Incorrect string value: '\xEF\xBF\xBD' for column

Question

I have a table I need to handle various characters. The characters include Ø, ® etc.

I have set my table to utf-8 as the default collation, all columns use table de

Answer 1

Mattmanser is right, never write a sql query by concatenating the parameters directly in the query. An example of parametrized query is:

string lastname = "Doe";
double height = 6.1;
DateTime date = new DateTime(1978,4,18);

var connection = new MySqlConnection(connStr);

try
{
    connection.Open();

    var command = new MySqlCommand(
        "SELECT * FROM tblPerson WHERE LastName = @Name AND Height > @Height AND BirthDate < @BirthDate", connection);

    command.Parameters.AddWithValue("@Name", lastname);
    command.Parameters.AddWithValue("@Height", height);
    command.Parameters.AddWithValue("@Name", birthDate);

    MySqlDataReader reader = command.ExecuteReader();
    ...
}
finally
{
    connection.Close();
}