hibernate连接池

1．Hibernate默认连接池 5
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<!DOCTYPE hibernate-configuration R /iB  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" ^?w6  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> NkA|T1w7  
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<!-- 连接数据库的URL--> 7l%O:M(\  
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<property name="connection.url"> `+{|k)2B  
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jdbc:mysql://localhost:3306/schoolproject ^0c:ro  
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<property name="connection.useUnicode">true</property> cea%M3  
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<property name="connection.characterEncoding">UTF-8</property> yIOoVi\m  
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<!--连接的登录名--> ze{  
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<property name="connection.username">root</property> tFO86 !ln  
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<!--是否将运行期生成的SQL输出到日志以供调试--> $x)C_WZj?  
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<!--指定连接的语言--> z%<Z#5_N  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> 2<y!3OeN  
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<!--映射Student这个资源--> RbM`"wrZ  
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2．C3P0连接配置 j|N;&s`  
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<property name="connection.url"> Hpo7diBE  
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jdbc:mysql://localhost:3306/schoolproject ZJlmHlAX  
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<property name="connection.useUnicode">true</property> yqi=9NB  
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<property name="connection.characterEncoding">UTF-8</property> 5Arx"=c  
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<property name="connection.password"></property> 
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<property name="hibernate.c3p0.max_size">20</property> )xwWig.  
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<property name="hibernate.c3p0.min_size">5</property> 7v\K,P8  
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<property name="hibernate.c3p0.timeout">120</property> YbjeM6#E  
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<property name="hibernate.c3p0.max_statements">100</property> s2s}5b3  
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<property name="hibernate.c3p0.idle_test_period">120</property> 4|i.b?"  
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<property name="hibernate.c3p0.acquire_increment">2</property> ?+EN.P[;3  
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3．proxool连接池 r2,AZ+4FP  
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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 OFS`?>  
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<driver-url> 'MEO?]Tf.^  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 q!l[^t|;  
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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 Q+4
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收,超时的销毁--> HRF4 Ro  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> 9HI9([Cs  
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<maximum-new-connections>20</maximum-new-connections> h[c HCVM:  
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等待请求数由maximum-new-connections决定--> 38P_wf~\  
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<minimum-connection-count>10</minimum-connection-count> rnxO2   
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(2)配置hibernate.cfg.xml文件 fTM^:vkO  
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<property name="hibernate.connection.provider_class"> NW
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<property name="hibernate.proxool.pool_alias">DBPool</property> e*vSGT$KgL  
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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 zy@ #R;  
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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 _F^|n}Qbj  
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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。 Jb$PlOQ  
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(4) dialect是声明ＳＱＬ语句的方言 "_
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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。 GLc+`,.  
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(6) <mapping >资源文件映射 scL7PxJ5  
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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： ]RnX'yw^  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 RW
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory oF V9t{~j  
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