String strCon = "jdbc:mysql://122.114.147.148:3306/ddd";  //連接字符串
            String strUser = "數據庫用戶名";               //
            String strPwd = "口令";                  //"
            System.out.println("正在連接數據庫...");                

try {  //監控異常
                  Class.forName("com.mysql.jdbc.Driver");  //
 
加載驅動程序
                  Connection con;
                  //獲得連接對象
                  con = DriverManager.getConnection(strCon, strUser, strPwd);
                  System.out.println("成功連接到數據庫。");
                  Statement sta = con.createStatement();    //創建語句對象
                  //執行SQL語句
                  
                  String strSql 
 
= "select a.車次 ,a.列車類型,a.開車時間,b.到達時間,a.車站,b.車站,CONCAT(truncate((b.運行時間-a.運行時間)/60,0),‘小時‘,mod((b.運行時間-a.運行時間),60),‘分鐘‘)  as 運行時間,b.硬座-a.硬座+5 as 硬座 from  (select * from sjc2222 where 車站 like ‘%"+textField_3.getText()+"%‘)a,(select * from sjc2222 where 車站 like ‘%"+textField_4.getText()+"%‘)b where a.車次 = b.車次 and a.站序 < b.站序  order by a.開車時間 asc";

                  ResultSet rs
 
=sta.executeQuery(strSql);

                  while(rs.next()){
                      Vector v = new Vector ();
                      v.add(rs.getString("a.車次"));
                      v.add(rs.getString("a.列車類型"));
                      v.add(rs.getString("a.開車時間"));
                      v.add(rs.getString("b.到達時間"));
                      v.add(rs.getString("a.車站"));
                      v.add(rs.getString("b.車站"));
                      v.add(rs.getString("運行時間"));
                      v.add(rs.getString("硬座"));
                      dtm1.addRow(v);
                      System.out.println(v);
                    }    
    


                    System.out.println(table_1.getRowCount());
                    if(table_1.getRowCount() == 1){
                        table_1.setVisible(false);                        
                    }else{
                        table_1.setVisible(true);
                    }
                  
                  rs.close();sta.close(); con.close();  

                } catch (ClassNotFoundException cnfe) { cnfe.printStackTrace(); }
                catch (SQLException sqle) { sqle.printStackTrace(); }

JAVA 連接MYSQL數據庫操作