hibernate连接池

1．Hibernate默认连接池 IKGTsA;  
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<!DOCTYPE hibernate-configuration T<f2\q8Uo=  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" <{E;s)hD?  
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"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> r|*:9|y{"/  
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<!?JDBC驱动程序-->
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> {%=S+89l  
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<!-- 连接数据库的URL--> HmhU
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<property name="connection.url"> :-w@^mli  
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jdbc:mysql://localhost:3306/schoolproject @55bE\E?@  
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</property> ]Mn&76fu  
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<property name="connection.useUnicode">true</property> ZEL/Ndk  
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<property name="connection.characterEncoding">UTF-8</property> qo61O\qm  
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<!--连接的登录名--> ^OsA+Ea\  
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<property name="connection.username">root</property> 7X(rLd 6#  
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<property name="connection.password"></property> Km[]^;6  
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<!--是否将运行期生成的SQL输出到日志以供调试--> 4Sg<r,G  
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<property name="show_sql">true</property> +]A+!8%Z  
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<!--指定连接的语言--> Dm>T"4B`/  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> 6].yRNy"  
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<!--映射Student这个资源--> D_O5k|-V  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> 7YMxr3F  
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2．C3P0连接配置
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<!DOCTYPE hibernate-configuration j09mI$2y67  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" zi?qK?m  
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<!?JDBC驱动程序--> G/x3wR  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> @"q~AY  
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<!-- 连接数据库的URL--> Iu=pk@*O  
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<property name="connection.url"> D]t~S1ycG7  
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jdbc:mysql://localhost:3306/schoolproject B|$\

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</property> !1ie:z>s  
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<property name="connection.useUnicode">true</property> )a4E&D  
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<property name="connection.characterEncoding">UTF-8</property> Z&~k]R0y  
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<property name="connection.username">root</property> w3>Y7vxiz`  
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<property name="connection.password"></property> #Pe\Z/  
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<!-- C3P0连接池设定--> Z'*G'/*  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider [#H
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<property name="hibernate.c3p0.max_size">20</property> !5g)3St  
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<property name="hibernate.c3p0.min_size">5</property> sT;=7L<TA  
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<property name="hibernate.c3p0.timeout">120</property> L!G9O]WB  
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<property name="hibernate.c3p0.max_statements">100</property> 3rXL0&3w%  
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<property name="hibernate.c3p0.idle_test_period">120</property> &gKP6ANx2  
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<property name="hibernate.c3p0.acquire_increment">2</property> yK @X^jf  
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<property name="show_sql">true</property> ek+8hnkh  
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3．proxool连接池 SqT"/e]b'  
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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 XQ|j5]  
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<?xml version="1.0" encoding="UTF-8"?> #L1yL<'  
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<proxool> A`r$fCt1Vi  
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<alias>DBPool</alias> J4R  
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<!--proxool只能管理由自己产生的连接--> }M"'K2_Z  
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<driver-url> S+\Mt+o  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 jWb\"0)  
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<driver-class>com.mysql.jdbc.Driver</driver-class> |GLn 9vw7S  
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<driver-properties> HpgN$$\@  
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<property name="user" value="root"/> =<tJAoVV  
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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 p44uozbK  
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收,超时的销毁--> OKNs (H  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> !*QA;*e  
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用户连接就不会被接受--> &^Q~G>A  
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<maximum-new-connections>20</maximum-new-connections> b*%WAVt2T  
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<prototype-count>5</prototype-count> :~YyHX  
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等待请求数由maximum-new-connections决定--> iegPEb  
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<maximum-connection-count>100</maximum-connection-count> %li{VDb  
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<minimum-connection-count>10</minimum-connection-count> E52:c]<'m  
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(2)配置hibernate.cfg.xml文件 P6Ol+SI#m  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" ~1z8G>R  
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<session-factory > _-nN( ${{  
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<property name="hibernate.connection.provider_class"> aQ3vG08L>  
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<property name="hibernate.proxool.pool_alias">DBPool</property> trA `l/  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> 8TM=AV  
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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
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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 /R?uxhV  
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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。 2Nzcej  
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(4) dialect是声明ＳＱＬ语句的方言 Vi~+C@96  
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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。 5.;$9~d  

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(6) <mapping >资源文件映射 WWzns[$f  
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4． JNDI连接池，数据源已经由应用服务配置好(如Web服务器)，Hibernate需要做的只是通过JNDI名查找到此数据源。应用服务器将连接池对外显示为JNDI绑定数据源，它是javax.jdbc.Datasource类的一个实例。只要配置一个Hibernate文件，如： y$W3\`2q  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 V,,iKr@TG  

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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory ~UFsiVpL  
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hibernate.transaction.manager_loopup_class = 09i[2n;O  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect bm|8Jbsb&