hibernate连接池

1．Hibernate默认连接池 B\~(:(OPM]  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> 3Zm;:v4y  
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<!-- 连接数据库的URL--> 5&}p'6*K  
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<property name="connection.url"> F7`[r9 $  
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jdbc:mysql://localhost:3306/schoolproject mzn#4;m$  
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<property name="connection.useUnicode">true</property> 7Dz-xM_?  
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<property name="connection.characterEncoding">UTF-8</property> ynZfO2kf  
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<property name="connection.username">root</property> k1HCPj  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> ;r95i1a'  
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2．C3P0连接配置 \?"kT}..  
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<!DOCTYPE hibernate-configuration REJHh\:.77  
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jdbc:mysql://localhost:3306/schoolproject 2IXtIE  
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<property name="connection.useUnicode">true</property> Ugme>60`'k  
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<property name="hibernate.c3p0.max_size">20</property> h=^UMat-  
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<property name="hibernate.c3p0.min_size">5</property> ,\N4tG1\  
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<property name="hibernate.c3p0.timeout">120</property> FsS.9 `B  
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<property name="hibernate.c3p0.max_statements">100</property> 35L\  
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<property name="hibernate.c3p0.idle_test_period">120</property> h.kjJF  
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<property name="hibernate.c3p0.acquire_increment">2</property> p!DOc8a.\e  
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3．proxool连接池 oDayfyy4y)  
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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 `?SC.KT  
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<!-- the proxool configuration can be embedded within your own application's. l dp$jrNLr  
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Anything outside the "proxool" tag is ignored. --> F{c8{?:
  
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<proxool> Zr=B8wuT  
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<alias>DBPool</alias> \U##b~Z,g  
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<driver-url> i0*Cs#(=h  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 q=-h#IF^  
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<driver-properties> 2 /*z5  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> /I{K_G@  
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<maximum-new-connections>20</maximum-new-connections> Qwve-[  
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等待请求数由maximum-new-connections决定--> Qr7|;l3  
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(2)配置hibernate.cfg.xml文件 w=: c7Y+  
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<property name="hibernate.proxool.pool_alias">DBPool</property> dM19;R@4  
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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+
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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^Qij!mB%  
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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。 RZSEcRlN  
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(4) dialect是声明ＳＱＬ语句的方言 hp}rCy|01  
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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。 ^L Xr4  
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(6) <mapping >资源文件映射 f`\J%9U_O  
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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：
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 @y0kX<M  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory kI5LG6  
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hibernate.transaction.manager_loopup_class = d~QJ}a  
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