hibernate连接池

1．Hibernate默认连接池 S?3{G@!  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> ^X;>?_Bk  
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<property name="connection.url"> oaXD^H\  
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jdbc:mysql://localhost:3306/schoolproject C9iG`?  
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<property name="connection.useUnicode">true</property> @"EX%v.  
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<property name="connection.characterEncoding">UTF-8</property> <?7~,#AK  
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<property name="connection.username">root</property> d!X?R}  
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<property name="connection.password"></property> X5yhS  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> #e=^-yE  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> =+L>^w#6=  
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2．C3P0连接配置 F{+`F<r  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> :\OvVS/  
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<property name="connection.url"> v],DBw9  
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jdbc:mysql://localhost:3306/schoolproject WXU6J?tIm  
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<property name="connection.useUnicode">true</property> POXn6R!mM1  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider JUFO.m^w  
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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> E5{)d~q  
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<property name="hibernate.c3p0.timeout">120</property> @\8gzvkt  
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<property name="hibernate.c3p0.max_statements">100</property> mU$7_7V~  
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<property name="hibernate.c3p0.idle_test_period">120</property> %Qz`SO8x?  
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<property name="hibernate.c3p0.acquire_increment">2</property> v6\2mc.  
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3．proxool连接池 Q8cPKDB  
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(1) 先写proxool的配置文件，文件名：proxool.xml（一般放在与hibernate.cfg.xml文件在同一个目录中）本例配置的是MYSQL数据库，数据库的名字为schoolproject =w$"wzc  
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Anything outside the "proxool" tag is ignored. --> -0WCwv  
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<alias>DBPool</alias> QN&^LaB<T  

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<driver-class>com.mysql.jdbc.Driver</driver-class> 8Pr7aT:,  
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<driver-properties> [d~bZS|(T(  
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<property name="user" value="root"/> z "$d5XR  
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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 AD%D ,l  
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收,超时的销毁--> \j})Ku
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> c^bk:=uj  
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<maximum-new-connections>20</maximum-new-connections> kxqc6  
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等待请求数由maximum-new-connections决定--> +=~%S)9F  
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(2)配置hibernate.cfg.xml文件 71.\`'  
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<property name="hibernate.connection.provider_class"> ]KXMGH_  
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<property name="hibernate.proxool.pool_alias">DBPool</property> $' (QTEM  
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(1) hibernate.connection.provider_class定义Hibernate的连接加载类，这里Proxool连接池是用这个，不同的连接池有不同的加载类，可以查阅Hibernate文档获取相关信息 _\dt?(m|  
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(2) hibernate.proxool.pool_alias这里就是用我们上面提到的连接池的别名 .!(,$'(@=  
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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。 x" 'KW (  
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(4) dialect是声明ＳＱＬ语句的方言 J]}FC{CD!  
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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。 !TP6=ks  
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(6) <mapping >资源文件映射 LY-lTr@A^  
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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： @iU%`=ziz  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 1$$37?FE  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory 5-D`<\  
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hibernate.transaction.manager_loopup_class = 8zdT9y|Ig  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect KNg8HYFW\