Question

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Correct INSERT .. ON DUPLICATE KEY syntax?

Which is the correct syntax to pass parameters to INSERT … ON DUPLICATE KEY UPDATE in c# ?
I tried like this

MySqlCommand cmd = new MySqlCommand("INSERT INTO table(ID,number,color) VALUES (@r,@c,@e)
ON DUPLICATE KEY UPDATE table (number) VALUES (@c,@e) ", conn);

cmd.Parameters.AddWithValue("@r", id);
cmd.Parameters.AddWithValue("@c", a_name)
cmd.Parameters.AddWithValue("@e", a_color)

cmd.ExecuteNonQuery();

But this syntax is not correct. Any ideas?

Answer 1

INSERT INTO table(ID,number) VALUES (@r,@c) ON DUPLICATE KEY UPDATE number = @c 

Therefore you should have something like:

MySqlCommand cmd = new MySqlCommand("INSERT INTO table(ID,number) VALUES (@r,@c) ON DUPLICATE KEY UPDATE number = @c ", conn);