Invalid attempt to access field before calling read()

Question

I have searched for a good couple hours now, looking for a solution to this problem. I am trying to get information from my database using the code below with the correct qu

Answer 1

Not sure if this is the problem in your case, but you should always check the result of Read(). eg

if (myReader.Read())
{
  statement = myReader.GetString(0);
}

Edit: Also what you are actually doing is retrieving a scalar, and as such you could use ExecuteScalar()

return (myCommand.ExecuteScalar() ?? string.Empty).ToString();
//also rename your method appropriately

Answer 2

I have just walked away from a similar issue as yours.My solution was to use a

if (!myReader.HasRows)
                {

                }

just before walking through the dataset.

while(myRead.Read()
{
 //read tuples
}

This would mean for your code:

public static string ExecuteSelect(string query)
{
//Example query is: SELECT entity_id FROM catalog_product_flat_1 WHERE 
sku='itemSku';
string statement = "";

MySqlCommand myCommand = new MySqlCommand(query, _conn);

MySqlDataReader myReader;
myReader = myCommand.ExecuteReader();
myReader.Read();
if(!myReader.HasRows)
{
 //set your statement variable to some generic value
 statement="abracadabra";
}

while(myReader.Read())
{
statement = myReader[0].ToString();
}
myReader.Close();

return statement;
}