returninfo.java

JAVA实现的图书管理系统

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.sql.*;
public class ReturnInfo extends JFrame implements ActionListener
{
	DataBaseManager db=new DataBaseManager();
	ResultSet rs;
	JPanel panel1,panel2;
	Container c;
	JLabel TipLabel=new JLabel("输入还书者姓名和书名点击确定，将调出此书的相关信息");
	JLabel ReturnedBookStudentLabel,ReturnedBookNameLabel,
	       ReturnedDateLabel,ReturnedCommentLabel;
	JTextField ReturnedBookStudentTextField,ReturnedBookNameTextField,
	           ReturnedDateTextField,ReturnedCommentTextField;
	JButton ClearBtn,YesBtn,UpdateBtn,CancelBtn;
	public ReturnInfo()
	{
		super("修改书籍还入信息");
		c=getContentPane();
		c.setLayout(new BorderLayout());
		c.add(TipLabel,BorderLayout.NORTH);
		ReturnedBookStudentLabel=new JLabel("还书者姓名",JLabel.CENTER);
		ReturnedBookNameLabel=new JLabel("书名",JLabel.CENTER);
		ReturnedDateLabel=new JLabel("还书日期",JLabel.CENTER);
		ReturnedCommentLabel=new JLabel("备注",JLabel.CENTER);
		ReturnedBookStudentTextField=new JTextField(15);
		ReturnedBookNameTextField=new JTextField(15);
		ReturnedDateTextField=new JTextField(15);
		ReturnedCommentTextField=new JTextField(15);
		panel1=new JPanel();
		panel1.setLayout(new GridLayout(4,2));
		panel1.add(ReturnedBookStudentLabel);
		panel1.add(ReturnedBookStudentTextField);
		panel1.add(ReturnedBookNameLabel);
		panel1.add(ReturnedBookNameTextField);
		panel1.add(ReturnedDateLabel);
		panel1.add(ReturnedDateTextField);
		panel1.add(ReturnedCommentLabel);
		panel1.add(ReturnedCommentTextField);
		c.add(panel1,BorderLayout.CENTER);
		panel2=new JPanel();
		panel2.setLayout(new GridLayout(1,4));
		ClearBtn=new JButton("清空");
		YesBtn=new JButton("确定");
		UpdateBtn=new JButton("更新");
		CancelBtn=new JButton("取消");
		ClearBtn.addActionListener(this);
		YesBtn.addActionListener(this);
		UpdateBtn.addActionListener(this);
		UpdateBtn.setEnabled(false);
		CancelBtn.addActionListener(this);
		panel2.add(ClearBtn);
		panel2.add(YesBtn);
		panel2.add(UpdateBtn);
		panel2.add(CancelBtn);
		c.add(panel2,BorderLayout.SOUTH);
	}
	public void actionPerformed(ActionEvent e)
	{
		if(e.getSource()==ClearBtn)
		{
			ReturnedBookStudentTextField.setText("");
		        ReturnedBookNameTextField.setText("");
		        ReturnedDateTextField.setText("");
		        ReturnedCommentTextField.setText("");
		}
		else if(e.getSource()==CancelBtn)
		{
			this.dispose();
		}
		else if(e.getSource()==YesBtn)
		{
			try
			{
				String strSQL="select studentName,bookName,borrowDate,com from BookBrowse where studentName='"+
			        ReturnedBookStudentTextField.getText().trim()+"'and bookName='"+
			        ReturnedBookNameTextField.getText().trim()+"'";
			        rs=db.getResult(strSQL);
			        if(!rs.first())
			        {
			        	JOptionPane.showMessageDialog(null,"此学生没有借过书！或者没有此书！");
			     
			        }
			        else
			        {
			        	ReturnedBookStudentTextField.setText(rs.getString(1));
			        	ReturnedBookNameTextField.setText(rs.getString(2));
			        	ReturnedDateTextField.setText(rs.getString(3));
			        	ReturnedCommentTextField.setText(rs.getString(4));
			        	UpdateBtn.setEnabled(true);
			        	
			        }
			        }
			catch(Exception ex)
		        {
			    System.out.println(ex.toString());
		        }
			
			
		}
		else if(e.getSource()==UpdateBtn)
		{
			String strSQL="update bookBrowse set returnDate=TO_DATE('"+
			ReturnedDateTextField.getText().trim()+"'),com='"+
			ReturnedCommentTextField.getText().trim()+"' where studentName='"+
			ReturnedBookStudentTextField.getText().trim()+"'and bookName='"+
			ReturnedBookNameTextField.getText().trim()+"'";
			if(db.updateSql(strSQL))
			{
				JOptionPane.showMessageDialog(null,"更新成功！");
				db.closeConnection();
				this.dispose();
			}
			else
			{
				JOptionPane.showMessageDialog(null,"更新失败！");
				db.closeConnection();
				this.dispose();
			}
		}
	}
}