hibernate连接池

1．Hibernate默认连接池 JQCQpn/  
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<?xml version='1.0' encoding='UTF-8'?> L4bx [  
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<!DOCTYPE hibernate-configuration kk6Af\NZ  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" rr/0pa$  
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<hibernate-configuration> 6\jhDP@`9  
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<!?JDBC驱动程序--> x<_uwL2a  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> luNEgCq  
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<!-- 连接数据库的URL--> J9+<9g4-t  
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<property name="connection.url"> i8CO+Iv*{  
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jdbc:mysql://localhost:3306/schoolproject *}mk$bA  
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</property> |$
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<property name="connection.useUnicode">true</property> 5Q
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<property name="connection.characterEncoding">UTF-8</property> ces|HPBa&6  
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<!--连接的登录名--> z"[}Sk  
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<property name="connection.username">root</property> {ek axSR  
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<!?登录密码--> 1DzI@c~X  
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<property name="connection.password"></property> mU d['Z  
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<!--是否将运行期生成的SQL输出到日志以供调试--> <d&9`e1Hc  
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<property name="show_sql">true</property> ?<mxv"  
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<!--指定连接的语言--> Szz:$!t  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> S3cV^CzNg  
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<!--映射Student这个资源--> s2`:NS  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> J0%e6{C1  
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</session-factory> 1?!z<<  
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</hibernate-configuration> Pl2ZA)[g  
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2．C3P0连接配置 c-?2>%;(V  
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<!DOCTYPE hibernate-configuration g#??Mz  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" o8Q+hZB}A  
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<hibernate-configuration> fWutB5?P  
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<!?JDBC驱动程序--> LBCat=d<  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> Z+3j>_Ss  
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<property name="connection.url"> Y1=.46Ezf  
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jdbc:mysql://localhost:3306/schoolproject Oo-%;l`&  
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</property> ;XUiV$  
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<property name="connection.useUnicode">true</property> R=/^5DZ}  
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<property name="connection.characterEncoding">UTF-8</property> |_ChK6Q?v  
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<property name="connection.username">root</property> #z.QBG@  
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<property name="connection.password"></property> 5:T)hoF@  
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<!-- C3P0连接池设定--> Pl9Ky(Q`V  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider Ho_ 2zx:8b  
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<property name="hibernate.c3p0.max_size">20</property> !+F6Bf  
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<property name="hibernate.c3p0.min_size">5</property> 0P%,1M3d  
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<property name="hibernate.c3p0.timeout">120</property> ~"IjT'W3  
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<property name="hibernate.c3p0.max_statements">100</property> 0/g 0=dW=  
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<property name="hibernate.c3p0.idle_test_period">120</property> n#.~XNbxv  
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<property name="hibernate.c3p0.acquire_increment">2</property> Uiz#QGt  
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<!--是否将运行期生成的SQL输出到日志以供调试--> 9^AfT>b~f  
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<property name="show_sql">true</property> H
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<!--指定连接的语言--> ;DG&HO  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> W/?\8AE
 
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<!--映射Student这个资源--> X (0`"rjg  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> [=otgVteN"  
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</session-factory> 'u)zQAaw.  
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</hibernate-configuration> E7c!KJ2  
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3．proxool连接池 FFvF4]|L  
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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 2b`3"S  
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<?xml version="1.0" encoding="UTF-8"?> AfV a[{E  
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<!-- the proxool configuration can be embedded within your own application's. [og_0;  
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Anything outside the "proxool" tag is ignored. --> mh8{`W&  
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<proxool> ]'%Z&1 w  
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<alias>DBPool</alias> 7:cmBkXm  
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<!--proxool只能管理由自己产生的连接--> z;F6:aBa  
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<driver-url> GCEcg&s=\S  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 C'a%piX  
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<!?JDBC驱动程序--> Uql|32j  
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<driver-class>com.mysql.jdbc.Driver</driver-class> C@7<0w  
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<driver-properties> eOdB<He36  
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<property name="user" value="root"/> e=yQFzQT)  
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<property name="password" value=""/> F"?OLV1B&  
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</driver-properties> Z fQzA}QD  
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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 tt=JvI9>  
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收,超时的销毁--> n&j@7R  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> =jWcD{;1I}  
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<!-- 指因未有空闲连接可以分配而在队列中等候的最大请求数,超过这个请求数的 9 K.
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用户连接就不会被接受--> @Z fQ)q\  
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<maximum-new-connections>20</maximum-new-connections> B]""%&! O  
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<prototype-count>5</prototype-count> ^>3q@,C]c  
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等待请求数由maximum-new-connections决定--> 5Q9nJC{'NN  
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<maximum-connection-count>100</maximum-connection-count> _~=qByD   
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<minimum-connection-count>10</minimum-connection-count> ,/XeG`vk  
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</proxool> Q^|ZoJS  
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(2)配置hibernate.cfg.xml文件 L355uaj  
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<!DOCTYPE hibernate-configuration 'UW(0 PXw  
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<property name="hibernate.connection.provider_class"> >`3wEJ"<  
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org.hibernate.connection.ProxoolConnectionProvider %/K'VE6pb  
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<property name="hibernate.proxool.pool_alias">DBPool</property> 5Dhpcgq<<  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> vLc7RL  
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<property name="show_sql">true</property> U:a-Wi+  
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<!--指定连接的语言-->  L$Uy  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> +# 38  
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<!--映射Student这个资源--> wa#$9p~Q  
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</session-factory> _D{V(c<WD  
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(1) hibernate.connection.provider_class定义Hibernate的连接加载类，这里Proxool连接池是用这个，不同的连接池有不同的加载类，可以查阅Hibernate文档获取相关信息 3k#?E]'  
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(2) hibernate.proxool.pool_alias这里就是用我们上面提到的连接池的别名 9i&(VzY[=  
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(3) hibernate.proxool.xml是向Hibernate声明连接池的配置文件位置，可以用相对或绝对路径，用相对路径时要注意一定在要Path范围内！不然会抛出异常。 i
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(4) dialect是声明ＳＱＬ语句的方言 M;96Wm  
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(5) show_sql定义是否显示Hibernate生成的ＳＱＬ语言，一般在调试阶段设为true,完成后再改成false，这样有利于调试。 C9,|G7~*q  
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(6) <mapping >资源文件映射 NFVr$?P  
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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： /8)-j}gZa  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 C\Y%FTS:  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory \z~wm&  
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hibernate.transaction.manager_loopup_class = o~aK[   
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hibernate.dialect=org.hibernate.dialect.MySQLDialect d(=*@epjR