hibernate连接池

1．Hibernate默认连接池 wz31e
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<?xml version='1.0' encoding='UTF-8'?> =l&7~  
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<!DOCTYPE hibernate-configuration mu0
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" 0RN]_z$;H  
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<!?JDBC驱动程序--> ]re1$W#*  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> L0Bcx|)"$`  
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<!-- 连接数据库的URL--> %f
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<property name="connection.url"> q3TAWNzI0  
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jdbc:mysql://localhost:3306/schoolproject eaCv8z
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<property name="connection.useUnicode">true</property> XzgJ@  
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<property name="connection.characterEncoding">UTF-8</property> xCz(qR  
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<!--连接的登录名--> C:xgM'~+  
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<property name="connection.username">root</property> a` A V  
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<property name="connection.password"></property> s'qd%JxD  
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<!--是否将运行期生成的SQL输出到日志以供调试--> #mLF6"A  
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<property name="show_sql">true</property> Pky/fF7e  
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<!--指定连接的语言--> ER<LP@3k  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> l8 k@.<nCO  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> *UhYX)J  
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2．C3P0连接配置 8Yc'4v#}  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" ~(bY-6z  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> nMm4fns  
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<property name="connection.url"> San3^uX  
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jdbc:mysql://localhost:3306/schoolproject <8;SSdoKi  
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</property> N~NUBEKcp  
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<property name="connection.useUnicode">true</property> 1%Hc/N-  
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<property name="connection.characterEncoding">UTF-8</property> Nl/^ga  
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<!--连接的登录名-->
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<property name="connection.username">root</property> IE*eDj  
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<!-- C3P0连接池设定--> |ppG*ee  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider I
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<property name="hibernate.c3p0.max_size">20</property> suOWmqLs  
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<property name="hibernate.c3p0.min_size">5</property> /=5:@  
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<property name="hibernate.c3p0.timeout">120</property> |WP}y-Au
 
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<property name="hibernate.c3p0.max_statements">100</property> Lf0X(tC  
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<property name="hibernate.c3p0.idle_test_period">120</property> jD}G9=[$1  
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<property name="hibernate.c3p0.acquire_increment">2</property> e|-&h `[  
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<property name="show_sql">true</property> !d.bCE~  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> WUBI(g\  
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3．proxool连接池 I+{2DY/}  
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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  CK+t6Gp  
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<!-- the proxool configuration can be embedded within your own application's. W1Vy5V|M  
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Anything outside the "proxool" tag is ignored. --> EVlj#~mV  
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<alias>DBPool</alias> 9OYyR  
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<driver-url> B[3u,<opFU  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 4/ WKR3X  
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<driver-class>com.mysql.jdbc.Driver</driver-class>  + \]-"  
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<driver-properties> <Umr2Vw-  
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<property name="user" value="root"/> XV}}A^  
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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 !w}b}+]GB  
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收,超时的销毁--> f^-ot@w  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> riL|B3  
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<maximum-new-connections>20</maximum-new-connections> ,CI-IR2  
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<prototype-count>5</prototype-count> \HIBnkj)3n  
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等待请求数由maximum-new-connections决定--> ,]@K,|pC)  
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<maximum-connection-count>100</maximum-connection-count> m_;fj~m  
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<minimum-connection-count>10</minimum-connection-count> k33\;9@k  
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(2)配置hibernate.cfg.xml文件 QJj='+R>  
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<hibernate-configuration> *RxJ8.G  
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<property name="hibernate.connection.provider_class"> AmHj\NX$  
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<property name="hibernate.proxool.pool_alias">DBPool</property> {ZrlbDQX  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> >I0;MNX  
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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 ?tY+P`S  
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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 2zqaR[C  
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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。 cN0 *<  
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(4) dialect是声明ＳＱＬ语句的方言 !DzeJWM|  
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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。 PkrVQH9^w  
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(6) <mapping >资源文件映射 w.w{L=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： . 2$J-<O  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 JyZuj>` 6  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory #Z1-+X8P  
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hibernate.transaction.manager_loopup_class = F<k+>e  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect n!4\w>h