hibernate连接池

1．Hibernate默认连接池 \kZ?
 
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<!DOCTYPE hibernate-configuration m^zUmrj[  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" yK=cZw%D  
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<session-factory > H*PSR  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> ;@oN s-  
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<!-- 连接数据库的URL--> ]>5/PD,wWy  
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<property name="connection.url"> z7fp#>uw  
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jdbc:mysql://localhost:3306/schoolproject 6a~|K-a6  
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<property name="connection.useUnicode">true</property> ;DfY#-  
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<property name="connection.characterEncoding">UTF-8</property> 52Z2]T c,  
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<!--连接的登录名--> K0|FY=#2y  
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<property name="connection.username">root</property> a%JuC2  
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<property name="connection.password"></property> B"1c  
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<property name="show_sql">true</property> 7rc0yB  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> /$Nsd  
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<!--映射Student这个资源--> r= `Jn6@  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> Cgk<pky1  
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2．C3P0连接配置 e'NJnPO  
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<?xml version='1.0' encoding='UTF-8'?> BA:VPTZq  
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<!DOCTYPE hibernate-configuration PO:{t  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" \;Biq`  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> <iC(`J$D  
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<property name="connection.url"> /W<;Z;zk  
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jdbc:mysql://localhost:3306/schoolproject \~$#1D1f  
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<property name="connection.useUnicode">true</property> '-~~-}= sJ  
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<property name="connection.characterEncoding">UTF-8</property> O_7|C\]  
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<property name="connection.username">root</property> 5U$0F$BBp  
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<!-- C3P0连接池设定--> 8{sGNCvU  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider /PIcqg  
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<property name="hibernate.c3p0.max_size">20</property> }5"u[Z.  
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<property name="hibernate.c3p0.min_size">5</property> <RL]  
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<property name="hibernate.c3p0.timeout">120</property> i9x+A/o[  
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<property name="hibernate.c3p0.max_statements">100</property> eJ-nKkg~a  
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<property name="hibernate.c3p0.idle_test_period">120</property> c]!V'#U  
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<property name="hibernate.c3p0.acquire_increment">2</property> + {'.7#  
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<property name="show_sql">true</property> 4o5t#qP5$S  
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<!--指定连接的语言--> K{+2G&i  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> O;3>sLgc  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> #GFr`o0$^  
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</session-factory> {_*yGK48n  
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3．proxool连接池 K(|}dl:  
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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 _Z\

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<?xml version="1.0" encoding="UTF-8"?> NxILRKwO  
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Anything outside the "proxool" tag is ignored. --> $:^td/p J  
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<proxool> !n%j)`0M  
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<alias>DBPool</alias> wgA_38To  
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<driver-url> I`#JwMU;m  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 yh=N@Z*zP  
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<driver-class>com.mysql.jdbc.Driver</driver-class> :v 4]D4\o  
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<driver-properties> LgYq.>Nl9  
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<property name="user" value="root"/> 2T`!v  
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<property name="password" value=""/> [S<";l8  
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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 =w^M{W.w  
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收,超时的销毁--> H[|~/0?K  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> T 1t6p&  
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<maximum-new-connections>20</maximum-new-connections> @lt#Nz  
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等待请求数由maximum-new-connections决定--> (jl D+Y_  
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<maximum-connection-count>100</maximum-connection-count> &AbNWtCV+G  
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<minimum-connection-count>10</minimum-connection-count> T!WT;A  
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(2)配置hibernate.cfg.xml文件 G.abql  
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<property name="hibernate.connection.provider_class"> /dQl)tL  
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<property name="hibernate.proxool.pool_alias">DBPool</property> >#~& -3  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> RD'Q :W  
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</session-factory> 4(~L#}:r!  
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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 ^f &XQQY  
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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 `PdQX.wN  
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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。 ia~HQ$'+n  
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(4) dialect是声明ＳＱＬ语句的方言 Un(aW=PQ0  
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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。 9ni1f{k  
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(6) <mapping >资源文件映射 )!Z*.?  
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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： He/8=$c%  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 vq0Tk bzs  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory <8i//HOE  
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hibernate.transaction.manager_loopup_class = n;Q7X>-f8`  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect F>6|3bOR