hibernate连接池

1．Hibernate默认连接池 'JkK0a2D  
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<?xml version='1.0' encoding='UTF-8'?> f kP WGd  
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<!DOCTYPE hibernate-configuration [FC%_R&&  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" oiFtPki  
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"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> 1ViDS  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> { ET+V  
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<!-- 连接数据库的URL--> CdEJ/G:  
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<property name="connection.url"> [2&Fnmjk}X  
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jdbc:mysql://localhost:3306/schoolproject +x4o#N  
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<property name="connection.useUnicode">true</property> PDGh\Y[AK,  
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<property name="connection.characterEncoding">UTF-8</property> -MOf[f^  
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<!--连接的登录名--> H:~LL0Md%  
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<property name="connection.username">root</property> M rVtxzH  
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<property name="connection.password"></property> sS+9ly{9J  
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<!--是否将运行期生成的SQL输出到日志以供调试--> 9D 0ujup  
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<property name="show_sql">true</property> NB,iC [e  
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<!--指定连接的语言--> 0}w>8L7i{  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> .m+KXlP  
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<!--映射Student这个资源--> 2I#fwsb  

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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> *.Kc-f4mP  
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</session-factory> FTk!Mn88  
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</hibernate-configuration> ZA:YoiaC#  
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2．C3P0连接配置 'rz*mR8  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" `cf&4Hn  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> 8)M .W  
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<property name="connection.url"> m]&d TZV  
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jdbc:mysql://localhost:3306/schoolproject ("IRv>} 0  
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<property name="connection.useUnicode">true</property> pn'*w1i  
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<property name="connection.characterEncoding">UTF-8</property> 8Zwq:lV Q  
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<property name="connection.username">root</property> 8[xb+_  
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<property name="connection.password"></property> o6oZk0  
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<!-- C3P0连接池设定--> a^~l[HSF  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider .GkH^9THP  
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<property name="hibernate.c3p0.max_size">20</property> z<s]Z  
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<property name="hibernate.c3p0.min_size">5</property> J/ <[irC  
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<property name="hibernate.c3p0.timeout">120</property> H|Q)Tp Lk  
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<property name="hibernate.c3p0.max_statements">100</property> F) < f8F  
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<property name="hibernate.c3p0.idle_test_period">120</property> aBol9`6  
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<property name="hibernate.c3p0.acquire_increment">2</property> @cSz!E}  
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<property name="show_sql">true</property> [u/g =^+u  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> =U3!D;XP  
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<!--映射Student这个资源--> StaX~J6=  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> '$4o,GA8  
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</session-factory> RLecKw&1{3  
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</hibernate-configuration> #![b9~%WTh  
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3．proxool连接池 ~kw[Aw3?D\  
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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 LW0't} z  
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<?xml version="1.0" encoding="UTF-8"?> ImyB4welo  
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Anything outside the "proxool" tag is ignored. --> $w#C;2k]N  
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<proxool> cYmMO[4YG'  
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<alias>DBPool</alias> RY&Wvkjh  
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<driver-url> k9'%8(7M:  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 M[@).4h  
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</driver-url> Quc9lL  
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<driver-class>com.mysql.jdbc.Driver</driver-class> nW!rM($q  
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<driver-properties> `lqMifD  
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<property name="user" value="root"/> FsTE.PT  
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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 o5@ l!NQ  
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收,超时的销毁--> "Z#97Jc+J  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> 0^?(;AK  
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<maximum-new-connections>20</maximum-new-connections> 1 nIb/nY  
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等待请求数由maximum-new-connections决定--> [^
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<minimum-connection-count>10</minimum-connection-count> _6;T /_R=
 
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(2)配置hibernate.cfg.xml文件 S6*3."Sk  
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<property name="hibernate.connection.provider_class"> ff**)Xdh  
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org.hibernate.connection.ProxoolConnectionProvider S^]i  
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<property name="hibernate.proxool.pool_alias">DBPool</property> #*:y2W%H  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> w&8gA[y*u  
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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\WnuQR[  
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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 a]|P rjPI  
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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。 &uI`Xq.  
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(4) dialect是声明ＳＱＬ语句的方言 js/N qf2>  
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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。 yf(VwU, x  
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(6) <mapping >资源文件映射 W]{mEB  
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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： /KFCq|;7s,  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 'z0@|a  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory  ~,Ck  
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hibernate.transaction.manager_loopup_class = X!V@jo9?  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect c&z@HEzV7