我已加入两个表值并将这些值插入另一个表中,但插入不起作用。我正在使用Access数据库,我使用以下代码:
string query = "select t2.date,t1.FlightNo,t1.Dept_Time,t1.Arr_Time,t1.Route,t1.[Destination 1],t1.[Destination 2],t1.[Destination 3],t1.[Destination 4] From [FlightNumber]as t1 inner join [schedule]as t2 on t1.FlightNo=t2.FlightNo";
OleDbCommand cmd = new OleDbCommand(query, con);
OleDbDataAdapter adp = new OleDbDataAdapter(cmd);
dt1 = new DataTable();
adp.Fill(dt1);
con.Open();
string query2 = "Insert into Monday (date,[Flight_no],[Dept_time],[Arr_time],Route,[dest_1],dest2,dest3,dest4)values(@date,@flight,@dept,@arr,@route,@dest1,@dest2,@dest3,@dest4)";
for (int i = 0; i < dt1.Rows.Count; i++)
{
OleDbCommand cmd1 = new OleDbCommand(query2, con);
cmd.Parameters.AddWithValue("@date", SqlDbType.NVarChar).Value = dt1.Rows[i]["date"].ToString();
cmd.Parameters.AddWithValue("@flight", dt1.Rows[i]["FlightNo"]);
cmd.Parameters.AddWithValue("@dept", dt1.Rows[i]["Dept_Time"]);
cmd.Parameters.AddWithValue("@arr", dt1.Rows[i]["Arr_Time"]);
cmd.Parameters.AddWithValue("@route", dt1.Rows[i]["Route"]);
cmd.Parameters.AddWithValue("@dest1", dt1.Rows[i]["Destination 1"]);
cmd.Parameters.AddWithValue("@dest2", dt1.Rows[i]["Destination 2"]);
cmd.Parameters.AddWithValue("@dest3", dt1.Rows[i]["Destination 3"]);
cmd.Parameters.AddWithValue("@dest4", dt1.Rows[i]["Destination 4"]);
cmd1.ExecuteNonQuery();
con.Close();
MessageBox.Show("successfully inserted");
}
答案 0 :(得分:2)
DATE
是Access SQL中的reserved word,因此您需要在INSERT命令中将该列名包装在方括号中(就像使用[Flight_no],[Dept_time]等一样)
string query2 = "Insert into Monday ([date], ...
答案 1 :(得分:0)
除了Gord提到的保留字Date之外,如果你不继续重建命令和参数,你可能会在性能上更好,特别是如果你有很多想要插入的记录。相反,做一些像......
string query2 = "Insert into Monday (date,[Flight_no],[Dept_time],[Arr_time],Route,[dest_1],dest2,dest3,dest4)values(@date,@flight,@dept,@arr,@route,@dest1,@dest2,@dest3,@dest4)";
//预先构建命令和参数ONCE
OleDbCommand cmd1 = new OleDbCommand(query2,con);
cmd.Parameters.AddWithValue(“@ date”,dt1.Rows [i] [“date”]。ToString()); cmd.Parameters.AddWithValue(“@ flight”,dt1.Rows [i] [“FlightNo”]); cmd.Parameters.AddWithValue(“@ dept”,dt1.Rows [i] [“Dept_Time”]); cmd.Parameters.AddWithValue(“@ arr”,dt1.Rows [i] [“Arr_Time”]); cmd.Parameters.AddWithValue(“@ route”,dt1.Rows [i] [“Route”]); cmd.Parameters.AddWithValue(“@ dest1”,dt1.Rows [i] [“Destination 1”]); cmd.Parameters.AddWithValue(“@ dest2”,dt1.Rows [i] [“Destination 2”]); cmd.Parameters.AddWithValue(“@ dest3”,dt1.Rows [i] [“Destination 3”]); cmd.Parameters.AddWithValue(“@ dest4”,dt1.Rows [i] [“Destination 4”]);
for (int i = 0; i < dt1.Rows.Count; i++)
{
cmd.Parameters[0].Value = dt1.Rows[i]["date"].ToString();
cmd.Parameters[1].Value = dt1.Rows[i]["FlightNo"]);
cmd.Parameters[2].Value = dt1.Rows[i]["Dept_Time"]);
cmd.Parameters[3].Value = dt1.Rows[i]["Arr_Time"]);
cmd.Parameters[4].Value = dt1.Rows[i]["Route"]);
cmd.Parameters[5].Value = dt1.Rows[i]["Destination 1"]);
cmd.Parameters[6].Value = dt1.Rows[i]["Destination 2"]);
cmd.Parameters[7].Value = dt1.Rows[i]["Destination 3"]);
cmd.Parameters[8].Value = dt1.Rows[i]["Destination 4"]);
cmd1.ExecuteNonQuery();
}
con.Close();
MessageBox.Show("successfully inserted");