java可视化界面操作数据库编程

wing.JTextField;importjavax.swing.SwingUtilities;lassSchoolInfoGuiimplementsActionListener{privateJFramejFrame;privateJPaneljContentPane;privateJLabellblName=null;privateJTextFieldtfName=null;privateJLabellblRegion=null;boBoxcbRegion=null;privateJLabellblArea=null;privateJTextFieldtfArea=null;privateJLabellblPopu=null;privateJTextFieldtfPopu=null;privateJLabellblGdp=null;privateJTextFieldtfGDP=null;privateJButtonbtnAdd=null;privateJButtonbtnDel=null;privateJButtonbtnModify=null;privateJButtonbtnQuery=null;privateJButtonbtnUpPage=null;privateJButtonbtnDownPage=null;privateJTabletable=null;TableModeltm=null;JScrollPanejsp=null;privateJTextFieldgetTfName(){if(tfName==null){tfName=newJTextField();tfName.setBounds(newRectangle(89,17,173,27));}returntfName;}boBoxgetCbRegion(){if(cbRegion==null){