hibernate连接池

1．Hibernate默认连接池 Z:OO|x  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> f:SF&t*  
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<property name="connection.url"> -a[{cu{  
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<property name="connection.useUnicode">true</property> bi[l,  
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<property name="connection.characterEncoding">UTF-8</property> K_aN7?#.v`  
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2．C3P0连接配置 "~<~b2Y"5  
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<property name="connection.url"> D~OhwsL4  
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<property name="connection.useUnicode">true</property> -/c1qLdQ  
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<!-- C3P0连接池设定--> *9Js:z7I  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider "Vp:z V<S  
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<property name="hibernate.c3p0.max_size">20</property> jQeE07g  
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<property name="hibernate.c3p0.min_size">5</property> b%f2"e0g  
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<property name="hibernate.c3p0.timeout">120</property> ((>3,%B`  
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<property name="hibernate.c3p0.max_statements">100</property> {C0^D*U:  
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<property name="hibernate.c3p0.idle_test_period">120</property> Po!JgcJ#\  
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<property name="hibernate.c3p0.acquire_increment">2</property> JvJ!\6Q@  
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3．proxool连接池 `Y({#U  
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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 grfdvN  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 z2nUul(2  
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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 Va/@#=,q]  
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收,超时的销毁--> ^2;(2s  
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等待请求数由maximum-new-connections决定--> rz[uuY7  
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(2)配置hibernate.cfg.xml文件 [N+ m5{tT  
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<property name="hibernate.proxool.pool_alias">DBPool</property> ==h|+NFa  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property>
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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 93W  
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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 y*VQ]aJ  
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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。 AW,v  
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(4) dialect是声明ＳＱＬ语句的方言 ,:#,}w_HyO  

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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。 H&w:`JYDL3  
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(6) <mapping >资源文件映射 GBH_r0  
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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,LU@|  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 ]{f^;y8  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory G(U9rJ9  
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