hibernate连接池

1．Hibernate默认连接池 S7hfwu&7F  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> 0k|/]zfb  
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<!-- 连接数据库的URL--> SYK?5_804  
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<property name="connection.url"> xJ|Z]m=d   
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jdbc:mysql://localhost:3306/schoolproject TGPHjSZ1  
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<property name="connection.useUnicode">true</property> =~QC)y_  
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<property name="connection.username">root</property> X1h*.reFAL  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> o!t1EPJE*  
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2．C3P0连接配置 RJI*ZNbA  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> dfq5P!'  
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<property name="connection.url"> ZvO:!u0+"  
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jdbc:mysql://localhost:3306/schoolproject BPd]L=,/  
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<property name="connection.useUnicode">true</property> wB( igPi  
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<!-- C3P0连接池设定--> WiviH#hF  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider #PA"l`"  
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<property name="hibernate.c3p0.max_size">20</property> ]@ [=FK^  
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<property name="hibernate.c3p0.min_size">5</property> 
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<property name="hibernate.c3p0.timeout">120</property> )-a_,3x%j  
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<property name="hibernate.c3p0.max_statements">100</property> &:jE+l  
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<property name="hibernate.c3p0.idle_test_period">120</property> M3F8@|2  
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<property name="hibernate.c3p0.acquire_increment">2</property> a3lo;Cfp  
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3．proxool连接池 >I
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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 f@/qW!o
 
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<alias>DBPool</alias> JWn{nJ$]  
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<driver-properties> #<e7 Y0  
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<property name="user" value="root"/> 

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收,超时的销毁--> 4a|Fx  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> Om"3Q/&  
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<maximum-new-connections>20</maximum-new-connections> 5gEfhZQ  
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<prototype-count>5</prototype-count> L# 1vf  
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等待请求数由maximum-new-connections决定--> n1>nnH]G  
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(2)配置hibernate.cfg.xml文件 y(  
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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 _=*tDa  
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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 MhI)7jj`mt  
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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。 )
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(4) dialect是声明ＳＱＬ语句的方言 Dp*$GQ  
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(5) show_sql定义是否显示Hibernate生成的ＳＱＬ语言，一般在调试阶段设为true,完成后再改成false，这样有利于调试。 %FyygTb;S  
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(6) <mapping >资源文件映射 zYG,x*IH  
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4． JNDI连接池，数据源已经由应用服务配置好(如Web服务器)，Hibernate需要做的只是通过JNDI名查找到此数据源。应用服务器将连接池对外显示为JNDI绑定数据源，它是javax.jdbc.Datasource类的一个实例。只要配置一个Hibernate文件，如： #>:(#^Uu  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 y /:T(tk$  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory L=HVdeE  
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hibernate.transaction.manager_loopup_class = MFH"$t+  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect G4`Ut1g^