b_insert.java

宿舍管理系统（包括论文）： 该系统是用JAVA语言编写的学生公寓管理系统,本系统在研制开发过程中

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

class B_insert extends JFrame implements ActionListener
{
	JLabel l1,l2,l3,l4;
	JButton b1,b2;
	JTextField t1,t2,t3,t4;
	Connection con;
	Statement sta;
	String conURL="jdbc:mysql://localhost/login?user=root&password=root";
	ResultSet rs;
	B_insert()
	{
		super("学生信息添加");
		setBounds(200,200,400,300);
		JPanel p=new JPanel();
		p.setBounds(230,230,340,240);
		JPanel p1=new JPanel();
		l1=new JLabel("姓名:    (符号跟数字组成)");
		l2=new JLabel("学号:    (数字组成001~999)");
		l3=new JLabel("性别:    （男或者女）");
		l4=new JLabel("所在宿舍:    （真实的宿舍）");
		t1=new JTextField();
		t2=new JTextField();
		t3=new JTextField();
		t4=new JTextField();
		p1.setLayout(new GridLayout(8,1));
		p1.add(l1);p1.add(t1);
		p1.add(l2);p1.add(t2);
		p1.add(l3);p1.add(t3);
		p1.add(l4);p1.add(t4);
		JPanel p2=new JPanel();
		b1=new JButton("提交");
		b2=new JButton("重置");
		p2.setLayout(new GridLayout(1,2));
		p2.add(b1);p2.add(b2);
		p.setLayout(new BorderLayout());
		p.add(p1,"Center");
		p.add(p2,"South");
		setLayout(new BorderLayout());
		add(p,"Center");
		this.setResizable(false);
		ConSql();
		b1.addActionListener(this);
		b2.addActionListener(this);
		setVisible(true);
	}
	public void actionPerformed(ActionEvent e) {
		if(e.getSource()==b1)
		{
			insert();
		}
		else if(e.getSource()==b2)
		{
			t1.setText("");
			t2.setText("");
			t3.setText("");
			t4.setText("");
		}
	
	}
	public void insert()
	{
		String s1=t1.getText().trim();
		String s2=t2.getText().trim();
		String s3=t3.getText().trim();
		String s4=t4.getText().trim();
		
		
		String temp="insert into student values('"+s1+"','"+s2+"','"+s3+"','"+s4+"')";
		
		
		try{
			rs=sta.executeQuery("select d_number,d_count,d_true from dormitory");
			int count=0;
			String s;
			boolean b1=false;
			while(rs.next())
			{
				s=rs.getString("d_number").trim();
				
				count=rs.getInt("d_count");
				
				System.out.println(s);
				if(s.equals(s4))
				{
					b1=true;
					if(count<4)
					{
						sta.executeUpdate(temp);
				        PreparedStatement ps=con.prepareStatement("update dormitory set d_count=? where d_number=?");
				        count++;
				       
						ps.setInt(1, count);
						ps.setString(2, ""+s4+"");
						ps.executeUpdate();
						
						this.dispose();
						new JOptionPane().showMessageDialog(null, "添加成功");
						ps.close();
						rs.close();
						sta.close();
						con.close();
						break;
					}
					else{

						
						this.dispose();
						new JOptionPane().showMessageDialog(null, "宿舍满了");
						
						rs.close();
						sta.close();
						con.close();
						break;
					}
				}
				else 
				{
					
					continue;
				}
				
			 }
			if(!b1)
			{
				this.dispose();
				new JOptionPane().showMessageDialog(null, "宿舍不存在");
			}
				
			
		}
		catch(SQLException e)
		{
			e.printStackTrace();
		}
	}
	public void ConSql()
	{
		try{
			Class.forName("com.mysql.jdbc.Driver");
			con=DriverManager.getConnection(conURL);
			sta=con.createStatement();
		}
		catch(ClassNotFoundException e){
			e.printStackTrace();
		}
		catch(SQLException e){
			e.printStackTrace();
		}
	}
}