hibernate连接池

1．Hibernate默认连接池 Qb@BV&^y&  
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<!DOCTYPE hibernate-configuration Z=0iPy,m>  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" -=@K%\\~5  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> S^*(ALFPj  
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<!-- 连接数据库的URL--> tW'qO:y+  
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<property name="connection.url"> b=6ZdN1  
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<property name="connection.useUnicode">true</property> !H2C9l:rd  
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<property name="connection.characterEncoding">UTF-8</property> 5|{  t+u  
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<property name="connection.username">root</property> %a%+!wX0x  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> J{v6DYhi  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> @idp8J [td  
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2．C3P0连接配置 ?7uStqa  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> clU3#8P!=  
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<property name="connection.url"> sGm(Aax*0  
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jdbc:mysql://localhost:3306/schoolproject @R Yb-d  
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<property name="connection.useUnicode">true</property> . I9] `Q  
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<property name="connection.username">root</property> }R] }@i~i  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider K*i1! "w  
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<property name="hibernate.c3p0.max_size">20</property> |@9I5Eg)iE  
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<property name="hibernate.c3p0.min_size">5</property>
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<property name="hibernate.c3p0.timeout">120</property> 
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<property name="hibernate.c3p0.max_statements">100</property> aI#n+PW  
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<property name="hibernate.c3p0.idle_test_period">120</property> .7^-*HT}  
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<property name="hibernate.c3p0.acquire_increment">2</property> 8 =Lv7G%  
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3．proxool连接池 ,FVy:"FR  
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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 X&8,.=kt"  
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Anything outside the "proxool" tag is ignored. --> 9iNns;^`q  
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<alias>DBPool</alias> 34:EpZO@  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 PlUjjJU  
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<driver-class>com.mysql.jdbc.Driver</driver-class> &Qjl|2  
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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 <LN$[&f#  
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收,超时的销毁--> o+TZUMm  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> K67? d  
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用户连接就不会被接受--> !k9h6/b6  
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<maximum-new-connections>20</maximum-new-connections> C|LQYz-{  
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等待请求数由maximum-new-connections决定--> +to9].O7y  
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(2)配置hibernate.cfg.xml文件 'fFdqsXr  
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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 nB@iQxcz  
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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 >yA,@%X  
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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。 -wRyMY_D  
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(4) dialect是声明ＳＱＬ语句的方言 `\F%l?aY  
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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。 i B!hEbz  
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(6) <mapping >资源文件映射 x\J;ZiWwW  
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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： *)`kx  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 `zzKD2y  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory ( ztim  
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hibernate.transaction.manager_loopup_class = OSa
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