This parameter defaults to false. Should be true only if you intend to use a MySQL table with text fields. In this case you should use FetchForward instead of First and Next.
Description:
It executes the SQL query specified by the CommandText or PreparedQuery property and updates the FieldValues property. This is suitable for "select" queries; for other queries (like delete, update, alter), you may check ExecuteNonQuery.
Return value:
Returns -1 if the connection is not set, 0 if couldn't execute the query or 1 if succeeded.