hibernate连接池

1．Hibernate默认连接池 7v't# =  
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<?xml version='1.0' encoding='UTF-8'?> GCZx-zD~>  
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<!DOCTYPE hibernate-configuration E6XDn`:  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" >cJix 1  
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<session-factory > [4w*<({*  
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<!?JDBC驱动程序--> r3qKT  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> bMn)lrsX  
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<property name="connection.url"> FY<Q|Ov  
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jdbc:mysql://localhost:3306/schoolproject ":0u%E?s  
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<property name="connection.useUnicode">true</property> _3(rwD
 
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<property name="connection.characterEncoding">UTF-8</property> k@ <dru  
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<!--连接的登录名--> l^Ob60)2  
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<property name="connection.username">root</property> LN~mKoW  
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<property name="connection.password"></property> 6@TU9AZS`  
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<!--是否将运行期生成的SQL输出到日志以供调试--> Da615d  
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<property name="show_sql">true</property>
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<!--指定连接的语言--> d\uN  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> N"}>);r  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> VE-l6@`  
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</session-factory> lhHH|~t0  
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2．C3P0连接配置 [a04
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<!DOCTYPE hibernate-configuration \rF
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" '|DW#l\n  
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<!?JDBC驱动程序--> tw_o?9  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> hyH[`wiq  
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<!-- 连接数据库的URL--> cD0rU8x  
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<property name="connection.url"> wb0$FZzh  
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jdbc:mysql://localhost:3306/schoolproject 'OsZD?W{  
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<property name="connection.useUnicode">true</property> U?UU]>Q  
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<property name="connection.characterEncoding">UTF-8</property> +/ZIs|B4,z  
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<property name="connection.username">root</property> 4!IuTPmr  
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<property name="connection.password"></property> eFG/!b<17  
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<!-- C3P0连接池设定--> [Fl_R[o  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider V&*IZt&  
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<property name="hibernate.c3p0.max_size">20</property> cnu&!>8V  
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<property name="hibernate.c3p0.min_size">5</property> |0n )U(  
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<property name="hibernate.c3p0.timeout">120</property> ^Hx}.?1  
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<property name="hibernate.c3p0.max_statements">100</property>
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<property name="hibernate.c3p0.idle_test_period">120</property> cYA:k  
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<property name="hibernate.c3p0.acquire_increment">2</property> ,Kv6!ib6Q  
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<!--指定连接的语言--> }>{R<[I!G  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> `i`P}W!F  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> HxO+JI`'3  
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3．proxool连接池 rZgu`5<a  
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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 -|V#U`mwF  
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<!-- the proxool configuration can be embedded within your own application's. l;q]z  
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Anything outside the "proxool" tag is ignored. --> a<-aE4wdm  
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<proxool> ,~3rY,y-  
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<alias>DBPool</alias> iY>P7Uvvz  
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<!--proxool只能管理由自己产生的连接--> Fug4u?-n  
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<driver-url> R?1Z[N  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 ^U?Ac=  
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<driver-class>com.mysql.jdbc.Driver</driver-class> RL&0?OT  
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<driver-properties> CA|l| t^  
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<property name="user" value="root"/> 8Vz!zYl  
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</driver-properties> HY_>sD  
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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 $S' TW3  
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收,超时的销毁--> 0,-]O=   
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> XzI
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用户连接就不会被接受--> 02J(*_o  
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<maximum-new-connections>20</maximum-new-connections> [(a3ljbRX  
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<prototype-count>5</prototype-count> }fk3a9j9u  
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等待请求数由maximum-new-connections决定--> ewT K2  
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<maximum-connection-count>100</maximum-connection-count> b00$3,L   
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<minimum-connection-count>10</minimum-connection-count> }D!tB  
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(2)配置hibernate.cfg.xml文件 &n8Ja@Y]  
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<!DOCTYPE hibernate-configuration P@GU2[1  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" BI%~0Gj8  
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<property name="hibernate.connection.provider_class"> 6&'kN2  
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<property name="hibernate.proxool.pool_alias">DBPool</property> qHgtd+ I  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> 2DsP "q79k  
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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 +PsR*T  
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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 Jpp-3i.F#  
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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。 9'~qA(=.?  
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(4) dialect是声明ＳＱＬ语句的方言 0Qeda@J  
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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。 "38<14V
 
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(6) <mapping >资源文件映射 hTZ6@i/pS  
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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： rmvrv.$3  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 O\;Lb[`lb  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory }0H<G0  
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hibernate.transaction.manager_loopup_class = @|ZUyat  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect RYC%;h