hibernate连接池

1．Hibernate默认连接池 _BP%@o  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> uJ2ZHrJ  
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<property name="connection.url"> @_C]5D^J^~  
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jdbc:mysql://localhost:3306/schoolproject TAUl{??,  
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<property name="connection.useUnicode">true</property> t5E$u(&+'B  
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<!--连接的登录名--> ^dpM2$J  
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<property name="connection.username">root</property> 0Ye/
 
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<!--是否将运行期生成的SQL输出到日志以供调试--> e&x)g;bn  
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<!--指定连接的语言--> .h <=C&Yg  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
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2．C3P0连接配置 U)'YR$2<
 
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> .?#Q(eLj  
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<property name="connection.url"> BT(eU*m-  
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jdbc:mysql://localhost:3306/schoolproject EQoK\.; G~  
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<property name="connection.useUnicode">true</property> 1WaQWZ:=  
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<property name="connection.characterEncoding">UTF-8</property> @RB^m(> 5  
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<!-- C3P0连接池设定-->
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider l^tRy_T:-  
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<property name="hibernate.c3p0.max_size">20</property> ;<o?JM  
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<property name="hibernate.c3p0.min_size">5</property> B!x6N"  
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<property name="hibernate.c3p0.timeout">120</property> guCCu2OTA%  
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<property name="hibernate.c3p0.max_statements">100</property> uQ ]ZMc  
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<property name="hibernate.c3p0.idle_test_period">120</property> ^Et^,I:`  
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<property name="hibernate.c3p0.acquire_increment">2</property> *k&V;?x|wt  
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3．proxool连接池 D\-DsT.H  
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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 @d8Nr:  
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Anything outside the "proxool" tag is ignored. --> ,1t|
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<proxool> 9[&q C  
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<alias>DBPool</alias> |rgPHRX^Hn  
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<!--proxool只能管理由自己产生的连接--> *6}'bdQbNP  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 >%N,F`^3  
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<driver-class>com.mysql.jdbc.Driver</driver-class> 150x$~{/  
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<driver-properties>  zDxJK  
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<property name="user" value="root"/> Fl(j,B6Z  
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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 k|jr+hmn":  
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收,超时的销毁--> v@fy*T\3  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> (b1e!gJpy  
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用户连接就不会被接受--> <a+@4d;  
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<maximum-new-connections>20</maximum-new-connections> LXth-j=]  
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等待请求数由maximum-new-connections决定--> :N_DJ51
 
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<minimum-connection-count>10</minimum-connection-count> Ef@Et(f_mQ  
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(2)配置hibernate.cfg.xml文件 |tse"A5Z  
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<property name="hibernate.connection.provider_class"> J`{o`>  
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<property name="hibernate.proxool.pool_alias">DBPool</property> i1bmUKZ8'L  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> |WOc0M[U  
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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 BL"7_phM,  
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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 uv^x  
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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。 |k,-]c;6  
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(4) dialect是声明ＳＱＬ语句的方言 DVJn;X^T:  
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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。 1uB$@a\  
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(6) <mapping >资源文件映射 }d;6.~Gw  
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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： ou<,c?nNM  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 gU NWM^n  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory Uqy/~n-v<  
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hibernate.transaction.manager_loopup_class = D{[{&1\)r  
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org.hibernate.transaction.JBossTransactionManagerLookup a(D=ZKbVU  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect fFWi 3.