hibernate连接池

1．Hibernate默认连接池 }W]k1Bsx  
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<?xml version='1.0' encoding='UTF-8'?> N aiZU  
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<!DOCTYPE hibernate-configuration l>>,~  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" vi.q]$ohbV  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> [+$o`0q;N?  
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<!-- 连接数据库的URL--> [W,maTM"  
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<property name="connection.url"> B,dKpz;kFg  
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jdbc:mysql://localhost:3306/schoolproject G@n%P~  
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<property name="connection.useUnicode">true</property> A|U_$!cLZ  
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<property name="connection.characterEncoding">UTF-8</property> SA$1rqU=  
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<property name="connection.username">root</property> ;yH1vX  
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<property name="show_sql">true</property> 
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> l;g8_uyjv7  
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<!--映射Student这个资源--> !>+Na~eN  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> Z*|qbu)  
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</hibernate-configuration> AcYL3  

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2．C3P0连接配置 Q pY:L  
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<!DOCTYPE hibernate-configuration <zK9J?ZQW>  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" @BN cIJk9  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> Au,}5=+`P  
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<!-- 连接数据库的URL--> ;%#@vXH[Oo  
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<property name="connection.url"> fmvv q1G&  
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jdbc:mysql://localhost:3306/schoolproject m(8t |~S  
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</property> !_cT_ WHty  
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<property name="connection.useUnicode">true</property> S3Tww
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<property name="connection.characterEncoding">UTF-8</property> 2Fce| Tn  
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<property name="connection.username">root</property> Au"[2cG  
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<property name="connection.password"></property> !+T+BFw.  
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<!-- C3P0连接池设定--> kO\(6f2|x  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider 5sx-u!7  
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<property name="hibernate.c3p0.max_size">20</property> }$;T.[ ~  
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<property name="hibernate.c3p0.min_size">5</property> >=i47-H  
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<property name="hibernate.c3p0.timeout">120</property> {JzX`Z30l  
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<property name="hibernate.c3p0.max_statements">100</property> !o&Mw:d  
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<property name="hibernate.c3p0.idle_test_period">120</property> rsvZi1N4w$  
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<property name="hibernate.c3p0.acquire_increment">2</property> +tOBt("5/  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> ."PR Z,  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> yGH'|`  
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</session-factory> =6q?XOM  
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3．proxool连接池 ]ODC+q1  
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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 {`KgyCW:  
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<!-- the proxool configuration can be embedded within your own application's. I1&Z@[  
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Anything outside the "proxool" tag is ignored. --> $ZXy&?4  
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<proxool> s>"=6gb  
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<alias>DBPool</alias> #'^p-Jdm  
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<!--proxool只能管理由自己产生的连接--> -t?S:9[w  
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<driver-url> ^Cyx"s't  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 H<%7aOwO2  
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<driver-class>com.mysql.jdbc.Driver</driver-class> Otn,(j;u  
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<driver-properties> gUL`)t\}*  
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<property name="user" value="root"/> lV`y6{o#T  
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<property name="password" value=""/> vp4!p~C{  
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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 |j^>6nE  
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收,超时的销毁--> t{!}^{ "5  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> E^1uZI\z  
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<maximum-new-connections>20</maximum-new-connections> e@Z(z^V  
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<prototype-count>5</prototype-count> /_x?PiL  
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等待请求数由maximum-new-connections决定--> n|SsV  
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<maximum-connection-count>100</maximum-connection-count> vsqfvx  
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<minimum-connection-count>10</minimum-connection-count> I#Iu:,OT  
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(2)配置hibernate.cfg.xml文件 w;}P<K
 
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<!DOCTYPE hibernate-configuration Rw^4S@~T  
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<hibernate-configuration> N=zrY`Vd  
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<property name="hibernate.connection.provider_class"> g>/,},jv[x  
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<property name="hibernate.proxool.pool_alias">DBPool</property> qI^6}PB  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> X*]uLgbl  
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<property name="show_sql">true</property> a7%5Qg9B;  
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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 L1VUfEG-  
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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 d2Z5HFtY  
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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。 u+&BR1)C  
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(4) dialect是声明ＳＱＬ语句的方言 )%-FnW  
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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。 \v)Dy)Vhg2  
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(6) <mapping >资源文件映射 &;&i#ZO  
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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<RMYQ  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 kl?U2A.=  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory f<=<:+  
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hibernate.transaction.manager_loopup_class = %\6|fKB4<  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect )M<"YI)g