Question

我正在尝试使用文本框将值添加到我的数据库中。

private void btnAdd_Click(object sender, EventArgs e)
{
    try
    {
        string MemberID = txtMember.Text;
        string FirstName = txtFirstName.Text;
        string LastName = txtLastName.Text;
        string Phone = txtTelephone.Text;
        string Email = txtEmail.Text;

        sql = " INSERT INTO A_Member ( MemberID, LastName, FirstName, Phone, Email) VALUES ( @Member, @LastName, @FirstName, @Phone, @Email);";
        dbCmd = new OleDbCommand(sql, dbConn);

        // Execute query
        dbCmd.ExecuteNonQuery();
    }
    catch (System.Exception exc)
    {
        MessageBox.Show(exc.Message);
        return;
    }
}

当我尝试使用添加按钮时，它表示“没有给出一个或多个参数的值。

这是我的.cs或.mdb文件中的内容吗？或者我可以改变代码的这一部分吗？

Answer 1

您已在SQL代码中正确使用了参数，但尚未将这些参数添加到命令中，例如

dbCmd.Parameters.AddWithValue("@LastName", lastNameTextBox.Text);

您必须为SQL代码中显示的每个占位符添加一个参数。

Answer 2

private void btnAdd_Click(object sender, EventArgs e)
{
    try
    {
        string memberID = txtMember.Text.Trim();
        string firstName = txtFirstName.Text.Trim();
        string lastName = txtLastName.Text.Trim();
        string phone = txtTelephone.Text.Trim();
        string email = txtEmail.Text.Trim();

        sql = "INSERT INTO A_Member ( MemberID, LastName, FirstName, Phone, Email) VALUES ( @Member, @LastName, @FirstName, @Phone, @Email);";
        dbCmd = new OleDbCommand(sql, dbConn);
        dbCmd.Parameters.Add("@MemberID",SqlDbType.Int32).Value = Convert.ToInt32(memberID);
        dbCmd.Parameters.Add("@LastName",SqlDbType.Varchar,30).Value = lastName;
        dbCmd.Parameters.Add("@FirstName",SqlDbType.Varchar,30).Value = firstName;
        dbCmd.Parameters.Add("@Phone",SqlDbType.Int32).Value = Convert.ToInt32(phone);
        dbCmd.Parameters.Add("@LastName",SqlDbType.Varchar,30).Value = email;

        // Execute query
        dbCmd.ExecuteNonQuery();
    }
    catch (System.Exception exc)
    {
        MessageBox.Show(exc.Message);
        return;
    }
}

使用文本框将值添加到sql中

2 个答案: