NpgSql和PostgreSQL 12.4 -仅从数据读取器获取游标名称，而不是数据行

using Npgsql;
using System;
using System.Data;

class Program
{
    static void Main()
    {
        string connectionString = "Host=localhost;Database=mydatabase;Username=myuser;Password=mypassword;";
        using (NpgsqlConnection conn = new NpgsqlConnection(connectionString))
        {
            conn.Open();
            string sql = @"
                DECLARE mycursor CURSOR FOR SELECT * FROM mytable;
                FETCH NEXT FROM mycursor;
            ";
            using (NpgsqlCommand cmd = new NpgsqlCommand(sql, conn))
            {
                using (NpgsqlDataReader reader = cmd.ExecuteReader())
                {
                    while (reader.Read())
                    {
                        // 获取游标名称
                        string cursorName = reader.GetName(0);
                        // 获取数据行
                        for (int i = 0; i < reader.FieldCount; i++)
                        {
                            Console.Write(reader.GetValue(i) + " ");
                        }
                        Console.WriteLine();
                    }
                }
            }
        }
    }
}