hibernate连接池

1．Hibernate默认连接池 zo{/'BnU  
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<?xml version='1.0' encoding='UTF-8'?> R9We/FhOY  
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<!DOCTYPE hibernate-configuration m8Vdb"0  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" 2N#$X'8  
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"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> {yAL+}  
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<!?JDBC驱动程序--> mpC`Yk  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property>  @4d)R  
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<!-- 连接数据库的URL--> zQ?!f#f  
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<property name="connection.url"> WFR?fDtE  
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jdbc:mysql://localhost:3306/schoolproject $w)~O<_U  
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<property name="connection.useUnicode">true</property> 8*SDiZ  
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<property name="connection.characterEncoding">UTF-8</property> 9Gy  
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<!--连接的登录名--> vE6mOM!_L  
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<property name="connection.username">root</property> Sgim3):Z  
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<property name="connection.password"></property> 3uU]kD^  
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<!--是否将运行期生成的SQL输出到日志以供调试--> yNW\?Z$@q  
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<!--指定连接的语言--> ^m#-9-`  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> 'K@|3R  
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<!--映射Student这个资源--> {^CT}\=>  

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</session-factory> t$2_xX  
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2．C3P0连接配置 UT~a&u  
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<!DOCTYPE hibernate-configuration wIkN9 f  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" zX5!vaEv  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> IUR<.Y`  
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<!-- 连接数据库的URL--> d0'JC*  
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<property name="connection.url"> k6`6Mjbc  
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jdbc:mysql://localhost:3306/schoolproject }QZQ3@  
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</property> zf3v5Hk  
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<property name="connection.useUnicode">true</property> f7Ul(D:j\  
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<property name="connection.characterEncoding">UTF-8</property> H>r!i4l  
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<!--连接的登录名--> "#mBcQ;QLV  
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<property name="connection.username">root</property> }68i[v9Njk  
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<!-- C3P0连接池设定--> 12Y  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider hsu{eyp  
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<property name="hibernate.c3p0.max_size">20</property> .`?@%{  
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<property name="hibernate.c3p0.min_size">5</property> vn/.}GkpU  
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<property name="hibernate.c3p0.timeout">120</property> mf'V)  
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<property name="hibernate.c3p0.max_statements">100</property> A'P(a`  
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<property name="hibernate.c3p0.idle_test_period">120</property> `y+tf?QN  
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<property name="hibernate.c3p0.acquire_increment">2</property> `est|C '+  
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<!--是否将运行期生成的SQL输出到日志以供调试--> e%W$*f  
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<property name="show_sql">true</property> r(gXoq_w  
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<!--指定连接的语言--> !A48TgAeE  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> ~/j\Z  
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<!--映射Student这个资源--> LdJYE;k Ju  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> Sp@-p9#  
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</hibernate-configuration> # W"=ry3{  
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3．proxool连接池 R:B^  
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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 J=/5}u_gw  
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<?xml version="1.0" encoding="UTF-8"?> Yw0[[N<SW  
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<!-- the proxool configuration can be embedded within your own application's. e1P"[|9>R  
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Anything outside the "proxool" tag is ignored. --> ;J7F J3n  
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<proxool> r(9~$_(vK  
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<!--连接池的别名--> z?35=%~w   
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<alias>DBPool</alias> 1)Zf3Y8  
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<!--proxool只能管理由自己产生的连接--> l#n,Fg3  
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<driver-url> QE7V. >J_p  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 13Lr}M&  
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</driver-url> 9?k_y ZV  
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<driver-class>com.mysql.jdbc.Driver</driver-class> )+fh-Ui  
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<driver-properties> ,~._}E&9I  
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<property name="user" value="root"/> xMBaVlEN  
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<property name="password" value=""/> 7VP32Eh[  
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</driver-properties> k!{p7*0  
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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 nl9P, d  
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收,超时的销毁--> &ot/nQQ  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> vY_-Ranj#.  
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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 KI+VXH}Y5{  
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用户连接就不会被接受--> M %Qt|@O  
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<maximum-new-connections>20</maximum-new-connections> iJ~Vl"|m  
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<prototype-count>5</prototype-count> !Ta>U^7  
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等待请求数由maximum-new-connections决定--> m1*O0Tg]"  
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<maximum-connection-count>100</maximum-connection-count> b3VS\[p  
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<minimum-connection-count>10</minimum-connection-count> tzh1s i  
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(2)配置hibernate.cfg.xml文件 i _%Q`i  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN"
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<hibernate-configuration> Q0ON9gqqv  
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<property name="hibernate.connection.provider_class"> 1&U>,;]*
 
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org.hibernate.connection.ProxoolConnectionProvider BGu?<bET  
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<property name="hibernate.proxool.pool_alias">DBPool</property> # m *J&  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> =i7`ek  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> ,c)uX#1  
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</session-factory> .8G@%p{,  
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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 2j[&=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 DY?Kfvef  
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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。 Z7?~S
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(4) dialect是声明ＳＱＬ语句的方言 y)@[Sl>  
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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。 os]8BScx  
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(6) <mapping >资源文件映射 qDfd.gL  
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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： *9{Z$IA9w  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 uPl\I6k  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory 9Q+'n$s0^  
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hibernate.transaction.manager_loopup_class = 9AJ7h9L  
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org.hibernate.transaction.JBossTransactionManagerLookup y`XU~B)J1  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect 9^G/8<^^>