Simple Sales Inventory System in Java

This tutorial will teach you Simple Sales Inventory System in Java and mysql.this example which will help you to learn the auto no generating using by the code.

FirstStep : we have to establish the database connection

Connection con;
    PreparedStatement pst;
    
    public void Connect()
    {
        try {
            Class.forName("com.mysql.jdbc.Driver");
            con = DriverManager.getConnection("jdbc:mysql://localhost/vmproducts","root","");
        } catch (ClassNotFoundException ex) {
            ex.printStackTrace();
        } catch (SQLException ex) {
            ex.printStackTrace();
        }   
    }

Second Step :- Create the Function getBillNo for generating the Auto ID.

public int getBillNo()
    {
         int billno = 1;
        try {
           
            Statement smt = con.createStatement();
            ResultSet rs = smt.executeQuery("select max(billno) from sales");
            rs.next();
            billno = rs.getInt(1) + 1; // increment by 1 auto ID Set
            rs.close(); 
            
        } catch (SQLException ex) {
          ex.printStackTrace();
        }
        return billno;
        
    }

After fill the productname,salesqty,customer click addbutton record will be added in to the database.

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        try {
            String billno = txtbillno.getText();
            String date = txtdate.getText();
            String pname = txtpname.getText();
            String qty = txtqty.getText();
            String customer = txtcustomer.getText();
            
            
            pst = con.prepareStatement("insert into sales(billno,salesdate,prodname,qty,customer)values(?,?,?,?,?)");
            pst.setString(1, billno);
            pst.setString(2, date);
            pst.setString(3, pname);
            pst.setString(4, qty);
            pst.setString(5, customer);
            int status = pst.executeUpdate();
            
            if(status==1)
            {
                JOptionPane.showMessageDialog(this, "Sales Completedddddd");
                txtpname.setText("");
                txtqty.setText("");
                txtcustomer.setText("");
                txtpname.requestFocus();
                txtbillno.setText(String.valueOf(getBillNo())); //after sales successfully Auto ID increment by 1
            }
            else
            {
                JOptionPane.showMessageDialog(this, "Sales Failedddd!!!");
            }
  
        } catch (SQLException ex) {
           ex.printStackTrace();
        }
        
    }