hibernate连接池

1．Hibernate默认连接池 wM[Z
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<?xml version='1.0' encoding='UTF-8'?> =LIb0TZ2  
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<!DOCTYPE hibernate-configuration bn|HvLQ"1  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" Ndl{f=sjX-  
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<hibernate-configuration> D"$ 97  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> o_=4Ex "  
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<property name="connection.url"> ]O:u9If  
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jdbc:mysql://localhost:3306/schoolproject ?/T=Gk  
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<property name="connection.useUnicode">true</property> eu)""l  
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<property name="connection.characterEncoding">UTF-8</property> kLF3s#k  
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<property name="connection.username">root</property> 2s,cyCw&  
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<property name="connection.password"></property> I m-M2n  
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<property name="show_sql">true</property> 4W
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> Z$c&Y>@)  
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<!--映射Student这个资源--> /Dc54Un  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> R)N^j'R~=  
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2．C3P0连接配置 w(S&X"~  
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<?xml version='1.0' encoding='UTF-8'?> 1x/R  
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<!DOCTYPE hibernate-configuration HnFH|H<Uf  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" L{;Q6_m  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> &.yX41R  
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<property name="connection.url"> ?qHQ#0 @y]  
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jdbc:mysql://localhost:3306/schoolproject S}Z@g  
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<property name="connection.useUnicode">true</property> xrNe:Aj  
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<property name="connection.characterEncoding">UTF-8</property> n^55G>"0|  
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<property name="connection.password"></property> /-^{$$eu  
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<!-- C3P0连接池设定--> KdTWi;mV2-  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider !xg10N}I  
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<property name="hibernate.c3p0.max_size">20</property> _D+J3d(Pjk  
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<property name="hibernate.c3p0.min_size">5</property> `4Z:qh+fJ  
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<property name="hibernate.c3p0.timeout">120</property> QR-pji y  
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<property name="hibernate.c3p0.max_statements">100</property> Lcy6G%A  
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<property name="hibernate.c3p0.idle_test_period">120</property> eAQ-r\h'2  
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<property name="hibernate.c3p0.acquire_increment">2</property> |hDN$By  
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<property name="show_sql">true</property> ]haQ#e}WH  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> d,'gh4C  
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3．proxool连接池 h]Gvt 5  
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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 Kb/qM}jS  
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Anything outside the "proxool" tag is ignored. --> %w!x \UV  
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<proxool> ).tTDZ   
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<alias>DBPool</alias>  z'5  
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<driver-url> 3r?T|>|  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 y"_rDj`  
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<driver-class>com.mysql.jdbc.Driver</driver-class> Iq{/-,v  
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<property name="user" value="root"/> *oh,Va  
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收,超时的销毁--> T.WN9=N  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> {Q^ -  
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<maximum-new-connections>20</maximum-new-connections> oRmA\R*  
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等待请求数由maximum-new-connections决定--> , LqfwA|  
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<maximum-connection-count>100</maximum-connection-count> @~i :8  
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(2)配置hibernate.cfg.xml文件 tR?)C=4,  
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<!DOCTYPE hibernate-configuration L~Xzo  
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<property name="hibernate.connection.provider_class"> FMl_I26]  
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<property name="hibernate.proxool.pool_alias">DBPool</property> af=lzKt*  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> "l(<<Ha/  

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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 KWn.  
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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 a=*JyZ.2  
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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。 F7`[r9 $  
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(4) dialect是声明ＳＱＬ语句的方言 PLK
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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。 (5)DQ1LaF  
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(6) <mapping >资源文件映射 ]fU0;jzX  
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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： .QDeS|l  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 R7Z!  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory v3r<k
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hibernate.transaction.manager_loopup_class = o#V{mm,{Pm  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect :a)`iJn
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