hibernate连接池

1．Hibernate默认连接池 = ng\  
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<?xml version='1.0' encoding='UTF-8'?> mHw1n=B  
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<!DOCTYPE hibernate-configuration lzuPE,h  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" h"ZF,g;a  
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<hibernate-configuration> _^&oNm1  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> zRf]SZ(tO  
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<!-- 连接数据库的URL--> C
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<property name="connection.url"> hoU&'P8  
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jdbc:mysql://localhost:3306/schoolproject (y(V,kXwa8  
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<property name="connection.useUnicode">true</property> S:^Q(w7  
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<property name="connection.characterEncoding">UTF-8</property> BB>7%~3f  
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<!--连接的登录名-->
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<property name="connection.username">root</property> 3c-ve$8u~  
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<property name="connection.password"></property> gvsS:4N"Nq  
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<!--是否将运行期生成的SQL输出到日志以供调试--> gb@!Co3  
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<property name="show_sql">true</property> #2cH.`ty  
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<!--指定连接的语言--> EaP#~x  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> !)LR41>?  
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<!--映射Student这个资源--> 6] <?+#uQ  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> >6<g5ps.n  
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</hibernate-configuration> A;Zg:  
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2．C3P0连接配置 OgOu$.  
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<!DOCTYPE hibernate-configuration .Hgiru&  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" A:p0p^*  
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"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> Z2 t0l%  
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<hibernate-configuration> kdoE)C   
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> hW|t
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<!-- 连接数据库的URL--> ~gX@2!D5k  
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<property name="connection.url"> (:hPT-1  
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jdbc:mysql://localhost:3306/schoolproject 6 #QS5  
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<property name="connection.useUnicode">true</property> rj:$'m7  
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<property name="connection.characterEncoding">UTF-8</property> z:fd'NC  
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<!--连接的登录名--> @V<tg"(c  
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<property name="connection.username">root</property> 2+Fq'!  
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<property name="connection.password"></property> 6X'RCJu%  
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<!-- C3P0连接池设定--> Q)Ppx7)  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider
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<property name="hibernate.c3p0.max_size">20</property> yyiZV\ /  
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<property name="hibernate.c3p0.min_size">5</property> 3z5,4ps  
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<property name="hibernate.c3p0.timeout">120</property> 0dnm/'L  
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<property name="hibernate.c3p0.max_statements">100</property> a Y{E'K=  
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<property name="hibernate.c3p0.idle_test_period">120</property> 55yP.@i9J  
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<property name="hibernate.c3p0.acquire_increment">2</property> 5g/WQo\  
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<!--是否将运行期生成的SQL输出到日志以供调试--> 38 B\ \  
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<property name="show_sql">true</property> Ozn7C?\*  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> IOfo]p-  
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<!--映射Student这个资源--> Nf$Y-v?i  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> gp$+Qd  
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</session-factory> VT+GmS  
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</hibernate-configuration> SIbQs8h]  
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3．proxool连接池 I5 [r-r  
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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 m2N ?Fg  
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<!-- the proxool configuration can be embedded within your own application's. ,ZH)[P)5P  
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Anything outside the "proxool" tag is ignored. --> 4jar5Mz  
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<proxool> (/FPGYu3h  
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<alias>DBPool</alias> /V3*[  
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<driver-url> 2t[inzn=E  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 )u[2TI1  
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</driver-url> o5zth^p[  
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<driver-class>com.mysql.jdbc.Driver</driver-class> ,=K!Y TeVl  
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<driver-properties> J }JT%SW  
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<property name="user" value="root"/> ty/jTo}  
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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 Npq=jlj  
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收,超时的销毁--> 6bfk4k  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> ~r@'kUXKK  
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用户连接就不会被接受--> f'r/Q2{n  
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<maximum-new-connections>20</maximum-new-connections> Wx:_F;  
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<prototype-count>5</prototype-count> i?
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等待请求数由maximum-new-connections决定--> >} aykz*g  
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<maximum-connection-count>100</maximum-connection-count> $\a;?>WA"  
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<minimum-connection-count>10</minimum-connection-count> }KZ/>Z;^  
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</proxool> u5idH),<  
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(2)配置hibernate.cfg.xml文件 oNiS"\t  
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<!DOCTYPE hibernate-configuration crvWAsm  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" hefV0)4K  
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<hibernate-configuration> _
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<property name="hibernate.connection.provider_class"> f
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org.hibernate.connection.ProxoolConnectionProvider zpa'G1v  
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<property name="hibernate.proxool.pool_alias">DBPool</property> eyo)Su  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> uCUBs(iD  
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<!--指定连接的语言--> xr6Q5/p1  
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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 Ezml LFp.  
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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 Riw>cVi~  
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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#A`fJ  
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(4) dialect是声明ＳＱＬ语句的方言 JLG5`{  
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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。
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(6) <mapping >资源文件映射 T]i~GkD\  
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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： IjrTM{f  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 54 8@._-S  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory *&AK.n_  
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hibernate.transaction.manager_loopup_class = h{TnvI/"  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect [S9nF