hibernate连接池

1．Hibernate默认连接池 9c#L{in  
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<?xml version='1.0' encoding='UTF-8'?> BASO$?jf4  
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<!DOCTYPE hibernate-configuration ^Z#<tN;  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> P1M|f4*  
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<!-- 连接数据库的URL--> 0b!fWS?,k0  
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<property name="connection.url"> ={e#lC  
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jdbc:mysql://localhost:3306/schoolproject Yqq$kln  
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<property name="connection.useUnicode">true</property> M)bC%(xJ  
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<property name="connection.characterEncoding">UTF-8</property> M$DwQ}Z  
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<!--连接的登录名--> P7M0Ce~iW  
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<property name="connection.username">root</property> 6'3Ey'drH  
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<!--是否将运行期生成的SQL输出到日志以供调试--> -M(58/y  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> [xH2n\7  
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<!--映射Student这个资源--> 2g`uC}  
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2．C3P0连接配置 ./z"P]$
 
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<property name="connection.url"> HhT8YH  
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<property name="connection.useUnicode">true</property> `'{%szmD  
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<property name="connection.username">root</property> J7aK3he  
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<!-- C3P0连接池设定--> ]> "/<"  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider 88LbO(q\d  
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<property name="hibernate.c3p0.max_size">20</property> i1H80m s  
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<property name="hibernate.c3p0.min_size">5</property> o[+|n[aT)3  
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<property name="hibernate.c3p0.timeout">120</property> }(7QJk5 j  
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<property name="hibernate.c3p0.max_statements">100</property> S5JR`o
 
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<property name="hibernate.c3p0.idle_test_period">120</property> [
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3．proxool连接池 [$Bb'],k  
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(1) 先写proxool的配置文件，文件名：proxool.xml（一般放在与hibernate.cfg.xml文件在同一个目录中）本例配置的是MYSQL数据库，数据库的名字为schoolproject H?^#zj`Ex+  
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<driver-url> v|2j~  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 DdO'  
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<driver-class>com.mysql.jdbc.Driver</driver-class> `0D1Nh"%k  
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<property name="user" value="root"/> aB'@8[]z  
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<!-- proxool自动侦察各个连接状态的时间间隔(毫秒),侦察到空闲的连接就马上回 D0i30p`  
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收,超时的销毁--> =rF8[Q0K  
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等待请求数由maximum-new-connections决定--> wP?q5r5  
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(2)配置hibernate.cfg.xml文件 \;gt&*$-  
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<property name="hibernate.connection.provider_class">
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> ~U6YN_W  
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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 }-q`&1!t
 
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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 rjAkpAT  
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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。 LLn{2,jfQ  
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(4) dialect是声明ＳＱＬ语句的方言 "i{_<;p O  
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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。 ]pRfY9w  
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(6) <mapping >资源文件映射 cv*Q]F1%  
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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： 2~&hstd%  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 }L$Xb2^l  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory 3q|cZQK!1  

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hibernate.transaction.manager_loopup_class = jq("D,  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect #mRFUA