hibernate连接池

1．Hibernate默认连接池 4,I,f>V  
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<?xml version='1.0' encoding='UTF-8'?> 9&n9J^3L  
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<!DOCTYPE hibernate-configuration wUv?;Y$C  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" ]#)(D-i  
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<hibernate-configuration> mqZH<.mn  
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<session-factory > DM^0[3XuV5  

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<!?JDBC驱动程序--> 3^7+fxYWo  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> wk|+[Rl;L  
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<!-- 连接数据库的URL--> 4z0gyCAC A  
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<property name="connection.url"> 8RMM97@1Q  
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jdbc:mysql://localhost:3306/schoolproject 9 C[~*,qx  
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<property name="connection.useUnicode">true</property> g0B] ;Y>(  
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<property name="connection.characterEncoding">UTF-8</property> Msqqjhoy  
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<!--连接的登录名--> }Va((X w  
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<property name="connection.username">root</property> 3FiK/8mu  
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<!?登录密码--> 3``JrkPI  
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<property name="connection.password"></property> W.j^L;  
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<!--是否将运行期生成的SQL输出到日志以供调试--> rfwJLl/  
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<property name="show_sql">true</property> xuXPVJdi  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> ED` 1)1<  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> YS|Dw'%g /  

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</session-factory> kkl'D!z2g  
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</hibernate-configuration> }b1G21Dc!  
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2．C3P0连接配置 D\Ez~.H  
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<!DOCTYPE hibernate-configuration R'gd/.[e  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" Htgo=7!?\3  
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<!?JDBC驱动程序--> y,:WLk~  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> ,=+t2Bn  
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<!-- 连接数据库的URL--> (?l ]}p^[  
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<property name="connection.url"> cAN!5?D\  
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jdbc:mysql://localhost:3306/schoolproject W.^zN'a  

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<property name="connection.useUnicode">true</property> {}s/p9F4  
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<property name="connection.characterEncoding">UTF-8</property> ,\i*vJ#f  
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<property name="connection.username">root</property> ;+DEU0|pe  
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<property name="connection.password"></property> wn@~80)$  
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<!-- C3P0连接池设定--> l :{q I#Q  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider 2OUx@Vj  
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<property name="hibernate.c3p0.max_size">20</property> Lk|`\I T  
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<property name="hibernate.c3p0.min_size">5</property> qh.F}9o  
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<property name="hibernate.c3p0.timeout">120</property> Io
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<property name="hibernate.c3p0.max_statements">100</property> 6/ 5c|  
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<property name="hibernate.c3p0.idle_test_period">120</property> $e+4Kt ,  
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<property name="hibernate.c3p0.acquire_increment">2</property> 0UJ6>Rj  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> 6am6'_{  
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</session-factory> Yr"Of*VNH  
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</hibernate-configuration> x*:VE57,z  
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3．proxool连接池 ;6 W[%{  
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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 lx4pTw1  
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Anything outside the "proxool" tag is ignored. --> { i6L/U.  
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<proxool> ~}j+~  
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<alias>DBPool</alias> pTi7Xy!Cw  
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<!--proxool只能管理由自己产生的连接--> q/zU'7%@  
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<driver-url>  s&pnB  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 q\?p' i  
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<driver-class>com.mysql.jdbc.Driver</driver-class> 3e'6A^#  
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<driver-properties> l+

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<property name="user" value="root"/> @I-gs(  
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<property name="password" value=""/> h_#=
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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 ou-UR

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收,超时的销毁--> ?110} [jw  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> pml33^*<U  
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用户连接就不会被接受--> ~C%I'z'  
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<maximum-new-connections>20</maximum-new-connections> r~)fAb?  
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<prototype-count>5</prototype-count> ErNYiYLi]  

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等待请求数由maximum-new-connections决定--> {V6pC  
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<maximum-connection-count>100</maximum-connection-count> GAgTy  
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<minimum-connection-count>10</minimum-connection-count> 6E}9uwQ  
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(2)配置hibernate.cfg.xml文件 VdK%m`;2  
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<!DOCTYPE hibernate-configuration Y'|,vG  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" [oTe8^@[  
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"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> e7U\gtZ.  
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<session-factory > TsTc3  
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<property name="hibernate.connection.provider_class"> "OjAhKfG  
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<property name="hibernate.proxool.pool_alias">DBPool</property> Q6Gw!!Z5EA  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> Ki;SONSV~|  
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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 'h*jL@%TT  
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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 8 t5kou]h  
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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。 'X?xn@?  

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(4) dialect是声明ＳＱＬ语句的方言 _VrY7Mz:r  
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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。 iEvQ4S6tD  
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(6) <mapping >资源文件映射 Mkz_.;3  
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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： =c[tHf  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 "%-Vrb=:Y  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory <g[z jV9p  
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hibernate.transaction.manager_loopup_class = Z?axrGmg0  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect WK>F0xMs1