Question

我正在使用SQlite作为数据库，并使用Java进行编码，下面提供了newID();，updateTable();和updateData();函数

public void newID(){
                String sql = "select count(*) ID from CashierDetails";
                try{
                    pst= conn.prepareStatement(sql);
                    rs = pst.executeQuery();
                    if(rs.next()){
                    int id = ((Number) rs.getObject(1)).intValue() + 1;
                    jTextField1.setText("" + id);
                    pst.close();
                    rs.close();
                    }
                }catch(Exception e){
                    JOptionPane.showMessageDialog(null, e);
                }
            }
        
public void updateTable()
            {
                String sql = "select * from CashierDetails";
                
                try{
                    
                    pst = conn.prepareStatement(sql);
                    rs = pst.executeQuery();
                    jTable5.setModel(DbUtils.resultSetToTableModel(rs));
                    pst.close();
                    rs.close();
                    
                }
                catch (Exception e)
                {
                    JOptionPane.showMessageDialog(null,e);
                }
                
                
            }
            
public void updateData ()
            {
             
                String sql = " update CashierDetails set " 
                        + " CashierName = '"+jTextField2.getText()+"',"
                        + " SecretQ = '"+jComboBox1.getSelectedItem()+"',"
                        + " Answer = '"+jTextField18.getText()+"',"
                        + " MobileNo = '"+jTextField3.getText()+"',"
                        + " Address = '"+jTextField5.getText()+"',"
                        + " Email = '"+jTextField4.getText()+"',"
                        + " Password = '"+jPasswordField1.getText()+"',"
                        + " ConfirmPass = '"+jPasswordField2.getText()+"'"
                        + " where CashierID = "+jTextField1.getText();
                
                String sql2 = "update CashierAccount set "
                        + " Username = '"+jTextField2.getText()+"',"
                        + " SecretQ = '"+jComboBox1.getSelectedItem()+"',"
                        + " Password = '"+jPasswordField1.getText()+"',"
                        + " ConfirmPassword = '"+jPasswordField2.getText()+"',"
                        + " Answer = '"+jTextField18.getText()+"'"
                        + " where CashierID = "+jTextField1.getText();
                
                
                try
                {
                    pst = conn.prepareStatement(sql);
                    pst.execute();
                    pst.close();
                    rs.close();
                    pst = conn.prepareStatement (sql2);
                    pst.execute ();
                    JOptionPane.showMessageDialog(null, "Cashier Details have been updated");
                    pst.close();
                    rs.close();
                    updateTable();
                    newID();
                    
                }
                catch (Exception e)
                {
                    e.printStackTrace();
                    JOptionPane.showMessageDialog(null, e);
                }
                
        
                        
                        
                
            }

该函数没有错误，也不会引发任何异常，它显示一个对话框，提示“收银员详细信息已更新”，但是在SQLite CashierDetails表中，CashierAccount表中的细节均未更新，以下是SqLite表 The CashierDetails Table The CashierAccount Table

现在，如果我要通过SQLite Studio填充表（即从SQLite Studio创建行并输入数据），则可以通过updateData();函数来更新该特定行

Answer 1

致电pst.executeUpdate()而不是pst.execute()

Answer 2

显然，关闭准备好的语句是一个问题。以下代码可以正常运行，并根据需要更新列表

public void updateData ()
    {
     
        String sql = " update CashierDetails set " 
                + " CashierName = '"+jTextField2.getText()+"',"
                + " SecretQ = '"+jComboBox1.getSelectedItem()+"',"
                + " Answer = '"+jTextField18.getText()+"',"
                + " MobileNo = '"+jTextField3.getText()+"',"
                + " Address = '"+jTextField5.getText()+"',"
                + " Email = '"+jTextField4.getText()+"',"
                + " Password = '"+jPasswordField1.getText()+"',"
                + " ConfirmPass = '"+jPasswordField2.getText()+"'"
                + " where CashierID = "+jTextField1.getText();
        
        String sql2 = "update CashierAccount set "
                + " Username = '"+jTextField2.getText()+"',"
                + " SecretQ = '"+jComboBox1.getSelectedItem()+"',"
                + " Password = '"+jPasswordField1.getText()+"',"
                + " ConfirmPassword = '"+jPasswordField2.getText()+"',"
                + " Answer = '"+jTextField18.getText()+"'"
                + " where CashierID = "+jTextField1.getText();
        
        
        try
        {
            pst = conn.prepareStatement(sql);
            pst.executeUpdate();
            pst.close();
            updateTable();
            pst = conn.prepareStatement (sql2);
            pst.executeUpdate();
            updateTable();
            JOptionPane.showMessageDialog(null, "Cashier Details have been updated");
            
            pst.close();
            rs.close();
        }
        catch (Exception e)
        {
            e.printStackTrace();
            JOptionPane.showMessageDialog(null, e);
        }
        

                
                
        
    }

sqlite updateData-语句不起作用

2 个答案: