hibernate连接池

1．Hibernate默认连接池 IN^_BKQt  
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<!DOCTYPE hibernate-configuration GuO`jz F  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> 1V%'.l9  
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<!-- 连接数据库的URL--> ]W) jmw'mo  
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<property name="connection.url"> HFS
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jdbc:mysql://localhost:3306/schoolproject Jps .;yjk  
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<property name="connection.useUnicode">true</property> @J vZ[T/  
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<property name="connection.characterEncoding">UTF-8</property> S()Za@ [a$  
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<property name="connection.username">root</property> zk=\lp2  
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<property name="connection.password"></property> *gu8-7'  
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<!--是否将运行期生成的SQL输出到日志以供调试--> JSW&rn  
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<property name="show_sql">true</property> \G;CQV#{9  
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<!--指定连接的语言--> vJCf~'  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> b!a %YLL  
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<!--映射Student这个资源--> PXEKV0y  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> GGE[{Gb9  
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</session-factory> b5 Q NEi  
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2．C3P0连接配置 }kPVtSQ  
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<!DOCTYPE hibernate-configuration wkikD  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" >saI+u'o  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> e1P7 .n}  
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<!-- 连接数据库的URL--> e&3#2
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<property name="connection.url"> 0<&M?^  
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jdbc:mysql://localhost:3306/schoolproject jG8;]XP  
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</property> PU+1=%'V  
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<property name="connection.useUnicode">true</property> :qnokrGzB  
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<property name="connection.characterEncoding">UTF-8</property> h{/ve`F>@  
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<property name="connection.username">root</property> 1Z:R,\+L  
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<property name="connection.password"></property> (1 yGg==W.  
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<!-- C3P0连接池设定--> ':sT
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider ;[~^(. f  
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<property name="hibernate.c3p0.max_size">20</property> Omb.53+  
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<property name="hibernate.c3p0.min_size">5</property> 4\1;A`2%0  
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<property name="hibernate.c3p0.timeout">120</property> o^PuhVu  
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<property name="hibernate.c3p0.max_statements">100</property> u _X}-U  
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<property name="hibernate.c3p0.idle_test_period">120</property> ?cxr%`E  
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<property name="hibernate.c3p0.acquire_increment">2</property> ' =}pxyg  
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<property name="show_sql">true</property> LYNZP4(R  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> ol#yjrv  
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</session-factory> 
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3．proxool连接池 sy=dY@W^  
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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 i=V-@|Z  
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<?xml version="1.0" encoding="UTF-8"?> k|5k8CRX  
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<!-- the proxool configuration can be embedded within your own application's. I<KCt2:X  
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Anything outside the "proxool" tag is ignored. --> V4Qz*z%  
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<proxool> q6Rw4  
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<alias>DBPool</alias> "5y<G:$+~  
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<driver-url> >r~|1kQ.  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 |Cu1uwy  
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<driver-class>com.mysql.jdbc.Driver</driver-class> @::lJDGVv  
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<driver-properties> BL7>dZOa  
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<property name="user" value="root"/> ?,!uA)({n
 
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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 ykJ+%gla  
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收,超时的销毁--> vs*>onCf  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> ?U=mcdqd  
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用户连接就不会被接受--> U<K|jsFo  
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<maximum-new-connections>20</maximum-new-connections> w{RNv%hJ$=  
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<prototype-count>5</prototype-count> 8}Fw%;Cb  
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等待请求数由maximum-new-connections决定--> ?ykVfO'  
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<maximum-connection-count>100</maximum-connection-count> ZD$-V3e`  
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<minimum-connection-count>10</minimum-connection-count> 1EKcD^U,  
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(2)配置hibernate.cfg.xml文件 }CB=c]p  
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<!DOCTYPE hibernate-configuration qat45O4A1  
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<property name="hibernate.connection.provider_class"> 3iwoMrp  
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<property name="hibernate.proxool.pool_alias">DBPool</property> teQaHe#  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> NIWI6qCw  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> AK*mcTr  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" />
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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 kj<D4)  
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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 iuU3*yyn  
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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。 <p L;
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(4) dialect是声明ＳＱＬ语句的方言 ~d#;r5>  
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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。 Z9 q{r s  
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(6) <mapping >资源文件映射 Vf,~MG  
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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：
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 XB!`*vZ/<  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory O.up%'%,  
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hibernate.transaction.manager_loopup_class = I}G}+0geV  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect Z564K7IV