hibernate连接池

1．Hibernate默认连接池 U_}A{bFG  
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<!DOCTYPE hibernate-configuration >xZhK63C/  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" _+Jf.n20  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> ;X$q#qzN
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<property name="connection.url"> 62MRI  
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jdbc:mysql://localhost:3306/schoolproject _^6|^PT.  
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<property name="connection.useUnicode">true</property> M q^|M~  
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<property name="connection.characterEncoding">UTF-8</property> ':!3jZP"m  
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<property name="connection.password"></property> ;m@1Ec@*p  
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<!--映射Student这个资源--> DR k]{^C~  

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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> K<@[_W+  
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2．C3P0连接配置 ss?]  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" 9<xTu>7J  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> {tPnj_|n<  
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<property name="connection.url"> cv3L&zg M  
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jdbc:mysql://localhost:3306/schoolproject o6*/o ]]  
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<property name="connection.useUnicode">true</property> C1 W>/?XC  
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<property name="connection.characterEncoding">UTF-8</property> ugno]5Ni  
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<property name="connection.username">root</property> m$?.Yig?  
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<!-- C3P0连接池设定--> AuAT]`  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider 4f!dYo4L  
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<property name="hibernate.c3p0.max_size">20</property>  DwXU  
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<property name="hibernate.c3p0.min_size">5</property> 6}ftBmv  
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<property name="hibernate.c3p0.timeout">120</property> q[P~L`h S  
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<property name="hibernate.c3p0.max_statements">100</property> d@ZoV  
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<property name="hibernate.c3p0.idle_test_period">120</property> dKm`14f]@G  
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<property name="hibernate.c3p0.acquire_increment">2</property> D"cKlp-I6|  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> j&CZ=?K^c  
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3．proxool连接池 hk} t:<  
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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 K]<u8eF  
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<!-- the proxool configuration can be embedded within your own application's. X*O9JGh  
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Anything outside the "proxool" tag is ignored. --> -:SIS`0s  
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<proxool> $<OhGk-  
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<alias>DBPool</alias> HO5d%85  
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<driver-url> zvr\36  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 /U*yw5  
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<driver-class>com.mysql.jdbc.Driver</driver-class> m r4b  
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</driver-properties> ;+`uER  
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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 ` X}85  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> m:{tgcE  
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<maximum-new-connections>20</maximum-new-connections> G$5m$\K  
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等待请求数由maximum-new-connections决定--> _N'75  
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<maximum-connection-count>100</maximum-connection-count> (ZPXdr  
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<minimum-connection-count>10</minimum-connection-count> vWY(%Q,  
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(2)配置hibernate.cfg.xml文件 N z~"vi(t  
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<property name="hibernate.connection.provider_class"> uva\0q  
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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 {!t=n
 
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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 W5I=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。 D3.VXuKn6  
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(4) dialect是声明ＳＱＬ语句的方言 CB
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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。 /e<5Np\X  
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(6) <mapping >资源文件映射 (H-cDsh;c  
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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： ^4UcTjh  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 ;^ov~PPl  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory 5H
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hibernate.transaction.manager_loopup_class = H9E(\)@  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect w&C1=v -h