Banking Transaction Management in Java Mysql

in this tutorial will teach you Bank account to account transaction using java The set of one or more sql statements that are executed as a single unit called as transaction.the example is very useful for learning transaction jdbc.the main purpose of writing transaction if any query fails the entire transaction is rolled back.the good example is used to transfer the money from one bank account to another.if the transaction is competed the money is deducted from the first account and added to the second account.while doing the transaction error occurs both account remain unchanged. if the both query is working correctly only transaction commit other wise rollback.

Establish the Database Connection.

In this example created three different PreparedStatements

PreparedStatement pst;

PreparedStatement pst1;

PreparedStatement pst2;

public bank() {
        initComponents();
        
        Connect();
    }
    
    Connection con;
    PreparedStatement pst;
    PreparedStatement pst1;
    PreparedStatement pst2;
    ResultSet rs;
    
    public void Connect()
    {
        try {
            Class.forName("com.mysql.jdbc.Driver");
            con = DriverManager.getConnection("jdbc:mysql://localhost/sambank", "root", "");
        } catch (ClassNotFoundException ex) {
           ex.printStackTrace();
        } catch (SQLException ex) {
            ex.printStackTrace();
        }
   
    }

Paste the Code Inside the Transfer Button

try {
            String acc1 = txtacc1.getText();
            String acc2 = txtacc2.getText();
            String Account = txtamount.getText();

          Statement st1=con.createStatement( );
          
          con.setAutoCommit(false);
          
            //sender
            String SQL1="update accountholder set balance = balance-? where acc_id = ?";
            pst = con.prepareStatement(SQL1);
            pst.setString(1, Account);
            pst.setString(2, acc1);
            pst.executeUpdate();

            
            //receiver
            String SQL2="update accountholder set balance = balance+? where acc_id = ?";
            pst1 = con.prepareStatement(SQL2);
            pst1.setString(1, Account);
            pst1.setString(2, acc2);
            pst1.executeUpdate();
            
            //transer
            String SQL3="insert into transfer(f_account,to_account,amount)values(?,?,?)";
            pst2 = con.prepareStatement(SQL3);
            pst2.setString(1, acc1);
            pst2.setString(2, acc2);
            pst2.setString(3, Account);
            pst2.executeUpdate();
                
                rs.next();
                
                if(rs.getFloat(1)<0)
                {
                    con.rollback();
                    JOptionPane.showMessageDialog(this, "Transaction Failed");
                }
                else
                {
                     con.commit();
                    JOptionPane.showMessageDialog(this, "Transaction Success");
                }   

             Clear();
  
        } catch (SQLException ex) {
            JOptionPane.showMessageDialog(this, ex);
        }