hibernate连接池

1．Hibernate默认连接池 Xq03o#-p+  
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<?xml version='1.0' encoding='UTF-8'?> [+pa,^  
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<!DOCTYPE hibernate-configuration Qg~w 3~  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" D"$Y, d  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> ksOsJ~3)  
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<!-- 连接数据库的URL--> wn!=G~nB  
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<property name="connection.url"> X5VNj|IE  
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jdbc:mysql://localhost:3306/schoolproject 'G>XI;g  
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<property name="connection.useUnicode">true</property> ou~$XZ7oi  
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<property name="connection.characterEncoding">UTF-8</property> z{\tn.67  
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<!--连接的登录名--> (XmmbAbVom  
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<property name="connection.username">root</property> l`N#~<.  
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<property name="connection.password"></property> X5/fy"g&  
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<!--是否将运行期生成的SQL输出到日志以供调试--> 8CUtY9.  
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<property name="show_sql">true</property> ZJZSt% r  
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<!--指定连接的语言--> 1q-;+Pd;  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> }vU/]0@,E  
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<!--映射Student这个资源--> fb`x1Q  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> pI
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</session-factory> Ly8=SIZ   
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</hibernate-configuration> 3WQa^'u  
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2．C3P0连接配置 +%\Ci!%b  
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<?xml version='1.0' encoding='UTF-8'?> K)>F03=uE  
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<!DOCTYPE hibernate-configuration &}e>JgBe0  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" duEXp]f!  
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"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> ;-~E!_$  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> iy]L"7&Z2  
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<!-- 连接数据库的URL--> E`JW4)AH  
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<property name="connection.url">
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jdbc:mysql://localhost:3306/schoolproject d'MZ%.#  
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</property> Q?1.GuF  
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<property name="connection.useUnicode">true</property> s[{8:Px  
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<property name="connection.characterEncoding">UTF-8</property> |%8t.
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<property name="connection.username">root</property> } -4p8Zt  
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<property name="connection.password"></property> pHVDug3  
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<!-- C3P0连接池设定--> (AA@sN  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider ;QuxTmWp^  
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<property name="hibernate.c3p0.max_size">20</property> *URY8a`bO  
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<property name="hibernate.c3p0.min_size">5</property> ]lJ#|zd8o  
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<property name="hibernate.c3p0.timeout">120</property> |'i ?o  
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<property name="hibernate.c3p0.max_statements">100</property> .O~rAu*K  
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<property name="hibernate.c3p0.idle_test_period">120</property> rf$[8d  
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<property name="hibernate.c3p0.acquire_increment">2</property> $a\X(okx  
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<property name="show_sql">true</property> $\4Or  
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<!--指定连接的语言--> a3Z()|t>  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> N/^[c+J  
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</session-factory> Z[j-.,Qu  
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</hibernate-configuration> &P8Q|A-u  
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3．proxool连接池 v:j4#pEWD  
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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 VHws9)  
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<?xml version="1.0" encoding="UTF-8"?> m7mC 7x  
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<!-- the proxool configuration can be embedded within your own application's. r?2C%GI`  
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Anything outside the "proxool" tag is ignored. --> l}c<eEfOy"  
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<proxool> K<_H`k*x
 
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<alias>DBPool</alias> o_$r*Z|HG  
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<driver-url> y.oJzU[p%  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 9hp0wi@W}  
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</driver-url> ZmHl~MR@  
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<driver-class>com.mysql.jdbc.Driver</driver-class> QY fS-  
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<driver-properties> 5Np.&  
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<property name="user" value="root"/> |O+binq  
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<property name="password" value=""/> e)bqE^JP  
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<!-- proxool自动侦察各个连接状态的时间间隔(毫秒),侦察到空闲的连接就马上回 Ky$G$H  
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收,超时的销毁--> RLNuH2y
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> Zb;$
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<maximum-new-connections>20</maximum-new-connections> l zPS RT  
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<prototype-count>5</prototype-count> @j2*.ee  
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等待请求数由maximum-new-connections决定--> /Q>{YsRRB  
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<maximum-connection-count>100</maximum-connection-count> :;*#Qh3"  
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<minimum-connection-count>10</minimum-connection-count> CNRU"I+jU  
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(2)配置hibernate.cfg.xml文件 Xlqz8cI  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" I~]Q55  
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<property name="hibernate.connection.provider_class"> r)
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org.hibernate.connection.ProxoolConnectionProvider Q$|^~  
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<property name="hibernate.proxool.pool_alias">DBPool</property> ?~aZ#%*i8  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> `%t$s,TiP  
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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 :AZp}  
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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  ozU2  
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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。 `4LJ;KC(  
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(4) dialect是声明ＳＱＬ语句的方言 QO2Ut!Y  
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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。 Vb2\/e:k  
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(6) <mapping >资源文件映射 |~eY%LB  
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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 l(Dee Y  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 L?HF'5o  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory 7aQn;  
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hibernate.transaction.manager_loopup_class = p5-<P?B  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect zka?cOmYF[