Question

我想在PageLoad＆amp ;;上从SQLServer中选择值ex（Date，Time ....）。在许多标签中显示他们。我尝试这个代码，但在所有标签显示时间。我想在所有标签中显示所有值而不是一个值。请帮帮我。

string strquery =“从Event_SingleReservation中选择Time，Date，SeatPrice，EventName”; SqlConnection connection2 = DBConnection.getConnection（）; connection2.Open（）; SqlCommand cmd2 = new SqlCommand（）; cmd2.Connection = connection2; cmd2.CommandText = strquery;

    string eventname = cmd2.ExecuteScalar().ToString();
    lbl1_EventName.Text = eventname;



    string eventdate = cmd2.ExecuteScalar().ToString();
    lbl2_EventDate.Text = eventdate;

    string eventtime = cmd2.ExecuteScalar().ToString();
    lbl3_EventTime.Text = eventtime;

    string seatprice = cmd2.ExecuteScalar().ToString();
    lbl_seatpriceshow.Text = seatprice;

Answer 1

ExecuteScalar（）仅从第一列中选择一个值 - 即对select Time,Date,SeatPrice,EventName from Event_SingleReservation使用它将仅返回 Time ，这是第一列。

要选择所有值，您应该使用ExecuteReader（）

SqlDataReader reader = cmd2.ExecuteReader();
if (reader.Read())
{
    lbl1_EventName.Text = reader[0];
    lbl3_EventDate.Text = reader[1];
    ...
}

请参阅What is the difference between ExecuteScalar, ExecuteReader and ExecuteNonQuery?

在From SQLServer＆amp;中选择值。在ASP的标签中显示

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