZWg~&l^  
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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 !$NK7-  
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收,超时的销毁--> ^li3*#eT  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> F:jNv3W1  
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用户连接就不会被接受--> y{M7kYWtHV  
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<maximum-new-connections>20</maximum-new-connections> {+lU4u  
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等待请求数由maximum-new-connections决定--> v{$?Ow T/u  
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<maximum-connection-count>100</maximum-connection-count> sSh." H  
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<minimum-connection-count>10</minimum-connection-count> T 9`AL  
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(2)配置hibernate.cfg.xml文件 +wz1kPRs  
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<!DOCTYPE hibernate-configuration :YRHO|  
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<property name="hibernate.connection.provider_class"> $aEv*{$y  
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<property name="hibernate.proxool.pool_alias">DBPool</property> 5nBJj  
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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 6q'Q?Uw^  
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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 LKI\(%ba#  
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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;|9?O  
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(4) dialect是声明ＳＱＬ语句的方言 -0q|AB<  
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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。 mzM95yQ^Z  
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(6) <mapping >资源文件映射 .]KC*2  
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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： i)(G0/:  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 IEm~^D#<=  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory Q_fgpjEh/t  
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hibernate.transaction.manager_loopup_class = Op9 ^Eu%n  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect xc@$z*w