hibernate连接池

1．Hibernate默认连接池 j#0JD!Vr  
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<!DOCTYPE hibernate-configuration =*1NVi $n  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" Lw2VdFi>E&  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> ]IEZ?+F,  
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<!-- 连接数据库的URL--> ^GyZycch  
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<property name="connection.url"> em'ADRxG+  
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jdbc:mysql://localhost:3306/schoolproject \5 rJ  
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<property name="connection.useUnicode">true</property> iGkysU<wcp  
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<property name="connection.characterEncoding">UTF-8</property> x x4GP2  
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<property name="connection.username">root</property> /-,\$@J
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<property name="show_sql">true</property> !3Pbu=(cte  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> a5GLbanF  
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2．C3P0连接配置 u}gavG l  
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<!DOCTYPE hibernate-configuration NOuG#P  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> /v8Q17O?e  
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<!-- 连接数据库的URL--> Y~-y\l;Tr  
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<property name="connection.url"> UtQey ;w  
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jdbc:mysql://localhost:3306/schoolproject >sfg`4  
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</property> )rD!4"8/A  
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<property name="connection.useUnicode">true</property> r8J7zTD&
 
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<property name="connection.characterEncoding">UTF-8</property> hTr5Q33y>  
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<property name="connection.username">root</property> ,erf{"Nh  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider 6lSz/V;  
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<property name="hibernate.c3p0.max_size">20</property> xc:E>-  
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<property name="hibernate.c3p0.min_size">5</property> 9CY{}g  
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<property name="hibernate.c3p0.timeout">120</property> YAr6cl  
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<property name="hibernate.c3p0.max_statements">100</property> *1b|j|5v  
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<property name="hibernate.c3p0.idle_test_period">120</property> ;*<tU n^t  
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<property name="hibernate.c3p0.acquire_increment">2</property> 4wl1hp>,  
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<property name="show_sql">true</property> tS'lJu  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> sgX!4wG&Z  
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3．proxool连接池 "O&93#8  
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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 U0~_'&Fe  
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Anything outside the "proxool" tag is ignored. --> `fu_){  
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<proxool> y+k_&ss  
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<alias>DBPool</alias> *]6g-E?:@  
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<driver-url> 9BCW2@Kp  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 >rSjP1-F  
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<driver-class>com.mysql.jdbc.Driver</driver-class> eA/n.V$z  
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<driver-properties> ~6[?=mOi'  
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<property name="user" value="root"/> &OMlW_FHR  
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<!-- proxool自动侦察各个连接状态的时间间隔(毫秒),侦察到空闲的连接就马上回 4ot<Uw5  
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收,超时的销毁--> ?|nl93m  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> MqyjTY::Xg  
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<maximum-new-connections>20</maximum-new-connections> ewDYu=`*  
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等待请求数由maximum-new-connections决定--> BI'>\hX/V  
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<maximum-connection-count>100</maximum-connection-count> LC%ococ  
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<minimum-connection-count>10</minimum-connection-count> @HT\Y%E  
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(2)配置hibernate.cfg.xml文件 O<u=Vz3c~0  
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<!DOCTYPE hibernate-configuration ]\,?u /  
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<property name="hibernate.connection.provider_class"> m`yvZ4K!  
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<property name="hibernate.proxool.pool_alias">DBPool</property> "?" :  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> ~i,d%a  
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(1) hibernate.connection.provider_class定义Hibernate的连接加载类，这里Proxool连接池是用这个，不同的连接池有不同的加载类，可以查阅Hibernate文档获取相关信息 7%h;To-<6  
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(2) hibernate.proxool.pool_alias这里就是用我们上面提到的连接池的别名 0\mf1{$"!7  
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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。 v
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(4) dialect是声明ＳＱＬ语句的方言 z~{08M7  
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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。 MN: {,#d0  
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(6) <mapping >资源文件映射 /_{-~0Z=@B  
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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： rCJ$Pl9R  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 F:zmO5L5  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory PqspoH 0OI  
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hibernate.transaction.manager_loopup_class = kEh9J>|M  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect fR1LVLU