如何判断数据库记录是否返回空值?
我是这样写的
string mySelectQuery = "select studentid from student where name=@name";
OleDbCommand myComm = new OleDbCommand(mySelectQuery,conn);
conn.Open();
OleDbDataReader dr = myComm.ExecuteReader();
conn.Close();
if (dr.IsDBNull(0))
{
....
结果居然返回:No data exists for the row/column
怎么回事