hibernate连接池

1．Hibernate默认连接池 u:Af
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<?xml version='1.0' encoding='UTF-8'?> k Z+q  
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<!DOCTYPE hibernate-configuration r6oX6.c  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" ~zE 1'  
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<hibernate-configuration> a2cx  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> RR[)UQ  
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<!-- 连接数据库的URL--> ;-3h~k  
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<property name="connection.url"> Kf:2%_DB  
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jdbc:mysql://localhost:3306/schoolproject W;3 R;  
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<property name="connection.useUnicode">true</property> {Ior.(D>Y  
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<property name="connection.characterEncoding">UTF-8</property> NDB*BmG  
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<!--连接的登录名--> Qv&T E3  
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<property name="connection.username">root</property> paq8L{R  
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<property name="connection.password"></property> 4u3 \xR?w6  
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<!--是否将运行期生成的SQL输出到日志以供调试--> a='IT 5  
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<!--映射Student这个资源--> i{<8 hLO  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" />
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2．C3P0连接配置 Q]!6uA$A  
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<!DOCTYPE hibernate-configuration |__d 8a  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" |d5ggf.w  
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"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> O\%j56Bf  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> cnbo+U  
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<property name="connection.url"> ohtT O]\  
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jdbc:mysql://localhost:3306/schoolproject =<Hy"4+?.  
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<property name="connection.useUnicode">true</property> b"^\)|*4;  
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<property name="connection.characterEncoding">UTF-8</property> 5H~@^!7t  
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<property name="connection.password"></property> CNq[4T'~A  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider `6UtxJSx  
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<property name="hibernate.c3p0.max_size">20</property> !KAsvF,j  
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<property name="hibernate.c3p0.min_size">5</property> (V8?,G>  
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<property name="hibernate.c3p0.timeout">120</property> 'P,,<nkr|  
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<property name="hibernate.c3p0.max_statements">100</property> ?@>;/@  
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<property name="hibernate.c3p0.idle_test_period">120</property> K\~v&  
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<property name="hibernate.c3p0.acquire_increment">2</property> ZOC#i i`:  
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3．proxool连接池 TGpSulg7  
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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 /[?Jylj  
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Anything outside the "proxool" tag is ignored. --> ls @5^g  
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<proxool> 2GUupnQkD  
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<alias>DBPool</alias> Sn ^Aud  
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<driver-url> 27iy4(4  
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<driver-class>com.mysql.jdbc.Driver</driver-class> 7}o6_i  
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<driver-properties> _.=`>%,  
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<property name="user" value="root"/> JCcQd01z  
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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 m#MlH=-  
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收,超时的销毁--> /4-}k  
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<maximum-new-connections>20</maximum-new-connections> gZ*hkKN6  
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等待请求数由maximum-new-connections决定--> $Ba`VGP>)3  
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<maximum-connection-count>100</maximum-connection-count> 2n(ItA  
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<minimum-connection-count>10</minimum-connection-count> GeVc\$K-  
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(2)配置hibernate.cfg.xml文件 &%}bRPUl  
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<hibernate-configuration> 1ZKz3)K  
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<property name="hibernate.connection.provider_class"> 8Er[M  
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<property name="hibernate.proxool.pool_alias">DBPool</property> Vvxa.B  
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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 -wPuml!hZ|  
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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 C5.\;;7^&  
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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。 ux"D ]P  
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(4) dialect是声明ＳＱＬ语句的方言 P_:?}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。 3fbD"gL  
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(6) <mapping >资源文件映射 ]6?c8/M  
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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： ~Q.8 U3"  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory Ivd[U`=Q  
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hibernate.transaction.manager_loopup_class = b.w(x*a  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect #J<`p