hibernate连接池

1．Hibernate默认连接池 .779pT!,M
 
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<?xml version='1.0' encoding='UTF-8'?> qPX~@^`9  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" cz#rb*b  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> (Y.k8";)`  
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<property name="connection.url"> gq4Tb c oA  
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jdbc:mysql://localhost:3306/schoolproject M)J5;^["  
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<property name="connection.useUnicode">true</property> v}}F,c(f  
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<property name="connection.characterEncoding">UTF-8</property> ajbA\/\G;  
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<property name="connection.username">root</property> zsEc(  
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<property name="connection.password"></property> . oF &Ff/[  
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<property name="show_sql">true</property> O@T9x$  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> dc+>m,3$  
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<!--映射Student这个资源--> #5Qpu  
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<mapping resource="com/wqbi/model/pojo/student.hbm.xml" /> vONasD9At  
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</session-factory> jnkR}wAA  
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2．C3P0连接配置 ,Q3T Tno ,  
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PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" NJ%P/\ C  
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<property name="connection.driver_class">com.mysql.jdbc.Driver</property> *[Imn\hu  
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<property name="connection.url"> /m!BY}4W  
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jdbc:mysql://localhost:3306/schoolproject <X#C)-.  
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</property> [>vLf2OID  
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<property name="connection.useUnicode">true</property> N_LM/of|D  
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<property name="connection.characterEncoding">UTF-8</property> 8$]1M,$r  
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<property name="connection.username">root</property> `{8K.(])s!  
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<property name="connection.password"></property> x[|}.Ew  
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<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider NYhB'C2  
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<property name="hibernate.c3p0.max_size">20</property> M.JA.I@XC  
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<property name="hibernate.c3p0.min_size">5</property> g%aYD
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<property name="hibernate.c3p0.timeout">120</property> E[OJ+ ;c  
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<property name="hibernate.c3p0.max_statements">100</property> xn

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<property name="hibernate.c3p0.idle_test_period">120</property> "BAK !N$9  
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<property name="hibernate.c3p0.acquire_increment">2</property> BqEI(c6  
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<property name="dialect">org.hibernate.dialect.MySQLDialect</property> UB@Rs|)  

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3．proxool连接池 ZT*ydln  
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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 yHYsZ,GE  
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Anything outside the "proxool" tag is ignored. --> T}Tp
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<proxool> q~Hn-5H4Q  
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<alias>DBPool</alias> ~i= _J3'  
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jdbc:mysql://localhost:3306/schoolproject?useUnicode=true&characterEncoding=UTF8 1y&\5kB  
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<driver-class>com.mysql.jdbc.Driver</driver-class> yZ7&b&2nLn  
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<driver-properties> Yu/ID!`Z  
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<property name="user" value="root"/> OG~gFZr)6  
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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 1UgEI"#a6g  
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收,超时的销毁--> 2ACCh4(/P  
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<house-keeping-sleep-time>90000</house-keeping-sleep-time> Ufj`euY  
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用户连接就不会被接受--> *U-4Sy  
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<maximum-new-connections>20</maximum-new-connections> .<?GS{6 N  
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<prototype-count>5</prototype-count> OKZV{Gja  
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等待请求数由maximum-new-connections决定--> fb7;|LF  
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<minimum-connection-count>10</minimum-connection-count> }Bh8=F3O Q  
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(2)配置hibernate.cfg.xml文件 Kn{4;Xk\  
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<property name="hibernate.connection.provider_class"> >uB?rGcM  
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<property name="hibernate.proxool.pool_alias">DBPool</property> e"cXun4nS=  
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<property name="hibernate.proxool.xml">proxoolconf.xml</property> uMv,zO5  
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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 W@IQ^ }E  
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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 MN>b7O \.?  
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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。 d-ko ^Y0  
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(4) dialect是声明ＳＱＬ语句的方言 `}\ "Aw c  
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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。 U/M>?G~  
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(6) <mapping >资源文件映射 TX/Xt7#R:  
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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： pki%vRY  
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hibernate.connection.datasource=java:/comp/env/jdbc/schoolproject //JNDI名 FV!
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hibernate.transaction.factory_class = org.hibernate.transaction.JTATransactionFactory 8,%^ M9zBP  
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hibernate.transaction.manager_loopup_class = ;(%QD 3>  
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hibernate.dialect=org.hibernate.dialect.MySQLDialect Om@;J%u/