hibernate连接池

1．Hibernate默认连接池 _Jt  
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<!DOCTYPE hibernate-configuration qdCcMcGt  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> b0|;v-v  
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<property name="connection.url"> o)2KQ$b>Q  
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jdbc:mysql://localhost:3306/schoolproject zg>)Lq|VsT  
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<property name="connection.useUnicode">true</property> oniVC',  
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<property name="connection.characterEncoding">UTF-8</property> ]#sF pWI[N  
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<!--连接的登录名--> t6C2DHh7$  
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<property name="connection.username">root</property> [X"pOz  
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<property name="connection.password"></property> dJ(<zz+;b  
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<!--是否将运行期生成的SQL输出到日志以供调试--> Q)[DSM  
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<property name="show_sql">true</property> ]tx/t^&/\u  
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<!--指定连接的语言--> $n=w  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> (Go1@;5I  
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<!--映射Student这个资源--> ^JMO POm  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> 6>NK2} `  
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2．C3P0连接配置 (.pi,+Ws  
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"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> ('z:XW96  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> 4TRF-f  

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<property name="connection.url"> 43,baeG  
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jdbc:mysql://localhost:3306/schoolproject tGJJ|mle>  
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<property name="connection.useUnicode">true</property> &~:+2  
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<property name="connection.characterEncoding">UTF-8</property> }R!t/8K  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider RiZ)#0  
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<property name="hibernate.c3p0.max_size">20</property> K'f^=bcI  
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<property name="hibernate.c3p0.min_size">5</property> SLz;5%CPV  
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<property name="hibernate.c3p0.timeout">120</property> hkOFPt&  
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<property name="hibernate.c3p0.max_statements">100</property> _jb&=f8  
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<property name="hibernate.c3p0.idle_test_period">120</property> 4Uhh]/  
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<property name="hibernate.c3p0.acquire_increment">2</property> 2UG>(R:  
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<!--映射Student这个资源--> A;k#8&;  

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3．proxool连接池 X|yVRQ?F`  
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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 _S,UpR~2W  
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Anything outside the "proxool" tag is ignored. --> ^Rtxef  
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<alias>DBPool</alias> w}s5=>QG%  
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<driver-url> lbGPy'h<rt  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 ?mF:L"i  
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<driver-class>com.mysql.jdbc.Driver</driver-class> -zWNQp$  
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<driver-properties> C$$Zwgy  
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<property name="user" value="root"/> TRJTJM_k  
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收,超时的销毁--> .l|
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> !1K.HdK  
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用户连接就不会被接受--> L,!\PV|  
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<maximum-new-connections>20</maximum-new-connections> Ups0Xg&{  
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等待请求数由maximum-new-connections决定--> ,7 m33Pv*  
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<maximum-connection-count>100</maximum-connection-count> X"mPRnE330  
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(2)配置hibernate.cfg.xml文件 ?"T!<L  
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<!DOCTYPE hibernate-configuration 1
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<property name="hibernate.proxool.pool_alias">DBPool</property> %rf6>  
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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 %F$]v  
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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,<igh  
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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。 YguW2R=6]  
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(4) dialect是声明ＳＱＬ语句的方言 ^5>W`vwp  
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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。 iAPGP-<6  
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(6) <mapping >资源文件映射 `#r/L@QI  
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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： ,6f6r  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 zWhzU|=8  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory (y\.uPu!  
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hibernate.transaction.manager_loopup_class = /?|;f2tbV2  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect Gg:W%&#