hibernate连接池

1．Hibernate默认连接池 &,4^LFZW  
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<?xml version='1.0' encoding='UTF-8'?> L"rL
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<!DOCTYPE hibernate-configuration L%ND?'@  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" !u.{<51b  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> b#FN3AsR  
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<!-- 连接数据库的URL--> !ge,]@/  
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<property name="connection.url"> v_J\yW'K  
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jdbc:mysql://localhost:3306/schoolproject WZ&/l 65J  
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<property name="connection.useUnicode">true</property> EB)j&y_  

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<property name="connection.characterEncoding">UTF-8</property> H6 ( ~6Bp5  
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<!--连接的登录名--> M6vW}APH[n  
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<property name="connection.username">root</property> eXx6b~D  
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<property name="connection.password"></property> >^ 0JlL`XG  
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<property name="show_sql">true</property> Y=sRVypJ  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> (P~Jzp9u  
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<!--映射Student这个资源--> `0uKJFg  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> ]|<PV5SY3.  
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2．C3P0连接配置 N5#qox$D  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" p/ pVMR  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> T#6']D  
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<property name="connection.url"> 5'@J}7h  
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jdbc:mysql://localhost:3306/schoolproject 0){%4  
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</property> (9*s:)zD-  
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<property name="connection.useUnicode">true</property> +L;[-]E8  
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<property name="connection.username">root</property> "Ol;0>$  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider v\rOs+.s  
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<property name="hibernate.c3p0.max_size">20</property> P{)H7B>  
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<property name="hibernate.c3p0.min_size">5</property> Y:&1;`FBZ  
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<property name="hibernate.c3p0.timeout">120</property> cCFSPT2fq[  
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<property name="hibernate.c3p0.max_statements">100</property> <]/`#Xgh  
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<property name="hibernate.c3p0.idle_test_period">120</property> 2n?\tOm(V  
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<property name="hibernate.c3p0.acquire_increment">2</property> vNLf)B  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> mvVVPf9  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> /AJ^wY  
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</hibernate-configuration>
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3．proxool连接池 4I"QT(;  
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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 174H@  
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<!-- the proxool configuration can be embedded within your own application's. ex'd^y  
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Anything outside the "proxool" tag is ignored. --> )7q;Fm_/  
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<proxool> .{7?Y;_(  
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<alias>DBPool</alias> +SPC@E_v  
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<driver-url> RK'3b/T  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 %E1~I\n:F  
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<driver-class>com.mysql.jdbc.Driver</driver-class> XZd !c Ff  
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<driver-properties> {zbH.V[  
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<property name="user" value="root"/> ?aSL'GI  
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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 @#VxjXW^  
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收,超时的销毁--> E'XFn'  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> &JfyXM[]  

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用户连接就不会被接受-->
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<maximum-new-connections>20</maximum-new-connections> g'pE z  
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<prototype-count>5</prototype-count> V_+3@C  
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等待请求数由maximum-new-connections决定--> /^#} \<;  
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<maximum-connection-count>100</maximum-connection-count> E_ mgYW*5  
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<minimum-connection-count>10</minimum-connection-count> NNe'5q9  
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(2)配置hibernate.cfg.xml文件 'J!P:.=a>  
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<property name="hibernate.connection.provider_class"> }O o  
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org.hibernate.connection.ProxoolConnectionProvider ;K:.*sAa  
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<property name="hibernate.proxool.pool_alias">DBPool</property>
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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 V$:v~*Y9  
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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 L#NPt4Sz+  
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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。 /B1NcRS  
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(4) dialect是声明ＳＱＬ语句的方言 \&W~nYXq"  
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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。 L0uN|?}  
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(6) <mapping >资源文件映射 N %0F[sY6  
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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： (c[|k  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 %X#Wc:b  
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory 'z+8;g.ekO  
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hibernate.transaction.manager_loopup_class = }0f[x ?V  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect /4=O^;