hibernate连接池

1．Hibernate默认连接池 ({87311%  
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<?xml version='1.0' encoding='UTF-8'?> lZ'-?xo  
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<!DOCTYPE hibernate-configuration s8Xort&  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" LSS3(l[,:  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> ,Y6Me+5B  
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<!-- 连接数据库的URL--> >vF=}1_L  
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<property name="connection.url"> o|FRG{TJ  
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jdbc:mysql://localhost:3306/schoolproject WLqwntzk  
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<property name="connection.useUnicode">true</property> u2,V34b-  

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<property name="connection.characterEncoding">UTF-8</property> l6IpyIex  
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<!--连接的登录名--> ~ x- R78'  

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<property name="connection.username">root</property> WB<_AIt+  
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<property name="connection.password"></property> {PZNJ 2~  
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<property name="show_sql">true</property> {fW(e?8)  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> xO"fg9a  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> %QH "x`;  
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2．C3P0连接配置 Qvo(2(  
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<!DOCTYPE hibernate-configuration *;b.x"  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" /3`#ldb%}  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> <5rs~  
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<!-- 连接数据库的URL--> HRP4"#9R  
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<property name="connection.url"> 4JF)w;X}  
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jdbc:mysql://localhost:3306/schoolproject e`gOc*  
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<property name="connection.useUnicode">true</property> "o.V`Bj  
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<property name="connection.characterEncoding">UTF-8</property> &+F|v(|r  
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<property name="connection.username">root</property> `-qRZh@E  
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<!-- C3P0连接池设定--> MR8\'0]  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider Lbb{z  
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<property name="hibernate.c3p0.max_size">20</property> 7+^9"k7  
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<property name="hibernate.c3p0.min_size">5</property> ma4Pmk  
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<property name="hibernate.c3p0.timeout">120</property> +%yVW f  
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<property name="hibernate.c3p0.max_statements">100</property> #XSs.i{  
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<property name="hibernate.c3p0.idle_test_period">120</property> />1Ndj  
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<property name="hibernate.c3p0.acquire_increment">2</property> 43_;Z| T  
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3．proxool连接池 >:5^4/fo*  
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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 UsT+o  
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<proxool> IfyyA  
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<alias>DBPool</alias> 6.]x@=Wm  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 9C-!I,  
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<driver-class>com.mysql.jdbc.Driver</driver-class> k M/cD`  
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<driver-properties> a-I3#3VJ@  
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<property name="user" value="root"/> @S3G>i  
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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 u&Ze$z  

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收,超时的销毁--> cO$ PK  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> 4H4U  
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<maximum-new-connections>20</maximum-new-connections> R#ayN*  
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等待请求数由maximum-new-connections决定--> L4th 7#  
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(2)配置hibernate.cfg.xml文件 VV/6~jy0  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" _akC^hT  
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<property name="hibernate.connection.provider_class"> \Q.Qos  
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<property name="hibernate.proxool.pool_alias">DBPool</property> ..yuEA  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> y7#$:+jQv  
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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 910Ym!\{:  
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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 X%W_cb2  
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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。 |fdr\t#'~  
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(4) dialect是声明ＳＱＬ语句的方言 =ECw'  
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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。 )|`eCzCB  
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(6) <mapping >资源文件映射 )&di c6r  
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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： <,qJ%kc  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 I}/o`oc  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory 'Im7^!-d  
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hibernate.transaction.manager_loopup_class = Iu6KW:x  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect FUzIuz 6