Question

该程序是一个商店，您可以在其中添加带照片的项目，您可以更新，搜索，删除，添加等，我可以搜索，删除和添加但不能编辑我的项目。它一直说它有一个错误的SQL语法，我不知道该怎么做。请帮助。

private void btn_browseActionPerformed(java.awt.event.ActionEvent evt) {                                           
    fileChooser.setCurrentDirectory(new File(System.getProperty("user.home")));
    FileNameExtensionFilter filter = new FileNameExtensionFilter("*.IMAGE", "jpg", "gif", "png");
    fileChooser.addChoosableFileFilter(filter);
    result = fileChooser.showSaveDialog(null);
    if (result == JFileChooser.APPROVE_OPTION) {
        File selectedFile = fileChooser.getSelectedFile();
        String path = selectedFile.getAbsolutePath();
        label_photo.setIcon(ResizeImage(path));
        s = path;
        tf = "true";
    } else if (result == JFileChooser.CANCEL_OPTION) {
        System.out.println("No Data");
        tf = "false";
    } else {
        tf = "false";
    }
}

我的sql语法有错误，它有什么问题吗？

public void update() {
   try {
        Class.forName("com.mysql.jdbc.Driver");  // MySQL database connection
        Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/cake_ordering_system?" + "user=root&password=");
        PreparedStatement pstmt = null;

        pstmt = conn.prepareStatement("update cake set cake_name=?,cake_description=?,cake_price=?,cake_photo=? where cake_name='" + tf_search + "'");
        InputStream is = new FileInputStream(new File(s));

        //cake_name
        pstmt.setString(1, tf_name.getText());
        //cake_description*/
        pstmt.setString(2, ta_dc.getText());
        //cake_price
        pstmt.setString(3, tf_price.getText());
        //cake_photo
        pstmt.setBinaryStream(4, is);
        //execute the query
        pstmt.executeUpdate();

        JOptionPane.showMessageDialog(null, "Successfully updated a new record!");
    } catch (Exception e) {
        JOptionPane.showMessageDialog(null, e);
    }
}

Answer 1

我编写了这段代码来更新PostgreSQL数据库中的图像。

        private void updateImage(int id, File tempImagem) throws Exception {
    try {
        FileInputStream fis = new FileInputStream(tempImagem);
        PreparedStatement pstm = super.operaConn.getConnDst().getConexao().prepareStatement("UPDATE table SET image = ? WHERE id = ?");

        byte[] imagemArray = new byte[(int) tempImagem.length()];
        DataInputStream imagemStream = new DataInputStream(new FileInputStream(tempImagem));
        imagemStream.readFully(imagemArray);
        imagemStream.close();

        pstm.setBytes(1, imagemArray);
        pstm.setInt(2, id);
        pstm.executeUpdate();
        pstm.close();
        fis.close();
    } catch (Exception e) {
        throw new Exception("ERRO no metodo updateImagem()", e);
    }
}

工作正常！

无法更新我的项目，图像BLOB格式[JAVA]

1 个答案: