hibernate连接池

1．Hibernate默认连接池 G& cm5  
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<!DOCTYPE hibernate-configuration A?|KA<&m#u  
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<!?JDBC驱动程序--> G%S=K2v  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> Fzh%#z0  
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<!-- 连接数据库的URL--> VE4!=4  
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<property name="connection.url"> 'cy35M  
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jdbc:mysql://localhost:3306/schoolproject O7ceSz  
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<property name="connection.useUnicode">true</property> uljd)kLy4O  
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<property name="connection.characterEncoding">UTF-8</property> Sd' uXX@  
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<!--连接的登录名--> QXishHk&  
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<property name="connection.username">root</property> f3lFpS  
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<property name="connection.password"></property> 8wwqV{O7  
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<property name="show_sql">true</property> [|d:QFx  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> )b"H]"  
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<!--映射Student这个资源--> N/DcaHFYo  
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2．C3P0连接配置 A`Z!=og=  
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<!DOCTYPE hibernate-configuration Tc,Bv7:  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> O4$ra;UM`  
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<property name="connection.url"> xAYC%)  
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jdbc:mysql://localhost:3306/schoolproject Pg-~^"?y  
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<property name="connection.useUnicode">true</property> ^5qX+!3r{  
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<property name="connection.characterEncoding">UTF-8</property> AT<gV/1l  
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<property name="connection.username">root</property> s!~M,zsQN  
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<!-- C3P0连接池设定--> U/>f" F  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider T3[\;ib}  
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<property name="hibernate.c3p0.max_size">20</property> }pbyC  
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<property name="hibernate.c3p0.min_size">5</property> 5`{+y]  
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<property name="hibernate.c3p0.timeout">120</property> [`_&d7{-4b  
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<property name="hibernate.c3p0.max_statements">100</property> /,"Z^=  
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<property name="hibernate.c3p0.idle_test_period">120</property> ?cG+rC%  
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<property name="hibernate.c3p0.acquire_increment">2</property> Dw%>y93V  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> jZ7/p^c5R  
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3．proxool连接池 pco~Z{n  
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(1) 先写proxool的配置文件，文件名：proxool.xml（一般放在与hibernate.cfg.xml文件在同一个目录中）本例配置的是MYSQL数据库，数据库的名字为schoolproject iVd*62$@$  
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Anything outside the "proxool" tag is ignored. --> 6.6~w\fR8  
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<alias>DBPool</alias> b5_A*-s$M  
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<driver-url> Q0gO1T  
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<driver-class>com.mysql.jdbc.Driver</driver-class> k!xi (l<C  
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<driver-properties> 8doT`rI1  
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<property name="user" value="root"/> .Y&_k  
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<!-- proxool自动侦察各个连接状态的时间间隔(毫秒),侦察到空闲的连接就马上回 Ufv{6"sH  
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收,超时的销毁--> Q~,E K  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> !.+iA=K{  
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<maximum-new-connections>20</maximum-new-connections> (*/P~$xIj  
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等待请求数由maximum-new-connections决定--> ZZ!d:1'7  
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(2)配置hibernate.cfg.xml文件 VEpIAC4  
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<property name="hibernate.connection.provider_class"> GS8,mQ8l*l  
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org.hibernate.connection.ProxoolConnectionProvider Qyt6+xL  
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<property name="hibernate.proxool.pool_alias">DBPool</property> pm5Yc@D  
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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 yQou8
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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 }pTw$B  
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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。 g](m& O  
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(4) dialect是声明ＳＱＬ语句的方言 #GWQ]r?  
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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。 KxJJ?WyM  
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(6) <mapping >资源文件映射 Sn0?_vH4  
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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： >V;<K?5B`W  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 n>#h(  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory [K"v)B'  
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hibernate.transaction.manager_loopup_class = /JveN8L%  
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org.hibernate.transaction.JBossTransactionManagerLookup /f0_mi,bD  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect NA0hQGN}