commodityinputframe.java

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 import java.sql.*; 
import javax.swing.*; 
//import javax.swing.event.*;
import java.awt.*; 
import java.awt.event.*; 
import java.util.*; 

public class CommodityInputFrame extends JDialog 
{
	private Connection Commodityconnection; 
   	private Statement Commoditystatement; 
   	//private Statement InsertInputstatement; 
   	private ResultSet CommodityresultSet; 
   	private ResultSetMetaData rsMetaData;
   
    
    //GUI变量定义
	private JLabel CommoditySerialLabel ;
	private JLabel CommodityNameLabel ;
	private JLabel CommodityPriceLabel ;
	private JLabel CommodityDiscountLabel ;
	
   	private JTextField CommoditySerialField;
   	private JTextField CommodityNameField;
   	private JTextField CommodityPriceField;
   	private JTextField CommodityDiscountField;
   
	private JButton SubmmitButton ;
	private JButton cancelButton ;
	private JFrame parent; 
    
    public CommodityInputFrame(JFrame parent, boolean modal) 
    {
        super(parent, modal);
        this.parent = parent;
        pack();
        
        initComponents(); 
        
    }
    private void initComponents() 
    {
    	GridBagLayout layout = new GridBagLayout();
        Container contents = getContentPane();
        contents.setLayout(layout);

        GridBagConstraints constraints = new GridBagConstraints();

        setTitle ("商品信息录入窗口");
        addWindowListener(new WindowAdapter () 
        {
            public void windowClosing(WindowEvent event) 
            {
                setVisible(false);
        		dispose();
            }
        });
        
        CommoditySerialField = new JTextField(); // needed below
        CommoditySerialField.setPreferredSize(new Dimension(150, 25));
        CommoditySerialLabel = new JLabel();
        CommoditySerialLabel.setText("商 品 编 号：        ");
        CommoditySerialLabel.setLabelFor(CommoditySerialField);
        constraints.weightx = 100;
        constraints.weighty = 100;
        constraints.gridx = 0;
        constraints.gridy = 0;
        constraints.gridwidth = 1;
        constraints.gridheight = 1;
        contents.add(CommoditySerialLabel, constraints);
        constraints.gridx = 1;
        constraints.gridy = 0;
        constraints.gridwidth = 2;
        constraints.gridheight = 1;
        contents.add(CommoditySerialField, constraints);
        //2
        CommodityNameField = new JTextField(); // needed below
        CommodityNameField.setPreferredSize(new Dimension(150, 25));
        CommodityNameLabel = new JLabel();
        CommodityNameLabel.setText("商 品 名 称：        ");
        CommodityNameLabel.setLabelFor(CommodityNameField);
        constraints.gridx = 0;
        constraints.gridy = 1;
        constraints.gridwidth = 1;
        constraints.gridheight = 1;
        contents.add(CommodityNameLabel, constraints);
        constraints.gridx = 1;
        constraints.gridy = 1;
        constraints.gridwidth = 2;
        constraints.gridheight = 1;
        contents.add(CommodityNameField, constraints);
        //3
        CommodityPriceField = new JTextField(); // needed below
        CommodityPriceField.setPreferredSize(new Dimension(150, 25));
        CommodityPriceLabel = new JLabel();
        CommodityPriceLabel.setText("商 品 价 格：        ");
        CommodityPriceLabel.setLabelFor(CommodityPriceField);
        constraints.gridx = 0;
        constraints.gridy = 2;
        constraints.gridwidth = 1;
        constraints.gridheight = 1;
        contents.add(CommodityPriceLabel, constraints);
        constraints.gridx = 1;
        constraints.gridy = 2;
        constraints.gridwidth = 2;
        constraints.gridheight = 1;
        contents.add(CommodityPriceField, constraints);
        //4
        CommodityDiscountField = new JTextField(); // needed below
        CommodityDiscountField.setPreferredSize(new Dimension(150, 25));
        CommodityDiscountLabel = new JLabel();
        CommodityDiscountLabel.setText("商 品 折 扣：        ");
        CommodityDiscountLabel.setLabelFor(CommodityDiscountField);
        constraints.gridx = 0;
        constraints.gridy = 3;
        constraints.gridwidth = 1;
        constraints.gridheight = 1;
        contents.add(CommodityDiscountLabel, constraints);
        constraints.gridx = 1;
        constraints.gridy = 3;
        constraints.gridwidth = 2;
        constraints.gridheight = 1;
        contents.add(CommodityDiscountField, constraints);
		        
        JPanel buttonPanel = createButtonPanel(); // sets global loginButton
        constraints.gridx = 0;
        constraints.gridy = 4;
        constraints.gridwidth = 3;
        constraints.gridheight = 2;
        contents.add(buttonPanel, constraints);
        
        setSize( 500, 300 );
      	setResizable(false);
      	setLocation(200,100);	
    }
    
     private JPanel createButtonPanel() {

        JPanel panel = new JPanel();
        panel.setLayout(new BoxLayout(panel, 0));
        //panel.setSize( 490, 40 );
        //panel.setBorder(BorderFactory.createEtchedBorder());

        // login button (global variable)
        SubmmitButton = new JButton();
        SubmmitButton.setText("确  定");
        
        SubmmitButton.addActionListener(new ActionListener() 
        {
            public void actionPerformed(ActionEvent event) 
            {
                CommodityInfoInput();
            }
        });
        panel.add(SubmmitButton);

        // space
        panel.add(Box.createRigidArea(new Dimension(200,0)));

        // cancel button
        JButton cancelButton = new JButton();
        cancelButton.setText("返  回");
        
        cancelButton.addActionListener(new ActionListener() 
        {
            public void actionPerformed(ActionEvent event) 
            {
                dispose();
            }
        });
        panel.add(cancelButton);

        // space
        

        Vector buttons = new Vector(2);
        buttons.add(SubmmitButton);
        buttons.add(cancelButton);
        equalizeComponentSizes(buttons);
        buttons.removeAllElements(); // simplify gc
        return panel;
    } // createButtonPanel()


    private void equalizeComponentSizes(java.util.List components) {

        // Get the largest width and height
        int i = 0;
        Dimension maxPreferred = new Dimension(0,0);
        JComponent oneComponent = null;
        Dimension thisPreferred = null;
        for (i = 0; i < components.size(); ++i) {
            oneComponent = (JComponent)components.get(i);
            thisPreferred = oneComponent.getPreferredSize();
            maxPreferred.width =
                Math.max(maxPreferred.width, (int)thisPreferred.getWidth());
            maxPreferred.height =
                Math.max(maxPreferred.height, (int)thisPreferred.getHeight());
        }

        // reset preferred and maximum size since BoxLayout takes both
        // into account
        for (i = 0; i < components.size(); ++i) {
            oneComponent = (JComponent)components.get(i);
            oneComponent.setPreferredSize((Dimension)maxPreferred.clone());
            oneComponent.setMaximumSize((Dimension)maxPreferred.clone());
        }
    } // equalizeComponentSizes()
    
    private void CommodityInfoInput()
    {
   	   	
   	   if(
   		   CommoditySerialField.getText().equals( "" )||
   		   CommodityNameField.getText().equals( "" )||
   		   CommodityPriceField.getText().equals( "" )||
   		   CommodityDiscountField.getText().equals( "" ))
   		{
   			JOptionPane.showMessageDialog( this,"请填商品信息资料" ); 
         	//setTitle( "无记录显示" ); 
         	return; 	
   		}
   		
   		String url = "jdbc:odbc:VipQuery"; 
    	String username = ""; 
    	String password = ""; 
    	
    	
    	//加载驱动程序以连接数据库
      	try 
      	{ 
        	Class.forName( "sun.jdbc.odbc.JdbcOdbcDriver" ); 
        	Commodityconnection = DriverManager.getConnection( url, username, password ); 
      	} 
      	//捕获加载驱动程序异常
      	catch ( ClassNotFoundException cnfex ) 
      	{ 
        	System.err.println("装载 JDBC/ODBC 驱动程序失败。" ); 
        	cnfex.printStackTrace(); 
         	System.exit( 1 );  // terminate program 
      	} 
      	//捕获连接数据库异常
      	catch ( SQLException sqlex ) 
      	{ 
         	System.err.println( "无法连接数据库" ); 
         	sqlex.printStackTrace(); 
         	System.exit( 1 );  // terminate program 
      	}
      	
      	try 
      	{ 
      		 String CommodityQuery = "select * from COMMODITY_ID where 商品编号 = "+CommoditySerialField.getText()+"";
      		 String CommodityInput = "insert into COMMODITY_ID VALUES("
      		 					+ CommoditySerialField.getText()+",'"+CommodityNameField.getText()+"',"
      		 					+ CommodityPriceField.getText()+","+CommodityDiscountField.getText()+")";
      		
      		 Commoditystatement = Commodityconnection.createStatement();
         	 CommodityresultSet = Commoditystatement.executeQuery( CommodityQuery );  
         	 
         	 boolean moreRecords = CommodityresultSet.next();     
         	 
         	 if ( moreRecords ) 
      		 { 
         		JOptionPane.showMessageDialog( this,"对不起，此商品号已经被使用，请重新输入" ); 
         		//setTitle( "无记录显示" );
         		Commodityconnection.close(); 
         		return; 
      		 }  
      		 //InsertInputstatement =  Insertconnection.createStatement();
      		 int insert = Commoditystatement.executeUpdate( CommodityInput );//executeUpdate返回一个整型值
      		 
      		 if (insert == 1)
      		 {
      		 	JOptionPane.showMessageDialog( this,"商品信息录入成功！" );
      		 	CommoditySerialField.setText("");
   		   		CommodityNameField.setText("");
   		   		CommodityPriceField.setText("");
   		   		CommodityDiscountField.setText("");
   		   		
      		 } 
      		
      	} 
      	catch ( SQLException sqlex ) 
      	{ 
        	sqlex.printStackTrace(); 
      	}  
        
    }
}