hibernate连接池

1．Hibernate默认连接池 +IuV8XT2(  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> 0+/L?J3  
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<property name="connection.url"> 3cT  
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<property name="connection.useUnicode">true</property> &'WgBjP  
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<property name="connection.username">root</property> @`%.\_  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> $T;3*D90  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> ZJy D/9y  
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2．C3P0连接配置 S:Yo9~  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> z,2m7C  
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<property name="connection.url"> \[,7#  
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jdbc:mysql://localhost:3306/schoolproject ke&c<3m  
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<property name="connection.useUnicode">true</property> }cS3mJ  
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<property name="connection.characterEncoding">UTF-8</property> }>tUkXlhJ<  
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<property name="connection.password"></property> 9I pjY~or  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider */Y@:Sjf  
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<property name="hibernate.c3p0.max_size">20</property> y#T":jpR  
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<property name="hibernate.c3p0.timeout">120</property> 5HJ6[.HO  
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<property name="hibernate.c3p0.max_statements">100</property> 98V9AOgk  
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<property name="hibernate.c3p0.idle_test_period">120</property> fx=aT  
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<property name="hibernate.c3p0.acquire_increment">2</property> 5[;p<GqGN  
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<property name="show_sql">true</property> RAxA H  

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3．proxool连接池 >#xpg&2x  
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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 GHH1jJ_[7  
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Anything outside the "proxool" tag is ignored. --> 1*(^<x+n  
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<proxool> !`Bb[
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<alias>DBPool</alias> S'2
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<driver-url> Vcc/  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 '$4o,GA8  
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<driver-class>com.mysql.jdbc.Driver</driver-class> rhwY5FD?  
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<driver-properties> o#H"tYP  
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<property name="user" value="root"/> l`fjz-eE  
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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 oq(um:m  
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收,超时的销毁--> TZ?va@2  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> P ;PS+S9  
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<maximum-new-connections>20</maximum-new-connections> /`?i&\C3r  
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<prototype-count>5</prototype-count> }<9*eAn`  
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等待请求数由maximum-new-connections决定--> 6Z\[{S];  
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(2)配置hibernate.cfg.xml文件 ;sT7c1X^!  
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<property name="hibernate.proxool.pool_alias">DBPool</property> 7Q7z6p/\v  
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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 #Y`GWT1==  
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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 422d4Zu  
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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。 DyIuM{Owj  
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(4) dialect是声明ＳＱＬ语句的方言 JJ[.K*dO  
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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。 42kr&UY&  
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(6) <mapping >资源文件映射 GZ( W64  
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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： :1NF#-2\f  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 >J,Rx!fq3  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory yU]NgG=z:-  
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hibernate.transaction.manager_loopup_class = II
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hibernate.dialect=org.hibernate.dialect.MySQLDialect _3v6c