hibernate连接池

1．Hibernate默认连接池 ff:&MsA|,  
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<!DOCTYPE hibernate-configuration ,:L}S03k  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" <&+l;z  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> mIr{Wocx  
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<property name="connection.url"> 3]c<7vdl  
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jdbc:mysql://localhost:3306/schoolproject Ws1<Jt3/."  
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<property name="connection.useUnicode">true</property> <B`=oO%o  
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<property name="connection.characterEncoding">UTF-8</property> O~t5qnu/}  
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<property name="connection.username">root</property> o#+!H!C.O  
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<property name="show_sql">true</property> u_Q3v9  
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<!--映射Student这个资源--> -m+2l`DLy  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> rgP$\xn-  
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</session-factory> 2cmqtlW"  
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2．C3P0连接配置 ^iI^)  
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<!DOCTYPE hibernate-configuration N.&K"J  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> !W3Le$aL  
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<property name="connection.url"> HQE#O4  
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<property name="connection.useUnicode">true</property> .&[nS<~`  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider -,i1T(p1  
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<property name="hibernate.c3p0.max_size">20</property> nnE@1X3  
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<property name="hibernate.c3p0.min_size">5</property> sVC5<?OW!p  
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<property name="hibernate.c3p0.timeout">120</property> F1+2V"~  

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<property name="hibernate.c3p0.max_statements">100</property> P_?1Rwm-45  
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<property name="hibernate.c3p0.idle_test_period">120</property> PCU6E9~t2  
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<property name="hibernate.c3p0.acquire_increment">2</property> QHQj6]
 
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property>  /!9949XV  
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</hibernate-configuration> SZ0Zi\W  
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3．proxool连接池 lz>5bR'  
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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 _&:o"""Wf  
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Anything outside the "proxool" tag is ignored. --> 1'd "O @  
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<proxool> ({8Q=Gh  
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<alias>DBPool</alias> %d=-<EQ|&  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 &B3kzs  
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<driver-class>com.mysql.jdbc.Driver</driver-class> ~fgv7=(!  
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<property name="user" value="root"/> ElYHA  
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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 (*2"dd  
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收,超时的销毁--> :bh[6F  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> 6HEl1FK{@  
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<maximum-new-connections>20</maximum-new-connections> *yJb4uALB  
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<prototype-count>5</prototype-count> IAtZ-cM<  
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等待请求数由maximum-new-connections决定--> N1SRnJu<f  
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<maximum-connection-count>100</maximum-connection-count> v<-D>iJ  
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<minimum-connection-count>10</minimum-connection-count> %?cPqRHJ ~  
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(2)配置hibernate.cfg.xml文件 nd?m+C&W  
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<!DOCTYPE hibernate-configuration w(@`g/b  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" vuK 5DG4  
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<property name="hibernate.connection.provider_class"> cbIW>IbM  
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<property name="hibernate.proxool.pool_alias">DBPool</property> 1HZexV  
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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 O 8fh'
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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 yf$7<gwX  
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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。 8Ej2JMc  
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(4) dialect是声明ＳＱＬ语句的方言 BvYJ!Vj  
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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。 UR\*KR;yM  

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(6) <mapping >资源文件映射 c2y5[L7?  
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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： t &ucqY  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 ](O!6_'d  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory 7<) .luV  
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hibernate.transaction.manager_loopup_class = m3,v&Z  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect X-%*`XG'