hibernate连接池

1．Hibernate默认连接池 Kj#h9e  
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<?xml version='1.0' encoding='UTF-8'?>
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<!DOCTYPE hibernate-configuration s"X0Jx}
 
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> /X?%K't2r  
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<!-- 连接数据库的URL--> @mEB=X(-l=  
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<property name="connection.url"> (YHK,aC>u  
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jdbc:mysql://localhost:3306/schoolproject @Pf['BF"  
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<property name="connection.useUnicode">true</property> {N@tJ,Fh{  
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<property name="connection.characterEncoding">UTF-8</property> ~oeX0l>F  
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<!--连接的登录名--> l:s
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<property name="connection.username">root</property> -Vj112 fI  
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<property name="connection.password"></property> sb</-']a  
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<!--是否将运行期生成的SQL输出到日志以供调试--> OdtS5:L  
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<property name="show_sql">true</property> 9+:<RFJ  
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<!--指定连接的语言--> >C}KSyV;  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> d>x(Bj6  
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<!--映射Student这个资源--> u$+nl~p[&  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> ?wMS[Kj  
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</session-factory> "Fqrk>Q~  
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2．C3P0连接配置 tdn|mX#  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" jW]Fx:mQi  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> ^-7-jZ@jz  
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<!-- 连接数据库的URL--> >TS=tK  
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<property name="connection.url"> !9EbG  
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jdbc:mysql://localhost:3306/schoolproject pcPRkYT[M  
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<property name="connection.useUnicode">true</property> 'z">4{5  
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<property name="connection.characterEncoding">UTF-8</property> ]H=P(Z-  
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<property name="connection.username">root</property> K?,`gCN}v  
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<property name="connection.password"></property> /5C>7BC  
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<!-- C3P0连接池设定--> 8YkCTJfBGu  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider mJS-x-@  
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<property name="hibernate.c3p0.max_size">20</property> &A
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<property name="hibernate.c3p0.min_size">5</property> ^uIKwql  
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<property name="hibernate.c3p0.timeout">120</property> 0coRar?+b  
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<property name="hibernate.c3p0.max_statements">100</property> wm/>_  
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<property name="hibernate.c3p0.idle_test_period">120</property> )LE#SGJP  
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<property name="hibernate.c3p0.acquire_increment">2</property> @wW)#!Mou  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> 4t0-L]v4.*  
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<!--映射Student这个资源--> ;q" ,Bs  
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3．proxool连接池 ?[S{kMb2  
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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 6Pu5 k;H  
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Anything outside the "proxool" tag is ignored. --> qf6}\0   
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<proxool> XW9 [VUW~  
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<alias>DBPool</alias> [P"R+$"   
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<!--proxool只能管理由自己产生的连接--> oFUP`p%[  
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<driver-url> 9:jZ3U  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 Ok2>%e  
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<driver-class>com.mysql.jdbc.Driver</driver-class> !t92_y3  
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<driver-properties> :ift{XR'  
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<property name="user" value="root"/> 4`+hX'  
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收,超时的销毁--> l+1GA0'JP  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> 7`f',ZK%  
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<maximum-new-connections>20</maximum-new-connections> h&6v&%S/L  
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等待请求数由maximum-new-connections决定--> \kGi5G]  
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<minimum-connection-count>10</minimum-connection-count> ,??%["R  
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(2)配置hibernate.cfg.xml文件 I(dMiL  
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<!DOCTYPE hibernate-configuration |E)Es!dr  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" xNh#=6__9  
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<property name="hibernate.connection.provider_class"> jy] hP?QG  
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org.hibernate.connection.ProxoolConnectionProvider wr=h=vXU[  
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<property name="hibernate.proxool.pool_alias">DBPool</property> wR?M2*ri   
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> ,))UQ7N  
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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
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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 SzR0Mu3uK  
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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。 Sq&*K9:z  
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(4) dialect是声明ＳＱＬ语句的方言 cWl)ZE<hM  
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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。 I?v)>||Q  
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(6) <mapping >资源文件映射 Bo?uwi  
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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： X6~y+R  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 Jp.Sow  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory Z&=K+P  
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hibernate.transaction.manager_loopup_class = L`YnrDZK  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect 4@|K^nT`