MyEclipse中使用Proxool+mysql连接池的方法
该例子是针对一下情形使用:
(1)使用的是mysql数据库;
(2)适用于java应用程序,如果是web程序还需要修改web.xml。
首先,新建proxoolconf.xml文件,页面内容如下:
<?xml version="1.0" encoding="UTF-8"?> <!-- the proxool configuration can be embedded within your own application's. Anything outside the "proxool" tag is ignored. --> <something-else-entirely> <proxool> <!--连接池的别名--> <alias>DBPool</alias> <!--proxool只能管理由自己产生的连接--> <driver-url> jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF8 </driver-url> <!—JDBC驱动程序--> <driver-class>com.mysql.jdbc.Driver</driver-class> <driver-properties> <property name="user" value="root"/> <property name="password" value=""/> </driver-properties> <!-- 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 收,超时的销毁--> <house-keeping-sleep-time>90000</house-keeping-sleep-time> <!-- 指因未有空闲连接可以分配而在队列中等候的最大请求数,超过这个请求数的 用户连接就不会被接受--> <maximum-new-connections>20</maximum-new-connections> <!-- 最少保持的空闲连接数--> <prototype-count>5</prototype-count> <!-- 允许最大连接数,超过了这个连接,再有请求时,就排在队列中等候,最大的 等待请求数由maximum-new-connections决定--> <maximum-connection-count>100</maximum-connection-count> <!-- 最小连接数--> <minimum-connection-count>10</minimum-connection-count> </proxool> </something-else-entirely>
然后,针对hibernate.cfg.xml文件进行修改成如下:
<?xml version='1.0' encoding='utf-8'?> <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> <!-- Generated by MyEclipse Hibernate Tools. --> <hibernate-configuration> <session-factory> <property name="hibernate.connection.provider_class"> org.hibernate.connection.ProxoolConnectionProvider </property> <property name="hibernate.proxool.pool_alias">DBPool</property> <property name="hibernate.proxool.xml">proxoolconf.xml</property> <property name="dialect"> org.hibernate.dialect.MySQLDialect </property> <property name="connection.url"> jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=GBK </property> <property name="connection.username">user</property> <property name="connection.password">password</property> <property name="connection.driver_class"> com.mysql.jdbc.Driver </property> <property name="myeclipse.connection.profile">tx</property> <property name="hibernate.current_session_context_class">thread</property> <mapping resource="dao/User.hbm.xml" /> </session-factory> </hibernate-configuration>
这样,配置就已经完成了。
写一个测试程序:
UserDAO daydao = new UserDAO(); JAXPConfigurator.configure(CONFIG_FILE_LOCATION, false);
Transaction tran = daydao.getSession().beginTransaction(); User day = new User(); User temp = daydao.findById("wang"); if (temp == null) { day.setUsername("wang"); day.setPassword("123456"); try { daydao.save(day); tran.commit(); } catch (Exception e){} } List findAll = daydao.findAll(); java.util.List<User> d = findAll; for (User o:d) { System.out.print(o.getUsername() + " "); System.out.print(o.getPassword() + " "); System.out.println(); }
能够成功运行,OK了。
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