在使用中获得此代码更新日期时间的Fileds PARAMS访问如何运行查询使用参数
SQL = "update ConfTbl set D_from = @MyFrom , D_to = @MyTo where Code = " + Convert.ToInt32(TmpCode1) + "";
OleDbCommand Cmd = Conn.CreateCommand();
OleDbParameter dateparam1 = Cmd.Parameters.AddWithValue("@MyFrom", DbType.DateTime);
dateparam1.Value = dt_From.Value;
OleDbParameter dateparam2 = Cmd.Parameters.AddWithValue("@MyTo", DbType.DateTime);
dateparam2.Value = dt_To.Value;
Cmd.CommandText = SQL;
Cmd.ExecuteNonQuery();
如何改变这种对运行查询两个日期之间找到?
财产以后这样的:select * from ConfTbl where Tdate >= #MyFrom# and Tdate <= #MyTo#
我试试这个:
SQL = @"select * from ReturnConfTbl where Tdate >= @MyFrom and Tdate <= @MyTo";
OleDbCommand Cmd = Conn.CreateCommand();
OleDbParameter dateparam1 = Cmd.Parameters.AddWithValue("@MyFrom", DbType.DateTime);
dateparam1.Value = dt_from_A.Value;
OleDbParameter dateparam2 = Cmd.Parameters.AddWithValue("@MyTo", DbType.DateTime);
dateparam2.Value = dt_to_A.Value;
Cmd.CommandText = SQL;
Cmd.ExecuteNonQuery();
adp = new OleDbDataAdapter(SQL, Conn);
adp.Fill(dsView, "ReturnConfTbl");
adp.Dispose();
this.dataGridView3.DataSource = dsView.Tables[0].DefaultView;
,并得到这个错误:Data type mismatch in criteria expression
。
这是一个非常直接的变化。你能提供一些你没有用过的代码吗? –
是否因为你的参数是DBNull.Value? – hoodaticus