hibernate连接池

1．Hibernate默认连接池 Lt`d {s  
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<?xml version='1.0' encoding='UTF-8'?> S. my" j  
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<!DOCTYPE hibernate-configuration sjl(  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" _~~:@fy  
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<hibernate-configuration> (Z(O7X(/  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> (=#[om(A  
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<!-- 连接数据库的URL--> Su"9`  
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<property name="connection.url"> o[Ojl.r<  
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jdbc:mysql://localhost:3306/schoolproject V9
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<property name="connection.useUnicode">true</property> M
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<property name="connection.characterEncoding">UTF-8</property> 2stBW5v3  
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<property name="connection.username">root</property> X}"Ic@8  
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<property name="connection.password"></property> Gg'sgn   
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<property name="show_sql">true</property> b!(ew`Y;  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> ai,\'%N  
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<!--映射Student这个资源--> 8&[Lr o9  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> ++>HU{  
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</session-factory> #kGgzO  
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</hibernate-configuration> WG~|sLg  
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2．C3P0连接配置 *??!~RE  
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<!DOCTYPE hibernate-configuration IBP3  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" ]|H`?L  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> W;Pd
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<!-- 连接数据库的URL--> B|\JGnNQ  
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<property name="connection.url"> ]VKM3[   
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jdbc:mysql://localhost:3306/schoolproject a*hWODYn  
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<property name="connection.useUnicode">true</property> Ym% $!#  
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<property name="connection.characterEncoding">UTF-8</property> 3p+V~n.+  
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<property name="connection.username">root</property> 5SB!)F]  
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<!-- C3P0连接池设定--> VYR<x QA  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider `i
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<property name="hibernate.c3p0.max_size">20</property> mhNX05D  
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<property name="hibernate.c3p0.min_size">5</property> mi';96

  
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<property name="hibernate.c3p0.timeout">120</property> B,5kG{2!  
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<property name="hibernate.c3p0.max_statements">100</property> *HONA>u   
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<property name="hibernate.c3p0.idle_test_period">120</property> {}n]\zO %  
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<property name="hibernate.c3p0.acquire_increment">2</property> W?:e4:Q  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> E]P7u"1  
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<!--映射Student这个资源--> "!B\c9q
 
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> FKH_o  
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</session-factory> KU=+ 1,Jf  
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</hibernate-configuration> )Tl]1^  
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3．proxool连接池 V q[4RAd^P  
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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 nZX`y -AZ  
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Anything outside the "proxool" tag is ignored. --> "!9FJ Y  
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<proxool> ?dyt!>C  
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<alias>DBPool</alias> ~='}(Fg:  
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<driver-url> r`Bm"xI  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 Rr0]~2R  
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<!?JDBC驱动程序--> wD92Ava   
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<driver-class>com.mysql.jdbc.Driver</driver-class> f%/6kz  
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<driver-properties> \HL66%b[  
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<property name="user" value="root"/> wWVB'MRXB,  
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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 ~cf
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收,超时的销毁--> Ie}7#>S  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> Q">wl  
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<prototype-count>5</prototype-count> rX22%~1  
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等待请求数由maximum-new-connections决定--> k- exqM2x=  
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<minimum-connection-count>10</minimum-connection-count> m4^VlE,`Dh  
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(2)配置hibernate.cfg.xml文件 KVHK~Y-G  
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<!DOCTYPE hibernate-configuration oJZ0{^  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" O]l-4X#8F  
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<hibernate-configuration> GYonb)F  
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<property name="hibernate.connection.provider_class"> )+.AgqxI  
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</property>
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<property name="hibernate.proxool.pool_alias">DBPool</property> xRF_'|e  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> P.~sNd oJ  
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<property name="show_sql">true</property> 7A  
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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 B^hK  
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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 dRTpG
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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。 j MA%`*r  
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(4) dialect是声明ＳＱＬ语句的方言 98WJ"f_ #  
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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。 4W+nSv  
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(6) <mapping >资源文件映射 A3zNUad;  
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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： St1>J.k_  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 &l~=c2  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory {XYf"ONi  
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hibernate.transaction.manager_loopup_class = ~K|o@LK  

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hibernate.dialect=org.hibernate.dialect.MySQLDialect {c$%3iQq