hibernate连接池

1．Hibernate默认连接池 x>`%DwoRI  
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<?xml version='1.0' encoding='UTF-8'?> (n9gkO&8"  
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<!DOCTYPE hibernate-configuration qR+!l(  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" }s<4{:cv+  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> e|WJQd4+S  
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<!-- 连接数据库的URL--> R>mmoG}MQ[  
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<property name="connection.url"> AvV|(K"  
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jdbc:mysql://localhost:3306/schoolproject xCl1g4N  
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</property> cI?8RF(;  
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<property name="connection.useUnicode">true</property> r{I% \R!@  
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<property name="connection.username">root</property> c*L\_Vx+  
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<!--是否将运行期生成的SQL输出到日志以供调试--> ?3zc=J"t  
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<property name="show_sql">true</property> dS!:JO27  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> >\=3:gb:  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> 3|4|*6  
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2．C3P0连接配置 rrqR}}l  
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<!DOCTYPE hibernate-configuration w?wG(+X7  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" m)v"3ib  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> ^xHTWg%9  
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<property name="connection.url"> 0]=i}wL 8  
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jdbc:mysql://localhost:3306/schoolproject =aj/,Q]  
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<property name="connection.useUnicode">true</property> sz {
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<!-- C3P0连接池设定--> &f^l^K5:  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider y^Kph# F"  
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<property name="hibernate.c3p0.max_size">20</property> @@rEs40  
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<property name="hibernate.c3p0.min_size">5</property> <Ib[82PU  
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<property name="hibernate.c3p0.timeout">120</property> J9Ou+6u(  
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<property name="hibernate.c3p0.max_statements">100</property> ivz>dJ?T  
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<property name="hibernate.c3p0.idle_test_period">120</property> =;|QZ"%E  
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<property name="hibernate.c3p0.acquire_increment">2</property> MR,R}B$  
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3．proxool连接池 'snn~{hG  
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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 KkMay  
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<!-- the proxool configuration can be embedded within your own application's. J3b4cxm  
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Anything outside the "proxool" tag is ignored. --> ;t>Z+O%  
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<proxool> }o,z!_^PLQ  
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<alias>DBPool</alias> ^D_/=4rz8  
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<!--proxool只能管理由自己产生的连接--> ;#)mLsl  
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<property name="user" value="root"/> -,":5V26  
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收,超时的销毁--> _2mNTJi
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> lg:y|@Y''  
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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 P-JfV7(O8  
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<maximum-new-connections>20</maximum-new-connections> q:HoKJv4  
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等待请求数由maximum-new-connections决定--> ,bSVVT-b  
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(2)配置hibernate.cfg.xml文件 wd`R4CKhP]  
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<property name="hibernate.proxool.pool_alias">DBPool</property> n1`T#%e  
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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 %G^(T%q| m  
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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 olslzXn7o  
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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。 X$ejy/+.  
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(4) dialect是声明ＳＱＬ语句的方言 CJtr0M<U+  
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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。 la1D2 lM  
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(6) <mapping >资源文件映射 {m>~`   
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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： }b<87#Nb9R  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 wZ}n3R,   
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory dW:w<{a!R  
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hibernate.transaction.manager_loopup_class = _-YL!oP  
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