hibernate连接池

1．Hibernate默认连接池 X5)>yM^N`  
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<?xml version='1.0' encoding='UTF-8'?> pKp#4Js  
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<!DOCTYPE hibernate-configuration J@1(2%)|Z  
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<hibernate-configuration> x%$Z/  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> !(+?\+U lE  
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<!-- 连接数据库的URL--> rNI3_|a  
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<property name="connection.url"> \QHM7C T  
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jdbc:mysql://localhost:3306/schoolproject J,jl(=G  
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<property name="connection.useUnicode">true</property> ?t<wp3bZ  
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<property name="connection.characterEncoding">UTF-8</property> # VR}6Jv  
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<!--连接的登录名--> r}XD{F}"  
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<property name="connection.username">root</property> f *)t<1f  
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<property name="connection.password"></property> Kz'W |  
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<property name="show_sql">true</property> $z` jR*  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> |[xi"E\  
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<!--映射Student这个资源--> EMJ}tvL0Tp  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> SkN^ytKE  
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2．C3P0连接配置 s2&UeYbIs  
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<!DOCTYPE hibernate-configuration /n(0nU[  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" .'>r?%a  
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<!?JDBC驱动程序--> 8=t?rA  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> Y|KX:9Y@  
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<property name="connection.url"> {h
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jdbc:mysql://localhost:3306/schoolproject H| IsjC
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<property name="connection.useUnicode">true</property> <@e6zQG  
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<property name="connection.characterEncoding">UTF-8</property> F;`es%8  
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<property name="connection.username">root</property> _d)w, ;m#  
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<!-- C3P0连接池设定--> W:hR81ci  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider Q8T4_p[-o  
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<property name="hibernate.c3p0.max_size">20</property> o y}(  
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<property name="hibernate.c3p0.min_size">5</property> x&8fmUS:@;  
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<property name="hibernate.c3p0.timeout">120</property> Zo'lvOpyZ  
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<property name="hibernate.c3p0.max_statements">100</property> Y"G$^3% (]  
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<property name="hibernate.c3p0.idle_test_period">120</property> rDm>R
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<property name="hibernate.c3p0.acquire_increment">2</property> t55CT6Se  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> RhX 2qsva-  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> @DY0Lz;  
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</session-factory> UyTq(7uo  
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</hibernate-configuration> ;MNEe% TJ  
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3．proxool连接池 a5]~%xdK  
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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 8I NVn'G  
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<!-- the proxool configuration can be embedded within your own application's. {%b>/r  
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Anything outside the "proxool" tag is ignored. --> QO%>RG  
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<proxool> ax7ub  
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<alias>DBPool</alias> 2Xe2%{  
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<driver-url> U>ob)-tl  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 B~LB^ n(>@  
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<!?JDBC驱动程序--> ^Q2K0'm5  
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<driver-class>com.mysql.jdbc.Driver</driver-class> ;)cSdA9  
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<driver-properties> >:KPvq!0  
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<property name="user" value="root"/> C0KP,JS&  
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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 B7N?"'$i  
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收,超时的销毁--> /!jn$4fd:  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> nVs0
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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 dwB-WF%k  
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用户连接就不会被接受--> J|,| *t  
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<maximum-new-connections>20</maximum-new-connections> 5FH#)  
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<prototype-count>5</prototype-count> (fY(-  
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等待请求数由maximum-new-connections决定--> b.j\=c  
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<maximum-connection-count>100</maximum-connection-count> `Z/"Dd;F^3  
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<minimum-connection-count>10</minimum-connection-count> Y7!,s-v4W  
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(2)配置hibernate.cfg.xml文件 s.Yywy  
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<!DOCTYPE hibernate-configuration 8 :Z3Q  
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<property name="hibernate.connection.provider_class"> R9fM9  
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org.hibernate.connection.ProxoolConnectionProvider u@[D*c1!H  
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<property name="hibernate.proxool.pool_alias">DBPool</property> DoNbCVZ  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> mqw&SxU9  
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<property name="show_sql">true</property> f{k2sU*uBE  
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<!--指定连接的语言--> |V%Qp5 XJ  
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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 V!a\:%#^Y  
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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 O: :X$O7  
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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。 Ql3hq.E  
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(4) dialect是声明ＳＱＬ语句的方言 E@Q+[~H}  
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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。 ,*}SfCon  
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(6) <mapping >资源文件映射 AQQeLdTq  
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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： L6J=m#Ld  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 BC9rsb  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory _U|s!60'  
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hibernate.transaction.manager_loopup_class = I+kDx=T!  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect q6%jCt2'