Question

我正在开发我的第一个Java应用程序，并且一直在尝试实现我能够实现的所有功能。以下是我的问题：

我已经实现了jTable。系统将数据从数据库加载到jTable。当我单击jTable中的一行或使用我的箭头键时，我能够将所选行中的数据加载到相应的字段，编辑和更新数据。但是，当我用新的图像替换现有图像时，我无法更新我的数据库。
假设我还在数据库中为音频和视频文件创建了列。如何将它们上传到我的数据库，进行更改并使用更改更新数据库？我可以用文字来做，但我的困难在于图像，音频和视频文件。希望像往常一样接受你的杰出贡献。

以下是我的代码：

我将以下代码附加到“保存”按钮：

btnSave.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent arg0) {

              try{

                     String sql ="Insert into Counsellee (counselleeID,firstName,surname,address,telNo,gender,counsellorID,date,photo) values (?,?,?,?,?,?,?,?,?)";

                     pst=conn.prepareStatement(sql);
                     pst.setString(1, counselleeIDField.getText());
                     pst.setString(2, firstNameField.getText());
                     pst.setString(3, surnameField.getText());
                     pst.setString(4, addressField.getText());
                     pst.setString(5, TelField.getText());
                     String value=genderComboBox.getSelectedItem().toString();
                     pst.setString(6,value);
                     pst.setString(7, counsellorIDField.getText());
                     pst.setString(8, ((JTextField)transdateChooser.getDateEditor().getUiComponent()).getText());
                     pst.setBytes(9, person_image);
                     pst.execute();

                     /*
                      * To clear input fields for the next entry
                      */
                     counselleeIDField.setText("");
                     firstNameField.setText("");
                     surnameField.setText("");
                     addressField.setText("");
                     TelField.setText("");
                     genderComboBox.setSelectedItem("");
                     counsellorIDField.setText("");
                     /*I want to return the date field to the current date and clear the image selection path for the next image, but I
                      * have no idea how to go about it. 
                      */

                      JOptionPane.showMessageDialog(null, "Saved");
                        }        

                       catch(Exception e)
                {
                       JOptionPane.showMessageDialog(null, e);

                }
                   Update_table();
                   try {
                    pst.close();
                    rs.close();
                } catch (SQLException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
        }
    });

我将以下代码附加到“更新”按钮：

btnUpdateCounsellee.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent arg0) {

            try{

                String value1= counselleeIDField.getText();
                 String value2= firstNameField.getText();
                  String value3= surnameField.getText();
                  String value4= addressField.getText();
                  String value5= TelField.getText();
                  String value6=genderComboBox.getSelectedItem().toString();
                  String value7 =counsellorIDField.getText();
                  java.util.Date value8 = transdateChooser.getDate();
                  byte[] value9 = person_image.toString().getBytes(); //something seems wrong with this line as it is not converting my image as BLOB.
                                                                      //This is where my problem is.


                  String sql="update Counsellee set counselleeID='"+value1+"' ,firstName ='"+value2+"',surname ='"+value3+"',address='"+value4+"',telNo ='"+value5+"',gender ='"+value6+"',counsellorID ='"+value7+"',date ='"+value8+"',photo ='"+value9+"' where counselleeID='"+value1+"' ";
                  pst=conn.prepareStatement(sql);
                  pst.execute();

                 /*
                  * clear input fields for next action                        
                  */
                  counselleeIDField.setText("");
                    firstNameField.setText("");
                    surnameField.setText("");
                    addressField.setText("");
                    TelField.setText("");
                    genderComboBox.setSelectedItem("");
                    //I want to set date to current date here again

                    JOptionPane.showMessageDialog(null, "Updated");

            }catch(Exception e){

            JOptionPane.showMessageDialog(null, e);


            }
            Update_table();
            try {
                pst.close();
                rs.close();
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    });

当我点击更新时，系统实际上将所有内容上传到数据库，包括图像。但是图像没有保存为BLOB，所以我无法查看它。

如何使用Java将图像，视频和音频文件上传到数据库并替换它们并更新数据库？

0 个答案: