hibernate连接池

1．Hibernate默认连接池 7R+(3NU1A  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> IRdt:B|@  
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<property name="connection.url"> )Q)qz$h@  
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jdbc:mysql://localhost:3306/schoolproject ,Q`qnn&  
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<property name="connection.username">root</property> pwUXM?$R  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> [K{{P|(q  
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2．C3P0连接配置 7vRtTP  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> x}G:n[B7_V  
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<property name="connection.url"> |Xt G9A>  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider 1PY]Q{r  
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<property name="hibernate.c3p0.max_size">20</property> =$OGHc  
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<property name="hibernate.c3p0.timeout">120</property> k4Q>J,k  
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<property name="hibernate.c3p0.max_statements">100</property> S]3CRJU3`  
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<property name="hibernate.c3p0.idle_test_period">120</property> `W86]ut[  
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<property name="hibernate.c3p0.acquire_increment">2</property> Q6m8N
 
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3．proxool连接池 4|PWR_x  
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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 WX4sTxJK  
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Anything outside the "proxool" tag is ignored. --> =n,;S W  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 R@WW@ Of  
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<driver-class>com.mysql.jdbc.Driver</driver-class> h%:wIkZ/  
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<property name="user" value="root"/> b<fN,U<k  
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收,超时的销毁--> P)TeF1~T  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> p*P0<01Z  
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<maximum-new-connections>20</maximum-new-connections> B7ys`eiB5C  
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等待请求数由maximum-new-connections决定--> _jb"@TY  
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(2)配置hibernate.cfg.xml文件 z06pX$Q.<  
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<property name="hibernate.connection.provider_class"> #"yf^*wX  
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<property name="hibernate.proxool.pool_alias">DBPool</property> xR&,QrjQG  
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(1) hibernate.connection.provider_class定义Hibernate的连接加载类，这里Proxool连接池是用这个，不同的连接池有不同的加载类，可以查阅Hibernate文档获取相关信息 G]1pGA;  
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(2) hibernate.proxool.pool_alias这里就是用我们上面提到的连接池的别名 ~&:R\  
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(3) hibernate.proxool.xml是向Hibernate声明连接池的配置文件位置，可以用相对或绝对路径，用相对路径时要注意一定在要Path范围内！不然会抛出异常。 >[@d&28b%  
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(4) dialect是声明ＳＱＬ语句的方言 Sh6Cw4 R  
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(5) show_sql定义是否显示Hibernate生成的ＳＱＬ语言，一般在调试阶段设为true,完成后再改成false，这样有利于调试。 Q9>]@DrAx  
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(6) <mapping >资源文件映射 \Agg6tYr  
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4． JNDI连接池，数据源已经由应用服务配置好(如Web服务器)，Hibernate需要做的只是通过JNDI名查找到此数据源。应用服务器将连接池对外显示为JNDI绑定数据源，它是javax.jdbc.Datasource类的一个实例。只要配置一个Hibernate文件，如： se HbwO3 b  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 'e64%t  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory *$C[![  
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hibernate.transaction.manager_loopup_class = QJM!W
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