hibernate连接池

1．Hibernate默认连接池 %KLpig  
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<?xml version='1.0' encoding='UTF-8'?>  qi^7  
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<!DOCTYPE hibernate-configuration HAa;hb  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" c24dSNJg,  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> yd d7I&$  
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<property name="connection.url"> bKMy|_  
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jdbc:mysql://localhost:3306/schoolproject {'NvG  
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<property name="connection.useUnicode">true</property> M/"I2m   
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<property name="connection.characterEncoding">UTF-8</property> u. F9g #  
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<property name="connection.username">root</property> |v3T!  
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<property name="connection.password"></property> Ng2twfSl$  
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<!--是否将运行期生成的SQL输出到日志以供调试--> Ga^"1TZ x  
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<property name="show_sql">true</property> )q8pk2  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property>  UD2C>1j  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> he;dq)-e9  
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</session-factory> P~>OS5^  
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2．C3P0连接配置 /K@XzwM  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> =7=]{Cx[  
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<property name="connection.url"> Xx~Bp+  
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jdbc:mysql://localhost:3306/schoolproject &-)N'  
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<property name="connection.useUnicode">true</property> Hk3sI-XkA  
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<property name="connection.username">root</property> >y7?-*0  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider IHac:=*Q  
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<property name="hibernate.c3p0.max_size">20</property> YK'<NE3 4  
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<property name="hibernate.c3p0.min_size">5</property> U%QI a TN*  
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<property name="hibernate.c3p0.timeout">120</property> zTSTEOP}%Y  
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<property name="hibernate.c3p0.max_statements">100</property> k="i;! Ge  
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<property name="hibernate.c3p0.idle_test_period">120</property> |u<7?)mp  
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<property name="hibernate.c3p0.acquire_increment">2</property> N~)_DjQP5  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> %P|/A+Mg"  
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3．proxool连接池 x7[BK_SY  
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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 /PIcqg  
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Anything outside the "proxool" tag is ignored. --> S<Xf>-8w  
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<proxool> FQ\h4` >B  
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<alias>DBPool</alias> _oeS Uzq.  
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<driver-url> S?2
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<driver-class>com.mysql.jdbc.Driver</driver-class> h/Y'<:  
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<driver-properties> c7H^$_^=  
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<property name="user" value="root"/> `Urhy#LC  
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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 VUuE T  
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收,超时的销毁--> f _:A0  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> <F'\lA9  
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<maximum-new-connections>20</maximum-new-connections> :Hbv)tS\3w  
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<prototype-count>5</prototype-count> 3OB"#Ap8<  
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等待请求数由maximum-new-connections决定--> [#iz/q~}  
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<maximum-connection-count>100</maximum-connection-count> 5mR 1@  
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<minimum-connection-count>10</minimum-connection-count> XK vi=0B  
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(2)配置hibernate.cfg.xml文件 r
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<property name="hibernate.connection.provider_class"> cc34e  
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<property name="hibernate.proxool.pool_alias">DBPool</property> DV{=n C  
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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 Np)lI
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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 &~w}_Fjk  
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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。 yppo6HGD  
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(4) dialect是声明ＳＱＬ语句的方言 {_dvx*M  
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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。 |)G<,FJQE_  

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(6) <mapping >资源文件映射 w*MpX U<  
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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： }d }lR  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 :j`sr  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory Y4(  
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hibernate.transaction.manager_loopup_class = [fIg{Q  
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