hibernate连接池

1．Hibernate默认连接池 fsl ZJE  
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<!DOCTYPE hibernate-configuration Pn,>eD*g  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> !4a#);`G  
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<property name="connection.url"> C B`7KK  
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jdbc:mysql://localhost:3306/schoolproject EJP]E)  
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<property name="connection.useUnicode">true</property> x=Aq5*A0  
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<property name="connection.characterEncoding">UTF-8</property> ,1g_{dMx  
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<property name="connection.username">root</property> )QWhzY  
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<!--是否将运行期生成的SQL输出到日志以供调试--> F @<h:VVP  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> @eZBwFe  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> $bD`B'5  
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</session-factory> DSRmFxkk  
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2．C3P0连接配置 J>k 6`gw  
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<!DOCTYPE hibernate-configuration BsA'r+ho?H  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" :\I*_00!  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> Z:<an+v|5  
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<property name="connection.url"> UX[s5#  
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jdbc:mysql://localhost:3306/schoolproject ^<qi&*  
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<property name="connection.useUnicode">true</property> -
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<property name="connection.characterEncoding">UTF-8</property> F~qZIggD  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider K6 >\4'q  
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<property name="hibernate.c3p0.max_size">20</property> pqb`g@  
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<property name="hibernate.c3p0.min_size">5</property> oQ,<Yx%E3  
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<property name="hibernate.c3p0.timeout">120</property> 'fGKRd|)  
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<property name="hibernate.c3p0.max_statements">100</property> 7n.Oem  
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<property name="hibernate.c3p0.idle_test_period">120</property> !`RMXUV  
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<property name="hibernate.c3p0.acquire_increment">2</property> Eyjsbj8  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
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</session-factory> ZK'46lh  
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</hibernate-configuration> b^C27s  

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3．proxool连接池 1w(3!Ps+  
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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 85H\v_[  
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<?xml version="1.0" encoding="UTF-8"?> (@5`beEd  
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<!-- the proxool configuration can be embedded within your own application's. M1xsGa9h&  
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Anything outside the "proxool" tag is ignored. --> S<Gm*$[7  
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<proxool> l7qW)<r  
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<alias>DBPool</alias> bA#9'Qu^j  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 ?l?l<`sTO  
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<driver-class>com.mysql.jdbc.Driver</driver-class> hFv{?v  
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<driver-properties> I{g.V|+x  
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<property name="user" value="root"/> IUv#nB3  
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<property name="password" value=""/> M
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</driver-properties> +|obU9M  
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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 [5?Dov^j3  
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收,超时的销毁--> b~,e(D9DG  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> %5gdLm!p  
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用户连接就不会被接受--> } jJKE  
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<maximum-new-connections>20</maximum-new-connections> mYgfGPF`  
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等待请求数由maximum-new-connections决定--> zx}+Q B0  
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<minimum-connection-count>10</minimum-connection-count> 34u[#O{2  
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(2)配置hibernate.cfg.xml文件 ~o^|>]  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" ^}-l["u`  
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<property name="hibernate.connection.provider_class"> ;]-08lzO<4  
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<property name="hibernate.proxool.pool_alias">DBPool</property> ZwMVFC-d  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> w"9h_;'C_  
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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 uBww  
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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 h2zSOY{su  
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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。 |-=-/u1  
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(4) dialect是声明ＳＱＬ语句的方言 @H?OHpJ"`  
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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。 bW W!,-|R  
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(6) <mapping >资源文件映射 i\IpS@/{-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： rB+ (  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 %h ;oi/pe  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory HMUx/M.j  
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hibernate.transaction.manager_loopup_class = U=D;CjAh  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect J8~hIy6]