?? dbisopen.java
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package mmscenter;import java.sql.*;import java.util.*;import java.lang.*;public class DbIsOpen extends Engine{ protected Connection connection=null; protected Statement statement=null; protected java.lang.String password= ""; protected java.lang.String driver= "org.gjt.mm.mysql.Driver"; protected java.lang.String Url= "jdbc:mysql://"+Config.db_host+":3306/"+Config.db_name;//"jdbc:odbc:travel"; protected java.lang.String userID= "mms"; protected boolean dbIsOpen = false; public DbIsOpen() { super("DbIsOpen"); setDaemon(true); } public void Close(){ try { //closeStatement(); if(!connection.isClosed()) { connection.close(); } } catch(Throwable e){System.out.println(e);} connection = null; //dbIsOpen = false; } public Connection getConnection() throws SQLException{ if(connection != null && !connection.isClosed()) { dbIsOpen = true; return connection; } try{ Class.forName(driver); //DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver()); connection = DriverManager.getConnection (Url, userID, password); dbIsOpen = true; } catch(Exception e) { dbIsOpen = false; System.out.println("exception in getConnection " + e.getMessage()); } return connection ; } public void run(){ while(true){ try{ getConnection(); }catch(Exception e){ e.printStackTrace() ; } try{ Close(); }catch(Exception e){ e.printStackTrace() ; } try{ System.out.println("數據庫連接"+dbIsOpen); sleep(TimeConfig.TIME_ONE_MINUTE*2); }catch(Exception e){ } } } public static void main(String[] args) { DbIsOpen dbIsOpen1 = new DbIsOpen(); dbIsOpen1.startup(); try{ Thread.sleep(1000); }catch(Exception e){ e.printStackTrace() ; } }}?? 快捷鍵說明
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