hibernate连接池

1．Hibernate默认连接池 hh&y2#Io  
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<?xml version='1.0' encoding='UTF-8'?> Bx4GFCdifC  
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<!DOCTYPE hibernate-configuration U^\~{X  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" /vu!5?S  
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<!?JDBC驱动程序--> Lm#d.AD)  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> or`stBx  
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<!-- 连接数据库的URL--> i]pG}SJ  
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<property name="connection.url"> *'-^R9dN.S  
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jdbc:mysql://localhost:3306/schoolproject !@k@7~i  
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<property name="connection.useUnicode">true</property> tb3fz")UC  
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<property name="connection.characterEncoding">UTF-8</property> Ypj)6d  
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<property name="connection.username">root</property> vI}S6-"<  
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<property name="connection.password"></property> 4+,Z'J%\[7  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> 2tm-:CPG  
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2．C3P0连接配置 % ul{nL:  
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<!DOCTYPE hibernate-configuration )0MshgM  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" v};qMceJ  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
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<!-- 连接数据库的URL--> %kFELtx  
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<property name="connection.url"> CVG>[~}(9'  
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jdbc:mysql://localhost:3306/schoolproject f<altz_\q  
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</property> k&iScMgCTH  
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<property name="connection.useUnicode">true</property> 0W%}z}/N  
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<property name="connection.characterEncoding">UTF-8</property> Zbh]SF{3F  
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<property name="connection.username">root</property> $"{3yLg  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider Zj*\"Ol  
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<property name="hibernate.c3p0.max_size">20</property> :jEPu3E:  
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<property name="hibernate.c3p0.timeout">120</property> T[?6[,.  
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<property name="hibernate.c3p0.max_statements">100</property> M2@b
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<property name="hibernate.c3p0.idle_test_period">120</property> M
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<property name="hibernate.c3p0.acquire_increment">2</property> 9}29&O  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> %ZP+zhn}  
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</hibernate-configuration> sZ&G%o  
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3．proxool连接池 =PHIpFIuk  
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(1) 先写proxool的配置文件，文件名：proxool.xml（一般放在与hibernate.cfg.xml文件在同一个目录中）本例配置的是MYSQL数据库，数据库的名字为schoolproject m~hoE8C$  
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Anything outside the "proxool" tag is ignored. --> X+k}2HvNG  
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<proxool> +;}#B~:  
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<alias>DBPool</alias> J?UQJ&!@O  
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<driver-url> ?ULo&P[  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 !2UOC P  
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<driver-class>com.mysql.jdbc.Driver</driver-class> _p-t<ytnh  
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<driver-properties> hN2:d1f0  
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<property name="user" value="root"/> Cv ejb+  
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<property name="password" value=""/> sVk$x:k1M  
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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 h_1T,f(  
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收,超时的销毁--> CC\*?BKj"  

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<house-keeping-sleep-time>90000</house-keeping-sleep-time> mbnV[  
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<maximum-new-connections>20</maximum-new-connections> 1&;QyTN  
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等待请求数由maximum-new-connections决定--> P=3RLL<l  
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<maximum-connection-count>100</maximum-connection-count> %sHF-n5P  
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<minimum-connection-count>10</minimum-connection-count> K=!Bh*  
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(2)配置hibernate.cfg.xml文件 [mEql,x3  
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<!DOCTYPE hibernate-configuration \J+*  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" ,`ZYvF^%  
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<property name="hibernate.connection.provider_class"> .U T@p  
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<property name="hibernate.proxool.pool_alias">DBPool</property> 7^w >Rj  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> pABs!A`N  
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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 -!c"k}N=  
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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 0{#8',*}m?  
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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。 v%f
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(4) dialect是声明ＳＱＬ语句的方言 K~22\G`  
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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。 dDF .qXq.  
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(6) <mapping >资源文件映射 vap,y $C  
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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： ^a#X9  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 g
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory }fKSqB]T-  
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hibernate.transaction.manager_loopup_class = 9'r:~O  
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