hibernate连接池

1．Hibernate默认连接池
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<!DOCTYPE hibernate-configuration 4v9z
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> qKt8sxg  
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<property name="connection.url"> Mf7Q+_!  
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<property name="connection.username">root</property> 6g4CUP'Y  
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2．C3P0连接配置 -cyJjLL*  
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<property name="connection.username">root</property> zF)_t S  
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<property name="hibernate.c3p0.max_size">20</property> -vjjcyTt  
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<property name="hibernate.c3p0.timeout">120</property> ni%^w(J3Q  
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<property name="hibernate.c3p0.max_statements">100</property> zLxWyPM0;  
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<property name="hibernate.c3p0.idle_test_period">120</property> HNh=ig
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<property name="hibernate.c3p0.acquire_increment">2</property> -w@fd]g  
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3．proxool连接池 dT|z)-Z`  
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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"BTu-I  
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<proxool> 3jn@ [ m  
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<alias>DBPool</alias> woT"9
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<driver-class>com.mysql.jdbc.Driver</driver-class> |HU qqlf  
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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 MELGTP>  
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收,超时的销毁--> PJYA5"}W  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> 4d 3Znpf  
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<maximum-new-connections>20</maximum-new-connections> ;a3nH  
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等待请求数由maximum-new-connections决定--> Kyp0SZp[  
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(2)配置hibernate.cfg.xml文件 .W :  
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<property name="hibernate.proxool.pool_alias">DBPool</property> @VC .>  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> DB`$Ru@  
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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 }]AT _bh,  
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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 V0K16#}1gM  
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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。 >+cSPN'i>  
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(4) dialect是声明ＳＱＬ语句的方言 wfgqgPo!v  
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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{S:X:X  
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(6) <mapping >资源文件映射 Ju!(gh  
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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： TZ[Zm  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 bEm7QgV{X  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory +`@M*kd  
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hibernate.transaction.manager_loopup_class = |EKu2We*  
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org.hibernate.transaction.JBossTransactionManagerLookup {~SaRB2<'  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect "(v%1tGk