hibernate连接池

1．Hibernate默认连接池 0P;LH3sx  
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<!DOCTYPE hibernate-configuration uME_/S uO  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" 7<X!
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"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> X
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> nrbP3sf*  
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<!-- 连接数据库的URL--> .P ??N  
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<property name="connection.url"> |vxmgX)  
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jdbc:mysql://localhost:3306/schoolproject FRayB VHL  
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<property name="connection.useUnicode">true</property> g3(LDqB'.  
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<property name="connection.characterEncoding">UTF-8</property> ciFqj3JS  
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<property name="connection.username">root</property> a`LkP%  
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<property name="connection.password"></property> j@{dsS:6  
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<!--是否将运行期生成的SQL输出到日志以供调试--> "w__AYHV  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> ?F*I2rt#  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> '~1Zr uO  
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2．C3P0连接配置 s_e*jM1  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" ef/43+F^x  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> 1
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<!-- 连接数据库的URL--> 3i'01z  
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<property name="connection.url"> w0vsdM;G  
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jdbc:mysql://localhost:3306/schoolproject 4jZB%tH  
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</property> 69apTx  

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<property name="connection.useUnicode">true</property> "S*@._   
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<property name="connection.characterEncoding">UTF-8</property> ]cVDXLj$  
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<property name="connection.username">root</property> b;#_?2c  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider sUK|*y  
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<property name="hibernate.c3p0.max_size">20</property> -$I30.#  
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<property name="hibernate.c3p0.min_size">5</property> `~"'\Hw  
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<property name="hibernate.c3p0.timeout">120</property> z@pa;
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<property name="hibernate.c3p0.max_statements">100</property> P8|ANe1 v  
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<property name="hibernate.c3p0.idle_test_period">120</property> u/-EVCHr y  
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<property name="hibernate.c3p0.acquire_increment">2</property> :FtV~^Z  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> JX[]u<h?  
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3．proxool连接池 nGYimRYO  
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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 lqJ92vi6Q  
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<?xml version="1.0" encoding="UTF-8"?> X#JUorGp  
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<!-- the proxool configuration can be embedded within your own application's. K/f-9hE F  
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Anything outside the "proxool" tag is ignored. --> <f8j^  
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<proxool> _80L/92  
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<alias>DBPool</alias> 7kE+9HmfMk  
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<driver-url> pFNU~y'Kf  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 tJ>>cFx  
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<driver-class>com.mysql.jdbc.Driver</driver-class> !'F1Ht  
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<driver-properties> \ Voly  
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<property name="user" value="root"/>
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<property name="password" value=""/> l$9k:#\FD  
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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 K)J_q3qo  
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收,超时的销毁--> ;iKtv+"  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> JP6 Noia  
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<maximum-new-connections>20</maximum-new-connections> l5H5!$3~  
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<prototype-count>5</prototype-count> =&UE67eK,  
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等待请求数由maximum-new-connections决定--> ,(x`zpp _  
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(2)配置hibernate.cfg.xml文件 2H9hN4N  
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<!DOCTYPE hibernate-configuration hizM}d-"C  
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<property name="hibernate.proxool.pool_alias">DBPool</property> 1gBLJ0q  
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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 Ws3z-U>j  
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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 `_)9eGQ  
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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。 %fS1gSfh  
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(4) dialect是声明ＳＱＬ语句的方言 ku*k+4rz  
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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。 ZMMx)}hS  
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(6) <mapping >资源文件映射 }*9F`=%F  
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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： L''VBY"?  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 mB0`>?#i  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory uy"i3xD6-  
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hibernate.transaction.manager_loopup_class = e^~dx}X  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect |j'@no_rv