hibernate连接池

1．Hibernate默认连接池 c^-YcGwa  
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<?xml version='1.0' encoding='UTF-8'?> M.k|bh8  
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<!DOCTYPE hibernate-configuration 8kbBz  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" ,kE=TR.|  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> {c?ymkK  
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<property name="connection.url"> \!7*(&yly  
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jdbc:mysql://localhost:3306/schoolproject uf?b%:A  
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<property name="connection.useUnicode">true</property> }
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<property name="connection.characterEncoding">UTF-8</property> mOSCkp{<e  
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<property name="connection.username">root</property> Fi/jR0]e2  
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<property name="connection.password"></property> J[MVE4&  
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<property name="show_sql">true</property> ;i}i5yv2  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> /jvOXS\M  
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2．C3P0连接配置 6|%^pjX5  
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<!DOCTYPE hibernate-configuration 8f|9W%jt  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" u6S0t?Udap  
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<hibernate-configuration> AZ9\
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> jsaCnm>
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<property name="connection.url"> DMN H?6  
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jdbc:mysql://localhost:3306/schoolproject *`.{K12T  
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<property name="connection.useUnicode">true</property> %ys}Q!gR  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider A'(F%0NF6  
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<property name="hibernate.c3p0.max_size">20</property> Qo *]l_UO;  
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<property name="hibernate.c3p0.min_size">5</property> p;=(-4\V}  
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<property name="hibernate.c3p0.timeout">120</property> ved Qwzh  
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<property name="hibernate.c3p0.max_statements">100</property> Fsj[J
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<property name="hibernate.c3p0.idle_test_period">120</property> o
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3．proxool连接池 t/|^Nt@XT  
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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 4NV1v&"  
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<?xml version="1.0" encoding="UTF-8"?> 9"S3AEI  
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Anything outside the "proxool" tag is ignored. --> 14RL++  
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<proxool> Sgj6tH2M  
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<alias>DBPool</alias> o=ex{g(3  
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<driver-url> n" sGI  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 9V~yK?  
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<driver-class>com.mysql.jdbc.Driver</driver-class> 6*$N@>8&  
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<driver-properties> ; ?!sU  

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<property name="user" value="root"/> ]^!#0(  
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<property name="password" value=""/> Ex<loVIrP$  
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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 B$)KZR(u  
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收,超时的销毁--> 5QlJX  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> %lujme  
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<maximum-new-connections>20</maximum-new-connections> EM"YjC)F  
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等待请求数由maximum-new-connections决定--> }_K7}] 1  
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<minimum-connection-count>10</minimum-connection-count> XJGOX n$/  
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(2)配置hibernate.cfg.xml文件 2}K7(y!?u  
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<property name="hibernate.connection.provider_class"> LY(YgqL  
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<property name="hibernate.proxool.pool_alias">DBPool</property> V4PI~"4q#1  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property>
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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"i(+:la  
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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 K=lm9K  
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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。 ^K[WFiN}  
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(4) dialect是声明ＳＱＬ语句的方言 9)2kjBeb  
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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。 H[oCI|k  
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(6) <mapping >资源文件映射 
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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： kD"BsL*6!  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 {9mXJu$cc  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory ayGYVYi  
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hibernate.transaction.manager_loopup_class = U-h'a: K  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect d;
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