hibernate连接池

1．Hibernate默认连接池 &S9Sl  
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<?xml version='1.0' encoding='UTF-8'?> >Du5B&41  
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<!DOCTYPE hibernate-configuration $EHAHNL?Lx  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" ;o }pRC  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> #aUe7~  
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<!-- 连接数据库的URL--> % FW__SN$c  
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<property name="connection.url"> bSsX)wHm  
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jdbc:mysql://localhost:3306/schoolproject ?XO$9J  
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<property name="connection.useUnicode">true</property> Kg^L 4Q  
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<property name="connection.characterEncoding">UTF-8</property> '^"6EF.R  
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<property name="connection.username">root</property> 9Y&,dBj+  
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<property name="connection.password"></property> i3g;B?54  
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<property name="show_sql">true</property> l1On .s  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> j4RM'_*G  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> z17  
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</session-factory> fdP[{.$?(  
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2．C3P0连接配置 v`8dRVN  
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<!DOCTYPE hibernate-configuration PW)XDo7  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" is_`UDaB  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> RMU]GCa  
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<property name="connection.url"> y1P KoN|K  
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jdbc:mysql://localhost:3306/schoolproject }I_/>58  
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</property> ;\yY*  
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<property name="connection.useUnicode">true</property> wlr/zquAE9  
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<property name="connection.characterEncoding">UTF-8</property> G3vKA&KZ  
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<property name="connection.username">root</property> b}63?.M{  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider "F%w{bf  
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<property name="hibernate.c3p0.max_size">20</property> :/'2@M  
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<property name="hibernate.c3p0.min_size">5</property> {p&M(
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<property name="hibernate.c3p0.timeout">120</property> !ckm
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<property name="hibernate.c3p0.max_statements">100</property> 3x2*K_A5:Q  
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<property name="hibernate.c3p0.idle_test_period">120</property> 4kZX$ct}  
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<property name="hibernate.c3p0.acquire_increment">2</property> f,{O%*PUA  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> 1j7^2Y|UT`  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> 9&e=s<6dO  
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3．proxool连接池 QRbiO  
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(1) 先写proxool的配置文件，文件名：proxool.xml（一般放在与hibernate.cfg.xml文件在同一个目录中）本例配置的是MYSQL数据库，数据库的名字为schoolproject y>}dKbCN  
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Anything outside the "proxool" tag is ignored. --> > cFH=um  
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<proxool> 
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<driver-url> MVe:[=VOT|  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 ]ADj9  
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<driver-class>com.mysql.jdbc.Driver</driver-class> 9C;Hm>WEpP  
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<property name="user" value="root"/> Y`$dtg {  
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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 IK#W80y  
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收,超时的销毁--> ~fL:pVp  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> khSb|mR)  
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<maximum-new-connections>20</maximum-new-connections> t^N 92$|  
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等待请求数由maximum-new-connections决定--> kGaK(^w  
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<minimum-connection-count>10</minimum-connection-count> *Ru@F:  
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(2)配置hibernate.cfg.xml文件 U%E6"Hg  
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<property name="hibernate.proxool.pool_alias">DBPool</property> ; E Nhy  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> -}2'P)Xp  
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(1) hibernate.connection.provider_class定义Hibernate的连接加载类，这里Proxool连接池是用这个，不同的连接池有不同的加载类，可以查阅Hibernate文档获取相关信息
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(2) hibernate.proxool.pool_alias这里就是用我们上面提到的连接池的别名 %/b3G*$W  
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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。 Ek0zFnb[Gx  
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(4) dialect是声明ＳＱＬ语句的方言 b4l=Bg"  
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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。 D..dGh.MY  
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(6) <mapping >资源文件映射 fjc8@S5x9j  
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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： --(e(tvf  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 oCl $ 0x  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory z#$>f*b  
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hibernate.transaction.manager_loopup_class = L4fM?{Ic:s  
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