hibernate连接池

1．Hibernate默认连接池 I%;Rn:zl  
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<?xml version='1.0' encoding='UTF-8'?>  /,1SE(  
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<!DOCTYPE hibernate-configuration <CNE>@-f
 
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" T>\nWancQM  
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<hibernate-configuration> tk`: CT *  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> -d|BO[4j  
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<!-- 连接数据库的URL--> ojN`#%X  
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<property name="connection.url"> <KHv|)ak  
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jdbc:mysql://localhost:3306/schoolproject Qy{NS.T  
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<property name="connection.useUnicode">true</property> /yx=7<  
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<property name="connection.characterEncoding">UTF-8</property> 8_"3Yb`f  
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<!--连接的登录名--> i'Y-V]->  
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<property name="connection.username">root</property> g/OI|1a  
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<property name="connection.password"></property> f|X[gL,B  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> M]J[6EW  
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<!--映射Student这个资源--> :L]-'\y  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> _mw13jcN]  
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</session-factory> '!pAnsXfO  
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</hibernate-configuration> ; Zh9^0  
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2．C3P0连接配置 ~@xT]D!BQ  
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<!DOCTYPE hibernate-configuration 0xN!DvCg>.  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" lrCm9Oy  
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"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> W5pn;u- sz  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> $6W3EOl  

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<property name="connection.url"> yGRR8F5>(  
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jdbc:mysql://localhost:3306/schoolproject *K`x
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<property name="connection.useUnicode">true</property> D2{L=  
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<property name="connection.characterEncoding">UTF-8</property> :RHm*vt  
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<property name="connection.username">root</property> >#INEO  
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<property name="connection.password"></property> F9%,MSt  
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<!-- C3P0连接池设定--> uN8/Q2   
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider rjXnDh]MC  
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<property name="hibernate.c3p0.max_size">20</property> 7"#f!.E  
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<property name="hibernate.c3p0.min_size">5</property> >[EBpYi  
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<property name="hibernate.c3p0.timeout">120</property> ;ed#+$Na  
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<property name="hibernate.c3p0.max_statements">100</property> J||E;=%f-Q  
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<property name="hibernate.c3p0.idle_test_period">120</property> },&h[\N{6  
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<property name="hibernate.c3p0.acquire_increment">2</property> .8K6C]gw  
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<property name="show_sql">true</property> !W~QT}  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> Xo\S9,s{  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> +mLD/gK`  
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3．proxool连接池 J0sGvj{  
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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 %A)538F  
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Anything outside the "proxool" tag is ignored. --> O:IQ!mzV5  
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<alias>DBPool</alias> [~)x<=H8{  
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<driver-url> nmg{%P  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 j8a[
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<driver-class>com.mysql.jdbc.Driver</driver-class> |IN[uQ  
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<driver-properties> QD4:W"i  
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<property name="user" value="root"/> yLqF ,pvO  

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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 $DE&J4K  
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收,超时的销毁--> `{o$F ::(  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> ``4?a7!!  
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用户连接就不会被接受--> F 7LiG9H6`  
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<maximum-new-connections>20</maximum-new-connections> SiTe
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等待请求数由maximum-new-connections决定--> hB>^'6h+  
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<minimum-connection-count>10</minimum-connection-count> 6tm\L  
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(2)配置hibernate.cfg.xml文件 2Y+:,ud\  
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<property name="hibernate.connection.provider_class"> (/?R9T[V&^  
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<property name="hibernate.proxool.pool_alias">DBPool</property> i0ybJOa4  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> a.,_4;'UE1  
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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 D]u=PqHk2  
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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 [`n
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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。 fSI%c3  
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(4) dialect是声明ＳＱＬ语句的方言 9L HuS  
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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。 tcOnM w  
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(6) <mapping >资源文件映射 l%<c6;  
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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： %U?)?iZdL  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 `bqz
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory wd+O5Lr.R  
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hibernate.transaction.manager_loopup_class =  ?Ib}  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect Vp7b4n<