connect Unity and MSSQL

public void Test()
    {

        Debug.Log("Connecting to database...");
        string connectionstring = @"Data Source = 127.0.0.1; 
                            user id = sa;
                            password = test;
                            Initial Catalog = test;";

        SqlConnection conn = new SqlConnection(connectionstring);
        SqlCommand cmd = new SqlCommand();
        cmd.Connection = conn;
        cmd.CommandText = "insert into Test(이름 ,아이디 , 비밀번호) values(@이름, @아이디 ,@비밀번호)";
        cmd.Parameters.AddWithValue("@이름", "name");
        cmd.Parameters.AddWithValue("@아이디", "id");
        cmd.Parameters.AddWithValue("@비밀번호", "pwd");
        try
        {
            conn.Open();
            cmd.ExecuteNonQuery();
            Debug.Log("Connected to database.");
            
        }
        catch(Exception ex)
        {
            Debug.Log(ex);
        }
        conn.Close();
    }

errorcode : System.Data.SqlClient.SqlException (0x80131904): Snix_Login (provider: SNI_PN7, error: 0 - 작업을 완료했습니다.)

I Trying to connect Unity and MSSQL What's the problem? Please Help Me