Question

我正在尝试使用Asp.Net将数据插入MYSQL数据库但是我收到以下错误消息：由于System.InvalidOperationsException而无法连接到数据库。连接必须有效并且打开。这就是我在做的事情：

protected void SU_Button_Click(object sender, EventArgs e)
        {
            string connectionString = @"Data Source=mno; Database=xyz; User ID=abc; Password=abc";
            using (MySqlConnection connection = new MySqlConnection(connectionString))
            {
                try
                {
                    string insertData = "insert into signup_table(firstname,surname,mobile_number,email_address,password," +
                                        "confirm_password) values (@F_Name, @S_Name, @M_Number, @E_Address, @Password, @C_Password)";
                    MySqlCommand command = new MySqlCommand(insertData, connection);

                    command.Parameters.AddWithValue("@F_Name",FN_TextBox.Text);
                    command.Parameters.AddWithValue("@S_Name", SN_TextBox.Text);
                    command.Parameters.AddWithValue("@M_Number", MN_TextBox.Text);
                    command.Parameters.AddWithValue("@E_Address", EA_TextBox.Text);
                    command.Parameters.AddWithValue("@Password", P_TextBox.Text);
                    command.Parameters.AddWithValue("@C_Password", CP_TextBox.Text);
                    int result = command.ExecuteNonQuery();
                    connection.Open();
                    MessageBox.Show("Connected to database");
                    MessageBox.Show("Data inserted successfully");
                }
                catch(Exception ex)
                {
                    MessageBox.Show("Failed to connect to database due to" + ex.ToString());
                    MessageBox.Show("Failed to insert data due to" + ex.ToString());
                }

            }
        }

请提出建议。在此先感谢... :)

Answer 1

您必须在执行查询之前打开连接。

    connection.Open();
    int result = command.ExecuteNonQuery();

完成后也不要忘记关闭你的连接。

Answer 2

更改此

 int result = command.ExecuteNonQuery();
 connection.Open();

到这个

  connection.Open();
  int result = command.ExecuteNonQuery();

如何使用Asp.net将数据插入MySQL数据库

2 个答案: