hibernate连接池

1．Hibernate默认连接池 DTp|he  
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<?xml version='1.0' encoding='UTF-8'?> G,JK$j>*l  
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<!DOCTYPE hibernate-configuration Gw0MDV&[  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" ^.; x  
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<!?JDBC驱动程序--> 2$%E:J+2:$  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> \`$RY')9|!  
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<!-- 连接数据库的URL--> 'q9='TOk  
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<property name="connection.url"> K^fH:pV  
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jdbc:mysql://localhost:3306/schoolproject XVNJ
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<property name="connection.useUnicode">true</property> KD)+&69  
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<property name="connection.characterEncoding">UTF-8</property> !JE=QG"  
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<!--连接的登录名--> Z2wgfP`  
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<property name="connection.username">root</property> 35X4] t  
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<property name="connection.password"></property> La
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<!--是否将运行期生成的SQL输出到日志以供调试--> h,WF'X+  
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<property name="show_sql">true</property> A/+bwCDP  
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<!--指定连接的语言--> KsMC+:`F  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> ,@]rvI6x  
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<!--映射Student这个资源--> DHnu F@M  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> @g~hYc  
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</session-factory> hRWRXC9  
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2．C3P0连接配置 hR1n@/nh  
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<!DOCTYPE hibernate-configuration *MBu5 +u%e  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" vQiKpO*  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> 
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<property name="connection.url"> z#!}4@_i3  
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jdbc:mysql://localhost:3306/schoolproject X\a*q]"_  
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</property> *+wGXm  
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<property name="connection.useUnicode">true</property> ^bjaa  
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<property name="connection.characterEncoding">UTF-8</property> IV5B5Q'D  
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<property name="connection.username">root</property> ief~*:5  
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<property name="connection.password"></property> K3WhF  
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<!-- C3P0连接池设定--> =(^-s Jk  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider 0Ek+ }`  
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<property name="hibernate.c3p0.max_size">20</property> dD Zds k+!  
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<property name="hibernate.c3p0.min_size">5</property> ZM~kc|&  
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<property name="hibernate.c3p0.timeout">120</property> yl=_ /'*  
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<property name="hibernate.c3p0.max_statements">100</property> E_[)z%&n2  
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<property name="hibernate.c3p0.idle_test_period">120</property> 4KkjBP
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<property name="hibernate.c3p0.acquire_increment">2</property> [9:'v@Ph  
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<property name="show_sql">true</property> 2'38(wXn#  
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<!--指定连接的语言--> */|Vyp-  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> kYVn4Wq  
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<!--映射Student这个资源--> eoC@b/F4  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> y$]gmg  
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</session-factory> @Y~R*^n"}  
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</hibernate-configuration> !&3iZQGWv  
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3．proxool连接池 h27awO Q  
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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 TH`zp]0  
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<?xml version="1.0" encoding="UTF-8"?> Ls<.&3X2  
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<!-- the proxool configuration can be embedded within your own application's. RW!_ZzZ  
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Anything outside the "proxool" tag is ignored. --> ),<E-Ub  
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<proxool> nj (/It  
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<alias>DBPool</alias> ;Jn"^zT  
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<!--proxool只能管理由自己产生的连接--> ]<pnHh+2A  
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<driver-url> ha;Xali ]  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 Y\.ds%G  
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<driver-class>com.mysql.jdbc.Driver</driver-class> C)7T'[  
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<driver-properties> WMo   
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<property name="user" value="root"/> & *^FBJEa.  
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</driver-properties> ];-DqK'  
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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 dFd^@b  
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收,超时的销毁--> vZgV/?'z  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> *Cdw"n  
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用户连接就不会被接受--> _f~(g1sE  
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<maximum-new-connections>20</maximum-new-connections> 7j>NUx=j3  
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<prototype-count>5</prototype-count> hPCt-  
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等待请求数由maximum-new-connections决定--> O8;`6r  
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<maximum-connection-count>100</maximum-connection-count> F{:ZHCm  
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<minimum-connection-count>10</minimum-connection-count> I)xB I~x  
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</proxool> LvWl*:z  
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(2)配置hibernate.cfg.xml文件 bv.DW,l%'  
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<!DOCTYPE hibernate-configuration ]=s!cfu  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" dDuT,zP  
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<property name="hibernate.connection.provider_class"> k,EI+lCX  
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org.hibernate.connection.ProxoolConnectionProvider 3Y\7+975m  
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</property> )V!9/d  
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<property name="hibernate.proxool.pool_alias">DBPool</property> '~dE0ohWb  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> MA:2]l3e  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> 5e!YYt>  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> /PP\L]
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</session-factory> Nhh2P4gH  
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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  us&!%`  
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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 )P6n,\  

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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。 ]J^9iDTTA  
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(4) dialect是声明ＳＱＬ语句的方言 U] 2fV|Hn  
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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。 9aLS%-x!+  
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(6) <mapping >资源文件映射 Evz;eobW/  
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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： >*xa\ve  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 j1!P:(  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory 2.I'`A  
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hibernate.transaction.manager_loopup_class = ^*7~ Wxk5  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect zl>l.zJ