Question

int p =JOptionPane.showConfirmDialog(null,"Are you sure to add this staff?","Comfirmation",JOptionPane.YES_NO_OPTION);
        if (p==0){
            String sql ="Insert into login.createstaff (Staff_ID,Staff_Name,Staff_password,Staff_Tel,Staff_position,image) values (?,?,?,?,?,?)";
            try {
                pst=conn.prepareStatement (sql);
                pst.setString(1,staffID.getText());
                pst.setString(2,staffName.getText());
                pst.setString(3,staffPassword.getText());
                pst.setString(4,staffTel.getText());
                String value =staffPosition.getSelectedItem().toString();
                pst.setString(5,value);

                pst.setBytes(6,person_image);


                pst.execute();
                JOptionPane.showMessageDialog(null, "New Staff Added");


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

大家好，这是我添加员工记录的对话框。

但是，在将其保存到数据库之前，如何设置必须插入的所有数据（无数据字段可以为空）？（我想提醒用户，如果他或她没有输入所有数据。）

数据库中的所有数据我已经设置了“not null”，但即使数据为空，我仍然可以保存记录。

Answer 1

您可以使用staffID.getText().trim().isEmpty()检查JTextField是否为空，使用JOptionPane消息对话框提醒用户。一个例子就是：

public static void main(String[] args) {
    int p = JOptionPane.showConfirmDialog(null, "Are you sure to add this staff?", "Comfirmation", JOptionPane.YES_NO_OPTION);

    if (p == 0) {
        if (staffID.getText().trim().isEmpty()) {// validate user input
            JOptionPane.showMessageDialog(null, "Please enter staff ID"); // remind user
        } else if (staffName.getText().trim().isEmpty()) {
            JOptionPane.showMessageDialog(null, "Please enter staff name");
        } else if (staffPassword.getText().trim().isEmpty()) {
            JOptionPane.showMessageDialog(null, "Please enter password");
        } else if (staffTel.getText().trim().isEmpty()) {
            JOptionPane.showMessageDialog(null, "Please enter staff telephone");
        } else {
            String sql = "Insert into login.createstaff (Staff_ID,Staff_Name,Staff_password,Staff_Tel,Staff_position,image) values (?,?,?,?,?,?)";
            try {
                pst = conn.prepareStatement(sql);
                pst.setString(1, staffID.getText());
                pst.setString(2, staffName.getText());
                pst.setString(3, staffPassword.getText());
                pst.setString(4, staffTel.getText());
                String value = staffPosition.getSelectedItem().toString();
                pst.setString(5, value);

                pst.setBytes(6, person_image);


                pst.execute();
                JOptionPane.showMessageDialog(null, "New Staff Added");


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

必须插入Java如何设置所有数据

1 个答案: