hibernate连接池

1．Hibernate默认连接池 9,8}4Y=GVI  
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<?xml version='1.0' encoding='UTF-8'?> GddP)l{uCF  
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<!DOCTYPE hibernate-configuration kex4U6&OQB  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" B+W 4r9#  
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"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> ^0"W/  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> !I3_KuJ5  
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<!-- 连接数据库的URL--> ks{y=@<,  
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<property name="connection.url"> .7lDJ2  
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jdbc:mysql://localhost:3306/schoolproject ^eu={0k  
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<property name="connection.useUnicode">true</property> 0|mF /  
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<property name="connection.characterEncoding">UTF-8</property> ZV:cgv  
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<!--连接的登录名--> jV:Krk6T<  
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<property name="connection.username">root</property> Zp:(U3%  
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<property name="connection.password"></property> P'wn$WE[n\  
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<!--是否将运行期生成的SQL输出到日志以供调试--> Na6z1&wS  
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<property name="show_sql">true</property> S(bYN[U  
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<!--指定连接的语言-->  ]I pLF#  

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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> /HlLfW  
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<!--映射Student这个资源--> "Q{)H8,E)x  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> ?\_\pa/+  
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</session-factory> ! };OLQ  
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2．C3P0连接配置 C2$_Ad=s  
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<!DOCTYPE hibernate-configuration y;'yob  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" <FaF67[Q  
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"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> HUP~  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> #pe#(xoI  
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<property name="connection.url"> <%_7%  
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jdbc:mysql://localhost:3306/schoolproject N9SC\  
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<property name="connection.useUnicode">true</property> E}YJGFB7"  
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<property name="connection.characterEncoding">UTF-8</property> [Dzd39aKr  
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<!--连接的登录名--> K@RE-K6{  
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<property name="connection.username">root</property> yF [|dB  
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<property name="connection.password"></property> ?3duW$`  
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<!-- C3P0连接池设定--> Ad:}i9-x  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider , z-#B]  
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<property name="hibernate.c3p0.max_size">20</property> )R+26wZ|n*  
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<property name="hibernate.c3p0.min_size">5</property> ;2&ym
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<property name="hibernate.c3p0.timeout">120</property> '5usPD  
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<property name="hibernate.c3p0.max_statements">100</property> Ic<J]+Xq  
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<property name="hibernate.c3p0.idle_test_period">120</property> \>G:mMk/  
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<property name="hibernate.c3p0.acquire_increment">2</property> U!TSAg
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<property name="show_sql">true</property> FD1Z}v!5IJ  
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<!--指定连接的语言--> vl"{ovoC  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> /[FES78p  
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<!--映射Student这个资源--> 'CfM'f3uu  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> B/^1uPTZ71  
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</session-factory> Y+ Qm.  
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</hibernate-configuration> qt.Y6s:r_  
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3．proxool连接池 0kiV-yc   
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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 FWb`F&  
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<!-- the proxool configuration can be embedded within your own application's. W*!u_]K>  
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<proxool> 79y'PFSms  
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<alias>DBPool</alias> {{+woL'C  
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<!--proxool只能管理由自己产生的连接--> PpWn+''M  
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<driver-url> 47 |&(,{  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8  #-^y9B  
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<driver-class>com.mysql.jdbc.Driver</driver-class> QBwgI>zfS"  
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<property name="user" value="root"/> mvV5Xal  
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<property name="password" value=""/> TxDzG
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</driver-properties> ]$xN`O4W{  
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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 u''~nSR3&  
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收,超时的销毁--> P{{U  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> tiHP?N
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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 (;1Pgh  
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用户连接就不会被接受--> GJB=5nE  
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<maximum-new-connections>20</maximum-new-connections> qTd6UKg  
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<prototype-count>5</prototype-count> ;~ ,<8  
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等待请求数由maximum-new-connections决定--> xOgUX6n  
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<maximum-connection-count>100</maximum-connection-count> V/@?KC0B5  
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<minimum-connection-count>10</minimum-connection-count> FY(C<fDRo{  
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(2)配置hibernate.cfg.xml文件 "2
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<!DOCTYPE hibernate-configuration R]8^ @i1  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" SF#Rc>v  
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"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> 'CkN  
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<hibernate-configuration> w6w'Jx  
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<property name="hibernate.connection.provider_class"> :(o6^%x  
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<property name="hibernate.proxool.pool_alias">DBPool</property> >*"6zR2 o  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> >tFv&1iR  
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<property name="show_sql">true</property> ~.,h12  
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<!--指定连接的语言--> :y!%GJW  
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</session-factory> ?(!<m'jEy  
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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 =CE(M},d  
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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 ZPISclSA+  
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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。 i{$h]D_fD  
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(4) dialect是声明ＳＱＬ语句的方言 >,JA=s  
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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。 3N]  
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(6) <mapping >资源文件映射 3/w) mY-o  
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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： Viu+#J;l  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 =eXJZPR  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory mu(EmAoenQ  
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hibernate.transaction.manager_loopup_class = zgdOugmmt_  

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hibernate.dialect=org.hibernate.dialect.MySQLDialect UBUZ}ZIbN