hibernate连接池

1．Hibernate默认连接池 W(62.3d~}?  
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<?xml version='1.0' encoding='UTF-8'?> O C;~ H{  
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<!DOCTYPE hibernate-configuration (%6fZ  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" 6EY\  
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"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> "y8W5R5kL4  
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<hibernate-configuration> %Ja0:
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<session-factory > /\e_B6pF<  
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<!?JDBC驱动程序--> PC5$TJnj3  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> P:Q&lnC  
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<!-- 连接数据库的URL--> y=Eb->a){  
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<property name="connection.url"> *QN,wBQ  
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jdbc:mysql://localhost:3306/schoolproject # ,H!<X;SS  
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<property name="connection.useUnicode">true</property> xm=Gt$>.o  
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<property name="connection.characterEncoding">UTF-8</property> D<70rBf2  
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<!--连接的登录名--> BW)@.!C  
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<property name="connection.username">root</property> )M8,Tv*~  
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<property name="connection.password"></property> Z6b]EcP)#  
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<!--是否将运行期生成的SQL输出到日志以供调试--> N*[b26  
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<property name="show_sql">true</property> pq_U?_5Z'r  
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<!--指定连接的语言--> oumbJ7X=L  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> ld"rL6  
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<!--映射Student这个资源--> |oOAy  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> u)zv`m  
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</session-factory> o; 6^:  
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2．C3P0连接配置 n2_;:=  
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<?xml version='1.0' encoding='UTF-8'?> /]0SF_dZ  
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<!DOCTYPE hibernate-configuration M*cF'go  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" OVxg9
 
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"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> }%c>Hh  
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<hibernate-configuration> =[:E  

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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> 3(t3r::&  
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<!-- 连接数据库的URL--> raSga'uT;  
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<property name="connection.url"> } 7:T? `V:  
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jdbc:mysql://localhost:3306/schoolproject 0Ntvd7"`}  
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</property> +Q"~2_q5/;  
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<property name="connection.useUnicode">true</property> jAcKSx$}y"  
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<property name="connection.characterEncoding">UTF-8</property> r|]YS6  
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<!--连接的登录名--> {jwLVKT$  
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<property name="connection.username">root</property>
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<property name="connection.password"></property> O&y`:#  
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<!-- C3P0连接池设定--> f
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider X<$DN
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<property name="hibernate.c3p0.max_size">20</property> SYf1dbc..u  
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<property name="hibernate.c3p0.min_size">5</property> >!lpI5'Z&  
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<property name="hibernate.c3p0.timeout">120</property> gs/ocu  
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<property name="hibernate.c3p0.max_statements">100</property> \o72VHG66  
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<property name="hibernate.c3p0.idle_test_period">120</property> l\Ww^   
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<property name="hibernate.c3p0.acquire_increment">2</property> M=&,+#z<V  
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<property name="show_sql">true</property> <HN{.p{  
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<!--指定连接的语言--> q &{<HcP  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> #pK" ^O*!  
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<!--映射Student这个资源--> )cP)HbOd=  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> ,d*hhe  
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</session-factory> vp*+Ckd  
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</hibernate-configuration>
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3．proxool连接池 t&[<Dl/L  
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(1) 先写proxool的配置文件，文件名：proxool.xml（一般放在与hibernate.cfg.xml文件在同一个目录中）本例配置的是MYSQL数据库，数据库的名字为schoolproject kcg\f@d$  
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<?xml version="1.0" encoding="UTF-8"?> ~Fwbi  
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<!-- the proxool configuration can be embedded within your own application's. ZE_  
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Anything outside the "proxool" tag is ignored. --> 
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<proxool> MpZ\j  
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<alias>DBPool</alias> 8=joVbs  
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<!--proxool只能管理由自己产生的连接--> DC-d@N+  
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<driver-url> a\}MJ5]  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 zUv#%Q8vw  
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</driver-url> |m ?ZE:  
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<!?JDBC驱动程序--> vPz7*w  
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<driver-class>com.mysql.jdbc.Driver</driver-class> ^IIy>  
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<driver-properties> o,*D8[  
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<property name="user" value="root"/>  <9yh:1"X  
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<property name="password" value=""/> S5y.H  
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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 ^rP]B-)  
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收,超时的销毁--> S**eI<QFSk  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> \i%mokfbc  
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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 9CeR^/i  
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用户连接就不会被接受--> tLfhW1"  
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<maximum-new-connections>20</maximum-new-connections> =uAy/S  
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<prototype-count>5</prototype-count> VK1B}5/  
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<!-- 允许最大连接数,超过了这个连接，再有请求时，就排在队列中等候，最大的 @CL#B98jl  
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等待请求数由maximum-new-connections决定--> {o)pwM"@(  
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<maximum-connection-count>100</maximum-connection-count> g;8 wP5i  
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<minimum-connection-count>10</minimum-connection-count> ty0P9.Q  
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(2)配置hibernate.cfg.xml文件 c!4F0(n4  
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<!DOCTYPE hibernate-configuration M[YFyM(
 
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" ~&73f7  
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<hibernate-configuration> EaO@I.[  
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<property name="hibernate.connection.provider_class"> U+)p'%f;  
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org.hibernate.connection.ProxoolConnectionProvider LEgP-sW  
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</property> \@:,A]  
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<property name="hibernate.proxool.pool_alias">DBPool</property> [!A[oK9i C  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> 7w/IHML  
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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 +T+@g8S  
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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 kz"uTJK  
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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!\pE-  
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(4) dialect是声明ＳＱＬ语句的方言 V)`2Kw  
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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。 pN%&`]Wev  
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(6) <mapping >资源文件映射 Z4j6z>qE  
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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： 4>hHUz[_  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 y/lF1{}5  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory \c=I!<9
 
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hibernate.transaction.manager_loopup_class = :S+K\  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect x*Lt]]A