任何人都可以帮我解决我的 JAVA Swing 代码吗？

Question

我遇到这个问题已经3天了，仍然找不到更好的解决方案：

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        // TODO add your handling code here:
        labelA.setForeground(Color.black);
        labelB.setForeground(Color.black);
        jLabel3.setForeground(Color.black);
        int check=0;
        try {
            check = search(textUserId.getText(),
                textFName.getText());
        } catch (SQLException ex) {
            // Logger.getLogger(frameRegister.class.getName()).log(Level.SEVERE, null, ex);
        } catch (ClassNotFoundException ex) {
            //Logger.getLogger(frameRegister.class.getName()).log(Level.SEVERE, null, ex);
        }
        if(check==1){
            try {
                if(textPassword.getText() == null ?
                    "" == null : textPassword.getText().equals("")){
                    JOptionPane.showMessageDialog(null,
                        "First Name and Last must contain value","System Message",
                        JOptionPane.INFORMATION_MESSAGE);
                    textUserAddress.setText(null);
                    textUserId.setText(null);
                    textFName.setText(null);
                    textLName.setText(null);
                    textAge.setText(null);
                    textUBirth.setText(null);
                    textContactNum.setText(null);
                    textPassword.setText(null);
                    textEmailAdd.setText(null);
                    textMaritalStatus.setText(null);
                    textUserOccupation.setText(null);
                    jLabel3.setForeground(Color.red);
                }
                if((textUserId.getText() == null ? "" == null :
                    textUserId.getText().equals("")) ||
                (textFName.getText() == null ? "" == null :
                    textFName.getText().equals(""))){
                JOptionPane.showMessageDialog(null,
                    "ID and Name is Required","System Message",
                    JOptionPane.ERROR_MESSAGE);
                labelB.setForeground(Color.red);
                labelA.setForeground(Color.red);
            }
            else{
                st.executeUpdate("Insert into info("
                    + "id,firstname,lastname,age,dateofbirth,marital_status,address,occupation,contact_no,email_add,"
                    + "password" + ") VALUES ('"
                    + textUserId.getText() + "','"
                    + textFName.getText() + "','"
                    + textLName.getText() + "','"
                    + textAge.getText() + "','"
                    + textUBirth.getText() + "','"
                    + textMaritalStatus.getText() + "','"
                    + textUserAddress.getText() + "','"
                    + textUserOccupation.getText() + "','"
                    + textContactNum.getText() + "','"
                    + textPassword.getText() + "')");
   

                JOptionPane.showMessageDialog(null, "Record Created",
                    "System Message",JOptionPane.INFORMATION_MESSAGE);
                frameMain.this.setVisible(false);
                textUserId.setText("");
                frameMain fm= new frameMain();
                fm.show();
               
            }
        } catch (SQLException ex) {
            // Logger.getLogger(frameMain.class.getName()).log(Level.SEVERE, null, ex);
            JOptionPane.showMessageDialog(null,
                "Record Already Exist","System Message",
                JOptionPane.ERROR_MESSAGE);
            textUserAddress.setText(null);
            textUserId.setText(null);
            textFName.setText(null);
            textLName.setText(null);
            textAge.setText(null);
            textUBirth.setText(null);
            textContactNum.setText(null);
            textLName.setText(null);
            textPassword.setText(null);
            textMaritalStatus.setText(null);
            textUserOccupation.setText(null);
            textEmailAdd.setText(null);

        }

        }
    }

我的问题是单击“已保存”按钮后，它会显示“记录已存在”，而实际上它并不存在

我期待我会得到负面和积极的影响，但我希望有人能帮助我

Answer 1

调整后的代码：

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
    labelA.setForeground(Color.black);
    labelB.setForeground(Color.black);
    jLabel3.setForeground(Color.black);
    int check = 0;
    try {
        check = search(textUserId.getText(), textFName.getText());
    } catch (SQLException ex) {
        ex.printStackTrace();
    } catch (ClassNotFoundException ex) {
        ex.printStackTrace();
    }

    if (check == 1) {
        try {
            // Use .equals for string comparison instead of ==
            if (textPassword.getText() == null || textPassword.getText().isEmpty()) {
                JOptionPane.showMessageDialog(null, "First Name and Last must contain value", "System Message", JOptionPane.INFORMATION_MESSAGE);
                clearTextFields();
                jLabel3.setForeground(Color.red);
                return; // Exit the method if validation fails
            }

            if (textUserId.getText() == null || textUserId.getText().isEmpty() || textFName.getText() == null || textFName.getText().isEmpty()) {
                JOptionPane.showMessageDialog(null, "ID and Name is Required", "System Message", JOptionPane.ERROR_MESSAGE);
                labelB.setForeground(Color.red);
                labelA.setForeground(Color.red);
                return;
            }

            // Use PreparedStatement for SQL queries to prevent SQL injection
            st.executeUpdate("INSERT INTO info (id, firstname, lastname, age, dateofbirth, marital_status, address, occupation, contact_no, email_add, password) VALUES ('"
                    + textUserId.getText() + "', '"
                    + textFName.getText() + "', '"
                    + textLName.getText() + "', '"
                    + textAge.getText() + "', '"
                    + textUBirth.getText() + "', '"
                    + textMaritalStatus.getText() + "', '"
                    + textUserAddress.getText() + "', '"
                    + textUserOccupation.getText() + "', '"
                    + textContactNum.getText() + "', '"
                    + textEmailAdd.getText() + "', '"
                    + textPassword.getText() + "')");

            JOptionPane.showMessageDialog(null, "Record Created", "System Message", JOptionPane.INFORMATION_MESSAGE);
            this.setVisible(false);
            clearTextFields();
            frameMain fm = new frameMain();
            // Use setVisible(true) instead of show() since show() is deprecated.
            fm.setVisible(true); 

        } catch (SQLException ex) {
            ex.printStackTrace(); // Log SQL Exception details
            JOptionPane.showMessageDialog(null, "Record Already Exist", "System Message", JOptionPane.ERROR_MESSAGE);
            clearTextFields();
        }
    }
}

private void clearTextFields() {
    textUserAddress.setText("");
    textUserId.setText("");
    textFName.setText("");
    textLName.setText("");
    textAge.setText("");
    textUBirth.setText("");
    textContactNum.setText("");
    textLName.setText("");
    textPassword.setText("");
    textMaritalStatus.setText("");
    textUserOccupation.setText("");
    textEmailAdd.setText("");
}