hibernate连接池

1．Hibernate默认连接池 r/$+'~apTk  
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<?xml version='1.0' encoding='UTF-8'?> mSp-  
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<!DOCTYPE hibernate-configuration &=Gz[1 L  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" x1:+M]Da  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> D9zw' RY  
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<!-- 连接数据库的URL--> '%_1eaH  
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<property name="connection.url"> d)1)/Emyj  
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jdbc:mysql://localhost:3306/schoolproject T)&J}^j  
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<property name="connection.useUnicode">true</property> Rp `JF}~o  
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<property name="connection.characterEncoding">UTF-8</property> 7F;"=DarOE  
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<!--连接的登录名--> `au(' xi<  
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<property name="connection.username">root</property> hLPg=8nJ_  
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<property name="connection.password"></property> vpcHJ^19  
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<property name="show_sql">true</property> `2c>M\c4U  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> e:hkWcV  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> nv1'iSEeOl  
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</session-factory> g9|B-1[  
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2．C3P0连接配置 Oe4 l` =2  
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<!DOCTYPE hibernate-configuration g66=3c9</6  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" nkTH#WTfR  
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"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> [Av#Z)R  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> {MdxIp[  
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<property name="connection.url"> fiOc;d8  
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jdbc:mysql://localhost:3306/schoolproject | qtdmm  
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</property> X).UvPZ/  
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<property name="connection.useUnicode">true</property> w]GoeIg({  
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<property name="connection.username">root</property> jcHs!   
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<!-- C3P0连接池设定--> :zfnp,Gv  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider HmKvu"3  
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<property name="hibernate.c3p0.max_size">20</property> c+?L?s`"  
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<property name="hibernate.c3p0.min_size">5</property> 6g4CUP'Y  
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<property name="hibernate.c3p0.timeout">120</property> {6Lkh  
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<property name="hibernate.c3p0.max_statements">100</property> rt$z&#M  
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<property name="hibernate.c3p0.idle_test_period">120</property> XRXKO>4q  
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<property name="hibernate.c3p0.acquire_increment">2</property> kwNXKn/
 
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> 0CS^S1/[B`  
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3．proxool连接池 6;Cr92  
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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 &<@{ d  
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Anything outside the "proxool" tag is ignored. --> z/ T|  
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<alias>DBPool</alias> #[sC H  
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<driver-url> \|R`wFn^P  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 598xV|TON  
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<driver-class>com.mysql.jdbc.Driver</driver-class> 9rB^)eV  
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<driver-properties> 'Twi @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 -#<,i'  
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收,超时的销毁--> NXeo&+F  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> 51x^gX|  
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用户连接就不会被接受--> pKEMp&geo  
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<maximum-new-connections>20</maximum-new-connections> BD4.sd+H,  
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<prototype-count>5</prototype-count> NPB':r-8  
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等待请求数由maximum-new-connections决定--> 1>1|>%  
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<maximum-connection-count>100</maximum-connection-count> w-\fCp )  
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<minimum-connection-count>10</minimum-connection-count> ![vc/wuf  
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(2)配置hibernate.cfg.xml文件 Q?Nzt;)!.  
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<property name="hibernate.connection.provider_class"> -p;oe}|  
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<property name="hibernate.proxool.pool_alias">DBPool</property> ~/#?OLj(T  
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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 ICTtubjV"  
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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 P3yiJ|vP  
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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。 Hb+#*42v  
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(4) dialect是声明ＳＱＬ语句的方言 n>0dz#  
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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。 KVcZ@0[S  
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(6) <mapping >资源文件映射 Vtg/,1KQ  
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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 >YBpB,WND  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory tN{t-xUgk  
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hibernate.transaction.manager_loopup_class = uBTT {GGQ  
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org.hibernate.transaction.JBossTransactionManagerLookup  mo,l`UL  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect ?Bzi#Z