hibernate连接池

1．Hibernate默认连接池 jEwIn1  
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<!DOCTYPE hibernate-configuration ,,r>,Xq6  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" Bw.i}3UT6  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> 05R@7[GWq  
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<property name="connection.url"> k7^5Bp8=  
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jdbc:mysql://localhost:3306/schoolproject xD7]C|8o  
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<property name="connection.useUnicode">true</property> {RPI]DcO/  
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<property name="connection.characterEncoding">UTF-8</property> iow"n$/  
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<property name="connection.username">root</property> )5H?Vh>36  
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<property name="show_sql">true</property> ; @X<lCk  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> d'ifLQ\  
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<!--映射Student这个资源--> r|Z{-*`  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> ABkl%m6xf  
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2．C3P0连接配置 kT=8e;K  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> 4+i
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<property name="connection.url"> ]f3>-)$*  
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jdbc:mysql://localhost:3306/schoolproject E_`=7i  
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<property name="connection.useUnicode">true</property> =Sv/IXX\di  
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<property name="connection.characterEncoding">UTF-8</property> olcDt&xv]  
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<property name="connection.username">root</property> rs.)CMk53  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider ys~x$  
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<property name="hibernate.c3p0.max_size">20</property> r,udO,Yi=c  
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<property name="hibernate.c3p0.min_size">5</property> /\Ef%@  
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<property name="hibernate.c3p0.timeout">120</property> Zh,71Umz  
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<property name="hibernate.c3p0.max_statements">100</property>
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<property name="hibernate.c3p0.idle_test_period">120</property> N$DkX)Z  
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<property name="hibernate.c3p0.acquire_increment">2</property> g*Ph
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3．proxool连接池 =%7-ZH9  
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(1) 先写proxool的配置文件，文件名：proxool.xml（一般放在与hibernate.cfg.xml文件在同一个目录中）本例配置的是MYSQL数据库，数据库的名字为schoolproject {_}I!`opr$  

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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 U:`Kss`  
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收,超时的销毁--> bOB\--:]  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> do%&m]#;  
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<maximum-new-connections>20</maximum-new-connections> PsYpxNr  
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等待请求数由maximum-new-connections决定--> QY/w  
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(2)配置hibernate.cfg.xml文件 +rd+0 `}C  
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<property name="hibernate.connection.provider_class"> p+eh%2Jm  
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<property name="hibernate.proxool.pool_alias">DBPool</property> aUp g u"
 
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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 23PGq%R  
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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 kVgTGC"L=  
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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。 fhiM U8(&  
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(4) dialect是声明ＳＱＬ语句的方言 Ml_^ `vn  
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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。 <~)P7~$d?p  
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(6) <mapping >资源文件映射 Ud?Q%)X  
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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： _6Sp QW  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 )9g2D`a4  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory (.:e,l{U%  
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hibernate.transaction.manager_loopup_class = /^ts9:  
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