java GUI连接数据库实现增删改查

java GUI连接数据库实现增删改查

页面效果

1.封装连接数据库的代码

package com.itheima.sql;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

import javax.swing.JOptionPane;

public class DAO {
	private static DAO dao=new DAO();
	public  DAO() {
		try {
			Class.forName("com.mysql.jdbc.Driver");
		} catch (Exception e) {
			// TODO: handle exception
			JOptionPane.showMessageDialog(null, "数据库加载失败"+e.getMessage());
		}
	}
	public static Connection getConn()
	{
		try {
			Connection conn=null;
			String url="jdbc:mysql://localhost:3306/shop?&characterEncoding=utf-8";   //127.0.0.1:3306
			conn=DriverManager.getConnection(url,"root","root");
			return conn;
		} catch (Exception e) {
			// TODO: handle exception
			JOptionPane.showMessageDialog(null, "数据库连接失败"+e.getMessage());
			return null;
		}
	}
}

2.建立使用属性的set,get方法

package com.itheima.goods;

public class Goods {
    private int sid=0;  //商品编号
    private String sname=null;  //商品名字
    private double inprice=0;    //商品进价
    private double outprice=0;    //商品卖价
    private int save=0;			//商品库存
    private String note="";   //商品备注
    private String state="";   //商品状态 上架不上架
    public int  getSid() {
		return sid;
	}
	public void setSid(int sid) {
		this.sid = sid;
	}
	public String getSname() {
		return sname;
	}
	public void setSname(String sname) {
		this.sname = sname;
	}
	public double getInprice() {
		return inprice;
	}
	public void setInprice(double inprice) {
		this.inprice = inprice;
	}
	public double getOutprice() {
		return outprice;
	}
	public void setOutprice(double outprice) {
		this.outprice = outprice;
	}
	public int getSave() {
		return save;
	}
	public void setSave(int save) {
		this.save = save;
	}
	public String getNote() {
		return note;
	}
	public void setNote(String note) {
		this.note = note;
	}
	public String getState() {
		return state;
	}
	public void setState(String state) {
		this.state = state;
	}
	
}

3.GUI页面的实现

package com.itheima.goods
public class Shangpin extends JFrame {
		JLabel j11=new JLabel("货号           ");
		JLabel j12=new JLabel("商品名         ");
		JLabel j13=new JLabel("进价              ");
		JLabel j14=new JLabel("售价                ");//表头
		JLabel j15=new JLabel("库存               ");
		JLabel j16=new JLabel("状态             ");
		JLabel j17=new JLabel("备注 ");
		JPanel jp2=new JPanel();  //表头
		JLabel j1=new JLabel("货号");
		JLabel j2=new JLabel("商品名字");
		JLabel j3=new JLabel("进价");
		JLabel j4=new JLabel("售价");
		JLabel j5=new JLabel("库存");
		JLabel j6=new JLabel("状态");
		JLabel j7=new JLabel("备注");
		JTextField f1=new JTextField(4);
		JTextField f2=new JTextField(10);
		JTextField f3=new JTextField(6);
		JTextField f4=new JTextField(6);
		JTextField f5=new JTextField(6);
		JTextField f6=new JTextField(4);
		JTextField f7=new JTextField(10);
		JButton b1=new JButton("查询");
		JButton b2=new JButton("修改");
		JButton b3=new JButton("删除");
		JButton b4=new JButton("清空");
		JButton b5=new JButton("添加");
		
		final JTable t1=new JTable();
		public  Shangpin() {
			
			this.setTitle("商品管理模块");
			this.setLayout(null);
			this.setLocation(300,100 );
			this.setSize(850,600 );
			this.setLayout(null);
			JPanel panel=new JPanel();
			JPanel panel2=new JPanel();
			panel.add(t1);
			panel.setBounds(10, 130,800, 1000);
			jp2.setBounds(0, 100, 800, 100); //表头
			this.add(panel);
			final Vector<String> title=new Vector<String>();
			title.add("货物号");
			title.add("货物名");
			title.add("进价");
			title.add("售价");
			title.add("库存");
			title.add("商品状态");
			title.add("备注");
			Vector value=Goodsmanage.query();
			final DefaultTableModel model=new DefaultTableModel(value,title);
			t1.setModel(model);
			if(t1.getRowCount()>0)
			{
				t1.setRowSelectionInterval(0, 0);
			}
				t1.addMouseListener(new MouseListener() {
					@Override
					public void mouseReleased(MouseEvent e) {
					}
					@Override
					public void mousePressed(MouseEvent e) {
						// TODO 自动生成的方法存根		
					}
					@Override
					public void mouseExited(MouseEvent e) {
						// TODO 自动生成的方法存根
					}
					@Override
					public void mouseEntered(MouseEvent e) {
						// TODO 自动生成的方法存根
					}
					@Override
					public void mouseClicked(MouseEvent e) {
						// TODO 自动生成的方法存根
					int row=t1.getSelectedRow();
					String sid=t1.getValueAt(row, 0).toString();
					String sname=t1.getValueAt(row, 1).toString();
					String inprice=t1.getValueAt(row, 2).toString();
					String ouprice=t1.getValueAt(row, 3).toString();
					String save=t1.getValueAt(row, 4).toString();
					String state=t1.getValueAt(row, 5).toString();
					String note=t1.getValueAt(row, 6).toString();
					f1.setText(sid);
					f2.setText(sname);
					f3.setText(inprice);
					f4.setText(ouprice);
					f5.setText(save);
					f6.setText(state);
					f7.setText(note);
					}
				});
			b2.addActionListener(new ActionListener() {
				@Override
				public void actionPerformed(ActionEvent e) {
					// TODO 自动生成的方法存根
					int sid=Integer.valueOf(f1.getText().trim());
					String sname=f2.getText().trim();
					double inprice=Double.valueOf(f3.getText().trim());
					double outprice=Double.valueOf(f4.getText().trim());
					int save=Integer.valueOf(f5.getText().trim());
					String state=f6.getText().trim();
					String note=f7.getText().trim();
					Goods good=new Goods();
					good.setSid(sid);
					good.setSname(sname);
					good.setInprice(inprice);
					good.setOutprice(outprice);
					good.setSave(save);
					good.setState(state);
					good.setNote(note);
					Goodsmanage.update(good);
					Vector value=Goodsmanage.query();
					final DefaultTableModel model=new DefaultTableModel(value,title);
					t1.setModel(model);
				}
			});
			b3.addActionListener(new ActionListener() {
				
				@Override
				public void actionPerformed(ActionEvent e) {
					// TODO 自动生成的方法存根
					int sid=Integer.valueOf(f1.getText().trim());
					Goods good=new Goods();
					Goodsmanage.delete(sid);
					Vector value=Goodsmanage.query();
					final DefaultTableModel model=new DefaultTableModel(value,title);
					t1.setModel(model);
				}
			});
			b4.addActionListener(new ActionListener() {
				
				@Override
				public void actionPerformed(ActionEvent e) {
					// TODO 自动生成的方法存根
					f1.setText("");
					f2.setText("");
					f3.setText("");
					f4.setText("");
					f5.setText("");
					f6.setText("");
					f7.setText("");
				}
			});
			b5.addActionListener(new ActionListener() {
				
				@Override
				public void actionPerformed(ActionEvent e) {
					// TODO 自动生成的方法存根
					int sid=Integer.valueOf(f1.getText().trim());
					String sname=f2.getText().trim();
					double inprice=Double.valueOf(f3.getText().trim());
					double outprice=Double.valueOf(f4.getText().trim());
					int save=Integer.valueOf(f5.getText().trim());
					String state=f6.getText().trim();
					String note=f7.getText().trim();
					Goods good=new Goods();
					good.setSid(sid);
					good.setSname(sname);
					good.setInprice(inprice);
					good.setOutprice(outprice);
					good.setSave(save);
					good.setState(state);
					good.setNote(note);
					Goodsmanage.insert(good);
					Vector value=Goodsmanage.query();
					final DefaultTableModel model=new DefaultTableModel(value,title);
					t1.setModel(model);
					
				}
			});
			jp2.add(j11);   //第一个表头
			jp2.add(j12);
			jp2.add(j13);
			jp2.add(j14);  
			jp2.add(j15);
			jp2.add(j16);
			jp2.add(j17);
			this.add(jp2); 
			panel2.setBounds(0,20,840,100);
			panel2.add(j1);
			panel2.add(f1);
			panel2.add(j2);
			panel2.add(f2);
			panel2.add(j3);
			panel2.add(f3);
			panel2.add(j4);
			panel2.add(f4);
			panel2.add(j5);
			panel2.add(f5);
			panel2.add(j6);
			panel2.add(f6);
			panel2.add(j7);
			panel2.add(f7);
			panel2.add(b2);
			panel2.add(b3);
			panel2.add(b4);
			panel2.add(b5);
			this.setResizable(false); //设置不可以变大
			this.add(panel2);
			this.setVisible(true);
		}
}

4.实现赠删改查

package com.itheima.goods;
public class Goodsmanage {
      public static void insert(Goods g)
      {
    	  try {
			Connection conn=DAO.getConn();  //数据库连接
			PreparedStatement ps=conn.prepareStatement("insert into goods(sid,sname,inprice,outprice,save,state,note)values(?,?,?,?,?,?,?)");
			ps.setInt(1, g.getSid());
			ps.setString(2, g.getSname());
			ps.setDouble(3, g.getInprice());
			ps.setDouble(4, g.getOutprice());
			ps.setInt(5, g.getSave());
			ps.setString(6, g.getState());
			ps.setString(7, g.getNote());
			int f=ps.executeUpdate();
			if(f>0)
			{
				JOptionPane.showMessageDialog(null, "成功插入数据");
			}
			else
			{
				JOptionPane.showMessageDialog(null, "没有成功插入数据");
			}
			ps.close();
			conn.close();
			
		} catch (Exception e) {
			// TODO: handle exception
			JOptionPane.showMessageDialog(null, "注意需要不能重复");
		}
      }
      public static void update(Goods g)
      {
    	  try {
			Connection con=DAO.getConn();
			PreparedStatement ps=con.prepareStatement("update goods set sid=?,sname=?,inprice=?,outprice=?,save=?,state=?,note=? where sid=?");
			ps.setInt(1, g.getSid());
			ps.setString(2, g.getSname());
			ps.setDouble(3, g.getInprice());
			ps.setDouble(4, g.getOutprice());
			ps.setInt(5, g.getSave());
			ps.setString(6, g.getState());
			ps.setString(7, g.getNote());
			ps.setInt(8, g.getSid());
			int f=ps.executeUpdate();
			System.out.println(f);
			if(f>0)
			{
				JOptionPane.showMessageDialog(null, "成功更新数据");
			}
			else
			{
				JOptionPane.showMessageDialog(null, "没有完美的更新数据");
			}
			ps.close();
			con.close();
    	  } catch (Exception e) {
			// TODO: handle exception
    		  JOptionPane.showMessageDialog(null, "没有成功更新数据");
		}
      }
      public static void update(int sale,int sid)
      {
    	  try {
			Connection con=DAO.getConn();
			PreparedStatement ps=con.prepareStatement("update goods set save=save-? where sid=?");
			ps.setInt(1, sale);
			ps.setInt(2, sid);
			int f=ps.executeUpdate();
			System.out.println(f);
			if(f>0)
			{
				JOptionPane.showMessageDialog(null, "成功更新数据");
			}
			else
			{
				JOptionPane.showMessageDialog(null, "没有完美的更新数据");
			}
			ps.close();
			con.close();
    	  } catch (Exception e) {
			// TODO: handle exception
    		  JOptionPane.showMessageDialog(null, "没有成功更新数据");
		}
      }
      public static void delete(int sid)
      {
    	  try {
			Connection conn=DAO.getConn();
			PreparedStatement ps=conn.prepareStatement("delete from goods where sid=?");
			ps.setInt(1,sid);
			int f=ps.executeUpdate();
			if(f>0)
			{
				JOptionPane.showMessageDialog(null, "成功删除数据");
			}
			else
			{
				JOptionPane.showMessageDialog(null, "没有删除数据");
			}
			ps.close();
			conn.close();
		} catch (Exception e) {
			// TODO: handle exception
			JOptionPane.showMessageDialog(null, "连接失败");
		}
      }
      public static Vector query()
      {
    	  try {
			Vector vector=new Vector();
			Connection conn=DAO.getConn();
			PreparedStatement ps=conn.prepareStatement("select * from goods ");
			ResultSet rs=ps.executeQuery();
			while(rs.next()&&rs.getRow()>0)
			{
				Vector row=new Vector();
				for(int col=1;col<=rs.getMetaData().getColumnCount();col++)
				{
					if(col==3||col==4)
					{
						row.add(String.valueOf(rs.getDouble(col)));
					}
					else if(col==5||col==1)
					{
						row.add(String.valueOf(rs.getInt(col)));
					}
					else
					{
						row.add(String.valueOf(rs.getString(col)));
					}
				}
				vector.add(row);
			}
			return vector;
		} catch (Exception e) {
			// TODO: handle exception
			JOptionPane.showMessageDialog(null, "查询失败");
			e.printStackTrace();
			return null;
		}
      }
}

注释：点击商品进行删除和修改！