hibernate连接池

1．Hibernate默认连接池 :-U&_%#w  
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<?xml version='1.0' encoding='UTF-8'?> Im-qGB0C  
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<!DOCTYPE hibernate-configuration THX% z `  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" },}g](!m  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> iD%a;]  
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<!-- 连接数据库的URL--> <h+@;/v:  
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<property name="connection.url"> tI^[|@,  
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jdbc:mysql://localhost:3306/schoolproject Wi5Dl=  
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<property name="connection.useUnicode">true</property> ToKG;Ff4b  
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<property name="connection.characterEncoding">UTF-8</property> =d<~
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<!--连接的登录名--> !
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<property name="connection.username">root</property> {*g{9`   
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<property name="connection.password"></property> b{ A/M#=  
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<property name="show_sql">true</property> 65U\;Ew  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> @q>#]8  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> yA*U^:%  
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2．C3P0连接配置 Tj!\SbnA[  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" Pf?&ys6  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> (]&B'1b  
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<property name="connection.url"> i-p,x0th  
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jdbc:mysql://localhost:3306/schoolproject p0l.f
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<property name="connection.useUnicode">true</property> $nIE;idk  
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<property name="connection.username">root</property> <HS{A$]  
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<property name="connection.password"></property> K&gE4;>  
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<!-- C3P0连接池设定--> Qz2jV
 
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider YD9vWk\/  
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<property name="hibernate.c3p0.max_size">20</property> x{So  
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<property name="hibernate.c3p0.timeout">120</property> Eg2jexl
 
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<property name="hibernate.c3p0.max_statements">100</property> v"%>ms"n  
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<property name="hibernate.c3p0.idle_test_period">120</property> Q[H4l({E  
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<property name="hibernate.c3p0.acquire_increment">2</property> O ]-8 %  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> loBW#>  
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3．proxool连接池 LUpkO  
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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 Y(T$k9%}+  
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Anything outside the "proxool" tag is ignored. --> :zO;E+s  
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<proxool> 3(*vZ  
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<alias>DBPool</alias> h*Mi/\  
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<driver-url> or7l}X  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 oJE<}~_k  
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</driver-url> :Z83*SPc  
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<driver-class>com.mysql.jdbc.Driver</driver-class> IkGM~3e  
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<driver-properties> 3lS1WA  
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<property name="user" value="root"/> ^0
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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 aHitPPlq  
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收,超时的销毁--> i"4;{C{s  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> .i#'IS0c  
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用户连接就不会被接受--> }p8iq  
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<maximum-new-connections>20</maximum-new-connections> ,kFp%qNj  
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等待请求数由maximum-new-connections决定--> 'Awd:Aed5  
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<maximum-connection-count>100</maximum-connection-count> <J}JYT  
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<minimum-connection-count>10</minimum-connection-count> %."w]fy>P  
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(2)配置hibernate.cfg.xml文件 fUq #mkq}  
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<!DOCTYPE hibernate-configuration 8rLhOA  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" !R[~Z7b6  
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<property name="hibernate.proxool.pool_alias">DBPool</property> NE|Q0g  
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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 *Xh#W7,<  
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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 CXTtN9N9  
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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。 `r0lu_.$]4  
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(4) dialect是声明ＳＱＬ语句的方言 g`)0 wP  
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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。 Z tc\4  
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(6) <mapping >资源文件映射 $v5 >6+-n  
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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： \~l"  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 35:R
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory d?V/V'T[  
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hibernate.transaction.manager_loopup_class = C 1)+^{7ef  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect 5tEkQ(Ei8