hibernate连接池

1．Hibernate默认连接池 j<k6z  
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<?xml version='1.0' encoding='UTF-8'?> y@It#!u0  
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<!DOCTYPE hibernate-configuration _SJ:|I  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" HD/!J9&  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> _B&Lyg!J  
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<!-- 连接数据库的URL--> r[H8;&EL  
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<property name="connection.url"> BP0:<vK{  
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jdbc:mysql://localhost:3306/schoolproject "Y=`w,~~  
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<property name="connection.useUnicode">true</property> #j=yQrJ  
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<property name="connection.characterEncoding">UTF-8</property> Zd-6_,r  
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<!--连接的登录名--> ?1a9k@[t  
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<property name="connection.username">root</property> F_jHi0A  
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<property name="connection.password"></property> ZcQu9XDIt  
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<!--是否将运行期生成的SQL输出到日志以供调试--> So'.QWzX  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
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2．C3P0连接配置 P*OG`%y  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> A iM ukd,  
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<property name="connection.url"> ,PTM'O@aU#  
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jdbc:mysql://localhost:3306/schoolproject ahg:mlaob  
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<property name="connection.useUnicode">true</property> &v{#yzM  
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<property name="connection.characterEncoding">UTF-8</property> 
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<property name="connection.username">root</property> i6'=]f'{  
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<property name="connection.password"></property> [iub}e0  
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<!-- C3P0连接池设定--> cag5w~Px  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider e= IdqkJ%  
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<property name="hibernate.c3p0.max_size">20</property> y2jv84 M  
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<property name="hibernate.c3p0.min_size">5</property> h0tiWHw  
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<property name="hibernate.c3p0.timeout">120</property> )@NFV*@I  
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<property name="hibernate.c3p0.max_statements">100</property> d4S4 e  
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<property name="hibernate.c3p0.idle_test_period">120</property> )QE6X67i  
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<property name="hibernate.c3p0.acquire_increment">2</property> wk|+[Rl;L  
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3．proxool连接池 MB)<@.A0  
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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 wL0[Slf}  
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Anything outside the "proxool" tag is ignored. --> {=GmXd%D  
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<alias>DBPool</alias> <2pp6je\0s  
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<driver-url> RTmp$lV  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 %~Yo{4mHs  
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<driver-class>com.mysql.jdbc.Driver</driver-class> |5~Oh`w  
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<driver-properties> >?^oxB"<Gc  
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<property name="user" value="root"/> |S8$NI2  
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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*y&z'e\  
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收,超时的销毁--> u9"kF  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> W8& )UtWQ  
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用户连接就不会被接受--> -Lq+FTezE  
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<maximum-new-connections>20</maximum-new-connections> %6Gg&Y$j!  
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等待请求数由maximum-new-connections决定--> %"{P?V<-V  
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<maximum-connection-count>100</maximum-connection-count> 9QU\J0c/  
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<minimum-connection-count>10</minimum-connection-count> N:lE{IvRJ  
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(2)配置hibernate.cfg.xml文件 a_Xwi:e<
 
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<!DOCTYPE hibernate-configuration WWpMuB_G  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" Hhtl~2t!0  
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<property name="hibernate.connection.provider_class"> nXn@|J&z~U  
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<property name="hibernate.proxool.pool_alias">DBPool</property> [RXLR#  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> uzHMQp  
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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 f+9eB
  
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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 8=$XhC  
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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。 GeJ}myD O  
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(4) dialect是声明ＳＱＬ语句的方言 `qJJ{<1&U  
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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。 \lG)J0  
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(6) <mapping >资源文件映射 4^r6RS@z  
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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： IM1&g7Qs2  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 [\3ZMH *  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory )Lz =[e  
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hibernate.transaction.manager_loopup_class = A5j?Yts  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect 5Xr})%L