Question

我在放置Try If TextBox1.Text = Nothing Or TextBox2.Text = Nothing Or TextBox3.Text = Nothing Or TextBox4.Text = Nothing Or TextBox5.Text = Nothing Or TextBox6.Text = Nothing Or TextBox7.Text = Nothing Or TextBox8.Text = Nothing Or ComboBox1.Text = Nothing Then MsgBox("please complete the fields!", MsgBoxStyle.Critical) Else MysqlConn.Open() command.Connection = MysqlConn command.CommandType = CommandType.Text command.CommandText = "SELECT * FROM customer WHERE email = @email" READER = command.ExecuteReader If READER.HasRows Then MsgBox("e-mail is already in use!", MsgBoxStyle.Critical) MysqlConn.Close() Else If Not READER.IsClosed Then READER.Close() End If command.Connection = MysqlConn command.CommandType = CommandType.Text command.CommandText = "INSERT INTO customer (`username`, `firstname`, `lastname`, `password`, `confirmpass`, `securityq`, `securitya`, `gender`, `email`, `contactno`) VALUES (@uname,@fname,@lname,@pword,@confirm,@secuq,@secuqa,@gender,@email,@contactno)" With command.Parameters .AddWithValue("@uname", TextBox1.Text) .AddWithValue("@fname", TextBox2.Text) .AddWithValue("@lname", TextBox3.Text) .AddWithValue("@pword", TextBox4.Text) .AddWithValue("@confirm", TextBox5.Text) .AddWithValue("@secuq", ComboBox1.SelectedItem) .AddWithValue("@secuqa", TextBox6.Text) If RadioButton1.Checked Then .AddWithValue("@gender", "male") ElseIf RadioButton2.Checked Then .AddWithValue("@gender", "female") End If .AddWithValue("@email", TextBox7.Text) .AddWithValue("@contactno", TextBox8.Text) End With command.ExecuteNonQuery() MsgBox("Registration done!", MsgBoxStyle.OkOnly) TextBox1.Clear() TextBox2.Clear() TextBox3.Clear() TextBox4.Clear() TextBox5.Clear() TextBox6.Clear() RadioButton1.Checked = False RadioButton2.Checked = False TextBox7.Clear() TextBox8.Clear() ComboBox1.ResetText() Form1.Show() Hide() MysqlConn.Close() End If End If Catch ex As mysqlException MessageBox.Show(ex.Message) Finally MysqlConn.Dispose() End Try时收到错误，但当我删除代码时

注册完成

但它没有在数据库中插入任何内容。

public static void setupUI(final View view, final Activity activity) {

    if (view instanceof ViewGroup) {
        view.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View view, MotionEvent motionEvent) {
                Utils.hideSoftKeyboard(activity, view);
                return false;
            }
        });
    }

    if (view instanceof ViewGroup) {
        for (int i = 0; i < ((ViewGroup) view).getChildCount(); i++) {
            View innerView = ((ViewGroup) view).getChildAt(i);
            setupUI(innerView, activity);
        }
    }
}

    public static void hideSoftKeyboard(Activity activity, View searchET) {
    try {
        InputMethodManager mgr = (InputMethodManager) activity.getSystemService(Context.INPUT_METHOD_SERVICE);
        mgr.hideSoftInputFromWindow(searchET.getWindowToken(), 0);
    } catch (Exception e) {
        e.printStackTrace();
    }

}

Answer 1

如果您使用相同的命令对象，则在执行另一个命令之前，您需要关闭该阅读器：

self.theLabel.text = "desiredText"
self.theLabel.addImageWith(name: "nameOfImage", behindText: false)

使用command.executenonquery时出现致命错误

1 个答案: