hibernate连接池

1．Hibernate默认连接池 ~'ovJ46tx  
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<?xml version='1.0' encoding='UTF-8'?> *G9;d0  
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<!DOCTYPE hibernate-configuration |:\h3M  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" KksbhN{AB  
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<hibernate-configuration> @t_<oOI2  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> (vY10W{  
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<!-- 连接数据库的URL--> ]|-y[iu  
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<property name="connection.url"> j#-74{Y$ J  
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jdbc:mysql://localhost:3306/schoolproject rP*?a~<  
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<property name="connection.useUnicode">true</property> Ar|_UV>Zf  
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<property name="connection.characterEncoding">UTF-8</property> aUd633  
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<property name="connection.username">root</property> >:Rc%ILym  
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<property name="connection.password"></property> ~x824xW  
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2．C3P0连接配置 ~fEgrF d  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> F:1w%#6av  
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<property name="connection.url"> >`SIB; &>j  
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jdbc:mysql://localhost:3306/schoolproject {+!m]-s  
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<property name="connection.useUnicode">true</property> wHvX|GwMv  
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<property name="connection.characterEncoding">UTF-8</property> *{/BPc0*  
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<property name="connection.username">root</property> @))PpE`co8  
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<!-- C3P0连接池设定--> Z.ky=vCt  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider IC"bg<L,*  
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<property name="hibernate.c3p0.max_size">20</property> aSkH<5i`v  
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<property name="hibernate.c3p0.min_size">5</property> #(=8 RA:@  
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<property name="hibernate.c3p0.timeout">120</property> $F"'=+0  
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<property name="hibernate.c3p0.max_statements">100</property> a<*q+a(*W  
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<property name="hibernate.c3p0.idle_test_period">120</property> T
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<property name="hibernate.c3p0.acquire_increment">2</property> m-Z<zEQ  
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</session-factory> AQ+MjS,  
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</hibernate-configuration> d^h`gu~3  
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3．proxool连接池 ~(
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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 lidVe]>  
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Anything outside the "proxool" tag is ignored. --> m4\e`nl  
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<alias>DBPool</alias> ~#MXhhqB  
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<!--proxool只能管理由自己产生的连接--> {<cL@W  
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<driver-class>com.mysql.jdbc.Driver</driver-class> 9 1.gE*D  
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<property name="user" value="root"/> p!o-+@ava  
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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 ~2;\)/E\  
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收,超时的销毁--> Hp>_:2O8s  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> 0Ke2%+yqJ  
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用户连接就不会被接受--> dv Vz#  
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<maximum-new-connections>20</maximum-new-connections> Te
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等待请求数由maximum-new-connections决定--> 6e S~*  
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<maximum-connection-count>100</maximum-connection-count> 3a|pk4M  
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<minimum-connection-count>10</minimum-connection-count> ,D'm#Fti  
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(2)配置hibernate.cfg.xml文件 +|x{?%
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" FUf.3@}  
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<property name="hibernate.proxool.pool_alias">DBPool</property> ^^zj4 }On?  
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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 1U#W=Fg'  
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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 B1J,4  
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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。 05k'TqT{c  
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(4) dialect是声明ＳＱＬ语句的方言 S6(48/  
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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。 v@
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(6) <mapping >资源文件映射 B*mZxY1  
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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： wW p7N  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 p0 X%^A,4  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory =WUL%MfW  
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hibernate.transaction.manager_loopup_class = s|H7;.3gp  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect -k7b# +T