hibernate连接池

1．Hibernate默认连接池 ksYPF&l  
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<?xml version='1.0' encoding='UTF-8'?> Z/;8eb*B7  
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<!DOCTYPE hibernate-configuration grJ(z)c  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" ~k ]$J|}za  
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<!?JDBC驱动程序--> ZP.~Y;Ch;-  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> " _TAo  
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<!-- 连接数据库的URL--> *+J`Yk7}  
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<property name="connection.url"> m;u:_4  
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jdbc:mysql://localhost:3306/schoolproject ~A*$+c(  
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<property name="connection.useUnicode">true</property> 
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<property name="connection.characterEncoding">UTF-8</property> B)&z% +  
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<property name="connection.username">root</property> K- TLzoYA  
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<property name="connection.password"></property> G5$YXNV  
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<!--是否将运行期生成的SQL输出到日志以供调试--> RG`eNRTQ%  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> +J:wAmY4  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> tL S$D-  
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</session-factory> eu?DSad  
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2．C3P0连接配置 wXUgxa  
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<!DOCTYPE hibernate-configuration \%]!/&>{6  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" qJEtB;J'  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> Ky6 d{|H  
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<property name="connection.url"> P(Q}r7F~(  
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jdbc:mysql://localhost:3306/schoolproject !eGUiE=  
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<property name="connection.useUnicode">true</property> h9WyQl7  
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<property name="connection.characterEncoding">UTF-8</property> .vhEm6wJUM  
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<property name="connection.username">root</property> #FsoK*F  
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<property name="connection.password"></property> g,d'&r"JWt  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider TC^fyxq  
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<property name="hibernate.c3p0.max_size">20</property> ipn0WQG  
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<property name="hibernate.c3p0.min_size">5</property> Xhm)K3RA*T  
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<property name="hibernate.c3p0.timeout">120</property> R1NwtnS  
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<property name="hibernate.c3p0.max_statements">100</property> tA]Y=U+Q  
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<property name="hibernate.c3p0.idle_test_period">120</property> {2
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<property name="hibernate.c3p0.acquire_increment">2</property> '(!
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<property name="show_sql">true</property> -:V0pb  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> 7l+:gD  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> #xoFcjRE  
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</hibernate-configuration> c}G\F$  
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3．proxool连接池 DX(!G 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 oXgi#(y  
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Anything outside the "proxool" tag is ignored. --> #/ HQ?3h]  
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<proxool> /[>zFYaQ  
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<alias>DBPool</alias> A2p%Y},  
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<driver-url> "kjSg7m*:  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 s? 2ikJq  
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<driver-class>com.mysql.jdbc.Driver</driver-class> -wh  
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<property name="user" value="root"/> `]a0z|2'!  
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收,超时的销毁--> JEF;Q  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> bD-OEB  
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用户连接就不会被接受--> :}-?X\|\  
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<maximum-new-connections>20</maximum-new-connections> WdB\n/BWB  
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等待请求数由maximum-new-connections决定--> >s1?rC  
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<minimum-connection-count>10</minimum-connection-count> U<E]c 4*  
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(2)配置hibernate.cfg.xml文件 |I29m`  
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<property name="hibernate.connection.provider_class"> 3bR%#G%  
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org.hibernate.connection.ProxoolConnectionProvider /&_q"y9  
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<property name="hibernate.proxool.pool_alias">DBPool</property> 0fn*;f8{XJ  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> yU4mS;GX  
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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 j BBl{  
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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 SA&(%f1d  
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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。 2,`X@N`\  
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(4) dialect是声明ＳＱＬ语句的方言 Xq03o#-p+  
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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。 :[328X2  
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(6) <mapping >资源文件映射 ")\V  
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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： 4K~=l%l  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 )UF'y{K}  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory SO(BkxV@  
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hibernate.transaction.manager_loopup_class = +`~6Weay  
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org.hibernate.transaction.JBossTransactionManagerLookup W%^;:YQ9i  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect ju?D=n@i